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C ft y+1k0ii dEN TAI HEALTH <br /> B R I A 1 1 "-SIT SF[?VdrF' <br /> 03 JUN 30 AN tU: 53 <br /> June 27,2003 <br /> Mr Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Street,Third Floor <br /> Stockton, California 95202 <br /> Re Site Investigation Work Plan/Response Letter )� �01 <br /> � r''�) <br /> Shell-branded Service Station �+ <br /> 2494 East Fremont Street �IS <br /> Stockton, California <br /> SAP Code 136141 <br /> Incident No 98996181 <br /> SJCPHS Site 506171 <br /> Dear Mr Infurna <br /> Cambria Environmental Technology, Inc (Cambria) prepared this work plan/response letter on <br /> behalf of Equilon Enterprises, LLC dba Shell Oil Products US (Shell) This letter responds to <br /> the San Joaquin County Environmental Health Department (SJCEHD) May 21, 2003 letter <br /> directing Shell to prepare a work plan to delineate the vertical and lateral extent of methanol and <br /> 1,2-dichloroethane (1,2-DCA) beneath the site The work plan presented below is written to <br /> comply with SJCEHD and Regional Water Quality Control Board (RWQCB)guidelines <br /> A complete site background for this site is contained in the site investigation report issued <br /> March 6, 2003 The location of the subject site is shown on Figure 1 and the site layout is shown <br /> on Figure 2 <br /> METHANOL AND 1,2-DCA <br /> Both methanol and 1,2-DCA have been detected in groundwater samples collected from wells <br /> and borings at this site There is currently no California or Federal maximum contaminant level <br /> (MCL)drinking water standard for methanol The only regulatory levels set for methanol are the <br /> Oakland CA US EPA IRIS reference dose regulatory level (3,500 parts per billion [ppb]) and a taste and odor <br /> So no rn a CA threshold of 740,000 ppb The primary MCL for 1,2-DCA is 0 5 ppb <br /> Portland 0R <br /> S e a t t I e w A Methanol. Methanol most recently was detected in newly installed wells 5-1-85 and S-3-84 at <br /> Cambriaconcentrations of 5,600 and 4,300 parts per billion (ppb), respectively (Table 1) Methanol was <br /> Environmental not detected in the groundwater sample collected from well 54-83 Previous methanol analyses <br /> Technology,Inc performed on groundwater samples from wells S-1, S-2, S-3, and S-4 indicated that methanol is <br /> O"kins Street <br /> not present in the shallow groundwater beneath the site Grab groundwater samples collected <br /> P 0 Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />