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' RUZrEnvtronmental Management Inc U Haul#709-50 002-70950-02 Semi-Annual Report 12/14/00 2 2 Groundwater Sampling,September 2000 On September 26 and 27, 2000, Blaes Environmental collected 16 groundwater samples from the on-site monitoring well casing Purging techniques employed during this sampling event were the same as those ' during the June 2000 sampling event The purged water was transferred from five-gallon buckets to an on-site 1,000-gallon polyethylene storage tank Approximately three well volumes of groundwater were ' purged from the wells and periodic parameter readings were recorded on the field data sheets included in Appendix D ' .2 2.l- ErQundwaterSam.aLeCqyection —SAptember2M ' Following purging, groundwater samples were collected cted from the on-site groundwater wells using new polyethylene disposable bailers 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 sheets included in Appendix D Groundwater samples collected at the site were contained in appropriate sample containers supplied by CAS Following collection, the groundwater samples were placed in an iced cooler and transported, under proper chain-of-custody record, to CAS for analysis .2.2.2 Groundwater Sa=Ie Ani sr. — egtember 2000 The groundwater samples were analyzed for TPHg, TPHd, and TPH as oil (TPHo) using the hydrocarbon scan, EPA Method 8015M, and BTEX, MTBE, TBA, DIPE, ETBE, and TAME according to EPA Method 8260 The chain-of-custody document indicates the analysis for each sample collected at the site 32.3 rou ater Amalytical Results—September 2000 Laboratory analytical results of the September 2000 groundwater sampling event indicate that groundwater beneath the site contains hydrocarbons at variable concentrations A summary of analytical results for the September 2000 sampling event is presented in Table 3 A copy of the corresponding laboratory analytical report and chain-of-custody documentation is provided in Appendix E Review of the analytical results by sample group (i a the middle casing and Iower casing) groundwater samples, indicates that the extent of hydrocarbons at the groundwater surface is defined by wells on the 12