Reso13 PC 13-09 2859 Initial Study Mitigated Negative Declaration Kensington

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' . . . - • State of California Dept of Transportation; Vallejo, California-Project manager for a site investigation, which included the installation of numerous monitoring wells and borings at site. Collected soil samples were used to define the vertical and horizontal extent of soil contamination at the property. As horizontal extent of soil contamination could not be defined by the original set of borings and wells, recommendations on location and number of additional borings and monitoring wells was forwarded to the client. PSI performed a subsequent investigation at the property about one year after the initial project. The additional investigation included the drilling of three additional monitoring wells and the drilling of three additional limited access borings. • Unocal Corporation; San Leandro, California-Project manager for a vapor extraction and aquifer test at the site to define the characteristics of the aquifer. The results of the vapor extraction and aquifer tests were utilized in a numerical model to identify the optimum number of wells and the pumping rates to remediate the site. The result of the tests and the numerical modeling were used in a feasibility test which included identifying remedial alternatives, selecting a remediation program based on technical acceptability, construction and operational cost, and regulatory acceptance. Permits from local agencies were then obtained and the remedial system constructed. • Shell Corporation; Brea, California-Proj ect manager for tank removal with the use of a mobile laboratory, soil contamination was confirmed during excavation, soil was transported to a licensed facility. Numerical model of the subsurface was prepared and various remediation alternatives superimposed to identify the most effective solution. A remediation plan was developed and submitted to the appropriate agencies. County, local, and NPDES permits were obtained to implement the remediation plan. A network of subsurface piping linking recovery wells to a centralized treatment facility was established during redevelopment of the property. The groundwater was treated with activated carbon and then discharged into local storm drain. Site now operates as fast food facility with on-going groundwater re covery/tre atment. Representative Hazardous Waste Project Experience • Port of Long Beach; Long Beach, California-Project hydrogeologist on a project that included a surface and subsurface investigation to determine the environmental impact of fugitive coke from a storage facility. The investigation included continuous coring, installing wells, soil and groundwater sampling, and analysis of the collected data. The investigation identified copper and other heavy metals in the coke. These metals appeared to have attenuated in the shallow soils and were not identified in the groundwater. The fieldwork included the installation, development, and sampling of groundwater wells. Continuous core samples were also collected during sampling procedure. Data was utilized to estimate leaching potential of heavy metals, identification of environmental pathways/receptors, fate/transport of identified constituents. • Lyons &Lyons Properties;Paramount, California-Project hydrogeologist on project involving assessment and cleanup of an unlined surface impoundment originally developed to collect surface runof£ Due to the nature of the surrounding industry, an assessment of the pond was initiated prior to the selling of property. Soil samples were collected from the bottom sediments of the impoundment and analyzed for metals, volatile organics, and base neutral extractable to provide broad coverage. Based on the results of the study, a cleanup program was required by the State of California. Prepared remedial action plan, and coordinated/supervised all cleanup activities at site. • Parker Hannifin; Irvine, California-Project manager on an extensive soil and groundwater investigation to determine the vertical and lateral extent of contamination from chlorinated solvents as well as potential sources of this contamination. The investigation was initiated with an extensive soil-gas survey that identified the sources of contamination as well as the magnitude of the contaminated area. Subsequently wells were installed and groundwater samples made to determine the lateral extent of contamination. The direction of groundwater flow was determined as well as the hydraulic properties of the aquifer. A File Name: PossF.doc Revised:8/06