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<br /> CAMBRIA
<br /> respectively Well S-3 also contained 14 ppb 1,2-DCA Wells S-5 and S-6 were not sampled
<br /> during the fourth quarter 2003 sampling event
<br /> RESPONSE TO SJCEHD LETTER
<br /> Waste Oil Investigations
<br /> In correspondence dated October 11, 1996, San Joaquin County Public Health Services,
<br /> Environmental Health Division (SJCPHS/EHD) requested that Shell perform a soil and
<br /> groundwater investigation in the vicinity of the former waste oil tank Specifically,
<br /> SJCPHS/EHD requested that Shell analyze soil samples for cadmium, chromium, lead, nickel,
<br /> zinc, oil and grease, chlorinated hydrocarbons, polychlorinated biphenyls (PCBs),
<br /> pentachlorophenol (PCP), polynuclear aromatics (PNAs), and creosote SJCPHS/EHD further
<br /> requested that these constituents also be analyzed in groundwater, if detected in soil
<br /> During the April 1997 site investigation, Enviros dnlled a soil boring (SB-2) in the vicinity of the
<br /> former waste oil tank In accordance with Enviros' December 23, 1996 Site Investigation Work
<br /> Plan, which was approved by SJCPHS/EHD on December 30, 1996, soil and groundwater
<br /> samples from this boring were analyzed for cadmium, chromium, lead, nickel, zinc, oil and
<br /> grease, HVOCs (which include chlorinated hydrocarbons), and SVOCs (which include PCP and
<br /> PNAs) Note that PCB and creosote analyses were not conducted The soil samples from SB-2
<br /> contained detectable concentrations of chromium, lead, nickel, zinc, and oil and grease No
<br /> chlorinated hydrocarbons, PNAs, or PCP were detected in soil The groundwater sample from
<br /> SB-2 contained detectable concentrations of chronuum, nickel, zinc, and naphthalene No
<br /> chlorinated hydrocarbons, PNAs other than naphthalene, or PCP were detected in groundwater
<br /> SJCEHD requested additional waste oil analyses in the September 20, 2002 letter, which also
<br /> requested a submittal of a work plan In Cambria's November 19, 2002 Response Letter/Sate
<br /> Conceptual Model/Site Investigation Work Plan, we proposed analyzing groundwater samples
<br /> from well S-3, located approximately 20 feet from the former waste oil tank, for naphthalene,
<br /> PCBs, and creosote to complete the waste oil investigation at the site In the January 8, 2003
<br /> letter, which approved the work plan, SJCEHD requested that groundwater samples from the
<br /> waste oil UST area also be analyzed for dissolved metals (cadmium, chromium, lead, nickel, and
<br /> zinc) as some previous samples exceeded maximum contaminant levels (MCLS)
<br /> Therefore, samples from well S-3 were analyzed for naphthalene, PCBs, creosote, and dissolved
<br /> . metals for two quarters (second and third quarters 2003) No cadmium, chromium, lead,
<br /> 0943 4
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