LIDDLE - Project-Related Work Experience

George Lee Liddle, III Project-Related Work Experience

Major Projects ∗ TMDL Diagnostic and Restoration Project, Upper San

Marcos Creek Watershed, San Marcos, California ∗ Former Oil Refinery and Current Metals Recycling

Facility, National City, California ∗ Municipal Storm Water Detention Basin Sampling,

Poway, California ∗ Maquiladora Phase I ESAs, Various Sites, Mexico

Project-Related Work Experience

Project-Related Work Experience

Other Projects

∗ Aquatic Pesticides Application Plan, Escondido, California

∗ Brownfield Redevelopment, San Diego, California

∗ Waste Hauler Maintenance Yard, San Diego, California

∗ Automobile Repair Facility, Escondido, California

∗ Former Gas Station, Chino Hills, California

∗ Former Agricultural Property, Fallbrook, California

∗ Gas Station, Santee, California ∗ Former Agricultural Property, Chula

Vista, California ∗ Former Gas Station, Guatay, California ∗ Bakery, Escondido, California ∗ Brownfield Redevelopment, San

Diego, California ∗ Phase I ESAs, Fontana and Chino,

California

Upper San Marcos Creek Watershed TMDL Project

Project Area Project area consists of Lake San Marcos Dam, Lake

San Marcos, San Marcos Creek upstream from the Lake, and the surrounding watershed

The project area is located within the Richland HSA(904.52) and the Twin Oaks HSA(904.53) of the San Marcos HA, which is part of the Carlsbad HU

Upper San Marcos Creek Watershed TMDL Project Regulatory Background

Lake San Marcos and San Marcos Creek are both listed as EPA Clean Water Act 303(d) Category 5A Impaired Water Bodies in SWRCB 2010 Final Integrated Report

TMDLs are being developed for the Lake for ammonia as nitrogen and nutrients

TMDLs are being developed for the Creek for DDE, phosphorus, sediment toxicity, and selenium


Clients City of San Marcos City of Escondido County of San Diego Vallecitos Water District Dongell Lawrence Finney Citizens Development Corporation


Scope of Work Dry weather Lake monitoring and sampling (3) 1 year of Creek monitoring Wet weather monitoring and sampling of Creek and

other surface conveyances (3) Drainage survey of watershed Monitor groundwater levels around the Lake Prepare project-related documents and reports


Role Conduct three rounds of all-day monitoring and sampling

at six locations in the Lake, consisting of water quality monitoring at 18-inch depth intervals and sampling at the surface, middle, and bottom at each location at dawn, midday, and dusk

Install pressure transducers in the Creek and in open air, to continuously monitor Creek depth

Collect Creek measurements to validate pressure transducer data and characterize cross-sectional area


Role Conduct two rounds of round-the-clock wet weather

monitoring and sampling at two stations within the Creek and five surface conveyances which drained into the Lake

Perform site selection of Creek stations to isolate specific historical land uses and target reaches and tributaries

Conduct a round of wet weather monitoring and sampling and a round of dry weather monitoring and sampling at five stations within the Creek and its tributaries


Role Collect GPS data to map the geography of the watershed

and identify access points to and connections of the storm drain system and major surface water inputs to the Lake

Install monitoring wells around the Lake, install pressure transducers and measure groundwater levels in the wells

Supervise field efforts and manage field staff Prepare QAPP, Workplans, SAPs, HSPs, Summary Reports,

and presentation materials

Upper San Marcos Creek Watershed TMDL Project Additional Responsibilities

Analyze Lake water quality data for trends with depth, time of day, location, and covariance between parameters

Adjust pressure transducer data using barometric data and field measurements and develop stage-discharge relationships for Creek and other surface conveyances

Develop flow and load estimates into the Lake during storm events and year-round

Create a set of custom spreadsheets for field measurements which outputs a composite recipe based on estimated flow

Prepare RFP to subcontract Lake modelling and evaluate proposals


Quote from Laurie Walsh, PE, of the San Diego RWQCB, regarding the 2013 Data Collection Report in Support of the Restoration of Lake San Marcos:

“I thought the 2013 Data Collection Report in Support of the Restoration of Lake San Marcos Report was excellent. In my 20 years at the San Diego Water Board I have read hundreds of reports. This report was easy to read and very well organized. The layout of this report was clear and the discussions concise. “Thank you for putting together a great report.”

