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ClaN'toll Clayton speculates that the oil and grease found in MW-1 and MW-2 may have come from oil-based sprays applied to the site for agricultural purpost.% • Low levels of gasoline and the .olatile hydrocarbons ethylhenzene and sylene were Lound in the writer sample retrieved trona MW-3 These levels do 1101 exceed the Calitornia DHS action levels Clayton concludes that the presence; Of hydrocarbons in MW-3 are almost Lertmnly caused by the presence of the: USE • Pesticides and PCBs were below detection limits in all three wells • Groundwater depths range tram approximately 8 to 10 S feet bgs in the walls The groundwater Flow direction is almost directly north Groundwater gradient is 03fr/100fY • Kaprealian Engineerin r, Inc installed a groundwater monitonng well near the former location of the UST in 1986 Groundwater was analyzed tar gasoline, benzene, toluene, ethylbenzene, and xylene but none of these compounds were detected A review of the Kapreahan Engineering, Inc, report revealed that they probably installed the well on the upgradient side of the UST, which explains why they did not find detectable levels of hydrocarbons 6.0 DLSCLAIMEg The information and opinions rendered in this report are exclusively for your use and will not be distnbuted or published without your consent The informatiop in this report is given in response toyyour limited assignment and should be evaluated only in light of that assignment We accept responsibility for the competent performance of our duties in executing the assignment and preparing this report in ^,—cordance with the normal standards of our profession but disclaun any responsibility for consequential damages 7.0 REFERENCES Leaking Underground Fuel Tank(LUFT) Field Manual Guidelines for Site Assessment, Cleanup, and UndergroL d Tank Closure, May 1988 State of California LUFT Task Foro_