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y. <br /> J:hxk`7,'S'Y�gly <br /> r <br /> I� 9I <br /> WEISS ASSOCIATES Consulting in Geology E Geohy&vlogy <br /> PM <br /> . •-'k..e� a!npM,:. rn.'-w.n.wEa rz.n..w.,.-.•ea <br /> 2054 University Ave., Suite 301/Berkeley, CA 94704 .�� 4.13.644-3.281 <br /> li € .. <br /> it 4 r <br /> 6 <br /> !' "� <br /> 30 October 1986 <br /> I y Lori Cotulla ^r <br /> Environmental Health Division <br /> F San Joaquin Local Health District I j <br /> 1601 East Hazelton Avenue <br /> i <br /> P.O. Box 2009 i± ` <br /> t. Stockton CA 95201 1: <br /> Dear Ms. Cotulla, I <br /> i' <br /> This is the letter report that Weiss Associates (WA.) agreed to protide <br /> you as preliminary documentation regarding the San Joaquin Mosquito Abatement <br /> Facility, Lodi, California. !? <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 /> (Qpm) total hydrocarbons (THC). Soil from the bottom of the 'excavation was <br /> sampled and analyzed on a rush turnaround basis by Ge Chromatography/Flame <br /> Ionization Detection (GC/FID) for THC, benzene, toluene, xylene, and ethyl <br /> benzene (BTXEB) with detection limits of 10 ppm for THC and 0.5 ppm for <br /> BTXEB. Analytic results from this sample, numbered BH31, I,1are as follows: r <br /> f <br /> Compound (ppm) I j <br /> Sample B T X EB THC' <br /> Il � <br /> BH31 8.7 79 220 64 3,300 i <br /> Ij o <br /> The results indicate that fuel hydrocarbons extend below the reach of a <br /> large-sired excavator and may extend to ground water. Further excavation l <br /> would be prohibitively expensive. Therefore WA recommends: <br /> L; <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 cf <br /> 1,000-gallor, gasoline tank to clean area. 11 <br /> I .4 <br /> 2) Backfill contaminated gasoline tank excavation and install a ground <br /> water monitor well. <br /> ik <br /> A Dnv, ,l �/rkHr:�Iirrr.e Ad<fri:f0�'lnrcr=ortfevl ,� { <br /> i <br /> Ir ° <br /> ii <br /> I' F <br /> I� I I <br />