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Revised Work Plan For Soil and Groundwater Assessment S <br /> Ranch Market 23569 South Santa Fe Road Riverbank California April 25,2000 <br /> samples collected at 60, 100, and 140 feet bgs will be retained for analyses. The soil samples <br /> will be analyzed for BTEX; TPHg; and MtBE, using EPA method 8260 B. Water samples will <br /> be analyzed for BTEX; TPHg; Oxygenates including, MtBE, TBA, DIPE, ETBE, and TAME; <br /> and fuel additives 1,2-DCA and EDB using EPA method 8260 B. <br /> The soil borings will be tremie grouted back to grade using neat cement. While grouting, above <br /> 30 feet bgs, the hollow stem augers will removed as the grout rises in the boring. <br /> Phase 1-Direct Push Soil Borings <br /> SECOR will supervise the drilling of three soil borings at the locations shown on Figure 2 <br /> using a truck-mounted direct push dual-cased rig. A hand auger will be used in the upper four <br /> feet of each soil boring to avoid damage to underground utility lines. The soil borings will be <br /> drilled to 45 feet bgs and soil samples will be collected at five foot intervals starting at 10 feet <br /> bgs using an 18-inch long sampling sleeve. Due to presence of heaving sands, a rig equipped <br /> with a dual casing will be used to insure the soil samples will be collected from undisturbed <br /> soil. <br /> Downhole drilling equipment will be steam cleaned before drilling each borehole and sampling <br /> equipment will be cleaned between each sampling interval. Each soil sample will be screened <br /> for hydrocarbon vapors using a portable photoionization detector(PID). Soils encountered <br /> during drilling will be logged using the Unified Soil Classification System by a SECOR field <br /> scientist,working under the supervision of a California registered geologist. Any drill cuttings <br /> generated will be stored on visqueen and all decon water will be stored in DOT approved 55- <br /> gallon drums pending profiling and offsite disposal. <br /> Sample sleeves will be sealed with tape and caps; labeled with the boring number, depth, date, <br /> and site location; placed in an insulated container on ice; and transported under standard <br /> chain-of-custody procedures to Kiff Laboratories, Inc. located in Davis, California. Six (6) soil <br /> samples from each soil boring will be analyzed for BTEX,MtBE, and TPHg using EPA method <br /> 8260B. <br /> The direct push soil borings will be treime grouted back to grade as the outer casing is drawn <br /> from the boring. <br /> filc:nG pmb&WeumtW <br />