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29 September 2003 <br /> AGE-NC Project No. 01-0865 <br /> Page 2 of 10 <br /> Each of these tasks is described in greater detail below. <br /> 3.1. PRE-FIELD WORK PREPARATIONS <br /> A site assessment boring permit will be obtained from the San Joaquin County Environmental Health <br /> Department (EHD) for all on- and off-site boring locations and encroachment permit(s) will be <br /> obtained from the County Public Works Department. A health and safety plan will be updated in <br /> accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site <br /> Activities(National Institute for Occupational Safety and Health Administration,U.S. Coast Guard <br /> and U.S.Environmental Protection Agency, 1985).Prior to mobilization,the area of excavation will <br /> be clearly marked and a utility clearance obtained through Underground Service Alert. <br /> 3.2. CONE PENETROMETER TEST (CPT) <br /> AGE proposes to advance four paired CPT soil borings at the site (Figure 2) as part of site <br /> assessment activities to characterize lithology, potential contaminant migration pathways and to <br /> assess the vertical extent of petroleum hydrocarbon-impacted ground water. <br /> 3.2.1. CPT Boring Locations <br /> The proposed boring locations are: <br /> • Adjacent to ground water monitoring well MW-6,to further delineate vertical ground water <br /> contamination directly down gradient of the former USTs; <br /> • Between 10 and 15 feet south of ground water monitoring well MW-5, to further delineate <br /> vertical ground water contamination north of MW-6; <br /> • Between 45 and 50 feet east of ground water monitoring well MW-1, to further delineate <br /> vertical ground water contamination at the former UST locations; and <br /> • Between 55 and 60 feet south of ground water monitoring well MW-6, to delineate vertical <br /> ground water contamination at the southern portion of the property. <br /> The CPT borings shall be advanced to approximately 100 feet bsg(120 feet bsg for the CPT on the <br /> levee) utilizing a 25-ton truck-mounted CPT drill rig equipped with 2-inch diameter hollow-stem <br /> rods; however, total depth of the boring may vary according to geologic conditions and field <br /> evidence of impacted media encountered during boring advancement. <br /> Adv eed GeoEnvironmental,Inc <br />