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Blaes Eninonmewal hlanagenzent lix U Haul#709 50 002-70950-04 Groundwater Monitoring Report 03/27/02 . water level measurements, sample name, time, and sample containers were recorded on a sample data sheet included in Appendix A Details of the groundwater sampling piocedures are included in Appendi\ B Groundwater samples collected from the site were contained in appropriate sample bottles supplied by Del Mar Following collection, the groundwater samples were placed in an iced cooler and transported, under proper chain-of-custody record, to Del Mar for analysts 3 2 2 Groundwater Sample Analysis— March 2002 The groundwater samples collected in the March 2002 groundwater monitoring event were analyzed for total petroleum hydrocarbons as diesel (TPHd) and TPHg using EPA Method 8015B, and benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl tert-butyl ether (MTBE), tent-Butyl Alcohol (TBA), Di-isopropyl Ether (DIPE), Ethyl tert-Butyl Ether (ETBE), and tert-Amyl Methyl Ether (TAME) according to EPA Method 8260E The groundwater samples collected from wells MW-1C, MW-213 and MW-2C were analyzed for volatile organic compounds using EPA Method 8260B full list . 33 GROUNDWATER ANALYTICAL RESULTS — MARCH 2002 Laboratory analytical results of the March 2002 groundwater sampling event, which included two sample groups (the middle `B" casing and lower "C" casing samples), revealed substantial variation between sample groups A summary of analytical results for the March 2002 sampling event is presented in Table 2 A copy of the corresponding laboratory analytical report and chain-of-custody documentation is provided in Appendix D Analytical results of groundwater samples collected from the well casings screened across the groundwater interface (middle "B" casings) revealed the highest concentrations of hydrocarbons in groundwater from wells MW-313, MW-213, MW-4B, and MW-613 The concentrations of hydrocarbons in groundwater from well MW-213 (61,000 gg/L TPHg and 16,000 gg/L benzene) and well MW-313 (120,000 pg/L TPHg and 22,000 µg/L benzene) suggest that the source area of hydrocarbons was near these two wells The elevated concentrations of hydrocarbons in water from wells MW-413 and MW-613 suggest that the hydrocarbon plume has spread across the site between the eastern and western property boundaries The non-detect levels of benzene in groundwater from monitor wells MW-SB and MW-8A 7