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i <br /> SECOR www secorcom <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 96670 <br /> 918-861-0400 TEL <br /> �. 916-e61-0430 FAx <br /> August 12, 2004 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue <br /> Stockton, California <br /> RE Work Plan for Well Installation <br /> Former 76 Service Station 4409 <br /> 1502 North EI Dorado Street <br /> Stockton, California <br /> SECOR Project No 77CP 64409 03 0001 <br /> Dear Mr Infurna <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of ConocoPhillips, <br /> presents a work plan for the installation of three monitoring wells at the subject site (Figures 1) The <br /> purpose of the proposed work is to install three deep monitoring wells to monitor the vertical extent of <br /> petroleum hydrocarbons in groundwater beneath the site This letter provides proposed scope of <br /> work and schedule This work plan is being submitted based on the results of recent vertical <br /> assessment and recommendations from Results of Vertical Assessment and Updated Site <br /> Conceptual Model dated August 4, 2004 and in response to the San Joaquin County Environmental <br /> . Health Department(SJCEHD) letter dated March 25, 2004 (Attachment A) <br /> PROPOSED SCOPE OF WORK <br /> The scope of work for this site assessment will include the drilling and installation of three <br /> groundwater monitoring wells to a depth of 120 feet below ground surface (bgs), onsite (Figure 1) <br /> The specific scope of work is discussed below <br /> Site Specific Health and Safety Plan As required by the Occupational Health and Safety <br /> Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" <br /> guidelines (29 CFR 1910 120), and by California Occupational Health and Safety Administration <br /> (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, <br /> Section 5192), SECOR will prepare a Site-Specific Health and Safety Plan prior to the <br /> commencement of fieldwork The Site-Specific Health and Safety Plan will be reviewed by the field <br /> staff and contractors before beginning field operations at the site <br /> Permitting Groundwater monitoring well installation permits and soil boring permits will be obtained 3 <br /> from SJCEHD prior to initiating work ' <br /> Deep Well Installation Three groundwater monitoring wells will be installed at the location shown f <br /> on Figure 1 Groundwater is anticipated to be encountered at approximately 30 feet below ground <br /> surface (bgs) The soil boring will be drilled using an air rotary casing hammer drill rig equipped with <br /> 10-inch diameter heavy-walled downhole casing The casing hammer will be advanced following the <br /> drill rods in order to seal the upper groundwater bearing zone from the lower groundwater bearing <br /> zone Upon completion of drilling, a 4-inch diameter groundwater monitoring well will be installed in <br /> the boring The well will be screened with 4-inch diameter, flush-threaded, Schedule 40 PVC casing <br /> with 0 020-inch factory-slotted screen within a sand zone The wells will be installed from 120 feet <br /> 3 <br /> i <br />