Supei SITE BREAK OTHER

Prepared for

The Somersworth Site Group Somersworth Sanitary Landfill Superfund Site

Somersworth New Hampshire

DRAFT

OPERATION AND MAINTENANCE PLAN FOR PREFERRED REMEDIAL ACTION AT THE

SOMERSWORTH SANITARY LANDFILL SUPERFUND SITE

Prepared by

GEOSYNTEC CONSULTANTS 130 Research Lane Suite 2

Guelph Ontario N1G 5G3 and

1100 Lake Hearn Drive NE Suite 200 Atlanta Georgia 30342-1523

GeoSyntec Project Number TR005746 30 April 2004

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

DISCLAIMER

This document is a DRAFT document prepared by the Work Settling Defendants under a government Consent Decree This document has not undergone formal review by the US Environmental Protection Agency or the New Hampshire Department of Environmental Services The opinions findings and conclusions expressed are those of the author and not those of the US Environmental Protection Agency or the New Hampshire Department of Environmental Services

NOTE

This report has been printed on recycled paper containing at least 30 post-consumer content

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OPERATION AND MAINTENANCE PLAN

Prepared by Thomas Krug MSc PEng Project Director GeoSyntec Consultants Inc

Prepared by Michael Monteleone MSc PE Engineer-in-Charge GeoSyntec Consultants Inc

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TABLE OF CONTENTS Page

1 INTRODUCTION 1

11 Summary of Site Characteristics 1

2 PREFERRED REMEDIAL ACTION DESCRIPTION 4

21 Preferred Source Control Remedy 4

22 Management of Migration Remedy 5

23 Institutional Controls 5

231 Fencing and Other Physical Barriers 6

232 Groundwater and Land Use Restrictions 6

233 Access 6

24 Groundwater Monitoring 6

25 Landfill Gas Venting Trench 7

3 PREFERRED SOURCE CONTROL REMEDY - OPERATION AND MAINTENANCE 8

31 Evaluating Performance and Effectiveness of the CTW 8

311 Groundwater Sampling 8

312 Hydraulic Testing - Evaluating Flow Around Beneath the CTW 8

313 Contingency Plan 9

32 Permeable Landfill Cover 10

321 Permeable Landfill Cover System Inspection 10

322 Access Road Inspection 11

323 Reporting 11

324 MaintenanceContingency Activities 12

4 MANAGEMENT OF MIGRATION REMEDY - OPERATION AND MAINTENANCE 14

41 Groundwater Extraction System 14

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42 Groundwater Injection System 15

43 Security Measures 15

5 INSTITUTIONAL CONTROLS OPERATION AND MAINTENANCE 16

51 Contingency Plan 16

6 GROUNDWATER MONITORING NETWORK OPERATION AND MAINTENANCE 17

61 Monitoring Well Network Inspection and Maintenance 17

62 Well Abandonment 17

7 LANDFILL GAS MIGRATION CONTROL SYSTEM - OPERATION AND MAINTENANCE 18

71 Landfill Gas Monitoring 18

72 Maintenance of Vent Stacks 18

73 Contingency Plan 18

8 OPERATIONAL SAFETY PLAN 20

9 REFERENCES 21

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LIST OF TABLES

Table 1 Summary of Operation and Maintenance Activities Table 2 Abandoned Monitoring Well Inventory

LIST OF FIGURES

Figure 1 General Site Location Figure 2 Site Layout and Monitoring Network

LIST OF APPENDICES

Appendix A Correspondence Regarding Institutional Controls Appendix B Site Inspection Forms

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LIST OF ABBREVIATIONS

CD Consent Decree CE chlorinated ethene CTW Chemical Treatment Wall DCA dichloroethane DCE dichloroethene EPA United States Environmental Protection Agency ft feet GMZ Groundwater Management Zone ICL Interim Cleanup Levels NHDES New Hampshire Department of Environmental Services OampM Operation and Maintenance PCB polychlorinated biphenyls PCE tetrachloroethene PLC permeable landfill cover POC point of compliance ppb parts per billion PRA Preferred Remedial Action PRB permeable reactive barrier RA Remedial Action RD Remedial Design ROD Record of Decision SAP Sampling and Analysis Plan SOW Statement of Work TCE trichloroethene ugL micrograms per liter VC vinyl chloride VOC volatile organic compound ZVI zero-valent iron

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1 INTRODUCTION

This Operation and Maintenance Plan (OampM Plan) for the Preferred Remedial Action (PRA) at the Somersworth Sanitary Landfill Superfund Site (the Site) has been prepared by GeoSyntec Consultants Inc (GeoSyntec) on behalf of the City of Somersworth and General Electric Company the Work Settling Defendants (WSDs) for the Site This draft OampM Plan covers operation and maintenance issues with the Chemical Treatment Wall (CTW) permeable cover and bedrock groundwater extractions components of the PRA This OampM Plan also covers operation and maintenance issues with the landfill gas (LFG) venting trench installed in 2003 on the east side of the Site This OampM Plan is submitted to the United States Environmental Protection Agency (EPA) and New Hampshire Department of Environmental Services (NHDES) to fulfill the requirements of the Consent Decree (CD) (EPA 1995) for Remedial Design (RD) and Remedial Action (RA) to prepare and submit for review and approval an OampM Plan to ensure the long-term continued effectiveness of each component of the PRA The OampM Plan requirements are listed in Section VI (A)(3) of Appendix B of the CD

11 Summary of Site Characteristics

The Site is located on the north side of Blackwater Road approximately one mile southwest of the center of the City of Somersworth (the City) in Strafford County New Hampshire as shown in Figure 1 The Site layout is shown in Figure 2 The dominant Site feature is a former sanitary landfill that extends over an area of approximately 26 acres The extent of the property currently owned by the City at and around the landfill is shown on Figure 1

This section presents a summary of site history and conditions that was developed using information contained in the Record of Decision (ROD) for the Site (EPA 1994) and in the Design Investigation Report for the Pilot Study that was submitted to the EPA and NHDES as part of the RD activities (Beak 1998)

The landfill accepted municipal and industrial wastes from the mid-1930s to 1981 Initially the wastes were burned but in 1958 the burning was stopped and the wastes were landfilled after excavating the natural soils Soils were used to cover the wastes daily and the landfill expanded westward The approximate extent of buried landfill wastes is shown on Figure 2 Approximately 10 acres of the eastern portion of the Site

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have been reclaimed by the City for use as recreational facilities tennis and basketball courts ball fields and a playground Residential properties are present to the east west and south of the Site and a wooded area and former quarry are located to the north A National Guard Armory and fire station are also located to the east of the Site A cemetery is located to the northeast of the Site

The landfill is located entirely within the Peters Marsh Brook surface water drainage basin The brook flows northwesterly through the wetlands at the Site into Tates Brook which in turn flows into the Salmon Falls River which is located about one mile east of the Site (see Figure 1)

The Site is relatively flat and low lying (see Figure 2) except that the quarrying activities immediately to the north of the landfill have resulted in the presence of a 15 to 20-foot vertical escarpment which runs parallel to the northern edge of the waste The western edge of the waste slopes gently downward toward the wetland

The Site is underlain by an unconfined sand and gravel aquifer ranging from about 15 to 75 feet thick Metamorphic bedrock occurs beneath the sand and gravel overburden deposits A peat layer is present at ground surface in and near the wetland Groundwater flows through the overburden in a northwesterly direction The bedrock is fractured with flow in the shallow bedrock appearing to be slightly north of west Groundwater from both the bedrock and overburden discharges to Peters Marsh Brook and the wetland

Groundwater sampling conducted at the Site during the Remedial Investigation and Feasibility Study (RIFS) between 1985 and 1992 indicated the presence of low concentrations (parts per billion to about a part per million) of the following VOCs

bull trichloroethene (also know as trichloroethylene TCE) bull tetrachloroethene (also known as tetrachloroethylene or perchloroethylene

PCE) bull 11 -dichloroethene (11 -DCE) bull cis and trans isomers of 12-dichloroethene (cis-l2-DCE and trans-12-DCE

respectively) bull 12-dichloroethane (12-DCA) bull vinyl chloride (VC) bull benzene and

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bull methylene chloride (also known as dichloromethane)

Metals (specifically chromium and arsenic) were detected in the groundwater samples during the RIFS but their concentrations were similar to background levels Polychlorinated biphenyls (PCBs) and pesticides were not detected in the groundwater samples Soils sampled during the RIFS had low concentrations of VOCs and semi-volatile organic compounds VOCs were detected in sediment and surface water samples from the wetland in 1985 and 1986 no VOCs were detected during subsequent sampling of the surface water in 1992 (sediments were not re-sampled)

The ROD reports that the groundwater VOC distribution downgradient of the buried waste appears to have reached a steady-state condition and that VOCs extended to approximately 1700 feet downgradient of the waste at the time of the RIFS Groundwater sampling conducted during RD indicates that by 1998 the extent and overall concentration of VOCs in groundwater was significantly less than this (about 1200 feet downgradient of the waste) and that significant natural attenuation of the VOCs in groundwater was occurring (Beak 1998) More recent sampling (GeoSyntec 2003) provides additional evidence that natural attenuation is ongoing

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2 PREFERRED REMEDIAL ACTION DESCRIPTION

The Preferred Remedial Action (PRA) for the Site is described in detail in the 100 Design (Beak and GeoSyntec 1999) that was approved by EPA and NHDES in April 1999 An update to the design was prepared in July 2000 (GeoSyntec 2000) In summary the PRA is comprised of

1) a Preferred Source Control Remedy (including a CTW and permeable landfill cover PLC)

2) a Management of Migration Remedy 3) Institutional Controls and 4) a Groundwater Monitoring Program

The PRA described in the Consent Decree does not include a landfill gas (LFG) venting trench but based on soil gas monitoring conducted in 2001 and 2002 the EPA and NHDES believed that actions such as the LFG venting trench were necessary to mitigate methane in landfill gas near the perimeter of the landfill A LFG venting trench was installed at the Site in 2003 The components of the PRA and the LFG venting trench are described in the following subsections

21 Preferred Source Control Remedy

The Preferred Source Control Remedy includes installation of a CTW to provide in-situ flow-through treatment of groundwater containing chlorinated ethenes (CEs) at the downgradient edge of the waste management area of the landfill The CTW was constructed during the summer of 2000 at the location shown in Figure 2 The construction of the CTW is described in the Draft Work in Progress Chemical Treatment Wall Construction Completion Report (GeoSyntec 2001b) The CTW must prevent all untreated overburden groundwater that contains CEs at concentrations greater than Interim Cleanup Levels (ICLs) from migrating from the landfill to areas beyond the Point of Compliance (POC) except for insubstantial amounts of such groundwater The POC is the edge of the waste management area except where the CTW has been constructed in which case it is the outer edge of the CTW The groundwater passing through the CTW must achieve ICLs for the CEs within 18 months after the Preferred Remedial Action Prefmal Inspection Meeting and must maintain such levels thereafter

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The Preferred Source Control Remedy also includes placement of a permeable landfill cover (PLC) and additional source control measures to remediate benzene and methylene chloride in groundwater migrating from the landfill if necessary The PLC covers the portion of the landfill not currently used for recreational activities The PLC consists of approximately six inches of coarse backfill material and six inches of topsoil seeded with native grass The purpose of the PLC is to prevent direct contact with the underlying waste material allow for infiltration of precipitation through the landfill and control erosion

