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SECOR www secor conn <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916 861 0400 TEL <br /> 916-861-0430 FAx <br /> 1 <br /> August 25, 2003 Lq <br /> AUG 2 6 2003 <br /> Mr Michael Infurna ENVIRUN,MENT HEALTH <br /> San Joaquin County Public Health Services PERMIT/SERVICES <br /> Environmental Health Division <br /> 304 East Webber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Re Addendum to Work Plan for Additional Offsite Assessment Dated June 27, 2002 <br /> ConocoPhillips <br /> Tosco Service Station No 4409 <br /> 1502 EI Dorado Street 4� <br /> Stockton, California <br /> SECOR Project No 77TO 64409 01 0106 <br /> Y <br /> Dear Mr Infurna <br /> SECOR International Incorporated (SECOR) has prepared this letter on behalf of ConocoPhillips to <br /> present an addendum to Work Plan for Additional Offsite Assessment dated June 27, 2002 for the <br /> site referenced above (Figure 1) During recent drilling activities at the site as outlined in the work <br /> plan, the well casing in MW-12 (located south of the site in the sidewalk adjacent to Autozone) <br /> melted, thereby restricting access to the well Cascade Drilling attempted to repair the well by <br /> digging around the well head and locating how far down the well casing had melted Cascade Drilling <br /> was unable to determine the extent of the damage to the well and has decided to overdrill the existing <br /> well and reinstall MW-12 in the borehole The addendum is being submitted to document procedures <br /> for reinstalling well MW-12 This addendum includes a brief discussion of proposed scope of work <br /> and schedule <br /> SCOPE OF WORK <br /> The scope of work included in this addendum is the overdrilling and abandonment of existing well <br /> MW-12 due to a melted well casing and the reinstallation of well MW-12 in the borehole The existing <br /> well location is illustrated on Figure 1 The specific scopes of work are discussed below <br /> • Health and Safety Plan As required by the Occupational Health and Safety � <br /> Administration (OSHA) Standard "Hazardous Waste Operations and Emergency <br /> Response" guidelines (29 CFR 1910 120), and by California Occupational Health <br /> and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and <br /> Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR has ° <br /> previously prepared a site-specific Health and Safety Plan (HASP) that was <br /> submitted in the Work Plan for Additional Offsite Assessment dated June 27, <br /> 2002 Field staff and contractors will review the HASP before beginning field <br /> operations at the site <br /> • PermittingThe applicable pp permit for abandoning and reinstalling a <br /> groundwater monitoring well will be obtained from San Joaquin County a <br /> . Environmental Health Department The well abandon ment/installation permit <br /> and applicable fees are included as Attachment A The City of Stockton Public <br /> Works Department previously issued a Revocable Permit (# 03-04W) and <br />