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gift <br /> Por . Doug Wilson , R.S . <br /> October 1, 1987 <br /> Page 4 <br /> 113 constituent in samples TEA-2 and TEA-4 is below the California <br /> Regional Water Quality Control Board, Central Valley Region <br /> (Regional Board) designated level for the protection of groundwater <br /> quality (September 1986) . The benzene in soil sample TEA-3 was <br /> detectable , but below the Regional Board designated level for the <br /> protection of groundwater quality. All other constituents in these <br /> three samples were below detection limits. <br /> Soil sample TSP-4 , from the waste oil-stained stockpile, had <br /> detectable EPA 8015 , modified constituents in the motor oil range. <br /> Soil sample TSP-5 from the visibly clean stockpile had detectable <br /> EPA 8015 , modified constituents in the motor oil range . Sample <br /> TSP-5 also had detectable pesticide constituents 4 , 4 ' -DDD and <br /> methoxychlor . No designated level has yet been established for <br /> 4 , 4 , -DDD. The methoxychlor constituent was below the Regional Board <br /> designated level for the protection of groundwater quality. All <br /> other constituents in these two samples were below detection limits. <br /> Based on these results, we recommend no additional excavation at the <br /> site . The waste oil product in the soil is detectable, but at <br /> levels which pose no immediate or long-term health threats . Both <br /> soil stockpiles should be removed and transported to a Class I <br /> landfill . Photocopies of the signed manifest for soil transport <br /> should be sent to San Joaquin County Local Health District, ARCO, <br /> and BC. <br /> Please review this report of our latest findings and conclusions, <br /> and inform us of any additional recommendations or requirements for <br /> the site . If you have any questions or comments , please contact <br /> Ms . Johanna Ambler . <br /> Very truly yours , <br /> BROWN AND CALDWE <br /> C... <br /> - 94�� <br /> iry . Phillips <br /> Project Manager <br /> LEP:JLA:mjd <br /> Enclosure <br /> cc/enc : Ms. Karen Schultheis ARCO Petroleum Products Company, <br /> San Mateo <br /> Mr . Hank Sheetz , ARCO Petroleum Products Company, <br /> Pleasanton <br /> Mr . Steve Welge , ARCO Petroleum Products Company, Fremont <br /> BROWN AND CALDWELL <br /> 723 S STREET SACRAMENTO,CA 95814 • (916)444-0123 <br />