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Bees Environmental Management Inc 2nd Qtr 2004 Groundwater Momtonng Report 002-70950-04 U-14aut#709-50 32 1 Groundwater Sample Collection—May 2004 Following purging, groundwater samples were collected from both U-Haul's on-site and off-site groundwater wells using a new polyethylene disposable bailer for each well Prior to sample collection, t the depth to groundwater was measured to confirm that the groundwater level had recovered to within f90% of its original level The water level measurements, sample name, time, and container type were recorded on sample data sheets included in Appendix A Groundwater sampling procedures are described in Appendix B Groundwater samples collected from the site were contained in appropriate sample bottles supplied by Sequoia Analytical Following collection, the groundwater samples were placed on ice and transported, under proper chain-of-custody protocol, to Sequoia Analytical of ISacramento, California for analysis 3 2 2 Groundwater Sample Analysis—May 2004 The groundwater samples collected during the second quarter 2004 groundwater monitoring event were analyzed for Total Petroleum Hydrocarbons as diesel (TPHd) and Total Petroleum Hydrocarbons as gasoline (TPHg), using U S Environmental Protection Agency (EPA) Method 8015B The samples were also analyzed for Volatile Organic Compounds (VOC's) including benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tert-butyl ether (MTBE), tert-butanol (TBA), di-isopropyl ether (DIPS), ethyl tert-butyl ether (ETBE), and tert-amyl methyl ether (TAME), 1,1-Dichloroethane (1,1 DCA), 1,2- Dichloroethane (1,2 DCA), and 1,2 Dibromoethane (EDB) according to EPA Method 8260 3 3 GROUNDWATER ANALYTICAL RESULTS—MAY 2004 Laboratory analytical results for the May 2004 groundwater sampling event, which included two sample 11 groups (middle and lower casing samples), revealed substantial variation between the two groups A ` summary of the analytical results for the May 2004 sampling event is presented in Table 3 A copy of the {F corresponding laboratory analytical report and chain-of-custody documentation is provided in Appendix C Analytical results of groundwater samples collected from the well casings screened across the groundwater interface (middle "B" casings) typically reveal two co-mingled plumes of dissolved phase hydrocarbons beneath the U-Haul site and the Former Harry's Auto Mart Facility However, as GZA did 8