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Blass Environmental Management Inc 3rd Qtr 2004 Groundwater Monitoring Report 002-70950-04 U-Haul#709-50 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 Sacramento, California for analysis ' 3 2 2 Groundwater Sample Analysis---August 2004 The groundwater samples collected during the third 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 (DIPE), ' ethyl tert-butyl ether (ETRE), 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 1 3 3 GROUNDWATER ANALYTICAL RESULTS—AUGUST 2004 ' Laboratory analytical results for the third quarter 2004 groundwater sampling event, which included two sample groups (middle and lower casing samples), revealed substantial variation between the two groups The petroleum hydrocarbon concentrations in the groundwater samples collected from the "B" casing wells were substantially higher for the third quarter 2004 groundwater sampling event than in the second quarter Blaes Environmental has observed similar conditions during the third quarters of previous years The rise in VOC levels is attributed to the season fluctuation of groundwater elevation as the groundwater interface moves across the smear zone A summary of the analytical results for the August 2004 sampling event is presented in Table 3 A copy of the corresponding laboratory analytical report and chain-of-custody documentation is provided in Appendix C µ 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, analyses of Igroundwater samples collected during the third quarter of 2004 are inconsistent between the U-Haul and Harry's Auto properties Blaes Environmental and GZA both use monitoring well MW-7C as part of 8