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VON,- lei { method has been accepted by the :egicnal ::rater Quality Control Scard for sampling and chemical analyses cf soils at other F+ lccations in San Joaquin 'Ccunty. Soil samples were collected at 5 foot intervals, beginning at 5 feet, through a depth of 95 ft, with the sampler inserted t� hydraulically after drilling tool removal, Uu on retrieval, soil samples were described by an ESE field geologist for lithology and color. Fricr to sanDle submission for chemical Is and physical analyses, soil samples were screened with a model ,.a HNu photo-ionization detector (PID) to determine the presence of volatile organic compounds (VOCs) . The PID was calibrated as per manufacturer' s directions. Subsamples were then iA submitted at appropriate intervals for laboratory analyses, based on recommendations of the ESE field geologist, and general concordance with An=,euser-Susch ' s field representative. . ,� The borehole was completed as a ground water monitor well, as shorn in Figure 4-2, and described in Table 4-1 . The S5' ft borehole was backfilled through a depth of 76 ft with bentonite prior to monitor well completion. Decisions to screen discrete intervals .64 were based on an attempt to intercept presumed ,,ater bearing strata at an interval coincident with highest PxD detector readings. Prior to sampling, the well was developed by purging five well plus drilling fluid volumes. DeveloDment water was periodically k' monitored for pH and electrical conductivity, and drummed `. 1 i.. onsite for ultimate disposal pending analytical results. I A ground water sample was collected immediately after a. developme;.c'. Upon collection, this sample, as well as previously collected soil samples, were stor,.ad on ice. Following completion of sampling, the water and soil samples ti were delivered by the field geologist *o A.n1ab, Sacramento, 4-3