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Applied GeoSystems 4191-E Power Inn Road, Sacramento, CA 95826 (916) 452-2901 <br /> • FREMONT • COSTA MESA • SACRAMENTO • HOUSTON <br /> May 19, 1988 <br /> 0519DCAR <br /> AGS Job No. 038032-1 <br /> David R. Carls, R.S. <br /> San Joaquin Local Health District <br /> Environmental Health Division <br /> 1601 East Hazelton Ave. fs�ur. <br /> Stockton, California 95201Subject: Addendum to Work Plan for a Suce Environmental <br /> Investigation, UNOCAL Service Station No. 6981, 4707 <br /> Pacific Avenue, Stockton, California. <br /> Mr. Carls: <br /> As per our telephone conversation of the morning of May 19, 1988 , <br /> excavation operations will address the soil in the vicinity of <br /> previous soil samples S-4-Line4 and S-4-Line8 in an attempt to <br /> remove soil with hydrocarbon contamination above laboratory <br /> detectable limits. Soil samples will be collected under the <br /> observation of personnel of the San Joaquin Environmental Health <br /> Department. Applied GeoSystems will not recommend backfilling of <br /> the excavation until soil sample results are obtained from the <br /> laboratory. <br /> As per your request, UNOCAL will also provide your office with <br /> information relating to the latest precision tests conducted on <br /> underground storage tanks and associated piping at the above <br /> referenced site. The condition of the removed piping and <br /> locations of possible sources of contamination will also be <br /> addressed. This information will be presented in our letter <br /> report after conclusion of excavation operations. If you have <br /> any further questions, please do not hesitate to call. <br /> Sincerely, <br /> Applied GeoSystems <br /> Keith A. Romstad <br /> Project Geologist <br />