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of the upper spargepoint, across the entire screened interval, and extends approximately 2 feet <br /> • above the top of the screen for the spargepoint. A bentonite seal extends two feet above the sand <br /> pack. Neat cement extends from the bentonite seal to ground surface. The well casing was <br /> topped with a locking cap. The boring logs show well construction details. The well were <br /> developed after completion <br /> A California State Licensed Surveyor surveyed the newly installed wells. The well casings were <br /> surveyed to the nearest OA1 feet in elevation to a known benchmark. <br /> Organic Vapor Procedures <br /> g P <br /> Soil samples collected continuously during drilling were analyzed in the field for ionizable <br /> organic compounds using a photo-ionization detector (PID) with a 10.2 eV lamp. The test <br /> procedure involved measuring approximately 30 grams from an undisturbed soil sample, placing <br /> this subsample in a sealed container (either a zip-lock bag or a mason jar). The container was <br /> warmed for approximately 20 minutes (in the sun), then the head-space within was tested for <br /> total organic vapor, measured in parts per million as benzene (ppm; volumelvolume). The <br />' instrument was calibrated prior to drilling using a 100-ppm isobutylene standard (in air) and a <br /> sensitivity factor of 55, which relates the photo-ionization potential of benzene to that of <br />' isobutylene at 100 ppm. The results of the field-testing were noted on the boring Iogs. <br /> Laboratory Procedures <br /> 10 Collected groundwater samples were analyzed for the presence of TPHg, BTEX, and MtBE using <br /> EPA method 8260. <br /> 1 Soil Cuttings and Rinsate Water <br /> Soil cuttings generated during drilling operations were temporarily stored on site and covered <br /> with plastic sheeting pending characterization and disposal. Contaminated soil cuttings were <br /> removed by a California-certified disposal contractor to an appropriate disposal facility. Water <br /> generated during steam cleaning and development of the new wells was temporarily stored in <br /> DOT-approved 55-gallon drums pending transport by the disposal contractor to an appropriate <br /> disposal or treatment facility. <br /> • A-2 <br />