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wax^+ � ��`a ... - •« tee ^' - � - - µr' -., aC.K�- u*;.� � .,. °1... �+ <br /> Pt <br /> Mr. Kyle Christie <br /> June 29, 1959 <br /> Page ; � � <br /> JUL � 1999 <br /> Conclusions ENVIRONMENTA+HEALTH <br /> QERMITISERVICV <br /> Groundwater samples collected during the Winter quarter 1989, show that benzene <br /> concentrations arc increasing in wells E-2, E-5, E-8, E-9, E-]0, and E- <br /> could be t 12. This increase <br /> he result of two factors: (1) contamination is being pulled by the recovery system <br /> toward the site from another source. A Chevron station, located north of the site, across <br /> Benjamin Holt Drive, has a confirmed soil contamination and suspected groundwater <br /> contaminatiou problem; and <br /> aforementioned Che+•rort station)has cbeen�underoconstruction ubilized recently. <br /> cTheentirc stafII tile tion was 1' 3 <br /> demolished and the asphalt covering the lotwas removed. This has increased rain water <br /> access to contaminated soil, and therefore, caused the solubilixation of product from the soil <br /> into the groundwater. <br /> The BETX concentrations in well PR-1 have decreased-to nondetectable since the fall quarter <br /> 1988. BETX was nondetectable in well PR-I for all quarterly sampling events prior to the <br /> fall quarter 1988. This one-time occurrence of BETX is represantative of a samp lin <br /> or cross contamination during the sampling of well PR-I in th-; fall quarter 1988. b error <br /> Recommendations <br /> Continued quarterly monitoring of the site is recommended. Monitoring wells PR-I, BHD_1, <br /> E-2, E-5, E-8, E-10, E-11, and E-12 should be sampled on the new quarterly schedule, which <br /> begins in May 1989. <br /> Very truly yours, <br /> BROWN AND CALDWELL <br /> Phillips <br /> �r <br /> Proj Manager <br /> " LEP:PYD:mkw <br /> Enclosure <br /> cc/enc: Ms. Laurie Caiulla, San Joaquin County Health Department <br /> Mr. John Randall, Chevron <br /> Mr. Chris Winsor, ARCO Products Company <br /> BROWN AND CALDWELL <br /> 723SSTREET SACRALMENTO•GWFORNN 92 r916) /4•0123 '' �\ <br />