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SECOR <br /> . International Incorporated <br /> September 21, 2000 <br /> Project 077 42070 310 <br /> Mr Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Re Addendum to Work Plan foi Additional Site Assessment <br /> dated August I6, 2000 <br /> ARCO Station #6020 <br /> 1711 E Yosemite Avenue <br /> Manteca, California <br /> Dear Mr Infurna <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of Atlantic <br /> Richfield Company (ARCO), presents an addendum to the Wolk f'lcm fol Addmotla0ae <br /> Assessment, dated August 16, 2000, which proposed the installation of four groundwater <br /> monitoring wells at the subject site (Figures I and 2) This addendum has been prepared in <br /> response to San Joaquin County Environmental Health Department's (SJCEHD) letter, <br /> dated September 7 2000 (Attachment A), requesting additional investigation n1 the <br /> immediate areas of the dispensers and underground storage tanks (USTs) <br /> Per the request of SJCEHD, two monitoring wells will be added to the scope of work <br /> proposed in the Werk Plan fol Additional Site Assessrtlent, dated August 16, 2000 The <br /> additional wells will be located north of the UST complex and west of the dispenser islands <br /> (Figure 2) These borings will be di tiled as close to the areas of the dispensers and USTs <br /> as possible to evaluate the presence and extent of hydrocarbons in soil previously reported <br /> by the IT Group in their report Ovet-exc.awillott ctnd,So11,Sctm1)1 g crsswc,lctled with the <br /> Ilehlcice►awni of Uncletgtolutd Sloiage kinks, P►oduct Delluety L►ties emd Di%l.)ettsers <br /> (August 28, 2000) <br /> The field (including soil and groundwater sampling) and laboratory procedures described to <br /> the previously submitted Wolk Plan for AddlltonalSite Assessmet►t will apply to the <br /> installation of the two additional proposed monitoring wells A well permit application is <br /> included as Attachment B <br /> SECOR is prepared to initiate field work within 2 weeks following approval of this work <br /> plan addendum and issuance of permits by the SJCEHD A report documenting the <br /> findings of this assessment is anticipated to be submitted approximately 6 to 8 weeks after <br /> the completion of the field work and receipt of all laboratory results <br /> • <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916861 0400 916861 04301-ix www sec orcom <br />