Site Overview The site is located in National City, California,

approximately 0.30 miles east of San Diego Bay The site is a scrap metals receiving, storage,

and shipping facility The site has been used for oil refining and

distribution, as a lumber yard, railroad operations, and automobile shredding

Project Overview Soil and groundwater are known to be

contaminated with TPH, VOCs, SVOCs, PCBs, arsenic, cadmium, lead, vanadium, and zinc

Stormwater runoff is regulated under the IGP There is a RCRA Hazardous Waste stockpile,

approximately 3,200 cubic yards in volume, with lead as the primary driver for the waste classification

Scope of Work Groundwater monitoring and sampling Stormwater monitoring and sampling, as well

as regulatory compliance Tidal study Stockpile profiling, removal, monitoring,

transport, disposal, documentation, and reporting

Role Perform quarterly groundwater monitoring and

sampling Perform as-needed stormwater monitoring and

sampling during qualifying storm events Prepare Annual Report under 1997 IGP Prepare Client staff training materials and train Client

staff in stormwater Best Management Practices, in English and Spanish

Update SWPPP, Site map, and other PRDs for submittal to SMARTS for 2015 IGP

Evaluate water table for tidal influence based on a network of seven monitoring wells outfitted with pressure transducers

Municipal Stormwater Detention Basin Sampling / BMP Evaluation City of Poway Poway, California

City of Poway Project Overview

The project area consists of five stormwater detention basins located in Poway, California

The basins are part of the City’s SUSMP BMPs and are required to be monitored and sampled during a storm

City of Poway Scope of Work

Influent and effluent monitoring and sampling

Evaluate detention basin efficacy as stormwater BMPs

Prepare report

City of Poway Role

Develop novel winning pricing strategy Set and monitor autosamplers in

influent channels of detention basins After storm, collect samples and set

autosamplers in effluent channels Collect bacteria grab samples Evaluate influent and effluent results

and changes in CoC concentrations Prepare report

OTHER PROJECTS

• Assessed six sites, including a former metal working facility, a food-grade corn products depot, a chemical depot, an LED lighting assembly facility, a metal fabrication and finishing facility, and a plastic injection molding facility

• Hired by financing institution to assess Site conditions • Reviewed documents and performed Site evaluations for compliance with

Mexican regulations, conducted interviews in Spanish with Site contacts, produced reports in English for Client

MAQUILADORA PHASE I ESAS MONTERREY, NUEVO LEON, MEXICO

• Site 1 was an operating cardboard box manufacturing and printing facility • Site 2 was a vacant building, formerly an electronics assembly plant • Hired by financing institution to assess Site conditions • Reviewed documents and performed Site evaluations for compliance with

Mexican regulations, conducted interviews in Spanish with Site contacts, produced reports in English for Client

MAQUILADORA PHASE I ESAS TIJUANA, BAJA CALIFORNIA, MEXICO

• Project area comprises two lakes (Wohlford and Dixon) and a conveyance (Escondido Canal)

• Water in project area is used for human consumption, but nuisance algae impact beneficial uses

• City of Escondido uses copper sulfate pesticides to control the algae, triggering coverage under NPDES

• SWRCB requires an APAP be filed before application • Prepared an integrated vegetative control and pesticide application plan

based on historical water quality data, evaluation of remedial alternatives, beneficial uses, and management goals

• Prepared and submitted successful NOI and APAP • Prepared Water Monitoring Plan

AQUATIC PESTICIDE APPLICATION ESCONDIDO, CALIFORNIA

• Site consists of a vacant lot adjacent to Chollas Creek • Waste pre-characterization soil samples from undocumented fill contained

elevated levels of lead and pesticides • Site enrolled in DEH VAP, and received an EPA Brownfields Cleanup

grant and a DTSC Revolving Loan Fund subgrant • Prepared a QAPP and CHSP, collected additional waste pre-

characterization soil samples, and logged and classified the soil from the borings

BROWNFIELD REDEVELOPMENT SAN DIEGO, CALIFORNIA

• Site is a maintenance yard for a waste hauling company • Site received an NOV for unauthorized disposal of hazardous waste for

lead-bearing materials found in a trash dumpster • Site operator appealed the citation due to the waste material having been

pre-characterized as non-hazardous; similar material was stored in drums • Hired to generate composite samples from each of three drums of stored

waste material • Collected discrete samples from each vertical third of each drum, then

composited samples manually for each drum, evaluated analytical results for compliance with hazardous waste standards, including solubility tests, and assessed the claim that the material sampled by DEH was not representative of the material

