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TOXICHEM Industrial Hygiene Exposure Assessment <br /> Quantitative Risk Assessment <br /> Management Compliance Audits <br /> Systems, Inc. Real Property Environmental Assessments <br /> Remedial Investigations <br /> Environmental&Occupational Health Services Air, Soil,and Groundwater Sampling <br /> 11 Kenton Avenue Remedial Engineering and Construction <br /> San Carlos, California 94070 Regulatory Compliance and Negotiation <br /> (650) 551-0112/ Fax(650) 551-0116 Litigation Support Services <br /> July 14, 2000 <br /> Project EQ-14.IA <br /> Mr. Philip Isorena <br /> California Regional Water Quality Control Board- <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3003 <br /> Re. Site Investigation Work Plan <br /> Equilon Bulk Fuel Facility- Stockton Plant <br /> 3515 Navy Drive, Stockton, California <br /> Dear Mr. Isorena: <br /> On behalf of Equiva Services LLC,Toxichem Management Systems, Inc. (TOXICHEM) has <br /> prepared this work plan in response to the California Regional Water Quality Control <br /> Board-Central Valley Region (CVRWQCB) letter dated June 8, 2000 regarding the site <br /> referenced above. The purpose of this proposed work is to define the lateral extent of petroleum <br /> hydrocarbons in the northeast section of the facility. <br /> This work plan includes a site description and the proposed scope of work. <br /> SITE DESCRIPTION AND BACKGROUND <br /> The site is an operating petroleum product distribution terminal situated in an industrial area on <br /> the northeastern side of Rough and Ready Island in Stockton, California(Figure 1). <br /> Groundwater monitoring has been performed at the site since August 1991. The groundwater <br /> monitoring program consists of measuring groundwater elevation, monitoring for separate-phase <br /> hydrocarbons (SPH), and sampling 29 on-and off-site groundwater monitoring wells. <br /> Groundwater currently ranges from approximately 6 to 13 feet below ground surface(bgs), but <br /> has historically fluctuated to greater than 24 feet bgs. Groundwater flow direction and gradient <br /> is typically to the south and southwest at a gradients ranging from 0.02 to 0.005 <br /> Site remediation consisting of groundwater extraction (GWE) is currently in progress at the site <br /> in accordance with Cleanup and Abatement Order 94-705 Additionally, the GWE system is <br /> scheduled to be restarted. <br /> PROPOSED SCOPE OF WORK <br /> The following proposed scope of work will provide information regarding the lateral extent of <br /> petroleum hydrocarbons in the northeast section of the facility. The June 8, 2000 CVRWQCB <br /> letter indicated that concentrations of total purgeable petroleum hydrocarbons (TPPH), total <br /> C:\TOXICHEM\Projeate\Eq\14\I A\workplm.dm <br />