The Preferred Source Control Remedy must also assure that groundwater migrating from the landfill to areas beyond the POC does not contain gtICL concentrations of benzene or methylene chloride 18 months after CTW construction No additional source control measures have been identified as necessary for implementation at the Site given their absence or very low concentrations in groundwater (Beak and GeoSyntec 1999) however the Groundwater Monitoring Plan (Sampling and Analysis Plan (SAP) GeoSyntec 200la) has been developed to collect the data to address this compliance requirement

22 Management of Migration Remedy

The Management of Migration Remedy is required to reduce the concentrations of VOCs in groundwater to ICLs at and beyond the POC It includes bedrock groundwater pumping at extraction well BRW-1 located adjacent to bedrock monitoring well B-12R (located approximately 80 feet south of the edge of the waste) and natural attenuation of VOCs in groundwater downgradient of the CTW Extracted bedrock groundwater is discharged to the infiltration gallery located on the landfill upgradient of the CTW and treated by the CTW The need for additional bedrock groundwater extraction must be evaluated as part of the PRA implementation

23 Institutional Controls

The PRA also includes institutional controls The 100 Design includes fencing other physical barriers and access controls and land and groundwater use restrictions

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231 Fencing and Other Physical Barriers

Fencing and other physical barriers have been installed around active and accessible components of the PRA to discourage vandalism and tampering and provide protection to the components as listed below

bull An 8-foot high chain link fence has been installed around the control box and the underground vault for the extraction system The infiltration gallery and extraction well have been protected by flushmount locking protective covers

bull Protective steel casings have been installed over all monitoring wells and will be locked using heavy gauge padlocks (ie to withstand unauthorized access using bolt cutters)

bull Dense shrubs will be planted around the soil gas vent pipes of the LFG venting system

232 Groundwater and Land Use Restrictions

The City of Somersworth has notified all owners of property within the GMZ of the groundwater use restrictions (see correspondence from the City contained in Appendix A)

233 Access

Where access to land is required for monitoring remedy construction or other response actions necessary land easements or access agreements will be used to the extent necessary and possible An easement has been obtained for extraction well BRW-1 Existing agreements obtained from the property owners to access existing wells are being used during RA

24 Groundwater Monitoring

The Groundwater Monitoring Plan is provided in Section 2 of the SAP to address the monitoring requirements identified in the Statement of Work (SOW) appended to the CD The groundwater monitoring network is shown in Figure 2

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231 Fencing and Other Physical Barriers

Fencing and other physical barriers have been installed around active and accessible components of the PRA to discourage vandalism and tampering and provide protection to the components as listed below

bull An 8-foot high chain link fence has been installed around the control box and the underground vault for the extraction system The infiltration gallery and extraction well have been protected by flushmount locking protective covers

bull Protective steel casings have been installed over all monitoring wells and will be locked using heavy gauge padlocks (ie to withstand unauthorized access using bolt cutters)

bull Dense shrubs will be planted around the soil gas vent pipes of the LFG venting system

232 Groundwater and Land Use Restrictions

The City of Somersworth has notified all owners of property within the GMZ of the groundwater use restrictions (see correspondence from the City contained in Appendix A)

233 Access

Where access to land is required for monitoring remedy construction or other response actions necessary land easements or access agreements will be used to the extent necessary and possible An easement has been obtained for extraction well BRW-1 Existing agreements obtained from the property owners to access existing wells are being used during RA

24 Groundwater Monitoring

The Groundwater Monitoring Plan is provided in Section 2 of the SAP to address the monitoring requirements identified in the Statement of Work (SOW) appended to the CD The groundwater monitoring network is shown in Figure 2

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25 Landfill Gas Venting Trench

The PRA described in the Consent Decree does not include a landfill gas (LFG) venting trench but based on soil gas monitoring conducted in 2001 and 2002 the EPA and NHDES believe that certain actions such a LFG venting trench are necessary to mitigate methane in landfill gas near the perimeter of the landfill A LFG venting trench was installed along the southern and eastern perimeter of the landfill as shown in Figure 2 during 2003 The LFG venting trench is a passive system that prevents landfill gas from moving away from the landfill and allows for methane gas to escape from the subsurface

The LFG venting trench includes two segments of a gravel filled trench with vertical vent pipes to the surface at regular intervals The passive LFG venting system relies upon advective flow of LFG generated in the landfill and barometric pumping to convey LFG into the gravel filled trench and out through vertical vent pipes to the atmosphere The venting trench also serves as a barrier to soil gas migration through the use of a geomembrane liner which prevents LFG from migrating past the venting trench and force the LFG out the vent pipes The locations of the two segments of trench are shown in Figure 2

The soil gas venting trench extends down to the seasonal low groundwater level The trench is 3 feet wide with a total depth between approximately 15 feet in the southern segment to approximately 27 feet in the northern segment

The venting trench contains gravel (57 stone) placed from the seasonal low groundwater table to a depth of 3 feet below ground surface A vertical geomembrane extends down the outside wall of the trench (the wall located farthest from the landfill) to act as a barrier to soil gas migration Above the gravel a geotextile fabric separator a 25 feet layer of compacted clay and a 05 foot layer of topsoil have been installed The compacted clay is intended to limit infiltration of surface water while the geotextile separator prevents migration of sediment into the gravel filled portion of the trench

The vent pipes are embedded vertically within the gravel and are 4 inches in diameter The pipe in the gravel is slotted with 18-inch slots The vent pipes extend 8 feet above ground surface and terminate with a wind driven turbine vent at the outlet

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3 PREFERRED SOURCE CONTROL REMEDY - OPERATION AND MAINTENANCE

The CTW is a passive treatment system that has no regular short-term OampM requirements Maintenance actions may be required in the future if monitoring shows that precipitation or fouling of the iron has occurred The PLC has been designed to be effective for the duration of CTW operation and to allow precipitation to infiltrate the landfill to assist in flushing VOCs from the waste management area Maintenance actions for the PLC are described in Section 32 Table 1 presents a summary of the maintenance activities to be conducted as part of the PRA at the Site

31 Evaluating Performance and Effectiveness of the CTW

A program for evaluating the effectiveness of the CTW is part of the requirements for the OampM Plan described in requirement 3(b) of the CD Details of the monitoring program are presented in the SAP (GeoSyntec 2001 a) A summary of the monitoring to be conducted is presented below

311 Ground water S ampling

Groundwater samples will be collected from monitoring wells installed in the iron for analysis of inorganic constituents and biomass These parameters will be used to identify the nature of permeability changes if any within the CTW

312 Hydraulic Testing - Evaluating Flow Around Beneath the CTW

Decreases in the hydraulic conductivity of the iron andor water table mounding upgradient of the CTW could potentially indicate that inorganic precipitation or biofouling of the CTW are affecting its permeability Regular hydraulic testing of monitoring wells installed within the iron of the CTW and water level measurements at wells upgradient of the CTW as described in the SAP (GeoSyntec 200la) will provide the data required to assess these conditions Additional monitoring was conducted to evaluate the performance of suspect panels of the CTW The monitoring conducted is described in a letter from GeoSyntec to the EPA dated 29 October 2001 (GeoSyntec 200 Ic)

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3 PREFERRED SOURCE CONTROL REMEDY - OPERATION AND MAINTENANCE

The CTW is a passive treatment system that has no regular short-term OampM requirements Maintenance actions may be required in the future if monitoring shows that precipitation or fouling of the iron has occurred The PLC has been designed to be effective for the duration of CTW operation and to allow precipitation to infiltrate the landfill to assist in flushing VOCs from the waste management area Maintenance actions for the PLC are described in Section 32 Table 1 presents a summary of the maintenance activities to be conducted as part of the PRA at the Site

31 Evaluating Performance and Effectiveness of the CTW

A program for evaluating the effectiveness of the CTW is part of the requirements for the OampM Plan described in requirement 3(b) of the CD Details of the monitoring program are presented in the SAP (GeoSyntec 2001 a) A summary of the monitoring to be conducted is presented below

311 Ground water S ampling

Groundwater samples will be collected from monitoring wells installed in the iron for analysis of inorganic constituents and biomass These parameters will be used to identify the nature of permeability changes if any within the CTW

312 Hydraulic Testing - Evaluating Flow Around Beneath the CTW

Decreases in the hydraulic conductivity of the iron andor water table mounding upgradient of the CTW could potentially indicate that inorganic precipitation or biofouling of the CTW are affecting its permeability Regular hydraulic testing of monitoring wells installed within the iron of the CTW and water level measurements at wells upgradient of the CTW as described in the SAP (GeoSyntec 200la) will provide the data required to assess these conditions Additional monitoring was conducted to evaluate the performance of suspect panels of the CTW The monitoring conducted is described in a letter from GeoSyntec to the EPA dated 29 October 2001 (GeoSyntec 200 Ic)

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313 Contingency Plan

If the monitoring described in the SAP indicates that the Performance Standards for the CTW (Section 131 of the SAP) elements of this contingency plan presented in the 100 Design may be implemented as appropriate to improve the performance of the CTW This contingency plans includes an initial response of considering additional monitoring to further evaluate the non-performance and identify appropriate further actions Potential problems with the performance of the CTW and possible contingency actions are listed below

bull Incomplete degradation of CEs as they pass through CTW - If incomplete degradation of CEs within the CTW is observed additional iron may be installed in the CTW This may be implemented by constructing another CTW parallel to and downgradient or upgradient of the existing CTW in those areas needing additional treatment

bull Foulingplugging of the CTW - If plugging or fouling of the CTW is observed during routine monitoring events it is possible that physical mixing or disturbance (eg augering) will be used within or at the edges of the CTW to breakup the precipitate or biomass that may be present To date no such maintenance actions have been required at any sites where the reactive iron CTW technology has been installed

bull Mounding of groundwater upgradient of the CTW (and diverted groundwater flow) - If significant mounding of groundwater is observed on the upgradient side of the CTW and substantial amounts of groundwater are diverted around the CTW at any time during monitoring of the performance of the CTW it is possible that impermeable funnel sections will be installed extending in a direction upgradient from the two ends of the CTW to prevent flow around CTW

bull Potential changes in the source concentrations of CEs- If the concentrations of CEs in groundwater flowing into the CTW increase significantly resulting in incomplete degradation of the CEs as they pass through the CTW is occurring then additional iron may be installed as described above

The VOCs in the area south of the landfill (ie at wells FS-1 FS-2 B-13) require special consideration to address concerns raised by EPA in their October 1998 letter (EPA 1998) This area is downgradient from the area of well B-12R (ie transgradient

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to the landfill waste) VOCs in overburden groundwater in this area do not appear to be the result of transport through the overburden groundwater from the landfill but instead are believed to be the result of discharging bedrock groundwater The only VOCs present at gtICL concentrations in the overburden in this area are TCE and VC (since 1996 up to 16 ugL and 19 ugL respectively) Monitoring of both the groundwater flow directions (through water level monitoring and gradient analysis) and groundwater VOC concentrations will be conducted in this area to evaluate the effects of operating the CTW and the Management of Migration Remedy (see Section 40) Should this monitoring indicate that overburden VOC concentrations are increasing with time then the monitoring frequency in this area will be increased to verify the concentration trends If the increasing concentrations are verified then additional remedial actions will be evaluated for potential implementation Such actions may include natural attenuation additional groundwater extraction or expansion of the CTW

