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10-:.9�6-1996 1 :25PM FROM P_3 <br /> Mr. Infurha <br /> October 10, 1996 <br /> gage 2 <br /> conducted at the Site may have caused significant DCAcontain nat..o .n the groundwater beneath the. Site. <br /> Furthermore, the presence of elevated DCA <br /> concentrations: in the upgraidient monitoring well <br /> indicate that additional, sources located to the north, <br /> of the: Site may have contributed to the contam%natioW. <br /> eased on the, groundwater flow directions, PTSC 2 `3iev'es <br /> that the DCA contaminated groundwater may have i1<1.igrated <br /> of f ite <br /> PCA is an industrial solvents and has also been <br /> used as lead- scavenger 3 n antiknock gasoline. It ia; <br /> Ii stad: as a confirMed carcinogen by both the state And <br /> Federal Er ironmentil Protection Agencies. h.CA may <br /> Oleo cause dans, ad of the lungs, tc�cio <br /> effects on: the kidney, and severe corneal ef . cta. <br /> Experivnental data also indicates that DCA may have <br /> teraitogenic and reproductive effects. Human- muta::t.ion . <br /> data have alsol been reported. The State Maximum <br /> Contamination Level. (MCL) for DCA in the drinking water s <br /> Is O,5 ug/l.. In addition to 'DCA, elevated PCE and TCE <br /> at levels exceeding the State MCL of 5 ug/l were <br /> detected in the monitoring wells, Mw#1, MW#2, MW#3 and <br /> MW45 However, the PCE contamination may have been <br /> from an off-Site source. <br /> Based on phone conversations with you and Mr. <br /> Bxathovde, DTSC understands that upon determining a "nv <br /> further action required" , the County would have to <br /> proceed with regulatory closure for the Site and the <br /> five monitoring wells would have to be destroyed. <br /> However, in view of the Levels of DCS+, and other VOCs <br /> detected in the groundwater beneath the Site, the five <br /> monitoring wells are -necessary to be, remained open and <br /> sampling activities for the "VOCs must continue,. A "no <br /> further action" determination can only be made if the <br /> DCS, and ether volatile organic compounds found in the <br /> groundwater have been remedi:ated. <br /> Because the Site may be a source for the DCA <br /> detected in the groundwater, pursuant to bath State `arid <br /> Federal laws, the former owner and operator :of: the. <br /> Texaco Service Siration and existing owner and. operator <br /> of the:: property are potential responsible parties :and <br /> are requijred. to investigate and remediate the: <br /> contaminated soil. and groundwater. They are also <br /> resp 911b10 for Maintaining and monitoring -of :these <br /> mori%:t:o.rl n.g w.e.1:1 s: <br />