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ZE <br /> L <br /> Mr. Kenneth Earnest <br /> €'W <br /> February 27, 1992 <br /> r Page 2 <br /> benzene, toluene, ethylbenzene, and xylenes (BTE7) and total pa-rofe:,ni hydrocarbons (TPH) as <br /> gasoline. Ground water did not recharge into monitoring wells M111-1, MW-8, MW-16 and WW-25 <br /> after purging, therefore no samples were collected. A summary sof ground water sample analytical <br /> results since June 1991 is presented in Table 2. Enclosure C grs:'ins a table of ground water <br /> analytical results for ground water samples collected at the site since 1985. A dissolved benzene <br /> concentration map based on the December 1991 ground water sample analytical results is illustrated <br /> in Figure 4. Copies of the field sampling information sheets are presented in Enclosure D. Copies <br /> of the December 1991 ground water sample laboratory reports are presented in Enclosure E. <br /> Ground water analytical results indicate t.e petraleum Eydrocarbon cop_eentrations have decreased in <br /> sampes collected from RW-1 between Septeitioer a=id December 1991. Petroleum hydrocarbon <br /> concentrations have remaip.5d below detect nn limits in ground water sampled collected from <br /> monitoring wells MW-18, W-21, and MW-24. Hydrocarbon concentrations increased in the <br /> ground water in the sample rolleeted from ,monitoring well MW-27. <br /> The next quarterly.ground wat:-`monitoring and sampling event at this site is scheduled for <br /> March 1992. Delta recommends that copies of this report be forwarded to the following regulatory <br /> agencies: <br /> f <br /> Ms. Linda Turkatte Mr. James B. Maughan <br /> Public Health Services CRWQCB, Cent-al Valley Region <br /> County of San Joaquin 3443 Routier Road <br /> 1601 East Hazelton Avenue Sacramento, CA 95827-3098 <br /> Stockton, CA 95201 <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> n <br /> Richard E. Chandler <br /> Hydrogeologist _ <br /> s\ <br /> Martin . Burck, R.G. <br /> California Registered <br /> Geologist No. 5216 Via.52'is <br /> ------------------------REC•MSB Nerim.rtMm <br /> Enclosures CAUFQ��P <br />