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BlaeS Environmental Management Inc -Haul#709-50 002-70950-03 U Groundwater Momtonng Report 8/13/01 32 1 Groundwater Sample Collection--July 2001 Following purging, groundwater samples were collected from the on-site groundwater well ' g s 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 and an equipment blank sample was collected from the final rinse water used to decontaminate monitoring and sampling equipment Details of the groundwater sampling procedures are included in Appendix 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 analysis 3 2 2 Groundwater Sam le Analysis—July 2001 The groundwater samples collected in the July 2001 groundwater monitoring event were analyzed for ' total petroleum hydrocarbons as diesel (TPHd) and total petroleum hydrocarbons as gasoline (TPHg) using EPA Method 8015B, and benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl tert-butyl ' ether(MTBE), tert-Butyl Alcohol (TBA), Di-isopropyl Ether (DIPE), Ethyl tert-Butyl Ether(ETBE), and tert-Amyl Methyl Ether(TAME) according to EPA Method 8260B Groundwater samples collected from ' monitor wells MW-2, MW-2B, MW-4, MW-413, and MW-8A were analyzed for volatile hydrocarbons using EPA Method 8260 full list ' 3 3 GROUNDWATER ANALYTICAL RESULTS—JULY 2001 ' Laboratory analytical results of the July 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 July 2001 sampling event is presented in Table 2 A copy of the corresponding laboratory analytical report and chain-of-custody documentation is provided tin Appendix C 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 ' 9