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JUL-08-2004 12:42 CRMBRIR <br /> M <br /> C A M B R I A <br /> BF_ <br /> E <br /> Z o <br /> g <br /> Mr. Mike Infuma —'-- - � sy � , i � �F <br /> San Joaquin County Environmental Health Department I <br /> 304 Fast Weber Street, Third Floor $ 01 a w <br /> Stockton,California 95202 Z ;'' o b H <br /> Re: Site Investigation Work Plan - Addendum d <br /> Shell-branded Service Station N" F <br /> ��t1l o E <br /> 2494 East Fremont Street 5�A3 ` S <br /> Stockton, California Wx a q <br /> SAP Code 136141 <br /> Incident No. 98996181 a <br /> SJCPHS Site 506171 3 m m <br /> E m a a c t <br /> Dear Mr. Infurna: 13 0 KN o. . ; <br /> � Q L 17 <br /> Cambria Environmental Technology, Inc. (Cambria) prep: <br /> behalf of Equilon Enterprises, LLC dba Shell Oil Product; <br /> Environmental Health Department's (SJCEHD's) June 17, 2-- <br /> in <br /> ,,in the vicinity of well S-4 would be appropriate to assess the vertical extent of gasoline <br /> constituents onsite. This addendum proposes one additional soil boring be drilled with cone <br /> penetration testing (CPT) equipment at the location shown on Figure 1. The general scope of <br /> work for this boring is the same for the offsite borings proposed in our August 28, 2003 work <br /> plan, and is summarized below. <br /> One additional boring (SB-29) is being proposed in the vicinity of well S-4 to provide vertical <br /> assessment onsite and downgradient of the source area, and in an area of the site that has shown <br /> repeatable 1,2-Dichoroethane (1,2-DCA) concentrations in groundwater in the 73 to 83 foot <br /> depth range. Boring SB-29 will be drilled to I50 feet below grade (fbg). Previous CPT work in <br /> this area has identified a coarse-grained zone at approximately 110 fbg. This zone and any other <br /> coarse-Brained zone identified between 110 and 150 fbg will be targeted for water sample <br /> collection. Groundwater samples collected from this boring will be analyzed for seven fuel <br /> oxygenates and for lead scavengers. This boring will be drilled during the field work scheduled <br /> for July 6 through July 16, 2004. <br /> Previously proposed borings SB-26, SB-27,SB-28 will not be drilled at this time as access to the <br /> cambda property has not been granted. Further investigation north of the site will be proposed in a <br /> Environmental forthcoming revised work plan. <br /> Technology.Inc. <br /> 270 Perkins Street <br /> P.O.Box 259 <br /> Sonoma.CA 95476 <br /> Tel(70T)935-4850 <br /> F..(707)935-6649 <br />