32 Permeable Landfill Cover

321 Permeable Landfill Cover System Inspection

The objective of the inspections of the permeable soil cover system inspection is to detect problems or conditions that would prevent the Permeable Landfill Cover (PLC) from continuing to prevent direct contact with the underlying waste material allow for infiltration reduce erosion and promote drainage During these inspections the PLC will be visually examined for the following

bull evidence of subsidence or settling

bull evidence of burrowing animals

bull presence of any erosion rills

bull siltation of wetland or fioodplains

bull seepage of any liquids

bull condition of vegetation

bull presence of woody plants

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bull obstruction of the drain ditch system

bull evidence of improper drainage or drainage system obstruction

bull condition of ditch lining materials and

bull any other irregularities

Inspections of the PLC will be performed by staff from GeoSyntec or the City of Somersworth on a quarterly basis

322 Access Road Inspection

The objective of the access road inspection is to detect any observable problem or condition that would prevent the roads from providing safe and adequate access to the PLC The access road will be visually inspected for the following

bull condition of access road

bull evidence of unauthorized access

bull evidence of burrowing animals

bull presence of foreign objects on-site and

bull other visually discernable irregularities

323 Reporting

After each inspection an inspection report including a summary of the inspection will be completed This report will include a list of any problems identified as a part of the inspection program and a photographic record of site conditions

The information gathered during each inspection will be legibly recorded in an inspection checklist Completed checklists will be compiled in the Annual Monitoring

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and Demonstration of Compliance Report Data to be included as a part of each monitoring report should include the following

bull name and location of project

bull date time and weather conditions during inspection

bull name(s) of personnel on-site

bull list of facilities inspected and

bull any relevant observations and photographs of areas of concerninterest

The form to be used during the site inspection is included in Appendix B and includes a place for all observations general comments and a photographic log

324 MaintenanceContingency Activities

Erosion rills spotted during PLC inspections will be repaired by packing straw mulch into the void areas This will prevent further erosion and allow the cap vegetation to take root in the area stabilizing the rill If rills reach 4 to 6 in in depth additional soil material will be added and the area will be recompacted reseeded fertilized and mulched Materials equivalent to those already in place will be used

At the onset of the third growing season a high-quality agricultural fertilizer will be applied at the rates suggested by the manufacturer If growth of seed tops is dense and the vegetation is matted down or large woody plants are present the cap will be mowed Mowing will be completed at least twice each year to inhibit the establishment of large woody plants and maintain vegetation between 3 and 6 inches in height

Problems detected during the routine inspections of the site may require repair not included with regular maintenance activities These additional maintenance activities may contain the following

bull trap and remove burrowing animals

bull visually check and repair of animal burrows

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bull regrade access road and place new stone as needed

bull paint well casings and replace locks

bull repair gaps in the fence

bull repair damage to PLC cover

bull repair or placement of ditch lining materials as needed and

bull replace or repair any other damaged items

Animal burrows will be checked by carefully digging through cover soil layer to allow inspection The burrow hole will be immediately filled and seeded to prevent creation of erosion rills

All maintenance activities which are completed will be documented in the Annual Monitoring and Demonstration of Compliance Report Information on maintenance activities will include the following

bull name and location of project

bull date time and weather conditions during site visit

bull names of personnel on-site

bull activities completed and

bull any other relevant information

After each maintenance activity a summary of the maintenance activities completed along with appropriate photographs will be prepared and included as a part of the inspection report Copies of each of the quarterly inspection reports will be sent to the EPA and NHDES in the Annual Monitoring and Demonstration of Compliance Report

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4 MANAGEMENT OF MIGRATION REMEDY - OPERATION AND MAINTENANCE

This section presents the normal operating procedures for the bedrock extraction and re-injection system operating at the Site

41 Groundwater Extraction System

The groundwater extraction system consists of the following

1) a 6-inch diameter groundwater extraction well located on the south side of Blackwater Road (BRW-1)

2) a groundwater extraction well pump located in well BRW-1 3) two level switches in the extraction well to indicate the level of

groundwater in the extraction well and control the operation of the groundwater extraction well pump

4) a manual flow control valve to control the flowrate of groundwater from the extraction well pump located in the vault control cabinet on the north side of Blackwater Road

5) a flowmeter totalizer to monitor the flow from the extraction well pump located in the vault with displays on the Instrument Control Panel (TCP) located in the vault control cabinet adjacent to the vault

6) pump controls enclosed in an above ground control cabinet located beside the underground vault and

7) underground double walled piping to transfer water from the extraction well beneath Blackwater Road to the underground vault

The pump is equipped with an ONOFFAUTO switch and in the AUTO mode will operate if the level of groundwater in the well is above the low level switch If the pump shuts off because the groundwater level falls below the low level switch the pump will restart when the groundwater level increases above the high level switch

The extraction well will normally be operated on a continuous basis The flow from the extraction well will be adjusted to the desired flow rate (initially about 10 to 12 gallons per minute [gpm]) using the flow control valve An operating log sheet will be used to record the instantaneous and the total flow from the extraction well by the City

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on a regular basis Monthly inspections will be performed by the City to confirm that the pump is operating and that the integrity of the piping system is being maintained The flow meter on the pump discharge can be viewed from outside the underground vault and the flow control valve can be adjusted from outside the underground vault

The bedrock groundwater extraction pump will require regular maintenance (at least semi-annually) to inspect the pump intake and remove any material that may foul the pump intake This maintenance will be conducted by GeoSyntec or the City The connection between the groundwater extraction well pump and transfer piping is made with a pitless adaptor that allows for removal of the pump from the well for inspection or maintenance from the ground surface

42 Groundwater Injection System

The groundwater injection system consists of

1) double-walled underground piping to convey groundwater from the underground vault up the hill to the infiltration gallery

2) perforated distribution piping in the infiltration gallery 3) an infiltration gallery filled with stone to allow groundwater to percolate into

the landfill and 4) a clean-out access point to allow access to distribution piping in the

infiltration gallery

The infiltration gallery will require regular maintenance to remove material that may foul the distribution manifold It is recommended that the piping accessible from the clean out point be inspected by GeoSyntec and cleaned if necessary at least once per year

43 Security Measures

The pump controls are installed in a lockable above ground control box The control box and the underground vault with the flow control valve and flowmeter are surrounded by an 8-foot high chain link fence The bedrock extraction well and infiltration gallery have flushmount locking covers The covers will be locked with heavy gauge padlocks to withstand unauthorized access using bolt cutters

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5 INSTITUTIONAL CONTROLS OPERATION AND MAINTENANCE

Regular (quarterly) inspection of the fences pump and control houses for extraction well BRW-1 and the well protective casings will be conducted and corrective measures implemented as necessary to maintain the integrity of these physical barriers In addition the City will review building permit applications for property within the GMZ (Figure 2) to insure that new land use activities are consistent with the institutional controls put in place by the City The City will also perform an annual review of New Hampshire state water well records to identify any new wells that may have been installed within the GMZ

51 Contingency Plan

Possible problems with implementing the Institutional Controls and actions to be taken are listed below

bull If groundwater use not compliance with the Citys restrictions on the use of groundwater in the GMZ is observed legal action will be taken as required to enforce the Citys ordinances

bull If ownership of land in the vicinity of the Site is transferred to another party the City will re-negotiate access agreements as necessary

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6 GROUND WATER MONITORING NETWORK OPERATION AND MAINTENANCE

This section describes the inspection and maintenance activities that will be conducted on the monitoring well network and the plans for abandonment of monitoring wells as required

61 Monitoring Well Network Inspection and Maintenance

Regular inspections of the monitoring network will be conducted and corrective measures implemented as necessary to ensure that the monitoring network remains operational as required by Env-Ws 410 Wells will be visually inspected for maintenance purposes during the regular water level measurement events (three times a year for the first three years) The inspections will include visual inspection of the lock protective casing surface seal cap and well casing to identify any potential security or integrity problems as well as inspection for frost heave settlement and other indications that the elevation of the well top may have changed Records of inspections and maintenance activities will be retained with the field forms

Monitoring wells and surface completions will be repaired or replace as needed Well tops will be re-surveyed if there is indication that the elevation has changed significantly enough to affect the hydraulic analysis (ie gt2 inches near the CTW and gt6 inches further from the CTW) If vandalism of above ground components of the monitoring well network is persistent fencing may be installed around select wells

62 Well Abandonment

All monitoring wells at the Site that are not to be monitored as part of the Groundwater Monitoring Plan have been or will be abandoned in accordance with state regulatory requirements (Env-Ws 41031 and We 604) Table 2 identifies the wells at the Site that will be or have been abandoned as part of the Groundwater Monitoring Plan implementation process The wells have been abandoned by a drilling contractor licensed in the state of New Hampshire under RSA 482-B and Env-Ws 41031(b) using the procedures provided in the SAP (see Section 62)

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7 LANDFILL GAS MIGRATION CONTROL SYSTEM - OPERATION AND MAINTENANCE

This section presents the monitoring and operating procedures for the LFG venting trench (the landfill gas migration control system) at the Site

71 Landfill Gas Monitoring

Landfill gas monitoring will be conducted to confirm that the LFG venting system is performing as intended Samples of gas from soil gas probes located in the vicinity of the LFG trench will be collected and analyzed with field screening equipment for 1) methane (CH4) 2) carbon dioxide (COa) 3) oxygen (62) 4) hydrogen sulfide (HaS) and total volatile organic compounds (VOCs) Monitoring will be conducted on a quarterly basis for two years following installation of the LFG trench then on a semishyannual basis for two additional years Requirements for monitoring if any after four years will be determined based on the data collected during the first four years of system operation

72 Maintenance of Vent Stacks

The vent stacks of the LFG venting system will require periodic inspection and maintenance to ensure that the vents remain free of debris or other obstructions that might inhibit the flow of LFG from the vent stacks The vent stacks will be inspected on a quarterly basis for two years following installation of the LFG trench then on a semi-annual basis (in the spring and in the fall) Debris and other obstruction will be removed as required following the inspections

73 Contingency Plan

If the monitoring described in Section 71 indicates that the performance objectives for the LFG venting system are not being achieved elements of this contingency plan will be implemented as appropriate to enhance the performance of the LFG venting system This contingency plans includes an initial response of considering additional monitoring to further evaluate the non-performance and identify appropriate further actions If the concentrations of methane in soil gas on the side away from the landfill remain elevated then the passive LFG trench may be converted to an active venting system The existing vertical vent pipes would capped and connected

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to a buried header pipe with valves to regulate and balance gas flow Two blowers one for each segment of venting trench would be connected to the header pipe to extract soil gas The blower for the northeast trench would be located northwest of the northern end of the trench close to the tree line The blower for the southeast trench would be located to the west of the trench near the existing pumping well fenced area and near a stand of trees

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8 OPERATIONAL SAFETY PLAN

A Site Health and Safety Plan (HASP) was developed for investigation activities at the Site (GeoSyntec 2002) This HASP describes appropriate health and safety procedures for investigation activities being conducted at the Site Monitoring activities at described in this OampM Plan should be conducted following the procedures presented in this HASP or a comparable HASP adopted by the organization conducting the work

Any time that the extraction well pump is to be removed from the extraction well it is necessary to follow a lock-out-tag-out procedure to prevent another individual from turning on the pump while it is removed from the extraction well Prior to removing the pump the maintenance staff must shut off the power to the pump and install a key lock on the power supply to prevent another individual from operating the pump When maintenance activities have been completed the lock can be removed from the power supply by the maintenance staff that installed the lock This same procedure must be followed when maintenance staff prepares to open up the clean out of the infiltration gallery to prevent someone from operating the extraction well pump and pumping water up to the clean out point

