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Geo(ogical7ecFinics 2nc. • Page 5 <br /> Phase IIA ESA Report <br /> Bank of Stockton(aort Way) <br /> Project No. 827.2 <br /> November 15, 1999 <br /> 3.0 WATER WELL ANALYSIS <br /> Two water samples were collected from the production well used by Suprema. One sample <br /> was collected on November 2 and the other on November 10, 1999. These samples were <br /> submitted to BSK Laboratory in Fresno tested for the following: <br /> ■ VOCs by method 524.2 <br /> ■ DBCP by method 504.2 <br /> ■ Nitrate by 300.0 <br /> The test results are summarized below in Table 3 and are attached in Appendix A. <br /> Table 3: Water Well Sample Analytical Data -November 2 & 10, 1999 <br /> vu� s urate <br /> method 524.2 method 504.1 method 504.1 method 300.0 <br /> t_(198-03-04) <br /> g ep pg Ag 99 rn <br /> ction e <br /> < , _ < . < <br /> The test results show that volatile organic compounds (VOCs) by method 524.2 and DBCP <br /> and EDB by method 504.1 are not present in the water sample from the well used by <br /> Suprema. Nitrate was found at 27 mg/L. <br /> 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Conclusions <br /> The following conclusions are drawn form the data gathered during this investigation: <br /> Former UST Sites <br /> 1. Except for a trace amount of Toluene in GP 1-20 foot sample, all of the samples were <br /> non-detect for the petroleum hydrocarbon compounds samples analyzed for. <br /> 2. No evidence of soil staining or hydrocarbon odors was observed during field screening <br /> activity. <br /> 3. No evidence was obtained which suggests that a significant release of petroleum <br /> hydrocarbons occurred in the two former UST locations. <br /> 4. The fact that sample analysis from the 10 to 20 feet bgs, there is a low permeable clay <br /> layer which did not detect any of these chemicals, shows that a significant release of fuels <br /> did not occur adjacent to these boreholes. If a significant release had occurred the fuels <br /> would have migrated laterally along this layer and we would have detected it in the <br /> samples from 15 and 20 feet. <br /> Truck Maintenance Shop Area <br /> 1. All of the samples were non-detect for the Gasoline, Diesel, and Motor Oil compounds <br /> and Purgeable Halocarbons (i.e., solvents) samples analyzed for. <br /> 2. The five metals tested for are within concentrations expected for this soil type. <br /> 3. No evidence of soil staining or hydrocarbon odors was observed during field screening <br /> activity. <br />