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P <br /> p;\pmj�cl\7.13.075\sawkpl <br /> 1988). Final well locations may differ,based on location of site underground utilities, and <br /> approval of nursery management and San Joaquin County Health Department. <br /> Task 5.Drill And install Three Monitoring Wells-ESE will drill and install three monitoring <br /> wells, located as shown on Figure 2. An ESE field geologist will supervise the proposed <br /> drilling program. He will prepare a geologic field log of soils encountered during drilling. <br /> An ESE California Registered Geologist will review the geologic field logs. <br /> The drilling sub-contractor (driller)will drill the well bores using a hollow-stem-auger drill <br /> rig,with minimum 10-inch outer diameter auger flights. The driller will sample the soil in <br /> each well bore at 5-foot intervals, beginning at 3 feet, to an approximate total depth of 10 <br /> feet below anticipated ground-water depth (total depth, 45 feet). The driller will obtain <br /> the samples by driving a split-spoon or California Modified sampler 18 inches for each <br /> sample attempt, as described in ESE Standard Operations Procedures. The sampler will <br /> be fitted with brass liners to retain the soil. <br /> The ESE field geologist will use the deepest portion of each drive sample, retained in the <br /> drive shoe, for geologic logging and for head-space analysis. The lowest sample retained <br /> in a brass liner will be sealed by covering the ends of the brass liner with Teflon sheeting <br /> and a plastic cap, and kept for analysis. The middle and top samples,if obtained,will be <br /> used for geologic logging of the bore hole. Soil samples not submitted for analysis will be <br /> discarded with the soil cuttings after extrusion from the brass liners. <br /> For those depth intervals from which one soil sample is to be selected, the ESE field <br /> geologist will perform a head-space analysis. Head-space analysis is accomplished by <br /> extruding a soil sample from a brass liner or from the sampler drive shoe for each sample <br /> drive and keeping it in a sealed container (plastic bag) in a warm locon.be iter about <br /> 5 minutes, volatile materials that may be contained in the soil sample <br /> in <br /> the container in sufficient concentration to be measured with a detector, such as a <br /> 4 <br />