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61aOS Environmental Management Inc U Haul#709 50 <br /> 002 70950-03 <br /> Groundwater Monitoring Repot <br /> 1/25/02 <br /> Blaes Environmental is treating the water by aeration Disposal of the contained water will be discussed <br /> in a separate report <br /> 3 2 1 Groundwater Sample Collection—December 2001 <br /> Following purging, groundwater samples were collected from the on- and off-site groundwater wells <br /> using a new polyethylene disposable bailer Prior to sample collection, the depth to groundwater was <br /> measured to confirm that the groundwater level had recovered to within 90% of its original level The <br /> water level measurements, sample name, time, and sample containers were recorded on a sample data <br /> sheet included in Appendix A Details of the groundwater sampling procedures are included in <br /> Appendix B <br /> Groundwater samples collected from the site were contained in appropriate sample bottles supplied by <br /> Del Mar Following collection, the groundwater samples were placed in an iced cooler and transported, <br /> under proper chain-of-custody record, to Del Mar for analysis <br /> 3 22 Groundwater Sample Analysis—December 2001 <br /> The groundwater samples collected in the December 2001 groundwater monitoring event were analyzed <br /> for total petroleum hydrocarbons as diesel (TPHd) and TPHg using EPA Method 801513, and benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX), methyl tert-butyl ether (MTBE), tert-Butyl Alcohol (TBA), <br /> Di-isopropyl Ether (DIPE), Ethyl tent-Butyl Ether (ETBE), and tert-Amyl Methyl Ether (TAME) <br /> according to EPA Method 8260B The groundwater samples collected from wells MW-213 and MW-2C <br /> were analyzed for volatile organic compounds using EPA Method 8260B full list <br /> 3 3 GROUNDWATER ANALYTICAL RESULTS—DECEMBER 2001 <br /> Laboratory analytical results of the December 2001 groundwater sampling event, which included two <br /> sample groups (the middle `B" casing and lower "C" casing samples), revealed substantial variation <br /> between sample groups A summary of analytical results for the December 2001 sampling event is <br /> presented in Table 2 A copy of the corresponding laboratory analytical report and chain-of-custody <br /> documentation is provided in Appendix C <br /> 7 <br />