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Shell Oil Company <br /> P.O. Box 4848 <br /> 511 N.Brookhurst Street <br /> Anaheim,California 92803 <br /> September 23 , 1992 <br /> Ms. Wend Cohen .,,!, . <br /> California Regional Water Quality Control Board SEP 2 8 1992 <br /> Central Valley Region <br /> 3443 Routier Rd, Suite A ENVIRONMENTAL HEALTH <br /> Sacramento, CA 95827-3098 PERM IT/Mvir % <br /> RE: SITE INVESTIGATION <br /> SHELL OIL CO. - STOCKTON DISTRIBUTION TERMINAL <br /> 3515 NAVY DR. , STOCKTON, CA. <br /> Dear Ms. Cohen: <br /> This letter is written in response to your letter of August <br /> 20, 1992 and responds to your request for submission of a <br /> workplan to define the vertical extent of soil and <br /> groundwater where hydrocarbons are present. I asked Harding <br /> Lawson Associates (HLA) to review your letter and respond <br /> with their recommendations. That letter, dated September 2 , <br /> 1992 is attached for your review. The HLA letter addresses <br /> soil sampling in the saturated zone. <br /> I would like to propose that the recommendations in HLA' s <br /> letter are followed. This would involve the installation of <br /> a deep well to determine the total mass of hydrocarbons in <br /> the groundwater system and would also allow us to monitor and <br /> sample deeper zones of the acquifer to check for vertical <br /> migration of hydrocarbons through the groundwater as you have <br /> requested. <br /> Regarding the vertical extent of soils containing petroleum <br /> hydrocarbons I would like to again refer to the HLA report <br /> titled PRELIMINARY HYDROGEOLOGIC ASSESSMENT, SHELL OIL <br /> DISTRIBUTION FACILITY, STOCKTON, CALIFORNIA, dated May 3 , <br /> 1991. This report details the findings of a soil gas survey <br /> covering Shell ' s entire parcel of property. The findings <br /> were consistent with soil samples taken during the <br /> installation of wells MW-13, MW-15, MW-16, and MW-17 . These <br /> results are also noted in the report mentioned above. <br /> Soil samples from the unsaturated zone will be taken during <br /> the installation of all new monitoring wells. However, given <br /> the existing data I do not see the benefit of spending a <br /> large amount of money on numerous soil borings at this stage <br /> of the remediation process. <br />