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