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.� n i•. .. method has been accepted by the Regional Water Quality Control Beard for sampling and chemical analyses of soils at other locations in San Joaquin County. Soil samples were collected at 5 foot intervals, beginning at 5 feet, through a depth of 95 ft, with the sampler inserted hydraulically after drilling tool removal. [Upon retrieval, soil samples were described by an ESE field geologist for lithology and color. Prior to sample submission for chemical and physical analyses, scil samples were screened with a model HNu Fhotoionization detector (PID) to determine the presence of volatile organic compounds (VOCs ) . The PID was calibrated as per manufacturer': directions. Subsamples were then:. submitted at appropriate intervals for laboratory analyses, based er: recommendaticns of the ESE field geologist, and general "concordance with Anheuser-Busch ' s field r: representative. ;. The borehole was completed as a ground water moAitor well, as • s shown in Figure 4-2, and described in Table 4-1 . The 95 ft borehole was backfilled through a depth of 76 ft with bentonite prior to monitor well completion. Decisions, to screen discrete intervals were- based on an at•. empt tc intercept presumed water bearing strata at an ' interval coincident with highest P1L':" detector readings., Prior to sampling, the well was developed by purging five well plus drilling fluid volumes. Development water was periodically monitored for pH and electrical conductivity, and drummed onsite for ultimate disposal pending analytical rzsults. A grouid water sample was collected immediately after development. Upon collection, this sample, as well as previously collected soil samples, were stored on ice. Following r_omplet�.on of sampling, thie Water and soil samples b , were delivered the field � . " l geologist �o Anlab, Sacramento, f 4-3 v- 1 9'