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1 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> ' FORMER DIAMOND LUMBER SITE <br /> JUNE, 1995 <br /> ' 2.2 Monitoring Well Purging <br /> Due to the various well diameters present on site, a double diaphragm pump was used to purge all <br /> ' of the sampled wells Monitoring well BEI-MW-2 was not sampled, due to excessive surface <br /> water runoff in the area of the well After all depths to groundwater were measured in the well, <br /> heavy rainfall resulted in surface runoff collecting in the vicinity of BEI-MW-2, which made <br /> purging and sampling impossible <br /> Each sampled well was purged until at Ieast three equivalent well volumes of water had been <br /> ' removed and pH, temperature and conductivity measurements had stabilized All purging and <br /> sampling equipment was washed in a tri-sodium phosphate solution and rinsed in distilled water <br /> prior to each usage to reduce the potential for cross contamination between wells The pH, <br /> ' temperature and conductivity measurements were recorded on a field data sheet, which are kept in <br /> a permanent project file The wells were allowed to stand for a period of time to equilibrate prior <br /> to sampling Groundwater purged from the wells was placed into DOT-approved SS-gallon <br /> ' drums The purge water will be disposed of by pumping into a vacuum truck and sending it to a <br /> 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 four <br /> degrees Celsius, and then transported to the Iaboratory under chain-of-custody (COC) The <br /> laboratory reports and COC documentation are included in Appendix C <br /> 2.4 Groundwater Analyses <br /> ' Analyses of the sampled groundwater were performed by Sierra Laboratories, Inc and Anlab <br /> Analytical Laboratories, California certified laboratories, in accordance with state guidelines and <br /> EPA protocols The samples were analyzed for TPH G and BTEX by EPA Methods 8015 <br /> Modified and 602, respectively Anlab completed the TPb analyses, with tn-laboratory filtering of <br /> the groundwater samples, using Method 200 7 <br /> 1 <br /> 7 <br />