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Quik Stop Station No 039 October 27, 1999 <br /> Stockton California _ _ _ PSA Work Plan, <br /> TBA, methanol, and ethanol by EPA Method 8260B or total Lead by EPA <br /> Method 6010 should not be necessary for soil samples collected during this <br /> assessment However, if any of the selected soil samples have detectable <br /> concentrations of MTBE, then the soil sample with the highest MTBE <br /> concentration will be analyzed by modified EPA Method 8260B to confirm <br /> MTBE The soil samples collected from the boring located near the <br /> southwest corner of the former UST pit will also be analyzed by the <br /> laboratory for the presence of TOG by EPA Method 5520, and TPHmo and <br /> Total Petroleum Hydrocarbons as diesel (TPHd) by modified EPA Method <br /> 8015 Chain-of-Custody protocol will be followed for all soil samples <br /> submitted for analysis <br /> Task 3 Develop and sample the newly installed monitoring wells in accordance with <br /> Horizon's Field Methods and Procedures in Appendix B The groundwater <br /> samples collected from monitoring wells MW-1, MW-2 and MW-3 will be <br /> analyzed for TPHg, BTEX, and MTBE by modified EPA Methods 8015 and <br /> 8020 The groundwater samples collected from the monitoring g well located <br /> near the southwest corner of the former UST pit will also be analyzed by the <br /> laboratory for the presence of TPHmo and TPHd by modified EPA Method <br /> 8015 and TOG by EPA Method 5520 Cham-of-Custody protocol will be <br /> followed for all water samples submitted for analysis The monitoring wells <br /> will be surveyed to an arbitrary datum referenced to mean sea level (msl) <br /> Task 4 Prepare and submit a Preliminary Site Assessment Report detailing field <br /> methods, results, and conclusions of the site assessment to date <br /> I <br /> 7039-12 wp 5 HORIZON ENVIRONMENTAL INC <br />