The subsurface vault component of the bedrock groundwater extraction system is a confined space Normal operation of the system does not require entry into the vault but maintenance activities may require entry Maintenance activities will be conducted by personnel from the City of Somersworth who will follow Health and Safety protocols established by the City for entry into subsurface confined space

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9 REFERENCES

Beak International Incorporated (Beak) 1996 Remedial Design for Preferred Remedial Action at the Somersworth Sanitary Landfill Superfund Site New Hampshire Health and Safety Plan February 1996

Beak International Incorporated (Beak) 1998 Design Investigation Report for the Pilot Study and Site Groundwater Monitoring Program Remedial Design for Preferred Remedial Action at the Somersworth Sanitary Landfill Superfund Site New Hampshire Draft Report July 1998

Beak International Incorporated and GeoSyntec Consultants International Inc (Beak and GeoSyntec) 1999 Preferred Remedial Action 100 Design and Demonstration of Compliance Plan Somersworth Sanitary Landfill Superfund Site New Hampshire Final Report 23 April 1999

GeoSyntec Consultants International Inc (GeoSyntec) 2000 100 Design Update 1 Preferred Remedial Action 100 Design and Demonstration of Compliance Plan Somersworth Sanitary Landfill Superfund Site New Hampshire 17 July 2000

GeoSyntec Consultants International Inc (GeoSyntec) 200la Sampling and Analysis Plan (SAP) for Groundwater Monitoring During Preferred Remedial Action Part 1 of 2 Field Sampling Plan 19 March 2001

GeoSyntec Consultants International Inc (GeoSyntec) 200Ib Chemical Treatment Wall Construction Completion Report Draft Work in Progress 30 May 2001

GeoSyntec Consultants International Inc (GeoSyntec) 200Ic Letter to Roger Duwart of EPA Re Updated Proposal for Monitoring of Suspect Panels of the Chemical Treatment Wall at the Somersworth Sanitary Landfill Superfund Site New Hampshire 29 October 2001

GeoSyntec Consultants International Inc (GeoSyntec) 2002 Somersworth Sanitary Landfill Superfund Site Health and Safety Plan April 2002

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GeoSyntec Consultants International Inc (GeoSyntec) 2003 Annual Monitoring and Demonstration of Compliance Report for 2002 DRAFT 31 January 2003

United States Environmental Protection Agency New England (Region I) (EPA) 1994 Record of Decision Somersworth Sanitary Landfill Superfund Site

United States Environmental Protection Agency New England (Region I) (EPA) 1995 Consent Decree for Remedial DesignRemedial Action at the Somersworth Sanitary Landfill Superfund Site Somersworth New Hampshire

United States Environmental Protection Agency (EPA) 1998 Letter to Mr Norman G Leclerc City Engineer Dated October 21 1998

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Table 1 Summary of Operation and Maintenance Activities

Somersworth Sanitary Landfill Superfund Site Somersworth New Hampshire

Activity Conducted by

in 2004 Ql Q2

Record Extraction Well Pump Flow

Inspect Pumping Vault

City GeoSyntec

City GeoSyntec

X X

X

X X

X

X

X

X X

X

X X

X

X

X

Complete Site Inspection (Appendix B) GeoSyntec X X

Monitor Soil Gas Probes and Vent Stacks for Methane GeoSyntec X X

Pull and Inspect Extraction Pump GeoSyntec X

Inspect Infiltration Gallery Cleanout GeoSyntec X

Conduct Ground water Monitoring GeoSyntec X

Q3 Q4

X X X X X X

X X

X X X X X X

X X

X X

X X

X

X X

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Table 2 Abandoned Monitoring Well Inventory

Somersworth Sanitary Landfill Superfund Site Somersworth New Hampshire

Monitoring Point Description Property Comments B-10L Monitoring Well City Abandoned on 42701

B-10WT Monitoring Well City Abandoned on 42701

B-11L Monitoring Well Private Abandoned on 7800 B-11R Monitoring Well Private Abandoned on 7800 B-13L Monitoring Well Private Abandoned on 8800 B-1L Monitoring Well City Abandoned on 42701 B-3L Monitoring Well City Abandoned on 4800 B-4L Monitoring Well Private Abandoned in 800 B-5L Monitoring Well Armory Abandoned on 7800 B-5R Monitoring Well Armory Abandoned on 7800 B-5U Monitoring Well Armory Abandoned on 7800 B-6L Monitoring Well City Abandoned on 5101 B-7L Monitoring Well Private Abandoned on 42701 B-7R Monitoring Well Private Abandoned on 42701 B-8U Monitoring Well City Abandoned on 42701

B-8WT Monitoring Well City Abandoned on 5101 B-9L Monitoring Well City Abandoned on 5101

B-9WT Monitoring Well City Abandoned on 5101 FS-10 Monitoring Well City Abandoned on 7800 FS-13 Monitoring Well City Abandoned on 9800 FS-14 Monitoring Well City Abandoned on 9800 FS-3 Monitoring Well City Abandoned on 4800 FS-5 Monitoring Well City Abandoned on 7800 FS-6 Monitoring Well City Abandoned on 5101 FS-8 Monitoring Well City Abandoned on 7800 FS-9 Monitoring Well City Abandoned on 0501 and reinstalled as FS-9A

MW-2 Monitoring Well City Abandoned on 9800 MW-4 Monitoring Well City Abandoned in 800 OB-1 Monitoring Well City Abandoned on 5101

OB-17R Monitoring Well City Abandoned on 5101 OB-18U Monitoring Well Private Well Scheduled to be Abandoned - not easily accessible due to high water OB-19U Monitoring Well Private Well Scheduled to be Abandoned - not easily accessible due to high water

OB-2 Monitoring Well City Abandoned on 5101 OB-20U Monitoring Well Private Well Scheduled to be Abandoned - not easily accessible due to high water OB-21R Monitoring Well City Abandoned on 0501 and reinstalled as OB-21RA

OB-3 Monitoring Well City Abandoned on 5101 OB-8R Monitoring Well Private Abandoned on 8800 P-10 Monitoring Well City Abandoned on 8800 P-ll Monitoring Well City Abandoned on 8800 P-12 Monitoring Well City Abandoned on 5101 P-13 Monitoring Well Private Abandoned on 5101 P-14 Monitoring Well City Abandoned on 8800

PS-2R Monitoring Well City Abandoned on 4800 PW-1 Monitoring Well City Abandoned on 5101

Notes All wells that have been abandoned were abandoned by a state-licensed drilling contractor in accordance with the procedure provided in Specification 2080 of the 100 Design (Beak and GeoSyntec 1999)

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Table 2 Abandoned Monitoring Well Inventory

Somersworth Sanitary Landfill Superfund Site Somersworth New Hampshire

Monitoring Point Description Property Comments B-10L Monitoring Well City Abandoned on 42701

B-10WT Monitoring Well City Abandoned on 42701

B-11L Monitoring Well Private Abandoned on 7800 B-11R Monitoring Well Private Abandoned on 7800 B-13L Monitoring Well Private Abandoned on 8800 B-1L Monitoring Well City Abandoned on 42701 B-3L Monitoring Well City Abandoned on 4800 B-4L Monitoring Well Private Abandoned in 800 B-5L Monitoring Well Armory Abandoned on 7800 B-5R Monitoring Well Armory Abandoned on 7800 B-5U Monitoring Well Armory Abandoned on 7800 B-6L Monitoring Well City Abandoned on 5101 B-7L Monitoring Well Private Abandoned on 42701 B-7R Monitoring Well Private Abandoned on 42701 B-8U Monitoring Well City Abandoned on 42701

B-8WT Monitoring Well City Abandoned on 5101 B-9L Monitoring Well City Abandoned on 5101

B-9WT Monitoring Well City Abandoned on 5101 FS-10 Monitoring Well City Abandoned on 7800 FS-13 Monitoring Well City Abandoned on 9800 FS-14 Monitoring Well City Abandoned on 9800 FS-3 Monitoring Well City Abandoned on 4800 FS-5 Monitoring Well City Abandoned on 7800 FS-6 Monitoring Well City Abandoned on 5101 FS-8 Monitoring Well City Abandoned on 7800 FS-9 Monitoring Well City Abandoned on 0501 and reinstalled as FS-9A

MW-2 Monitoring Well City Abandoned on 9800 MW-4 Monitoring Well City Abandoned in 800 OB-1 Monitoring Well City Abandoned on 5101

OB-17R Monitoring Well City Abandoned on 5101 OB-18U Monitoring Well Private Well Scheduled to be Abandoned - not easily accessible due to high water OB-19U Monitoring Well Private Well Scheduled to be Abandoned - not easily accessible due to high water

OB-2 Monitoring Well City Abandoned on 5101 OB-20U Monitoring Well Private Well Scheduled to be Abandoned - not easily accessible due to high water OB-21R Monitoring Well City Abandoned on 0501 and reinstalled as OB-21RA

OB-3 Monitoring Well City Abandoned on 5101 OB-8R Monitoring Well Private Abandoned on 8800 P-10 Monitoring Well City Abandoned on 8800 P-ll Monitoring Well City Abandoned on 8800 P-12 Monitoring Well City Abandoned on 5101 P-13 Monitoring Well Private Abandoned on 5101 P-14 Monitoring Well City Abandoned on 8800

PS-2R Monitoring Well City Abandoned on 4800 PW-1 Monitoring Well City Abandoned on 5101

Notes All wells that have been abandoned were abandoned by a state-licensed drilling contractor in accordance with the procedure provided in Specification 2080 of the 100 Design (Beak and GeoSyntec 1999)

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City of Somersworth

Somersworth Sanitary | Landfill Superfund Site

Site Location Map Somersworth Landfill Superfund Site Somersworth NH

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APPENDIX A

CORRESPONDENCE REGARDING INSTITUTIONAL CONTROLS

Section 10 Groundwater Protection District 1910A AUTHORITY In accordance with New Hampshire Revised Statutes Annotated (RSA) Chapter 4shy

C22 III as the same may be subsequently amended the City of Somersworth hereby adopts the following Groundwater Protection District

1910B PURPOSE The purpose of this ordinance is in the interest of public health safety and general welfare to protect preserve and maintain the existing and potential groundwater supply and groundwater recharge areas within the known aquifer from adverse development land use practices or depletion and to allow for the restoration of degraded groundwater by the establishment of a Ground Water Management Zone

1910C LOCATION

1910C1 The boundaries of the Groundwater Protection District shall be the outermost edge of the out wash deposits of the Lily Pond Aquifer as designated in the Report on Aquifer Definition Lily Pond Aquifer Somersworth New Hampshire prepared by BCI Geonetics Inc and included in the Water Master Plan Update dated June1984 The Ground Water Management Zone is designated by the Groundwater Management Zone Overlay Map included in the Preferred Remedial Action 100 Design ana Demonstration of Compliance Plan prepared by Beak International Inc and GeoSyntec Consultants International Inc

1910C2 When the actual boundary of the Groundwater Protection District is in dispute by any owner or abutter actually affected by said boundary the Planning Board at the ownerabutters expense and request may engage a professional geologist or hydrologist to determine more accurately the precise boundary of said Groundwater Protection District

1910D APPLICABILITY

1910D1 All land use activities and development conducted within the Groundwater Protection District shall be regulated by the standards established herein

1910D2 The standards established herein shall constitute the rules of an overlay zone and shall be superimposed over other zoning districts or portions thereof The provisions herein shall apply in addition to all other applicable ordinances and regulations In the event of a conflict between any provision herein and any other ordinance or regulation the more restrictive requirement shall control

