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.• 3. <br /> MY- <br /> PMWEISS ASSOCIATES Consulting in Geofogy S Cieohydralogy <br /> 2054 University Ave., Suite 301/8erkeley, CA 94704 415.644.3281 <br /> 30 October 1986 <br /> Lori Cotulla <br /> Environmental Health Division <br /> Sen Joaquin Local Health District <br /> 1601 East Hazelton Avenue <br /> P.O. Box 2009 <br /> r• Stockton, CA 9201 <br /> Dear Ms. Cotulla, ! ;' <br /> This is the letter report that Weiss Associates (WA) agreed to provide ' l= <br /> ynu as preliminary documentation regarding the San Joaquin Mosquito Abatement <br /> Facility, Lodi, California_ <br /> rj• <br /> On 28 October Precision Industries (PI) excavated soil to 31 ft below <br /> ground surface, 6 ft below sample SJMB/2 which had 3,800 parts per million <br /> (ppm) total hydrocarbons (THC). Soil from the bottom of the excavation was #i <br /> w sampled and analyzed on a rush turnaround basis by Gas Chromatography/Flame <br /> Ionization Detection (CC/FIT)) for THC, benzene, toluene, xylene, and ethyl <br /> benzene (BTXEB) with dete,tion limits of 10 ppm for THC and 0.5 ppm for <br /> BTXEB. Analytic results from this sample,-numbered BH31, are as follows: <br /> .i <br /> Compound (ppm) <br /> Sample B T X EB THC <br /> 4 <br /> BH31 8.7 79 220 64 3,300 <br /> i <br /> The results indicate that fuel hydrocarbons extend below the reach of a <br /> large-sized excavator and may extend to ground water. Further excavation <br /> would be prohibitively expensive. Therefore WA recommends: <br /> 1) Install the 8,000-gallon weed oil tank . in the clean excavation <br /> adjacent to the gasoline tank excavation and move the location of <br /> 1,000-gallon gasoline tank to clean area. <br /> 2) Backfill contaminated gasoline tank excavation and install a ground <br /> water monitor well. <br /> A lairision cif Arltm7lrrr.r�lssaci,tfc5 lncnrporrfed <br />