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(Teo logical 7ech gics lac. Page 3 ' Groundwater Monitoring Report Project No. 1030.2 May 15,2003 Before a sample was collected, the well's water level was allowed to recharge to at least 80% of its initial level. MW-101 recharged to 75% of its initial level prior to sample ' collection. All water removed from the monitoring well and not used as a sample was placed in a 55 gallon DOT approved container that is properly labeled and temporarily ' stored on-site. A Waterra pump and dedicated tubing were used to collect each sample. Extreme care was exercised while collecting samples to prevent agitation of the water contained in the Waterra pump. With minimal sample aeration, water samples were transferred from the pump into 40-m1 VOA vials preserved with hydrochloric acid or trisodium phosphate. All ' samples were checked for headspace bubbles, labeled, inserted into foam holders and placed into a cooled ice chest for transport to the laboratory. ' The sampling technician wore disposable gloves while collecting all samples. A chain of custody document, listing all samples collected and their intended analyses, accompanied the samples from field to the laboratory, thereby providing a means to track the movement of and ensure the integrity of the samples, 1.3 Groundwater Laboratory Analyses ' Groundwater samples collected on April 18, 2003, were delivered to Sherwood Labs of Hilmar, California(certification#1400) for analyses of: ❑ Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by EPA method 8020 ' ❑ Gasoline Range Organics(TPH-G)by EPA method 8020/8015(M) © MTBE by EPA method 8020 • Positive results were confirmed by EPA method 8260 ' The results of the laboratory analyses are listed in Table 3 of Appendix A. Detection limits and analytical results are presented in Appendix B. ' The analytical data were submitted to GeoTracker as required under AB 2886 on May ay 6, 2003. The confirmation code for the submittal is 9882650673. 2.0 FINDINGS AND DISCUSSION Petroleum Hydrocarbons ' • MW-1 shows a historical increase in all analyzed constituents. TPH-G concentrations may also fluctuate with groundwater elevation (Chart] of Appendix A).