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a +1 <br /> • 33� <br /> CLEARWATER <br /> G R O U P <br /> Environmental Services <br /> DrillDrillmz and installation of dual-phasea12oin <br /> Proposed drilling <br /> Clearwater proposes the drilling of two boreholes for the installation of a dual-phase test well and air <br /> sparge point in the location of the known highest concentrations of dissolved-phase contaminants, near <br /> MW-513 (Figure 1) Prior to drilling of the boreholes, permits will be obtained from the San Joaquin <br /> County Public Health Services and the site will be marked by Underground Service Alert (USA) to <br /> identify utilities leading to the site Clearwater and drilling subcontractor personnel will also review <br /> and sign a Site Safety Plan <br /> The boreholes will be drilled using a truck-mounted drill-rig equipped with eight and ten-inch <br /> diameter hollow-stem augers (10-inch auger for 4-inch well and 8-inch auger for 2-inch sparge point) <br /> Drilling will be performed by a C-57 licensed driller under the supervision of a Clearwater geologist <br /> During drilling, soil samples will be collected at five-foot intervals for sedimentologic verification <br /> purposes only Soil types will be documented, as well as depth to groundwater Soil samples will be <br /> collected in accordance with local regulatory guidelines and Clearwater's Field Protocols Soil samples <br /> will be screened for the presence of volatile organic compounds (VOCs)with a Photovac 2020 or similar <br /> photo-ionization detector (PID) <br /> Augers will be cleaned between each boring with a steam cleaner and samplers will be cleaned in an <br /> Alconox®wash followed by double rinsing in clean tap water Soil cuttings and auger/sampler rinseate <br /> will be stored in labeled 55-gallon drums on-site pending appropriate disposal Clearwater will <br /> utilize the analytical results for soil and/or water samples collected from the borings to coordinate soil <br /> and water recycling/disposal All fieldwork will be conducted in accordance with Clearwater's Field <br /> Protocols attached <br /> Proposed dual-phase test well installation <br /> Clearwater propose to supervise the installation a 4-inch internal diameter well at least 10 feet below <br /> the maximum recorded water table depth- for the site (approximately 14 feet bgl) in one of the <br /> boreholes to be used for both groundwater extraction testing and soil vapor extraction testing It is <br /> assumed the well will not be installed past a depth of approximately 30 feet bgs, however, final well <br /> construction will depend can hydrogeologic observations made at the time of drilling The proposed <br /> ZB178C Workplan for remedial feasibility testing 6 Aitgttst 2001 <br />