WASTE HAULER MAINTENANCE YARD SAN DIEGO, CALIFORNIA

• Site has been an operating automobile repair shop since 1970 • Phase I ESA found current, historical, and potential RECs associated with

former inground hydraulic lifts, an inground wastewater sump/clarifier drain system, parts cleaning/degreasing units, historical detections of HVOCs in groundwater, and an historical UST release of TPHg and fuel oxygenates from an adjacent facility upgradient known to have impacted groundwater beneath the site with benzene and MTBE.

• Hired to assess the possible presence and concentrations of TPH and VOCs in soil beneath the site associated with the existing sump and clarifier systems, assessing the possible presence and concentrations of VOCs in the shallow soil vapor beneath site buildings, and performing an HHRA based on potential vapor-phase migration of VOCs into the site buildings.

AUTOMOBILE REPAIR FACILITY ESCONDIDO, CALIFORNIA

• Directed utility markout, measured the site, selected locations for direct-push soil borings, collected soil samples at discrete depth intervals, recorded PID readings from soil cuttings

• Selected locations for soil vapor probes and supervised the collection of soil vapor samples

• Reviewed analytical results and, due to detected concentrations of HVOCs in soil vapor samples, performed an HHRA, in accordance with the San Diego County SAM Vapor Risk 2000 Assessment model for commercial use, for both carcinogenic and noncarcinogenic risk

• Prepared report

AUTOMOBILE REPAIR FACILITY ESCONDIDO, CALIFORNIA

• Site was formerly a gas station • Four USTs were removed and petroleum hydrocarbons were found in the

excavations, impacting soil and groundwater • Hired to perform monitoring, sampling, and ISCO remediation using

hydrogen peroxide • Performed monitoring and sampling, compared pre- and post-remediation

analytical results and evaluated for treatment efficacy, prepared report of results and a Corrective Action Report

FORMER GAS STATION CHINO HILLS, CALIFORNIA

• Site was formerly used for agriculture • A three-stage clarifier, a fuel UST, and a fertilizer/weed oil UST have been

removed, and a release of fuel discovered • Site enrolled in DEH VAP • Performed groundwater monitoring and sampling

FORMER AGRICULTURAL PROPERTY FALLBROOK, CALIFORNIA

• Site is a gas station with multiple known releases from a system of 13 USTs

• Performed groundwater monitoring and sampling

GAS STATION SANTEE, CALIFORNIA

• Site was formerly used as an orchard, currently a vacant restaurant, planned for redevelopment with possible excavation and soil export

• Phase I ESA found a potential REC from this historical site land use, associated with possible residual concentrations of organochlorine and/or metals-based pesticides

• Hired to perform a subsurface assessment • Hand-augered borings to 5 feet bgs, collected discrete depth soil samples,

reviewed lab results, ordered additional analyses of on-hold samples as warranted, and prepared report

FORMER AGRICULTURAL PROPERTY CHULA VISTA, CALIFORNIA

• Site is a former gas station with a known release of petroleum hydrocarbons

• Site was approved for closure by the County DEH • Supervised the destruction of 22 groundwater monitoring wells and 4

vadose monitoring wells

FORMER GAS STATION GUATAY, CALIFORNIA

• Site is a former bakery • A Phase I ESA found a potential REC associated with a 12,000-gallon UST

which was removed from the site in 1986; confirmation soil samples contained CVOCs

• Hired to perform soil vapor sampling around the perimeter of the primary site building

• Supervised the collection of soil vapor samples

BAKERY ESCONDIDO, CALIFORNIA

• Site is a brownfield on the LUST database with an historical release of petroleum hydrocarbons from a system of 4 USTs

• Site scheduled for redevelopment involving soil excavation and export • Excavated soil was stockpiled on site, pending characterization • Responsible for overseeing the loading of stockpiled soil for

transportation and disposal and preparing manifests

BROWNFIELD REDEVELOPMENT SAN DIEGO, CALIFORNIA

• Sites were industrial plastics recycling facilities • Performed site reconnaissance • Reviewed regulatory records • Prepared reports

PHASE I ESAS FONTANA AND CHINO, CALIFORNIA

Documents

LIDDLE - Project-Related Work Experience