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Blass Environmental Management Inc U-Haul#709-50 002-70950-03 Groundwater Monitoring Report 10/22/01 • 32 1 Groundwater_Sample Collection—September 2001 Following purging, groundwater samples were collected from the on-site groundwater wells using a new polyethylene disposable bailer Prior to sample collection, the depth to groundwater was measured to confirm that the groundwater level had recovered to within 90% of its original level The water level measurements, sample name, time, and sample containers were recorded on a sample data sheet included in Appendix A In addition to the groundwater samples collected from the on-site monitor wells, a duplicate sample (MW-6D)was collected from monitor well MW-6 Details of the groundwater sampling procedures are included in Appendix B Sample MW-61) was collected from well MW-6 in a slightly different manner than sample MW-6 The difference involved lowering the sample bailer to the bottom of the well before retrieving the sample The lower third of the retrieved bailer contained cloudy water 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 analysis • 3 2 2 Groundwater Sample Analysis— September 2001 The groundwater samples collected in the September 2001 groundwater monitoring event were analyzed for total petroleum hydrocarbons as diesel (TPHd) and TPHg using EPA Method 801513, and benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl tert-butyl ether (MTBE), tert-Butyl Alcohol (TBA), Dl-isopropyl Ether (DIPE), Ethyl tert-Butyl Ether (ETBE), and tert-Amyl Methyl Ether (TAME) according to EPA Method 8260B 3 3 GROUNDWATER ANALYTICAL RESULTS — SEPTEMBER 2001 Laboratory analytical results of the September 2001 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 September 2001 sampling event is presented in Table 2 A copy of the corresponding laboratory analytical report and chain-of custody documentation is provided in Appendix C 8