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

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

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

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

• 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

• 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

• 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

• 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

• 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

• Sites were industrial plastics recycling facilities
• Performed site reconnaissance
• Reviewed regulatory records
• Prepared reports
PHASE I ESAS
FONTANA AND CHINO, CALIFORNIA

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