1910E DEFINITIONS

1910E1 Animal Feed Lotspurpose of feeding

A plot of land on which 25 livestock or more per acre are kept for the

1910E2 Groundwater Water in the subsurface zone at or below the water table in which all pore spaces are filled with water

1910E3 Groundwater Management Zone (GMZ) The subsurface volume in which groundwater contamination associated with a discharge of a regulated contaminant is contained (State of NH Groundwater Protection Rules shy Env-WS410)

1910E4 Hazardous and Toxic Materials Those materials that pose a present or potential hazard to human health and the environment when improperly stored transported or disposed of These materials include those listed in the New Hampshire Hazardous Waste Regulations Third Edition Appendixes 1-4 1985 New Hampshire Dept of Environmental Services Concord as the same may be subsequently amended

1910E5 Impervious Surface A surface covered by any material (such as pavement cement roofing) that prevents surface water from penetrating the soil directly

1910E6 Leachable Wastes Waste materials including solid wastes sewage sludge and agricultural wastes that are capable of releasing waterborne contaminants to the surrounding environment

1910E7 Solid Waste Discarded solid material with insufficient liquid content to be free flowing This includes but is not limited to rubbish garbage scrap materials junk refuse inert fill material and landscape refuse

1910F PROHIBITED USES The following uses are expressly prohibited from the Groundwater Protection District (This section reformatted and renumbered)

1910F1 Within the Lily Pond Aquifer

1910F1 a The disposal of solid waste including landfills and sewage lagoons excepting disposal of stumps and brush

1910F1b Storage of road salt or other deicing chemicals except in a properly constructed shelter for use on site

1910F1 c Dumping of snow containing road salt or other deicing chemicals

1910F1d Motor vehicles service or repair shops

1910F1e Junk and salvage yards

1910F1f Animal feedlots

1910F1g Commercial or industrial handling disposal storage or recycling of hazardous or toxic materials or wastes and

19100F1h Underground storage of petroleum or any refined petroleum product All existing underground tanks including those under 1100 gallons must be registered with the Somersworth Fire Department within six months of the enactment of this regulation Existing tanks over 1100 gallons are subject to Water Supply and Pollution Control Commission regulation pursuant to New Hampshire Code of Administration No W5411

1910F2 Within the Groundwater Management Zone

1910F2a The requirements restrictions and prohibition of the underlying Zoning District shall continue to apply to the extent that they are not inconsistent with the provision of this section

1910F2b Pumping of groundwater from any well trench sump or other structure for residential irrigation agricultural of industrial purpose is prohibited

1910G SPECIAL CONDITIONSProtection District

The following conditions shall apply to all uses in the Groundwater

1910G1 A lot shall not be rendered more than ten percent (10) impervious A proposed development plan which will incorporate a stormwater drainage plan approved by the City of Somersworth Planning Board and prepared by a professional engineer certified to practice in the State of New Hampshire shall be provided The plan shall provide for the on-site retention and percolation of all development generated stormwater runoff from a ten (10) year storm Furthermore the stormwater drainage plan shall provide for the filtering of parking area runoff to remove oil gasoline and other impurities prior to retention and percolation of the runoff

1910G2 Development or land use activities proposed within the Groundwater Protection District shall be connected to the municipal sewage disposal system and the municipal water system

1910G3 Any use retaining less than thirty percent (30) of lot area regardless of size in its natural vegetative state with no more than minor removal of existing trees and vegetation shall require a special permit

1910G4 Mining operations including sand and gravel removal shall require an Earth Removal Permit pursuant to New Hampshire Revised Statutes Annotated Chapter 155-E which is herein incorporated by reference Such excavation or mining shall in no case be carried out within eight (8) vertical feet of the seasonal high water table and

1910G5 The storage of petroleum or related products in a freestanding fuel oil tank within or adjacent to a residential structure which is used for the normal heating of said structure shall be permitted pursuant to the conditions outlined in subsection H below and all applicable state regulations All tanks shall be protected from internal and external corrosion and shall be of a design approved by the Somersworth Fire Department All freestanding tanks shall be placed on an impermeable surface such as a concrete pad No tank may be abandoned in place A tank shall be disposed of after emptied of all hazardous materials if it has been out of service for a period in excess of twelve (12) months The product and the tank shall be disposed of by the property owner as directed by the Somersworth Fire Department and all applicable state laws All leaking tanks must be emptied by the owner or operator within twelve (12) hours after detection of the leak and removed by the owner andor operator as per above

1910H ADMINISTRATION

1910H1 Development or land use activities proposed within the Groundwater Protection District that require a special permit as provided in subsection G above shall be reviewed by both the Planning Board and the Somersworth Conservation Commission The Planning Board shall either approve conditionally approve or disapprove a special permit only after it determines that the proposed land use development andor activities comply with the purpose of this regulation In making such a determination the Planning Board shall give consideration to the simplicity reliability and feasibility of the control measures proposed and the degree of threat to groundwater quality if the control measures failed

1910H2 Development or land use activities proposed within the Groundwater Protection District that require subdivision or site plan approval from the Planning Board shall also be reviewed by the Somersworth Conservation Commission The Planning Board and the Conservation Commission shall verify that the proposed activity will conform to the provisions of this regulation ordinance prior to action by the Planning Board to approve conditionally approve or disapprove the application

1910H3 The Building Inspector shall not issue a building permit for development or land use activities until such time as heshe verifies that the proposed activity will conform to the provisions of this ordinance The Building Inspector may consult with the Planning Board andor Conservation Commission as heshe deems necessary

1910H4 Land use activities that do not require the receipt of Planning Board approval or building permits shall nonetheless be subject to the requirements and standards established herein

1910H5 A hydrogeologic study may be required by the Planning Board andor the Conservation Commission to investigate the impacts a proposed development or land use activity will have on an existing or future groundwater supply A qualified professional hydrologist or geologist shall be chosen by the City of Somersworth and the applicant for approval shall pay any and all costs incurred

1910H6 For all freestanding fuel oil tanks as permitted per Section 7 F the property owner shall file with the City of Somersworth the following information prior to the installation of a tank

1910H6a The size of the tank

1910H6b The type of tank

1910H6C The type of material being stored and its quantity

1910H6d The location of each tank on the premises complete with a sketch map and

1910H6e The age of each tank

19101 ENFORCEMENT If the Planning Board andor the Building Inspector finds that any of the requirements and standards established herein are in violation the Building Inspector shall order the owner in writing to make such corrections as heshe deems necessary to bring the development and activities into compliance with the provisions of this ordinance Such order shall be complied with within twenty-four (24) hours of the original notice to the owner Where the owner fails to comply with the order of the Building Inspector a fine of one hundred dollars ($100) per day or the maximum amount which is authorized by statute may be levied against said owner The fine shall be retroactive and shall begin to accrue on the date on which the property owner receives written notice from the Building Inspector that heshe is in violation of this ordinance

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX B

SITE INSPECTION FORMS

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

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APPENDIX A

CORRESPONDENCE REGARDING INSTITUTIONAL CONTROLS

Section 10 Groundwater Protection District 1910A AUTHORITY In accordance with New Hampshire Revised Statutes Annotated (RSA) Chapter 4shy

C22 III as the same may be subsequently amended the City of Somersworth hereby adopts the following Groundwater Protection District

1910B PURPOSE The purpose of this ordinance is in the interest of public health safety and general welfare to protect preserve and maintain the existing and potential groundwater supply and groundwater recharge areas within the known aquifer from adverse development land use practices or depletion and to allow for the restoration of degraded groundwater by the establishment of a Ground Water Management Zone

1910C LOCATION

1910C1 The boundaries of the Groundwater Protection District shall be the outermost edge of the out wash deposits of the Lily Pond Aquifer as designated in the Report on Aquifer Definition Lily Pond Aquifer Somersworth New Hampshire prepared by BCI Geonetics Inc and included in the Water Master Plan Update dated June1984 The Ground Water Management Zone is designated by the Groundwater Management Zone Overlay Map included in the Preferred Remedial Action 100 Design ana Demonstration of Compliance Plan prepared by Beak International Inc and GeoSyntec Consultants International Inc

1910C2 When the actual boundary of the Groundwater Protection District is in dispute by any owner or abutter actually affected by said boundary the Planning Board at the ownerabutters expense and request may engage a professional geologist or hydrologist to determine more accurately the precise boundary of said Groundwater Protection District

1910D APPLICABILITY

1910D1 All land use activities and development conducted within the Groundwater Protection District shall be regulated by the standards established herein

1910D2 The standards established herein shall constitute the rules of an overlay zone and shall be superimposed over other zoning districts or portions thereof The provisions herein shall apply in addition to all other applicable ordinances and regulations In the event of a conflict between any provision herein and any other ordinance or regulation the more restrictive requirement shall control

1910E DEFINITIONS

1910E1 Animal Feed Lotspurpose of feeding

A plot of land on which 25 livestock or more per acre are kept for the

1910E2 Groundwater Water in the subsurface zone at or below the water table in which all pore spaces are filled with water

1910E3 Groundwater Management Zone (GMZ) The subsurface volume in which groundwater contamination associated with a discharge of a regulated contaminant is contained (State of NH Groundwater Protection Rules shy Env-WS410)

1910E4 Hazardous and Toxic Materials Those materials that pose a present or potential hazard to human health and the environment when improperly stored transported or disposed of These materials include those listed in the New Hampshire Hazardous Waste Regulations Third Edition Appendixes 1-4 1985 New Hampshire Dept of Environmental Services Concord as the same may be subsequently amended

1910E5 Impervious Surface A surface covered by any material (such as pavement cement roofing) that prevents surface water from penetrating the soil directly

1910E6 Leachable Wastes Waste materials including solid wastes sewage sludge and agricultural wastes that are capable of releasing waterborne contaminants to the surrounding environment

1910E7 Solid Waste Discarded solid material with insufficient liquid content to be free flowing This includes but is not limited to rubbish garbage scrap materials junk refuse inert fill material and landscape refuse

1910F PROHIBITED USES The following uses are expressly prohibited from the Groundwater Protection District (This section reformatted and renumbered)

1910F1 Within the Lily Pond Aquifer

1910F1 a The disposal of solid waste including landfills and sewage lagoons excepting disposal of stumps and brush

1910F1b Storage of road salt or other deicing chemicals except in a properly constructed shelter for use on site

1910F1 c Dumping of snow containing road salt or other deicing chemicals

1910F1d Motor vehicles service or repair shops

1910F1e Junk and salvage yards

1910F1f Animal feedlots

1910F1g Commercial or industrial handling disposal storage or recycling of hazardous or toxic materials or wastes and

19100F1h Underground storage of petroleum or any refined petroleum product All existing underground tanks including those under 1100 gallons must be registered with the Somersworth Fire Department within six months of the enactment of this regulation Existing tanks over 1100 gallons are subject to Water Supply and Pollution Control Commission regulation pursuant to New Hampshire Code of Administration No W5411

1910F2 Within the Groundwater Management Zone

1910F2a The requirements restrictions and prohibition of the underlying Zoning District shall continue to apply to the extent that they are not inconsistent with the provision of this section

1910F2b Pumping of groundwater from any well trench sump or other structure for residential irrigation agricultural of industrial purpose is prohibited

1910G SPECIAL CONDITIONSProtection District

The following conditions shall apply to all uses in the Groundwater

1910G1 A lot shall not be rendered more than ten percent (10) impervious A proposed development plan which will incorporate a stormwater drainage plan approved by the City of Somersworth Planning Board and prepared by a professional engineer certified to practice in the State of New Hampshire shall be provided The plan shall provide for the on-site retention and percolation of all development generated stormwater runoff from a ten (10) year storm Furthermore the stormwater drainage plan shall provide for the filtering of parking area runoff to remove oil gasoline and other impurities prior to retention and percolation of the runoff

