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ss <br /> . 28 July 2004 <br /> AGE-NC Project No 99-0657 <br /> Page 2 of 7 <br /> Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) and is on file <br /> with the EHD and will be revised as necessary Prior to mobilization, the area of excavation will be <br /> clearly marked and a utility clearance obtained through Underground Service Alert <br /> 2 2 MONITORING WELL PILOT BORING ADVANCEMENT AND SAMPLING <br /> Based on ground water contamination encountered at the site, AGE proposes Installation of <br /> additional ground water monitoring wells to continue assessment and confirm lateral and vertical <br /> definition of the petroleum hydrocarbon-Impacted ground water in the following locations <br /> • A deep-zone well approximately 5 feet east of well MW-1, <br /> • A deep-zone well approximately 5 feet south of well MW-6, <br /> • A first ground water well at the southwestern-most corner of the site, <br /> • A first ground water well approximately 80 feet west-southwest of well MW-6, adjacent to <br /> the carport in the driveway at the Mentage apartment complex, and <br /> i • A first ground water well approximately 100 feet southwest of the southwest corner of the <br /> site, on the service road at the Mentage apartment complex <br /> The proposed first ground water monitoring well pilot bonngs will be advanced to approximately <br /> 50 feet below surface grade (bsg) and the deep-zone pilot borings to approximately 130 feet bsg, <br /> utilizing a truck-mounted,hollow stem drill ng equipped with 8-Inch diameter hollow-stem augers <br /> Total depths of borings may vary according to hydrogeologic/geologic conditions encountered during <br /> drilling Procedures for monitoring well pilot boring advancement are presented in Section 3 1 <br /> 2 2 1 Soil Collection and Analyses <br /> As the borings are advanced,soil samples will be collected at 5-foot Intervals beginning at 5 feet bsg <br /> and extending to the total soil boring depth Field procedures for advancement of the soil boring and <br /> collection of soil samples are presented in Section 3 1 <br /> Selected soil samples from the five soil borings will be submitted for laboratory analysis, samples <br /> will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory <br /> for the following constituents <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified, and <br /> Advanced GeoEnvironmental,Inc <br />