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r' r Mr. Dave Heinrich August 15, 1989 202/150--4150 Page 2 ` Drilled five soil borings into groundwater and in- stalled five 4-inch diameter PVC monitoring wells to ascertain the groundwater conditions beneath the site (Figure 1 . Soil samples collected during drilling operations were field screened using a photaionization detector (PFD) , and selected samples were sent to a state-certified laboratory for analyses of benzene; toluene, ethyl- benzene and xylenes (BTEX) , and total petroleum hydro- carbon-as-gasoline (TPH-G) concentrations. ` A field geologist continuously logged all soil borings using the Unified Soil Classification system. Subsequent to monitoring well installation, a well- development truck was used to stabilize the wells by removing fine sediments from the well and sand pack. Well-head elevations and locations were professionally surveyed for vertical and horizontal control. ` Water samples were obtained and under a Chain-of- Custody manifest sent to a laboratory for analyses of BTEX and TPH-G. Monitoring wells were gauged monthly for depth to water and thickness of free product. ` A 10 by 20--foot temporary compound was built, in which a 530-gallon polyurethane tank was placed for the storage of free product (Figure 2) . Free product was hand bailed from monitoring well 1 (MW-1) and the recovered product was stored in the storage tank. The appropriate permits have been obtained from the Stockton Fire Department, and a weekly bailing program has been initiated for the site. Preparation of correspondence including detailed maps and additional proposed work steps. soils encountered beneath the site consist predominantly of silt, clay, and clay-silt: mixtures with randomly interbedded sand 14#GROUNDWATER TECHNOLOGY.INC.