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AEGIS ENVIRONMENTAL , INC . <br /> 801 Riverside Avenue,Suite C,Roseville,CA 95678 + 916.782-2110/916.969-2110/FAX 916.786-7830 <br /> January 4 , 1991 <br /> Environmental Health Permit/ Services <br /> San Joaquin Local Health District <br /> 1601 E. Hazelton Ave. <br /> Stockton CA. 95201 ��✓�, ✓9 <br /> Attn: Elinor Ratliff <br /> Subject: Site Assessment Results Report <br /> Shell <br /> 6131Pacific eAvenue <br /> on <br /> Stockton, CA <br /> Enclosed is a copy of the site assessment report for the above <br /> referenced site. Please review and provide comments. On behalf of <br /> Shell Oil Co. , Aegis wishes to make the following <br /> recommendations: <br /> 1) An interim-remedial action plan (RAP) should be <br /> prepared and submitted to the county. The RAP will <br /> include design specifications, pilot test <br /> specifications and monitoring plan for a vapor <br /> extraction system. The RAP will also include a <br /> contingency for a ground water extraction system if <br /> gradient control is necessary. <br /> 2) Installation of off-site ground water monitoring wells <br /> to define the extent of dissolved petroleum <br /> hydrocarbons in ground water. <br /> 3) Monthly ground water elevation and product thickness <br /> measurements. <br /> 4) Quarterly ground water sampling. Ground water samples <br /> would be analyzed for petroleum constituents and fecal <br /> and total coliform (quarterly in selected wells) as <br /> specified by San Joaquin County. <br /> 5) Documentation of the ambient ground water parameters <br /> should be completed. This would include the analysis of <br /> three samples from selected wells for bicarbonate, <br /> carbonate and hydroxide alkalinity, Ca, chloride, Cu, <br /> fluoride, hardness, Fe, Mg, Mn, pH, K, Na, sulfate, <br /> total dissolved solids, and Zinc. <br /> GEOLOGISTS • ENGINEERS • GROUND WATER SCIENTISTS <br />