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.i <br /> DeBoer Truck Lines, Inc. i! <br /> 201 West Sth Street, Ripon, California September 9, 1994 <br /> Phase I Report of Findings Page: ;;2 <br /> li <br /> ii <br /> 3.0 Scope of Work it <br /> f <br /> "-' On June 30, 1994, W1IE, Inc. drilled three (3) soil borings and complete each as <br /> F groundwater monitoring well. The wells are located in the area of the former <br /> underground tanks (Figure 2) and were used to determine the groundwater gradient and <br /> help in the definition of soil and groundwater contamination. <br /> Laboratory soil samples were taken from all borings at five foot intervals including the <br /> capillary fringe. Three soil samples from each boring were selected for analysis by the <br /> registered professional based on odor, discoloration and previous findings in order tq <br /> demonstrate a clean lateral interface. All other samples were held by the laboratory" <br /> pending the results of the first samples. <br /> i. <br /> 4 <br /> 3.1 Drilling <br /> . r <br /> i <br /> Permits were obtained as necessary for all wells (including borings) before drilling <br /> begins. The soil borings were accomplished using a mobile mounted drilling rig <br /> employing the use of a hollow stem flight auger of 6 7/8 inch o.d. <br /> All drilling equipment was thoroughly steam-cleaned before drilling began to <br /> prevent the introduction of contamination from off site, and between borings to: <br /> prevent cross contamination. <br /> The borings were logged under the direct supervision of a registered professional <br /> using the Unified Soil Classification System (Appendix E). The color, texture,;; <br /> moisture, plasticity (if applical0le), co-9sistency of the earth materials, pertinent soil° <br /> or bedrock characteristics, and any evidence of contamination were noted. All <br /> water-bearing zones and the depths at which they were encountered were.also <br /> noted on these logs. Upon termination, the borings into the saturated zone were <br /> completed as monitoring wells and backfilled with concrete grout, after al ' <br /> Bentonite seal had been placed. <br /> The cuttings from the drilling operation were stockpiled on-site with the soil from'' <br /> the former tank excavation. !I <br /> 3.2 Well Construction <br /> r <br /> All materials used in well .construction were thoroughly cleaned prior to <br /> introduction into the boring. A 2- inch diameter PVC well casing with end cap and <br /> factory perforations for placement in the saturated zone (taking into account::.; <br /> seasonal variation) was placed in the boring. The screen and filter pack sizes are.1I <br /> as noted on the well completion logs (Appendix Q. The casing and end caps were ii <br /> ii <br /> �I <br />