‘

MARCH, 2011

DFI No.: D00370 Facility Type: Water Quality Biofiltration

Swale

OPERATION & MAINTENANCE MANUAL

INDEX 1. IDENTIFICATION ....................................................................... 1

2. FACILITY CONTACT INFORMATION ....................................... 1

3. CONSTRUCTION ....................................................................... 1

4. STORM DRAIN SYSTEM AND FACILITY OVERVIEW ............ 2

5. FACILITY HAZ MAT SPILL FEATURE(S) ................................. 4

6. AUXILIARY OUTLET (HIGH FLOW BYPASS) ......................... 4

7. MAINTENANCE REQUIREMENTS ........................................... 5

8. WASTE MATERIAL HANDLING ............................................... 6

APPENDIX A: Operational Plan and Profile Drawing(s)

APPENDIX B: ODOT Project Plan Sheets

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1. Identification Drainage Facility ID (DFI): D00370 Facility Type: Water Quality Biofiltration Swale Construction Drawings: (V-File Number) 40V-091 Location: District: 7

Highway No.: 001 Mile Post: 103.93 / 103.95 (beg./end) Description: This facility is located on the western side of I-5 (Hwy 001, Pacific Highway) in the gore area between the Weaver Road southbound off-ramp and I-5. Access can be obtained from the southbound shoulder of I-5 or from the Weaver Road off-ramp.

2. Facility Contact Information Contact the Engineer of Record, Region Technical Center, or Geo-Environmental’s Senior Hydraulics Engineer for:

• Operational clarification • Maintenance clarification • Repair or restoration assistance

Engineering Contacts: Region Technical Center Hydraulics Engineer (541) 957-3693 Or Geo-Environmental Senior Hydraulics Engineer (503) 986-3365.

3. Construction Engineer of Record: ODOT Designer – Region 3 Tech. Center, James

Kent, P.E., 541-957-3573 Facility construction: 2006 Contractor: Hamilton Construction Company.]

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4. Storm Drain System and Facility Overview A water quality swale is a flat-bottomed open channel designed to treat stormwater runoff from highway pavement areas. This type of facility is lined with grass. Treatment by trapping sedimentation occurs when stormwater runoff flows through the grass. Stormwater for the facility is conveyed to the facility through a roadside ditch. The ditch collects stormwater from sheet flow generated by I-5 southbound travel lanes and the Weaver Road off-ramp. An inlet located at the beginning of the swale contributes flow from the Weaver Road overcrossing structure. Refer to the Operational Plan in Appendix A for further information. Water conveyed into the swale undergoes treatment as it flows through the length of the channel. The treated water flows out of the swale through an inlet that is connected to an 18-inch storm pipe. This storm pipe discharges into a roadside ditch on the west side of the Weaver Road southbound off-ramp. The flow from this roadside ditch is conveyed off of ODOT right-of-way before discharging into the South Umpqua River. A. Maintenance equipment access:

Maintenance crew can access the facility from the southbound shoulder of I-5 or from the Weaver Road off-ramp.

B. Heavy equipment access into facility:

Allowed (no limitations) Allowed (with limitations) Not allowed

C. Special Features:

Amended Soils Porous Pavers Liners Underdrains

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Photo 1: Looking south at the outlet control structure, flow into the swale is generated from I-5 shown on the left side of the picture and from the Weaver Road off-ramp shown to the right.

Photo 2: Looking north, flow into the swale is generated from I-5 shown on the right side of the picture and from the Weaver Road off-ramp shown to the left.

Primary Swale Outlet

Primary Swale Outlet

Swale Facility D00370

Weaver Road Southbound Off-

Ramp

Swale Facility D00370

I-5

Weaver Road

Swale High Flow Bypass

Outlet

Swale High Flow Bypass

Outlet

Inlet

I-5

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Photo 3: Looking south. Flow is generated from I-5, shown on the left side of the picture, from the Weaver Road off-ramp to the right, and from the inlet shown at the center of the picture.

5. Facility Haz Mat Spill Feature(s) The water quality biofiltration swale can be used to store a volume of liquid by blocking the 18-inch diameter outlet pipe located at the outlet of the water quality biofiltration swale. Refer to Photo 2 for a picture of outlet structure.

6. Auxiliary Outlet (High Flow Bypass) Auxiliary Outlets are provided if the primary outlet control structure can not safely pass the projected high flows. Broad-crested spillway weirs and over flow risers are the two most common auxiliary outlets used in stormwater treatment facility design. The auxiliary outlet feature is either a part of the facility or an additional storm drain feature/structure. The auxiliary outlet feature for this facility is:

Designed into facility A secondary auxiliary inlet/outlet grated catch basin has been designed as part of the facility’s outlet control structure, and acts as an emergency overflow in the event the primary outlet control device is plugged.

