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THIRD QUARTER 1996 <br /> . GROUNDWATER MONITORING REPORT <br />' FORMER DIAMOND LUMBER - MANTECA <br /> OCTOBER, 1996 <br /> 2.2 Monitoring Well Purging <br /> Each sampled well was purged using a submersible pump until at least three equivalent well <br />' volumes of water had been removed and pH, temperature and conductivity measurements had <br /> stabilized All purging and sampling equipment was washed in a trisodium phosphate solution and <br /> rinsed in distilled water prior to each usage to reduce'the potential for cross contamination <br /> between wells The pH, temperature and conductivity measurements were recorded on a field <br /> data sheet, which are kept in a permanent project file The wells were allowed to stand for a <br /> period of time to equilibrate prior to sampling Groundwater purged from the wells was placed <br />' into DOT approved 55-gallon drums The purge water will be disposed of by pumping into a <br /> vacuum truck and sending it to a recycling facility <br />' 2.3 Groundwater Sampling <br /> Proper sample collection and handling are essential to assure quality data obtained from a sample <br />' Each groundwater sample, therefore, was collected using a new disposable bailer for each well <br /> and placed in the appropriate laboratory prepared containers, using proper protocol The samples <br /> were labeled with the date, time and identifying well number, placed into a cooler at 4° C, and <br /> transported to the laboratory under continuous chain-of-custody (COC) documentation The <br /> laboratory reports and COC documentation are included in Appendix B <br />' 2.4 Groundwater Analyses <br />' Analyses of the sampled groundwater were performed by Sierra Laboratories, Inc (Sierra), a <br /> California certified Iaboratory Samples were analyzed in accordance with state guidelines and <br /> EPA protocols <br /> 1 <br /> 3.0 SUMMARY AND CONCLUSIONS <br /> 3.1 Results of Groundwater Laboratory Analyses <br /> ' TPH G and BTEX were detected in five of the eight wells sampled (BEI-MW1, BEI-MW2, BEL <br /> MW3, SRK-MW2, and MW-7-P) TPH G was reported at concentrations from non-detect in <br /> SRK-MW1, SRK-MW3 and MW-$-P to 55,000 micrograms per liter (agA) in BEI-MW3 _ <br /> ' Benzene was reported at wnLenuations from non-detect in SRK-MW1, SRK-MW3 and MW-8-P <br /> to 7,500 /-ig/l in BEI-MW3 MTBE was not detected in any of the wells tested The laboratory <br /> results for this sampling event are presented on Figure 3 and in Table 2 <br /> 2 <br />