Peter Quinlan To Co-Chair Hydrology and Law Seminar

Peter Quinlan, Dudek’s vice president and hydrogeology practice leader, is program co-chair for the “Science and Law of Water in California” seminar, taking place on Thursday, Sept. 17, in Santa Monica, CA.

Peter has more than 30 years’ experience as a professional hydrogeologist. His professional responsibilities include design and supervision of groundwater contamination investigations at hazardous waste sites. Areas of specialization include planning and supervision of field operations for groundwater and soils contamination investigations, groundwater modeling, water resource studies, cost allocation among multiple potentially responsible parties (PRPs) at Superfund sites, and environmental assessments. He holds an MS in Hydrology from the University of Arizona, and is a Registered Geologist (AZ No. 26772).

His experience is robust, and includes the following:

Litigation Support

  • Expert witness in insurance litigation at a PRP site in the Baldwin Park Operable Unit of the San Gabriel Valley Superfund sites.
  • Expert witness in insurance litigation at a groundwater contamination site that was formerly proposed for the National Priorities List.
  • Expert witness in insurance litigation concerning perchloroethylene (PCE) contamination at five industrial dry-cleaning plants in California and Arizona.
  • Expert witness in mediation settlement of litigation over relative contributions to groundwater contamination by trichloroethylene (TCE), perchlorate, and N-Nitrosodimethylamine (NDMA) from municipal solid waste and aerospace industrial waste at a landfill in Rancho Cordova.
  • Designated expert witness in mediation among three successor operators of an aerospace manufacturing facility in Monrovia. The objective of the mediation was to determine the relative contributions of TCE, 1,1,1-trichloroethane, and 1,4-dioxane to groundwater by the various operators.
  • Designated expert witness in mediation among three successor operators of an aerospace manufacturing facility in Monrovia. The objective of the mediation was to determine the relative contributions of TCE, 1,1,1-trichloroethane, and 1,4-dioxane to groundwater by the various operators.
  • Designated expert witness in litigation over mobility of arsenic at a landfill in Imperial County.
  • Expert witness in litigation over historical impact of a service station in San Diego.
  • Designated expert witness in litigation concerning alleged PCE contamination of a neighboring facility in Burbank.
  • Expert witness in insurance litigation concerning relative contributions of PCE and TCE from manufacturing operations and a landfill at a Resource Conservation and Recovery Act (RCRA) facility in Noblesville, Indiana.
  • Provided testimony in arbitration hearing regarding PCE contamination at a dry-cleaning site in Escondido.
  • Provided expert deposition testimony in insurance litigation concerning TCE, PCE, and chromium contamination at a manufacturing facility in Huntington Park.
  • Retained as an expert in toxic tort litigation over alleged TCE, PCE, perchlorate, and NDMA exposures in the San Gabriel Valley.
  • Designated expert in insurance litigation over TCE contamination of groundwater at the West Osborn Complex in Phoenix, Arizona.
  • Designated expert in litigation over causes of a landslide in Laguna Niguel.
  • Provided deposition testimony on rainfall infiltration and migration in litigation over construction defects in housing development in Gilbert, Arizona.

Cost Allocation

  • Prepared model to allocate costs among PRPs in Baldwin Park Operable Unit of San Gabriel Valley Superfund sites. Participated in remedy-driven allocation of costs based on unique treatment costs for perchlorate, NDMA, 1,4-dioxane, and volatile organic compounds (VOCs).
  • Participated in allocation mediation for the El Monte Operable Unit of the San Gabriel Valley Superfund sites, including the impacts of VOCs, chromium, perchlorate, and NDMA from 15 facilities on potential remedy costs.
  • Participated in allocation mediation of North Glendale Operable Unit of the San Fernando Valley Superfund sites.
  • Evaluated the potential contribution of Bradley Landfill to groundwater contamination in the North Hollywood Operable Unit of the San Fernando Valley Superfund Sites and prepared rationale for an appropriate allocation.
  • Participated in cost allocation discussions among PRPs at the BKK Landfill.
  • Participated in the preparation of cost-allocation models for the Stringfellow Acid Pits Superfund site.

