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Julian Munoz `t <br /> 10 August 1987 2 WEISSASSOCIATES <br /> gravel removed from the tank pit was odorous and slightly stained but no <br /> hydrocarbon-stained soils were evident along the excavation walls. <br /> Since ground water was encountered in the tank pit, Mr. Wilson stated <br /> that only a sample of the water found in the tank excavation would be <br /> necessary to satisfy SJLHD and California Regional Water Quality Control Board <br /> - Central Valley Region (WQCB) requirements and that no soil samples from <br /> beneath the tanks were required. Water samples TP-W-1 and TP-W-1P were <br /> collected from the open excavation, decanted into 40-ml glass vials, labeled <br /> and transported under chain-of-custody procedures to Brown and Caldwell <br /> Analytical Laboratories of Emeryville, California (B&C) . Mr. Wilson witnessed <br /> the sampling and inspected the glass vials for trapped air. Copies of <br /> chain-of-custody forms are included as Attachment A. <br /> ANALYTIC RESULTS <br /> Water sample TP-W-1 was analyzed by B&C for total fuel hydrocarbons <br /> (TFHC) by EPA Method 8015, gas chromatography/flame ionization detection <br /> (GC/FID) and for benzene, toluene and xylenes (BTX) , by EPA Method 602. <br /> GC/FID has a detection limit of 1 part per million (ppm) and EPA Method 602 <br /> has a detection limit of 0.2 parts per billion (ppb) . Xylenes were detected <br /> in water sample TP-W-1 at 1.1 ppb. A copy of the analytic report is included <br /> as Attachment B. <br /> MONITORING WELL INSTALLATION <br /> As we have discussed, monitoring well installation is scheduled to begin <br /> on 12 August 1987. The well installation detailed in our correspondence dated <br />