1910G2 Development or land use activities proposed within the Groundwater Protection District shall be connected to the municipal sewage disposal system and the municipal water system

1910G3 Any use retaining less than thirty percent (30) of lot area regardless of size in its natural vegetative state with no more than minor removal of existing trees and vegetation shall require a special permit

1910G4 Mining operations including sand and gravel removal shall require an Earth Removal Permit pursuant to New Hampshire Revised Statutes Annotated Chapter 155-E which is herein incorporated by reference Such excavation or mining shall in no case be carried out within eight (8) vertical feet of the seasonal high water table and

1910G5 The storage of petroleum or related products in a freestanding fuel oil tank within or adjacent to a residential structure which is used for the normal heating of said structure shall be permitted pursuant to the conditions outlined in subsection H below and all applicable state regulations All tanks shall be protected from internal and external corrosion and shall be of a design approved by the Somersworth Fire Department All freestanding tanks shall be placed on an impermeable surface such as a concrete pad No tank may be abandoned in place A tank shall be disposed of after emptied of all hazardous materials if it has been out of service for a period in excess of twelve (12) months The product and the tank shall be disposed of by the property owner as directed by the Somersworth Fire Department and all applicable state laws All leaking tanks must be emptied by the owner or operator within twelve (12) hours after detection of the leak and removed by the owner andor operator as per above

1910H ADMINISTRATION

1910H1 Development or land use activities proposed within the Groundwater Protection District that require a special permit as provided in subsection G above shall be reviewed by both the Planning Board and the Somersworth Conservation Commission The Planning Board shall either approve conditionally approve or disapprove a special permit only after it determines that the proposed land use development andor activities comply with the purpose of this regulation In making such a determination the Planning Board shall give consideration to the simplicity reliability and feasibility of the control measures proposed and the degree of threat to groundwater quality if the control measures failed

1910H2 Development or land use activities proposed within the Groundwater Protection District that require subdivision or site plan approval from the Planning Board shall also be reviewed by the Somersworth Conservation Commission The Planning Board and the Conservation Commission shall verify that the proposed activity will conform to the provisions of this regulation ordinance prior to action by the Planning Board to approve conditionally approve or disapprove the application

1910H3 The Building Inspector shall not issue a building permit for development or land use activities until such time as heshe verifies that the proposed activity will conform to the provisions of this ordinance The Building Inspector may consult with the Planning Board andor Conservation Commission as heshe deems necessary

1910H4 Land use activities that do not require the receipt of Planning Board approval or building permits shall nonetheless be subject to the requirements and standards established herein

1910H5 A hydrogeologic study may be required by the Planning Board andor the Conservation Commission to investigate the impacts a proposed development or land use activity will have on an existing or future groundwater supply A qualified professional hydrologist or geologist shall be chosen by the City of Somersworth and the applicant for approval shall pay any and all costs incurred

1910H6 For all freestanding fuel oil tanks as permitted per Section 7 F the property owner shall file with the City of Somersworth the following information prior to the installation of a tank

1910H6a The size of the tank

1910H6b The type of tank

1910H6C The type of material being stored and its quantity

1910H6d The location of each tank on the premises complete with a sketch map and

1910H6e The age of each tank

19101 ENFORCEMENT If the Planning Board andor the Building Inspector finds that any of the requirements and standards established herein are in violation the Building Inspector shall order the owner in writing to make such corrections as heshe deems necessary to bring the development and activities into compliance with the provisions of this ordinance Such order shall be complied with within twenty-four (24) hours of the original notice to the owner Where the owner fails to comply with the order of the Building Inspector a fine of one hundred dollars ($100) per day or the maximum amount which is authorized by statute may be levied against said owner The fine shall be retroactive and shall begin to accrue on the date on which the property owner receives written notice from the Building Inspector that heshe is in violation of this ordinance

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX B

SITE INSPECTION FORMS

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX A

CORRESPONDENCE REGARDING INSTITUTIONAL CONTROLS

Section 10 Groundwater Protection District 1910A AUTHORITY In accordance with New Hampshire Revised Statutes Annotated (RSA) Chapter 4shy

C22 III as the same may be subsequently amended the City of Somersworth hereby adopts the following Groundwater Protection District

1910B PURPOSE The purpose of this ordinance is in the interest of public health safety and general welfare to protect preserve and maintain the existing and potential groundwater supply and groundwater recharge areas within the known aquifer from adverse development land use practices or depletion and to allow for the restoration of degraded groundwater by the establishment of a Ground Water Management Zone

1910C LOCATION

1910C1 The boundaries of the Groundwater Protection District shall be the outermost edge of the out wash deposits of the Lily Pond Aquifer as designated in the Report on Aquifer Definition Lily Pond Aquifer Somersworth New Hampshire prepared by BCI Geonetics Inc and included in the Water Master Plan Update dated June1984 The Ground Water Management Zone is designated by the Groundwater Management Zone Overlay Map included in the Preferred Remedial Action 100 Design ana Demonstration of Compliance Plan prepared by Beak International Inc and GeoSyntec Consultants International Inc

1910C2 When the actual boundary of the Groundwater Protection District is in dispute by any owner or abutter actually affected by said boundary the Planning Board at the ownerabutters expense and request may engage a professional geologist or hydrologist to determine more accurately the precise boundary of said Groundwater Protection District

1910D APPLICABILITY

1910D1 All land use activities and development conducted within the Groundwater Protection District shall be regulated by the standards established herein

1910D2 The standards established herein shall constitute the rules of an overlay zone and shall be superimposed over other zoning districts or portions thereof The provisions herein shall apply in addition to all other applicable ordinances and regulations In the event of a conflict between any provision herein and any other ordinance or regulation the more restrictive requirement shall control

1910E DEFINITIONS

1910E1 Animal Feed Lotspurpose of feeding

A plot of land on which 25 livestock or more per acre are kept for the

1910E2 Groundwater Water in the subsurface zone at or below the water table in which all pore spaces are filled with water

1910E3 Groundwater Management Zone (GMZ) The subsurface volume in which groundwater contamination associated with a discharge of a regulated contaminant is contained (State of NH Groundwater Protection Rules shy Env-WS410)

1910E4 Hazardous and Toxic Materials Those materials that pose a present or potential hazard to human health and the environment when improperly stored transported or disposed of These materials include those listed in the New Hampshire Hazardous Waste Regulations Third Edition Appendixes 1-4 1985 New Hampshire Dept of Environmental Services Concord as the same may be subsequently amended

1910E5 Impervious Surface A surface covered by any material (such as pavement cement roofing) that prevents surface water from penetrating the soil directly

1910E6 Leachable Wastes Waste materials including solid wastes sewage sludge and agricultural wastes that are capable of releasing waterborne contaminants to the surrounding environment

1910E7 Solid Waste Discarded solid material with insufficient liquid content to be free flowing This includes but is not limited to rubbish garbage scrap materials junk refuse inert fill material and landscape refuse

1910F PROHIBITED USES The following uses are expressly prohibited from the Groundwater Protection District (This section reformatted and renumbered)

1910F1 Within the Lily Pond Aquifer

1910F1 a The disposal of solid waste including landfills and sewage lagoons excepting disposal of stumps and brush

1910F1b Storage of road salt or other deicing chemicals except in a properly constructed shelter for use on site

1910F1 c Dumping of snow containing road salt or other deicing chemicals

1910F1d Motor vehicles service or repair shops

1910F1e Junk and salvage yards

1910F1f Animal feedlots

1910F1g Commercial or industrial handling disposal storage or recycling of hazardous or toxic materials or wastes and

19100F1h Underground storage of petroleum or any refined petroleum product All existing underground tanks including those under 1100 gallons must be registered with the Somersworth Fire Department within six months of the enactment of this regulation Existing tanks over 1100 gallons are subject to Water Supply and Pollution Control Commission regulation pursuant to New Hampshire Code of Administration No W5411

1910F2 Within the Groundwater Management Zone

1910F2a The requirements restrictions and prohibition of the underlying Zoning District shall continue to apply to the extent that they are not inconsistent with the provision of this section

1910F2b Pumping of groundwater from any well trench sump or other structure for residential irrigation agricultural of industrial purpose is prohibited

1910G SPECIAL CONDITIONSProtection District

The following conditions shall apply to all uses in the Groundwater

1910G1 A lot shall not be rendered more than ten percent (10) impervious A proposed development plan which will incorporate a stormwater drainage plan approved by the City of Somersworth Planning Board and prepared by a professional engineer certified to practice in the State of New Hampshire shall be provided The plan shall provide for the on-site retention and percolation of all development generated stormwater runoff from a ten (10) year storm Furthermore the stormwater drainage plan shall provide for the filtering of parking area runoff to remove oil gasoline and other impurities prior to retention and percolation of the runoff

1910G2 Development or land use activities proposed within the Groundwater Protection District shall be connected to the municipal sewage disposal system and the municipal water system

1910G3 Any use retaining less than thirty percent (30) of lot area regardless of size in its natural vegetative state with no more than minor removal of existing trees and vegetation shall require a special permit

1910G4 Mining operations including sand and gravel removal shall require an Earth Removal Permit pursuant to New Hampshire Revised Statutes Annotated Chapter 155-E which is herein incorporated by reference Such excavation or mining shall in no case be carried out within eight (8) vertical feet of the seasonal high water table and

1910G5 The storage of petroleum or related products in a freestanding fuel oil tank within or adjacent to a residential structure which is used for the normal heating of said structure shall be permitted pursuant to the conditions outlined in subsection H below and all applicable state regulations All tanks shall be protected from internal and external corrosion and shall be of a design approved by the Somersworth Fire Department All freestanding tanks shall be placed on an impermeable surface such as a concrete pad No tank may be abandoned in place A tank shall be disposed of after emptied of all hazardous materials if it has been out of service for a period in excess of twelve (12) months The product and the tank shall be disposed of by the property owner as directed by the Somersworth Fire Department and all applicable state laws All leaking tanks must be emptied by the owner or operator within twelve (12) hours after detection of the leak and removed by the owner andor operator as per above

1910H ADMINISTRATION

1910H1 Development or land use activities proposed within the Groundwater Protection District that require a special permit as provided in subsection G above shall be reviewed by both the Planning Board and the Somersworth Conservation Commission The Planning Board shall either approve conditionally approve or disapprove a special permit only after it determines that the proposed land use development andor activities comply with the purpose of this regulation In making such a determination the Planning Board shall give consideration to the simplicity reliability and feasibility of the control measures proposed and the degree of threat to groundwater quality if the control measures failed

1910H2 Development or land use activities proposed within the Groundwater Protection District that require subdivision or site plan approval from the Planning Board shall also be reviewed by the Somersworth Conservation Commission The Planning Board and the Conservation Commission shall verify that the proposed activity will conform to the provisions of this regulation ordinance prior to action by the Planning Board to approve conditionally approve or disapprove the application

1910H3 The Building Inspector shall not issue a building permit for development or land use activities until such time as heshe verifies that the proposed activity will conform to the provisions of this ordinance The Building Inspector may consult with the Planning Board andor Conservation Commission as heshe deems necessary

1910H4 Land use activities that do not require the receipt of Planning Board approval or building permits shall nonetheless be subject to the requirements and standards established herein

