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FIRST QUARTER 1996 <br /> • GROUNDWATER MONITORING REPORT <br /> FORMER DIAMOND LUMBER - MANTECA <br /> APRIL, 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 tn-sodium phosphate solution <br /> and rinsed in distilled water prior to each usage to reduce the potential for cross contamination <br /> 1 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 thick 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, then placed into a cooler at 4° C, <br /> and then transported to the laboratories under continuous chain-of-custody (COC) <br /> documentation The 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 laboratory Samples were analyzed in accordance with state guidelines and <br /> EPA protocols <br /> 3.0 SUMMARY AND CONCLUSIONS <br /> I3.1 Results of Groundwater Laboratory Analyses <br />' TPH G and BTEX were detected in three of the six wells sampled (BEI-MW1, BEI-MW2 and <br /> BEI-MW3) TPH G was reported at concentrations of 10,000, 5,200 and 33,000 micrograms per <br /> hter()ug/l), respectively Benzene concentrations were 380, 160 and 5,000 ,ugA, respectively <br /> rThe laboratory results are summarized for all sampling events performed by Park and others in <br /> Table 2 <br /> 2 <br />