Swale Facility D00370

I-5

Swale Inlet

Weaver Road overcrossing

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Before flows ever reach the higher level of the secondary inlet/outlet device, however, they are typically released through a primary inlet/outlet grated catch basin located below the secondary device. If runoff should ever exceed the water quality event, where flows normally are directed to the lower primary outlet, the pond level will rise and flows will be released through the secondary auxiliary inlet/outlet device located just above the primary outlet.

Other, as noted below

7. Maintenance Requirements Routine maintenance table for non-proprietary stormwater treatment and storage/detention facilities have been incorporated into ODOT’s Maintenance Guide. These tables summarize the maintenance requirements for ponds, swales, filter strips, bioslopes, and detention tanks and vaults. Special maintenance requirements in addition to the routine requirements are noted below when applicable. The ODOT Maintenance Guide can be viewed at the following website: http://www.oregon.gov/ODOT/HWY/OOM/MGuide.shtml Maintenance requirements for proprietary structures, such as underground water quality manholes and/or vaults with filter media are noted in Appendix C when applicable. The following stormwater facility maintenance table (See ODOT Maintenance Guide) should be used to maintain the facility outlined in this Operation and Maintenance Manual or follow the Maintenance requirements outlined in Appendix C when proprietary structure is selected below:

Table 1 (general maintenance) Table 2 (stormwater ponds) Table 3 (water quality biofiltration swales) Table 4 (water quality filter strips) Table 5 (water quality bioslopes) Table 6 (detention tank) Table 7 (detention vault) Appendix C (proprietary structure) Special Maintenance requirements: Note: Special maintenance Requirements Require Concurrence from

ODOT SR Hydraulics Engineer.

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8. Waste Material Handling Material removed from the facility is defined as waste by DEQ. Refer to the roadwaste section of the ODOT Maintenance Yard Environmental Management System (EMS) Policy and Procedures Manual for disposal options: http://egov.oregon.gov/ODOT/HWY/OOM/EMS.shtml Contact any of the following for more detailed information about management of waste materials found on site: ODOT Clean Water Unit (503) 986-3008 ODOT Statewide Hazmat Coordinator (503) 229-5129 ODOT Region Hazmat Coordinator (541) 957-3594 ODEQ Northwest Region Office (503) 229-5263

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Appendix A

Content:

• Operational Plan and Profile Drawing(s)

DitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitchDitch

Southbound lanes(Interstate 5)

Northbound lanes(Interstate 5)

I-5 Off Ramp

I-5 On Ramp

I-5 On Ramp

I-5 Off Ramp

WE

AV

ER

RD

LEGEND:

Photo Location / Direction

andor

andor Manhole

Inlet

Storm Pipe

Conveyance Direction

Pavement / Facility Flow Path

Storm Pipe (Facility)

WE

AV

ER

RD

OREGON DEPARTMENT OF TRANSPORTATION

Prepared By:

Drafted By:

J. Carpenter

B. ShaferDOUGLAS COUNTY

WATER QUAL;ITY BIOFILTRATION SWALE

DFI D00370

MAINTENANCE DISTRICT 7 HWY 001

Bio Swale

(DFI D00370)

12 3

PACIFIC HIGHWAY MP 103.93/103.95

DFI00370AF:\ODOT_DATA\Projects\hydro\Jered\O&M Manual\DFI00370\D00370.dgn :: Default 7/1/2011 10:41:49 AM hwye33h

Southbound lanes(Interstate 5)

A

A

N.T.S.

BIO SWALE #2

2’

Min.Extg. ground

(off ramp side)

Profile gradeErosion control

matting

Native bio- filler mix

drainage swale

Stake per manufacturer’s

specifications and as

directed

5’

To Grade Break4’

1’

Min

.

12" Min.

top soil

Extg. ground

(I-5 S.B. side)

N.T.S.

SECTION A-A

118’ Bio Swale

Extg. Ground @ {

10’ for riprap pad

N.T.S.

PROFILE

OREGON DEPARTMENT OF TRANSPORTATION

Prepared By:

Drafted By:

J. Carpenter

B. ShaferDOUGLAS COUNTY

WATER QUAL;ITY BIOFILTRATION SWALE

MAINTENANCE DISTRICT 7 HWY 001

DFI D00370

PACIFIC HIGHWAY MP 103.93/103.95

DFI00370BF:\ODOT_DATA\Projects\hydro\Jered\O&M Manual\DFI00370\D00370.dgn :: Default 7/1/2011 10:41:52 AM hwye33h

Type "G2-MA" inlet,

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Appendix B

Content:

• ODOT Project Plan Sheets

o Cover/Title Sheet

o Water Quality/Detention Plan Sheets

o Other Details