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PACIFIC <br /> 'ENVIRONMENTAL <br /> GROUP INC <br /> '98 _IJL AtIN ' 3S <br /> July 9, 1998 <br /> Project 911-005 1B <br /> Mr Ed Ralston <br /> 1380 Leadhill Road <br /> Suite 120 <br /> Roseville, CA 95661 <br /> Re Change in Scope of Work + <br /> Circle K Service Station#1205 <br /> 16470 Cambridge Street <br /> Lathrop, California <br /> Dear Mr Ralston <br /> This letter, prepared by Pacific Environmental Group, Inc (PEG) on behalf of Tosco <br /> Marketing Company (Tosco), presents a change in the scope of work to the PEG Work <br /> Plan for Additional Site Assessment dated June 10, 1998 This change is made in <br /> response to a letter from Mr Michael J Infurna Jr of the San Joaquin County Public <br /> Health Services-Environmental Health Division (SJCPHS-EHD) dated July 2, 1998 <br /> (Attachment A) <br /> SCOPE OF WORK <br /> The specific changes to the scope of work are discussed below <br /> Soil Selection and Analysis. Soil samples will be collected every <br /> five vertical feet in the borings A continuous core sample will be <br /> collected from the GeoprobeO boring to evaluate geological <br /> conditions on site Soil samples will be selected by site personnel ' <br /> based on PID or FID`values, odor, discoloration, or other anomalous <br /> site conditions Selected soil samples will be submitted to a <br /> California State-certified laboratory and analyzed for the presence of <br /> TPH-g and benzene, toluene, ethylbenzene, xylenes (BTEX) by EPA <br /> Methods 8015 modified and 8020 Additionally, if necessary, one <br /> soil sample from each boring will be analyzed for the presence of <br /> methanol and ethanol by EPA Method 8015 modified and fuel <br /> oxygenates (TBA, MtBE, DIPS, ETBE, and TAME) by EPA Method <br /> 8260 Furthermore,two selected samples, one from the Geoprobe0 <br /> boring and one from a monitoring well boring, will be analyzed for <br /> physical parameters <br /> 11315 Sunrise Cold Circle, Suite M, Rancho Cordova, California 95742 (916)858-2350 FAX (916) 858-2355 J �� <br />