Laserfiche WebLink
1eo10gical7'eclutlrs litc Page 3 <br /> Groundwater Monitoring Report <br /> Project No 662 2 <br /> August 21, 2003 <br /> ' All water purged from each monitoring well and not used as a sample, was placed in a 55 <br /> gallon DOT approved container, properly labeled and stored on site until its proper <br /> ' disposition can be arranged <br /> Groundwater monitoring field logs are included in Appendix C <br /> ' <br /> 1.3 Laboratory Analyses <br /> ses <br /> ' The groundwater samples collected on May 15, 2003, were delivered to Sherwood Labs <br /> (Department of Health Services Certification No 1400) of Hilmar, California, for analysis <br /> The groundwater samples were analyzed for <br /> • Benzene, Toluene, Ethyl Benzene and Xylene (BTEX) by EPA method 8020 <br /> ' • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) <br /> Shei wood forwarded samples to Castle Analytical Laboratory (Department of Health <br /> ' Services Certification No 2480) of Atwater, California, for analysis of <br /> * Oxygenated Fuel Compounds (MTBE, DIPE, ETBE, TAME & TBA) by EPA method <br /> 8260 <br /> The detection limits for the above a analyses are e listed in Table 2 of Appendix A while the lab <br /> ' analytical results are presented in Appendix B <br /> As required under AB2886, the laboratory data was submitted electronically to GeoTracker <br /> on July 30, 2003 (confirmation # 5503883838 & 8544102311) <br /> ' 2.0 FINDINGS AND DISCUSSION <br /> The results of the groundwater sample analysis show the following <br /> ' • MW-I contained the gasoline oxygenate MTBE at 920 pg/1 The well also contained <br /> gasoline oxygenates ETBE and TAME at 2 1 and 7 1 ug/l, respectively These levels are <br /> consistent with past results <br /> ' • MW-2, which is upgradient of the former USTs, has not contained contaminant <br /> concentrations above the Laboratory detection limits for all fourteen quarterly events <br /> completed thus far in the investigation <br /> • MW-3 contained the gasoline oxygenate MTBE at 5600 µg11 The well also contained <br /> gasoline oxygenates ETBE and TAME at 10 and 30 ug/l, respectively <br /> • The detections of ETBE and TAME in wells MW-1 and MW-3 are intermittent and <br /> appear to be dependent on elevated MTBE concentrations and associated elevated <br /> reporting limits <br /> 1 <br />