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Work Plan for Additional Assessment S � <br /> ARCO Service Station No.2133 and Chevron Service Station No.9-4275 <br /> Stockton,California <br /> Page 2 <br /> PROPOSED SCOPE OF WORK <br /> The proposed scope of work included in this work plan consists of: <br /> • Locating and properly abandoning ARCO's offsite groundwater monitoring well MW-4. <br /> • Drilling and installing one groundwater monitoring well MW-10 to approximately 20 feet <br /> bgs north of Chevron's facility. <br /> • Collecting soil samples during the drilling of the monitoring well. <br /> • Develop and sample the newly installed monitoring well. <br /> • Surveying all groundwater and vapor extraction wells on both sites. <br /> SITE ASSESSMENT <br /> Task 1 - Preliminary Field Activities <br /> Health and Safety Plan <br /> As required by the Occupational Health and Safety Administration (OSHA) "Hazardous Waste <br /> Operations and Emergency Response" guidelines (29 CFR 1910.120), and by California <br /> Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and <br /> Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR will prepare a site <br /> specific Health and Safety Plan (HASP). At a minimum, the HASP will define the proposed <br /> subsurface investigation activities, describe physical and chemical hazards that may be <br /> associated with the work, provide a map to the nearest emergency medical facility, and include <br /> material safety data sheets (MSDS) for any hazardous chemicals that will be used or produced <br /> during the work. A copy of the HASP will be available onsite at all times during field work. The <br /> field staff and contractors performing field activities will review the HASP prior to beginning field € <br /> operations, as described in this work plan, at the site. <br /> Permitting <br /> The required monitoring well installation and abandonment permits (Attachment C) will be <br /> obtained from San Joaquin County Environmental Health Department(SJCEHD). <br /> Borehole Clearance Activities <br /> All boring locations will be marked with white paint and Underground Service Alert (USA) will be <br /> notified at least 48 hours in advance of drilling. USA will be notified to identify any public utility <br /> alignments that may be in conflict with the proposed borings. In conjunction with the USA, a <br /> private utility locating company will be utilized for clearing proposed boring locations for <br /> underground utilities. Boring locations will be cleared by hand to at least eight feet bgs before <br /> machine drilling is initiated. <br /> Task 2 —Groundwater Monitoring Well Location and Abandonment <br /> SECOR will supervise a California licensed surveyor in order to locate a monitoring well (MW-4) <br /> which has been paved over. The well will be located using the northing, easting, latitude, and <br /> longitude coordinates from the survey conducted by Morrow Survey Land Surveyors dated July <br /> 31, 2006. Once MW-4 is located SECOR will supervise a California licensed drilling company <br /> abandon the well, following the California Well Standards bulletin 74-90 Part III, Section 19 and <br /> 23 and San Joaquin County Well Standards. The well will be pressure grouted from total depth <br /> to approximately ground surface using neat cement. Prior to pressure grouting the upper five <br /> feet of the well casing will be overdrilled. The drilling contractor will remove each traffic rated <br />