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Geological Teckicicslfu Page 4 161 Quarter 2005 Groundwater Monttonng Report Project No 507 2 April 18,2005 1 ' All non-disposable sampling equipment was decontaminated using a hot water washer and detergent before and between uses Disposable gloves were used by the technician to collect all samples and were changed with each sample collection ' A chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing a means to track the movement of and insure the ' integrity of the samples All water purged from each monitoring well and not used as a sample was placed in a 55 ' gallon DOT approved container These drums were properly labeled and will be stored on site until their proper disposition can be arranged ' Groundwater monitoring field logs are included in Appendix C 1.3 Laboratory Analyses The groundwater samples collected on February 17 2005 were delivered to Sherwood Labs g p �' , Corporation, Department of Health Services Certification No 1400, of Hilmar, California, for analysis Sherwood Labs analyzed the groundwater samples for • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by EPA method 8020 i Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015 • MTBE by EPA Method 8020 The results and detection limits for the above analyses are listed in Table 3 of Appendix A while the lab analytical results are presented in Appendix B As required under AB2886, the laboratory and groundwater elevation data were submitted ' electronically to GeoTracker on March 25, 2005 - confirmation numbers 3573097288 & 3991505265 ' 2.0 FINDINGS AND DISCUSSION ' The results of the groundwater sample analyses indicate the following • Wells MW-1, MW-2 and MW-3 remain free of detectable contamination ' • MW-4, MW-5 and MW-9 have significant BTEX and TPH-G contamination 0 MW-6 could not be sampled as it was under water • MW-8 has minor TPH-G and/or BTEX contamination 1