1910H5 A hydrogeologic study may be required by the Planning Board andor the Conservation Commission to investigate the impacts a proposed development or land use activity will have on an existing or future groundwater supply A qualified professional hydrologist or geologist shall be chosen by the City of Somersworth and the applicant for approval shall pay any and all costs incurred

1910H6 For all freestanding fuel oil tanks as permitted per Section 7 F the property owner shall file with the City of Somersworth the following information prior to the installation of a tank

1910H6a The size of the tank

1910H6b The type of tank

1910H6C The type of material being stored and its quantity

1910H6d The location of each tank on the premises complete with a sketch map and

1910H6e The age of each tank

19101 ENFORCEMENT If the Planning Board andor the Building Inspector finds that any of the requirements and standards established herein are in violation the Building Inspector shall order the owner in writing to make such corrections as heshe deems necessary to bring the development and activities into compliance with the provisions of this ordinance Such order shall be complied with within twenty-four (24) hours of the original notice to the owner Where the owner fails to comply with the order of the Building Inspector a fine of one hundred dollars ($100) per day or the maximum amount which is authorized by statute may be levied against said owner The fine shall be retroactive and shall begin to accrue on the date on which the property owner receives written notice from the Building Inspector that heshe is in violation of this ordinance

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX B

SITE INSPECTION FORMS

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

Section 10 Groundwater Protection District 1910A AUTHORITY In accordance with New Hampshire Revised Statutes Annotated (RSA) Chapter 4shy

C22 III as the same may be subsequently amended the City of Somersworth hereby adopts the following Groundwater Protection District

1910B PURPOSE The purpose of this ordinance is in the interest of public health safety and general welfare to protect preserve and maintain the existing and potential groundwater supply and groundwater recharge areas within the known aquifer from adverse development land use practices or depletion and to allow for the restoration of degraded groundwater by the establishment of a Ground Water Management Zone

1910C LOCATION

1910C1 The boundaries of the Groundwater Protection District shall be the outermost edge of the out wash deposits of the Lily Pond Aquifer as designated in the Report on Aquifer Definition Lily Pond Aquifer Somersworth New Hampshire prepared by BCI Geonetics Inc and included in the Water Master Plan Update dated June1984 The Ground Water Management Zone is designated by the Groundwater Management Zone Overlay Map included in the Preferred Remedial Action 100 Design ana Demonstration of Compliance Plan prepared by Beak International Inc and GeoSyntec Consultants International Inc

1910C2 When the actual boundary of the Groundwater Protection District is in dispute by any owner or abutter actually affected by said boundary the Planning Board at the ownerabutters expense and request may engage a professional geologist or hydrologist to determine more accurately the precise boundary of said Groundwater Protection District

1910D APPLICABILITY

1910D1 All land use activities and development conducted within the Groundwater Protection District shall be regulated by the standards established herein

1910D2 The standards established herein shall constitute the rules of an overlay zone and shall be superimposed over other zoning districts or portions thereof The provisions herein shall apply in addition to all other applicable ordinances and regulations In the event of a conflict between any provision herein and any other ordinance or regulation the more restrictive requirement shall control

1910E DEFINITIONS

1910E1 Animal Feed Lotspurpose of feeding

A plot of land on which 25 livestock or more per acre are kept for the

1910E2 Groundwater Water in the subsurface zone at or below the water table in which all pore spaces are filled with water

1910E3 Groundwater Management Zone (GMZ) The subsurface volume in which groundwater contamination associated with a discharge of a regulated contaminant is contained (State of NH Groundwater Protection Rules shy Env-WS410)

1910E4 Hazardous and Toxic Materials Those materials that pose a present or potential hazard to human health and the environment when improperly stored transported or disposed of These materials include those listed in the New Hampshire Hazardous Waste Regulations Third Edition Appendixes 1-4 1985 New Hampshire Dept of Environmental Services Concord as the same may be subsequently amended

1910E5 Impervious Surface A surface covered by any material (such as pavement cement roofing) that prevents surface water from penetrating the soil directly

1910E6 Leachable Wastes Waste materials including solid wastes sewage sludge and agricultural wastes that are capable of releasing waterborne contaminants to the surrounding environment

1910E7 Solid Waste Discarded solid material with insufficient liquid content to be free flowing This includes but is not limited to rubbish garbage scrap materials junk refuse inert fill material and landscape refuse

1910F PROHIBITED USES The following uses are expressly prohibited from the Groundwater Protection District (This section reformatted and renumbered)

1910F1 Within the Lily Pond Aquifer

1910F1 a The disposal of solid waste including landfills and sewage lagoons excepting disposal of stumps and brush

1910F1b Storage of road salt or other deicing chemicals except in a properly constructed shelter for use on site

1910F1 c Dumping of snow containing road salt or other deicing chemicals

1910F1d Motor vehicles service or repair shops

1910F1e Junk and salvage yards

1910F1f Animal feedlots

1910F1g Commercial or industrial handling disposal storage or recycling of hazardous or toxic materials or wastes and

19100F1h Underground storage of petroleum or any refined petroleum product All existing underground tanks including those under 1100 gallons must be registered with the Somersworth Fire Department within six months of the enactment of this regulation Existing tanks over 1100 gallons are subject to Water Supply and Pollution Control Commission regulation pursuant to New Hampshire Code of Administration No W5411

1910F2 Within the Groundwater Management Zone

1910F2a The requirements restrictions and prohibition of the underlying Zoning District shall continue to apply to the extent that they are not inconsistent with the provision of this section

1910F2b Pumping of groundwater from any well trench sump or other structure for residential irrigation agricultural of industrial purpose is prohibited

1910G SPECIAL CONDITIONSProtection District

The following conditions shall apply to all uses in the Groundwater

1910G1 A lot shall not be rendered more than ten percent (10) impervious A proposed development plan which will incorporate a stormwater drainage plan approved by the City of Somersworth Planning Board and prepared by a professional engineer certified to practice in the State of New Hampshire shall be provided The plan shall provide for the on-site retention and percolation of all development generated stormwater runoff from a ten (10) year storm Furthermore the stormwater drainage plan shall provide for the filtering of parking area runoff to remove oil gasoline and other impurities prior to retention and percolation of the runoff

1910G2 Development or land use activities proposed within the Groundwater Protection District shall be connected to the municipal sewage disposal system and the municipal water system

1910G3 Any use retaining less than thirty percent (30) of lot area regardless of size in its natural vegetative state with no more than minor removal of existing trees and vegetation shall require a special permit

1910G4 Mining operations including sand and gravel removal shall require an Earth Removal Permit pursuant to New Hampshire Revised Statutes Annotated Chapter 155-E which is herein incorporated by reference Such excavation or mining shall in no case be carried out within eight (8) vertical feet of the seasonal high water table and

1910G5 The storage of petroleum or related products in a freestanding fuel oil tank within or adjacent to a residential structure which is used for the normal heating of said structure shall be permitted pursuant to the conditions outlined in subsection H below and all applicable state regulations All tanks shall be protected from internal and external corrosion and shall be of a design approved by the Somersworth Fire Department All freestanding tanks shall be placed on an impermeable surface such as a concrete pad No tank may be abandoned in place A tank shall be disposed of after emptied of all hazardous materials if it has been out of service for a period in excess of twelve (12) months The product and the tank shall be disposed of by the property owner as directed by the Somersworth Fire Department and all applicable state laws All leaking tanks must be emptied by the owner or operator within twelve (12) hours after detection of the leak and removed by the owner andor operator as per above

1910H ADMINISTRATION

1910H1 Development or land use activities proposed within the Groundwater Protection District that require a special permit as provided in subsection G above shall be reviewed by both the Planning Board and the Somersworth Conservation Commission The Planning Board shall either approve conditionally approve or disapprove a special permit only after it determines that the proposed land use development andor activities comply with the purpose of this regulation In making such a determination the Planning Board shall give consideration to the simplicity reliability and feasibility of the control measures proposed and the degree of threat to groundwater quality if the control measures failed

1910H2 Development or land use activities proposed within the Groundwater Protection District that require subdivision or site plan approval from the Planning Board shall also be reviewed by the Somersworth Conservation Commission The Planning Board and the Conservation Commission shall verify that the proposed activity will conform to the provisions of this regulation ordinance prior to action by the Planning Board to approve conditionally approve or disapprove the application

1910H3 The Building Inspector shall not issue a building permit for development or land use activities until such time as heshe verifies that the proposed activity will conform to the provisions of this ordinance The Building Inspector may consult with the Planning Board andor Conservation Commission as heshe deems necessary

1910H4 Land use activities that do not require the receipt of Planning Board approval or building permits shall nonetheless be subject to the requirements and standards established herein

1910H5 A hydrogeologic study may be required by the Planning Board andor the Conservation Commission to investigate the impacts a proposed development or land use activity will have on an existing or future groundwater supply A qualified professional hydrologist or geologist shall be chosen by the City of Somersworth and the applicant for approval shall pay any and all costs incurred

1910H6 For all freestanding fuel oil tanks as permitted per Section 7 F the property owner shall file with the City of Somersworth the following information prior to the installation of a tank

1910H6a The size of the tank

1910H6b The type of tank

1910H6C The type of material being stored and its quantity

1910H6d The location of each tank on the premises complete with a sketch map and

1910H6e The age of each tank

19101 ENFORCEMENT If the Planning Board andor the Building Inspector finds that any of the requirements and standards established herein are in violation the Building Inspector shall order the owner in writing to make such corrections as heshe deems necessary to bring the development and activities into compliance with the provisions of this ordinance Such order shall be complied with within twenty-four (24) hours of the original notice to the owner Where the owner fails to comply with the order of the Building Inspector a fine of one hundred dollars ($100) per day or the maximum amount which is authorized by statute may be levied against said owner The fine shall be retroactive and shall begin to accrue on the date on which the property owner receives written notice from the Building Inspector that heshe is in violation of this ordinance

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX B

SITE INSPECTION FORMS

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

1910E6 Leachable Wastes Waste materials including solid wastes sewage sludge and agricultural wastes that are capable of releasing waterborne contaminants to the surrounding environment

1910E7 Solid Waste Discarded solid material with insufficient liquid content to be free flowing This includes but is not limited to rubbish garbage scrap materials junk refuse inert fill material and landscape refuse

1910F PROHIBITED USES The following uses are expressly prohibited from the Groundwater Protection District (This section reformatted and renumbered)

1910F1 Within the Lily Pond Aquifer

1910F1 a The disposal of solid waste including landfills and sewage lagoons excepting disposal of stumps and brush

1910F1b Storage of road salt or other deicing chemicals except in a properly constructed shelter for use on site

1910F1 c Dumping of snow containing road salt or other deicing chemicals

1910F1d Motor vehicles service or repair shops

1910F1e Junk and salvage yards

1910F1f Animal feedlots

1910F1g Commercial or industrial handling disposal storage or recycling of hazardous or toxic materials or wastes and

19100F1h Underground storage of petroleum or any refined petroleum product All existing underground tanks including those under 1100 gallons must be registered with the Somersworth Fire Department within six months of the enactment of this regulation Existing tanks over 1100 gallons are subject to Water Supply and Pollution Control Commission regulation pursuant to New Hampshire Code of Administration No W5411

1910F2 Within the Groundwater Management Zone

1910F2a The requirements restrictions and prohibition of the underlying Zoning District shall continue to apply to the extent that they are not inconsistent with the provision of this section

1910F2b Pumping of groundwater from any well trench sump or other structure for residential irrigation agricultural of industrial purpose is prohibited

