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Clayton <br /> Mr.Neal Stidham Page 2 <br /> Shell Oil Products Clayton Project 70-04696 <br /> June 15, 2004 <br /> 3.0 METHODS <br /> 3.1 PRE-FIELD ACTIVITIES <br /> As Shell is the owner of the property,no access agreements will be necessary. Soil <br /> ' boring permits will be obtained for the proposed drilling activities from the San Joaquin <br /> County Environmental Health Department(SJCEHD)prior to fieldwork. Underground <br /> service alert will also be notified as required at least 48 hours prior to commencement of <br /> any subsurface fieldwork. In addition to the USA alert, Clayton will consult with the <br /> operators of the facility for assistance in locating underground utilities at the Site. <br /> A site specific environmental health and safety plan has been prepared for the work, and <br /> is included as Attachment A. This safety plan will be kept onsite during field activities. <br /> 3.2 SOIL BORINGS <br /> Clayton proposes to initially advance approximately 10 Geoprobe boreholes through the <br /> fill and into the native soil. Boring depth will be dependent on fill thickness, and the soil <br /> borings will be terminated immediately below the fill/native interface. Based upon <br /> drilling/well installation from a nearby site, depth to groundwater is anticipated to be <br /> greater than 100 feet; thus, it is not anticipated that groundwater will be encountered <br /> during drilling at the Site. Clayton will contract with a California licensed (C-57) driller <br /> to operate a truck-mounted GeoProbe direct push rig to advance the proposed boreholes. <br /> Soil cores will be obtained using a core barrel sampler,which is approximately 4 feet <br /> long and 2 inches in diameter. The core barrel sampler contains a plastic liner that retains <br /> a relatively undisturbed soil core from which soil samples are collected. <br /> Each borehole will be continuously cored; and soil cores will be logged for lithological <br /> content using the Unified Soil Classification System(USCS) as a guide, and for relative <br /> moisture content, competency, and other observable distinguishing characteristics (for <br /> example: color changes, debris, rootlets, or odor). Several unsaturated-soil samples will <br /> be selected from each borehole and placed into a sealed plastic bag for field screening <br /> using an Organic Vapor Analyzer(OVA)to evaluate for the presence of volatile vapors <br /> that may be released from the soil sample and collect in the headspace of the bag.'Field <br /> observations will be entered into a field notebook or on a borehole-log sheet. Clayton <br /> will evaluate field observations, OVA readings, and olfactory odors to select specific <br /> sample to be submitted for laboratory analysis. <br /> The selected unsaturated-soil samples to be submitted for laboratory analysis will be cut <br /> from each plastic liner, sealed with Teflon tape and plastic end caps, labeled with <br /> ' identifying information, and stored in a chilled ice-chest for transportation to the <br /> SAES\PROMMQO \04696 Shell Trazy Pump Stuion\TmcyStetion WP.doc <br />