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a � <br /> t <br /> Mr. Kenneth Earnest <br /> February 27, 1992 <br /> r Page 2 <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons (PPH) as <br /> gasoline. Ground water did not recharge into monitoring wells WN-1,MW-$, MW-16 and MW-25 <br /> after purging,therefore no samples were collected. A summary of!ground water sample analytical <br /> results since June 1991 is presented in Table 2. Enclosure C contains a tame 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 fie:Z 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 the petroleum hydrocarbon concentrations have decreased in <br /> samples collected from 1?W-1 between September and December 1991. Petroleum hydrocarbon <br /> concentrations have remained below detection limits in ground water sampled collected from <br /> monitoring wells MW-18, MW-21, and MW-24. Hydricarbon concentrations increased in the <br /> ground water in the sample collected from monitoring well MW-27. <br /> The next quarterly ground water 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 /> Ms.Linda Turlkatte Mr.James B. Maughan <br /> L Public Health Services CRWQCB, Central Valley Region <br /> County of San Joaquin 3443 Routier Road <br /> 160I East Hazelton Avenue Sacramento, CA 95827-3098 <br /> Stockton, CA 95201 <br /> i <br /> Sincerely, } <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> Richard E. Chandler <br /> Hydrogeologist -� <br /> lam'} l <br /> Mallin .Burck, R.G. <br /> California Registered No.5215 <br /> Geologist No. 5216 <br /> Enclosures OF + l - <br />