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Blaes Environmental Management Inc U-Haul#709-50 002 70950-04 2nd Qtr 2003 Groundwater Monitoring Report 6/2710' Groundwater sample collection involved purging approximately three well volumes of groundwater from each well and allowing the wells to recharge before sample collection Purging was performed during I this event either by hand bailing or pumping water from the well casings, dependent on the volume of water in the well The bailer used for purging during this sampling event was a 1&7/8-inch diameter by 3-foot long bailer Blaes Environmental utilized a 2" Grundfos "Reds-flo" submersible pump for purging by pumping The bailers and pump were decontaminated before and after purging each well with a liquid detergent wash (Alconox®) and a tap-water rinse Periodic parameter readings were recorded on the field data sheets included in Appendix A The groundwater purging procedures are presented in Appendix B Purge water was stored in a 1,000-gallon polyethylene tank located on the property pending proper recycling and disposal 3 2 1 Groundwater Sample Collection- May 2003 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, the depth to groundwater was measured to confirm that the groundwater level had recovered to within 90% of its original level Duplicate groundwater samples were collected by Blaes Environmental from wHarry's Auto's monitoring wells (HA MW-1 through HA MW-4) simultaneously with GZA's normally scheduled sample collection 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 for analysis 3 2 2 Groundwater Sample Analysis—May 2003 The groundwater samples collected during the May 2003 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 8