1910G SPECIAL CONDITIONSProtection District

The following conditions shall apply to all uses in the Groundwater

1910G1 A lot shall not be rendered more than ten percent (10) impervious A proposed development plan which will incorporate a stormwater drainage plan approved by the City of Somersworth Planning Board and prepared by a professional engineer certified to practice in the State of New Hampshire shall be provided The plan shall provide for the on-site retention and percolation of all development generated stormwater runoff from a ten (10) year storm Furthermore the stormwater drainage plan shall provide for the filtering of parking area runoff to remove oil gasoline and other impurities prior to retention and percolation of the runoff

1910G2 Development or land use activities proposed within the Groundwater Protection District shall be connected to the municipal sewage disposal system and the municipal water system

1910G3 Any use retaining less than thirty percent (30) of lot area regardless of size in its natural vegetative state with no more than minor removal of existing trees and vegetation shall require a special permit

1910G4 Mining operations including sand and gravel removal shall require an Earth Removal Permit pursuant to New Hampshire Revised Statutes Annotated Chapter 155-E which is herein incorporated by reference Such excavation or mining shall in no case be carried out within eight (8) vertical feet of the seasonal high water table and

1910G5 The storage of petroleum or related products in a freestanding fuel oil tank within or adjacent to a residential structure which is used for the normal heating of said structure shall be permitted pursuant to the conditions outlined in subsection H below and all applicable state regulations All tanks shall be protected from internal and external corrosion and shall be of a design approved by the Somersworth Fire Department All freestanding tanks shall be placed on an impermeable surface such as a concrete pad No tank may be abandoned in place A tank shall be disposed of after emptied of all hazardous materials if it has been out of service for a period in excess of twelve (12) months The product and the tank shall be disposed of by the property owner as directed by the Somersworth Fire Department and all applicable state laws All leaking tanks must be emptied by the owner or operator within twelve (12) hours after detection of the leak and removed by the owner andor operator as per above

1910H ADMINISTRATION

1910H1 Development or land use activities proposed within the Groundwater Protection District that require a special permit as provided in subsection G above shall be reviewed by both the Planning Board and the Somersworth Conservation Commission The Planning Board shall either approve conditionally approve or disapprove a special permit only after it determines that the proposed land use development andor activities comply with the purpose of this regulation In making such a determination the Planning Board shall give consideration to the simplicity reliability and feasibility of the control measures proposed and the degree of threat to groundwater quality if the control measures failed

1910H2 Development or land use activities proposed within the Groundwater Protection District that require subdivision or site plan approval from the Planning Board shall also be reviewed by the Somersworth Conservation Commission The Planning Board and the Conservation Commission shall verify that the proposed activity will conform to the provisions of this regulation ordinance prior to action by the Planning Board to approve conditionally approve or disapprove the application

1910H3 The Building Inspector shall not issue a building permit for development or land use activities until such time as heshe verifies that the proposed activity will conform to the provisions of this ordinance The Building Inspector may consult with the Planning Board andor Conservation Commission as heshe deems necessary

1910H4 Land use activities that do not require the receipt of Planning Board approval or building permits shall nonetheless be subject to the requirements and standards established herein

1910H5 A hydrogeologic study may be required by the Planning Board andor the Conservation Commission to investigate the impacts a proposed development or land use activity will have on an existing or future groundwater supply A qualified professional hydrologist or geologist shall be chosen by the City of Somersworth and the applicant for approval shall pay any and all costs incurred

1910H6 For all freestanding fuel oil tanks as permitted per Section 7 F the property owner shall file with the City of Somersworth the following information prior to the installation of a tank

1910H6a The size of the tank

1910H6b The type of tank

1910H6C The type of material being stored and its quantity

1910H6d The location of each tank on the premises complete with a sketch map and

1910H6e The age of each tank

19101 ENFORCEMENT If the Planning Board andor the Building Inspector finds that any of the requirements and standards established herein are in violation the Building Inspector shall order the owner in writing to make such corrections as heshe deems necessary to bring the development and activities into compliance with the provisions of this ordinance Such order shall be complied with within twenty-four (24) hours of the original notice to the owner Where the owner fails to comply with the order of the Building Inspector a fine of one hundred dollars ($100) per day or the maximum amount which is authorized by statute may be levied against said owner The fine shall be retroactive and shall begin to accrue on the date on which the property owner receives written notice from the Building Inspector that heshe is in violation of this ordinance

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX B

SITE INSPECTION FORMS

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

1910G4 Mining operations including sand and gravel removal shall require an Earth Removal Permit pursuant to New Hampshire Revised Statutes Annotated Chapter 155-E which is herein incorporated by reference Such excavation or mining shall in no case be carried out within eight (8) vertical feet of the seasonal high water table and

1910G5 The storage of petroleum or related products in a freestanding fuel oil tank within or adjacent to a residential structure which is used for the normal heating of said structure shall be permitted pursuant to the conditions outlined in subsection H below and all applicable state regulations All tanks shall be protected from internal and external corrosion and shall be of a design approved by the Somersworth Fire Department All freestanding tanks shall be placed on an impermeable surface such as a concrete pad No tank may be abandoned in place A tank shall be disposed of after emptied of all hazardous materials if it has been out of service for a period in excess of twelve (12) months The product and the tank shall be disposed of by the property owner as directed by the Somersworth Fire Department and all applicable state laws All leaking tanks must be emptied by the owner or operator within twelve (12) hours after detection of the leak and removed by the owner andor operator as per above

1910H ADMINISTRATION

1910H1 Development or land use activities proposed within the Groundwater Protection District that require a special permit as provided in subsection G above shall be reviewed by both the Planning Board and the Somersworth Conservation Commission The Planning Board shall either approve conditionally approve or disapprove a special permit only after it determines that the proposed land use development andor activities comply with the purpose of this regulation In making such a determination the Planning Board shall give consideration to the simplicity reliability and feasibility of the control measures proposed and the degree of threat to groundwater quality if the control measures failed

1910H2 Development or land use activities proposed within the Groundwater Protection District that require subdivision or site plan approval from the Planning Board shall also be reviewed by the Somersworth Conservation Commission The Planning Board and the Conservation Commission shall verify that the proposed activity will conform to the provisions of this regulation ordinance prior to action by the Planning Board to approve conditionally approve or disapprove the application

1910H3 The Building Inspector shall not issue a building permit for development or land use activities until such time as heshe verifies that the proposed activity will conform to the provisions of this ordinance The Building Inspector may consult with the Planning Board andor Conservation Commission as heshe deems necessary

1910H4 Land use activities that do not require the receipt of Planning Board approval or building permits shall nonetheless be subject to the requirements and standards established herein

1910H5 A hydrogeologic study may be required by the Planning Board andor the Conservation Commission to investigate the impacts a proposed development or land use activity will have on an existing or future groundwater supply A qualified professional hydrologist or geologist shall be chosen by the City of Somersworth and the applicant for approval shall pay any and all costs incurred

1910H6 For all freestanding fuel oil tanks as permitted per Section 7 F the property owner shall file with the City of Somersworth the following information prior to the installation of a tank

1910H6a The size of the tank

1910H6b The type of tank

1910H6C The type of material being stored and its quantity

1910H6d The location of each tank on the premises complete with a sketch map and

1910H6e The age of each tank

19101 ENFORCEMENT If the Planning Board andor the Building Inspector finds that any of the requirements and standards established herein are in violation the Building Inspector shall order the owner in writing to make such corrections as heshe deems necessary to bring the development and activities into compliance with the provisions of this ordinance Such order shall be complied with within twenty-four (24) hours of the original notice to the owner Where the owner fails to comply with the order of the Building Inspector a fine of one hundred dollars ($100) per day or the maximum amount which is authorized by statute may be levied against said owner The fine shall be retroactive and shall begin to accrue on the date on which the property owner receives written notice from the Building Inspector that heshe is in violation of this ordinance

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX B

SITE INSPECTION FORMS

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

19101 ENFORCEMENT If the Planning Board andor the Building Inspector finds that any of the requirements and standards established herein are in violation the Building Inspector shall order the owner in writing to make such corrections as heshe deems necessary to bring the development and activities into compliance with the provisions of this ordinance Such order shall be complied with within twenty-four (24) hours of the original notice to the owner Where the owner fails to comply with the order of the Building Inspector a fine of one hundred dollars ($100) per day or the maximum amount which is authorized by statute may be levied against said owner The fine shall be retroactive and shall begin to accrue on the date on which the property owner receives written notice from the Building Inspector that heshe is in violation of this ordinance

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX B

SITE INSPECTION FORMS

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

Somersworth Superfund Site Operation and GeoSyntec Consultants Maintenance Plan

APPENDIX B

SITE INSPECTION FORMS

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

Time of Inspection Inspection Personnel

Observed Weather Conditions

WEST SIDE SOIL SLOPE INSPECTION

Evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207AppendixB20040423doc 1 040507

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

CAP AND CAP AREA INSPECTION

Visual evidence of subsidence or settling

Seepage of leachate

Evidence of burrowing animals

Presence and location of erosion rills

Damage to vegetationvegetation height

Presence of woody plants

Observable irregularities such as bulges bumps slumps or cracks

Additional Comments

GQ0456-207Appendix B 2004 04 23 doc 04 05 07

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

DRAINAGE SYSTEM INSPECTION

Drainage system flow problems

Drainage system functioning

Condition of channel lining

Evidence of overflow rerouting or obstruction of drainage

Other observable irregularities

Additional Comments

GQ0456-207AppendixB20040423doc 3 040507

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

DRAINAGE SYSTEM INSPECTION

Drainage system flow problems

Drainage system functioning

Condition of channel lining

Evidence of overflow rerouting or obstruction of drainage

Other observable irregularities

Additional Comments

GQ0456-207AppendixB20040423doc 3 040507

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

UNDERGROUND VAULT SECURITY FENCE INSPECTION

Condition of Fences Gates Locks Chains

Condition of warning signs

Evidence of unauthorized access foreign object on-site

Evidence of burrowing animals

ACCESS ROAD INSPECTION

Condition of access road

Evidence of unauthorized use or foreign objects on-site

Evidence of burrowing animals or other irregularities

Additional Comments

GQ0456-207Appendix 820040423doc 040507

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

LANDFILL GAS VENT PIPE INSPECTION

Damage to vent pipes

Damage to sampling valves

Condition of vegetation around vent pipes

Additional Comments

GQ0456-207Appendix B 2004 04 23 doc 04 05 07

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

RESTRICTIVE COVENANTSDEED RESTRICTIONS

Unauthorized groundwater wells installed

Unauthorized construction activities

Additional Comments

OTHER

Additional Comments

GQ0456-207Appendix 820040423doc 6 040507

GeoSyntec Consultants

Date of Inspection

On-Site Inspection of the Somersworth Sanitary Landfill Superfund Site

New Hampshire

RESTRICTIVE COVENANTSDEED RESTRICTIONS

Unauthorized groundwater wells installed

Unauthorized construction activities

Additional Comments

OTHER

Additional Comments

GQ0456-207Appendix 820040423doc 6 040507

GeoSyntec Consultants

Photographic Log On-Site Inspection of the

Somersworth Sanitary Landfill Superfund Site New Hampshire

Date of Inspection

Photograph No Description

L 2

- 3

4

5

6

7

- 8

k_

9

10

k_shy11

12

- 13

14

15

16

17

- 18

19

^ 20

GQ0456-207Appendix B 2004 04 23 doc 7 04 05 07

1. barcode 66299
2. barcodetext SDMS Doc ID 66299