Soil and Groundwater Contamination Studies

  • Designed and directed investigation of groundwater contamination by VOCs at manufacturing facilities, including aerospace, electric-component, and dry-cleaning establishments, located in California and Texas.
  • Designed and implemented in situ remediation pilot studies to destroy VOCs at two electric-component manufacturing facilities in Southern California. These field studies employed both ethanol-stimulated reductive dechlorination and oxidation using potassium permanganate.
  • Investigated soil and groundwater contamination at a PRP facility in the Glendale North Operable Unit of the San Fernando Valley Superfund sites.
  • Investigated soil and groundwater contamination by TCE, PCE, perchlorate, NDMA, 1,4-dioxane, and carbon tetrachloride in the Baldwin Park Operable Unit of the San Gabriel Valley Superfund sites. Also provided technical oversight of groundwater modeling for the Basic Political Organization Unit Steering Committee.
  • Investigated soil and groundwater contamination at a pesticide-applicator facility in San Diego. Work performed included preparing a hydrogeologic assessment report for submission to the Regional Water Quality Control Board.
  • Investigated the integrity of hazardous waste surface impoundments at a state Superfund site in El Centro. Worked performed included providing technical assistance in negotiating Consent Decree with California Department of Health Services, designing and conducting a remedial investigation/ feasibility study, and performing closure of surface impoundments in accordance with Toxic Pits Cleanup Act and Consent Decree.
  • Designed a program to monitor groundwater contamination by solvents, fuels, and metals involving 104 monitor wells at a manufacturing facility in Texas.
  • Prepared closure plan for municipal landfill for the Hualapai Nation, Peach Springs, Arizona.

Groundwater Modeling

  • Conducted model simulations of the potential impact of various growth scenarios on groundwater supplies for the Joshua Basin Water District. Results of these simulations aided District in the decision to import water to enhance recharge.
  • Performed vadose zone and groundwater modeling of a perchloroethylene (PCE) release for a party in Orange County Water District v. Northrop litigation over groundwater contamination with PCE, trichloroethylene (TCE), 1,4-dioxane, and perchlorate.
  • Developed solute transport model of a glacial outwash aquifer with complex surface-water/ groundwater interaction. Simulations included the replicating fate of VOCs degraded by reductive dehalogenation.
  • Prepared coupled vapor transport and groundwater transport models of VOC releases from landfills in California and Indiana.
  • Participated in the preparation of a finite element model of the San Gabriel Basin that was used to design a groundwater remedy in the Baldwin Park Operable Unit of the San Gabriel Valley Superfund sites.
  • Prepared three-dimensional density-driven flow model of the Tijuana River Valley to evaluate seawater intrusion, groundwater development alternatives, and groundwater recharge using reclaimed water and injection wells.
  • Prepared a groundwater model to simulate the effects of increased infiltration at a wastewater plant in Rancho Santa Fe, California.
  • Prepared groundwater model of the San Dieguito Valley to evaluate the effectiveness of coordinated groundwater pumping and reclaimed water recharge in reversing saltwater intrusion.
  • Prepared a solute transport model of a layered alluvial aquifer system to design groundwater remediation at a wood-treating facility in the Central Valley.
  • Prepared a solute transport model of a layered alluvial aquifer system to design groundwater remediation at the Kearney–KPF facility in Stockton. This model was also used to evaluate the relative contributions of various sources to groundwater contamination in support of insurance litigation.
  • Prepared a solute transport model of vadose zone and groundwater at West Osborn Complex in Phoenix, Arizona.
  • Prepared a groundwater model to simulate the impact of additional groundwater withdrawals from the Dyer Road well field in OrangeCounty for the Irvine Ranch Water District.
  • Prepared a model to simulate the potential impact of a new production well in Fountain Valley for the Laguna Beach County Water District.

Remedial Design and Implementation

  • Designed and implemented remediation of PCE and TCE in vadose zone in Burbank. No Further Action letter issued.
  • Designed and implemented a pump-and-treat groundwater remediation to treat VOC-contaminated groundwater at a manufacturing facility in California. Designed and implemented a soil vapor extraction to remediate VOC-contaminated soil.
  • Designed and implemented soil remediation and groundwater remediation technologies, including the injection of treated groundwater and modification to municipal well field pumpage patterns, to facilitate remediation at an electronic component facility in Stockton.
  • Designed enhanced in situ bioremediation of groundwater contaminated with chlorinated solvents.
  • Designed and implemented soil remediation technology at a pesticide-operation facility located in Southern California.
  • Designed and implemented a remedial investigation of chromium contamination and designed and installed a remedial well field at the Marley Cooling Tower Company Superfund site in Stockton.

Underground Storage Tank Investigations

  • Advised the City of Seal Beach on the adequacy of the investigation or groundwater, soil, and vapor contamination emanating from a service station within the City. Evaluated Corrective Action Plans prepared by the service station owner, advised the City and submitted comments to Orange County Health Care Agency. Participated in community meetings and city council meetings.
  • Investigated tank integrity and designed and installed continuous leak detection system using vapor detection for 20 underground storage tanks (USTs) at the Hughes Aircraft Facility in Los Angeles.
  • Developed and implemented work plan to close underground fuel storage tanks and investigate potential leakage at an aerospace manufacturing facility located in Los Angeles.
  • Investigated an 11,000-gallon gasoline leak from a UST and remediated free product and contaminated groundwater and soil located in Los Angeles.
  • Investigated soil contamination resulting from leakage of solvents at an aerospace manufacturing facility in Torrance.
  • Investigated groundwater contamination resulting from gasoline and diesel leakage from USTs in Encinitas.
  • Investigated groundwater contamination resulting from gasoline and diesel leakage from USTs in El Centro.
  • Investigated groundwater contamination resulting from gasoline leakage from USTs in San Diego.


