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SAMPLE NUMBER DEPTH EPA METHOD 8010 <br /> Trip Blank ND <br /> Note: ND-Not Detected at Method Detection Limits. Laboratory report indicated less than(<) Method Detection Limits <br /> Detection Limits-0.5µg/I <br /> µg/I = micrograms per liter or part per billion <br /> Chloroform was found in all five (5) samples in concentrations level ranging from <br /> 0.89 microgram per liter (µg/1) in boreholes 135 to 3.3 pg/l in borehole 133. This <br /> range of concentration is below the MCL of 100 pg/l for cholorform based on the <br /> California DHS Drinking Water Standards. <br /> 5.4 Data Validation <br /> CRC reviewed the QA/QC data reported by BC Analytical. The information <br /> evaluated included sample holding times, method blanks, matrix spike and surrogate <br /> recoveries, and laboratory control spike recoveries. CRC performed this evaluation <br /> to ascertain that the data reported by the laboratory could be considered accurate and, <br /> therefore, usable for defining the nature and extent of potential contamination at the <br /> site. All QA/QC data appeared to be within acceptable limits and no data were <br /> rejected based on this review. <br /> 6.0 SUMMARY OF FINDINGS, CONCLUSIONS AND RECOMMENDATIONS <br /> 6.1 Summary of Findings <br /> • The subject property is underlain by at least 12 feet of silty, inorganic CL <br /> and an undetermined thickness of sandy to gravelly clay (SC). <br /> • Sampling was conducted down to the saturated zone, and no petroleum <br /> hydrocarbon or VOC contamination, stainings or odors were noted in soil <br /> and groundwater samples. <br /> • Groundwater was measured at a depth of 13.25 feet to 14 feet bgs with a <br /> flow gradient to the north-northeast which appears to conform with the <br /> regional trend. <br /> • No VOCs were detected in the soil samples submitted for analysis. <br /> • Of the EPA 8010 analytes, only chloroform was detected in the five (5) <br /> groundwater samples at concentrations which range from 0.89 pg/l to 3.3 <br /> pg/1. This range of concentration was below the MCL of 100 µg/l for <br /> chloroform. <br /> CRC Environmental Risk Management, Inc. Project#2100-217-2 <br /> American Savings Bank 150 West 10th Street <br /> May 1995 10 Tracy, California <br />