Groundwater Supply and Development

  • Prepared a groundwater supply assessment for the Joshua Basin Water District including simulations of water level and storage declines in response to various demand growth scenarios. Evaluated recharge estimates, estimated storage, historical production and declines in groundwater levels and estimated both recharge from septic system discharges and water quality impacts associated with septic discharge. Identified potential sites for artificial recharge through capture of storm runoff and imported water.
  • Designed and prepared well specification for a new production well for Joshua Basin Water District. Evaluated potential spreading basin locations for aquifer recharge with imported water.
  • Evaluated potential impact of a new production well on water levels and pump submergence in existing wells, on seawater intrusion, and on colored water migration in the Orange County groundwater basin for the Laguna Beach County Water District.
  • Investigated the groundwater resources and sustainable yield of a 23,000 acre ranch in San Diego County. Work included exploration drilling, production well construction, and measuring rainfall, surface water runoff, changes in soil moisture, and changes in groundwater storage. Estimated infiltration, losses to evapo-transpiration to calculate recharge and sustainable yield through water balance analysis. Ecohydrology study evaluated water demands of native plant populations in upland and riparian areas. Project is ongoing.
  • Investigated the groundwater resources and sustainable yield of a 25,000 acre ranch in SanBarbaraCounty. Work included measuring rainfall, surface water runoff, changes in soil moisture, and changes in groundwater storage. Estimated infiltration, losses to evapo-transpiration to calculate recharge and sustainable yield through water balance analysis. Ecohydrology study evaluated water demands of native plant populations in upland and riparian areas. Project is ongoing.
  • Evaluated potential increases in salinity in a groundwater basin to support a Basin Plan Amendment by the RWQCB for the Ramona Municipal Water District.
  • Conducted resource evaluation and prepared groundwater management plan in accordance with AB 3030 to develop groundwater resources in the Tijuana Valley. Designed a groundwater exploration program for the San Diego Formation that included the installation of two 1,400‑foot-deep observatory wells and a 1,200‑foot-deep production well.
  • Evaluated impacts of increased production from the Dyer Road well field for the Irvine Ranch Water District.
  • Investigated the groundwater impacts of increased sewage effluent percolation at a pollution-control facility in Rancho Santa Fe.
  • Conducted a hydrogeologic exploration and resource evaluation of the Ibri area of the Sultanate of Oman and of the Najd Area of Dhufar Province.
  • Conducted a hydrogeologic exploration and resource evaluation of the Jabal Qara and Nadj Areas of Dhufar Province in the Sultanate of Oman which entailed selecting locations,drilling, and aquifer testing for 21 exploration wells to depths of 800 meters.
  • Investigated hydraulic conductivity of dual-porosity Miocene formations by means of packer testing in Salalah, Sultanate of Oman.
  • Investigated seawater intrusion along the SalalahCoast, Sultanate of Oman.

Groundwater/Surface Water/Habitat Interaction – Ecohydrology

  • Ecohydrology study evaluated water demands of native plant populations in upland and riparian areas on a 23,000 acre ranch in San Diego County and the potential impact of groundwater development. Work included measuring rainfall, surface water runoff, changes in soil moisture, transpiration measurement, and logging plant species and numbers in gridded test cells. Estimated habitat water requirements by measuring changes in soil moisture and measuring sap flux. Project is ongoing.
  • Ecohydrology study evaluated water demands of native plant populations in upland and riparian areas on a 25,000 acre ranch in Santa Barbara County. Work included measuring rainfall, surface water runoff, changes in soil moisture, and estimating transpiration. Estimated habitat water requirements by measuring changes in soil moisture. Project is ongoing.
  • Evaluated seasonal water quantity and quality requirements of cis-montane alkali marsh on Newhall Ranch in Los Angeles County. Marsh grasses were sustained by brackish groundwater containing sulfate at concentrations up to 5,000 milligrams per liter. Work included installation and monitoring of shallow piezometers, slug testing to determine hydraulic properties of the soil, soil installation and monitoring of moisture probes, continuous groundwater level measurements and periodic water quality sampling.
  • Evaluated seasonal water quantity and quality requirements of wetlands habitat on a 250,000 acre ranch in Los Angeles and Kern Counties. The study looked into potential seasonally varying sources of water to the wetlands and the potential impact of groundwater development. Work included installation and monitoring of shallow piezometers, soil moisture probes, continuous groundwater level measurements, periodic water quality sampling, isotope analyses, and spring discharge monitoring.
  • Evaluated the potential effect of intercepting suburban runoff for nuisance nutrient treatment/reuse and the effect of expanding the acreage of the Gobernadora Ecological Restoration Area on groundwater elevations in Gobernadora Canyon and the potential impact on shallow-rooted plants in the restoration area.