ARCHIVED REPORTS_XR0004608 - Laserfiche WebLink

Home Browse Search

QUARTERLY MONITORING REPORT . FORMER DIAMOND LUMBER SITE ' DECEMBER, 1995 2.2 Monitoring Well Purging ' Due to the various well diameters present on site a double diaphragm pump was used to purge all of the sampled wells Each sampled well was purged until at least three equivalent well volumes ' of water had been removed and pH, temperature and conductivity measurements had stabilized All purging and sampling equipment was washed in a tri-sodium phosphate solution and rinsed in distilled water prior to each usage to reduce the potential for cross contarrunation between wells The pH, temperature and conductivity measurements were recorded on a field data sheet, which are kept in a permanent project file The wells were allowed to stand for a period of time to ' equilibrate prior to sampling Groundwater purged from the wells was placed into DOT- approved 55-gallon drums The purge water will be disposed of by pumping into a vacuum truck and sending it to a recycling facility ' 2.3 Groundwater Sampling ' Proper sample collection and handling are essential to assure quality data obtained from a sample Therefore, each groundwater sample was collected using a new disposable bailer for each well and placed in the appropriate laboratory prepared containers, using proper protocol The samples were labeled with the date, time and identifying well number, then placed into a cooler at 4° Celsius, and then transported to the laboratory under chain-of-custody (COC) The laboratory reports and COC documentation are included in Appendix B t2.4 Groundwater Analyses Analyses of the sampled groundwater were performed by Sierra Laboratories, Inc and AnIab Analytical Laboratories, California certified laboratories, in accordance with state guidelines and ' EPA protocols The samples were analyzed for TPH G and BTEX by EPA Methods 8015 Modified and 602, respectively Anlab completed the TPb analyses on the field filtered samples using Method 200 7 r 3.0 SUMMARY AND CONCLUSIONS ' 3.1 Results of Groundwater Laboratory Analyses ' TPH G was detected in four of the six wells sampled (BEI-MW I, BEI-MW-2, SEI-MW3, and SRK-MW-2), and reported at concentrations of 420, 2,100, 39,000, and 65 micrograms per liter (kig/I or ppb)respectively Benzene concentrations were 60, 310, 7,000 and 230 gg/l, ' respectively Total lead was only detected in BEI-MW-3 at a concentration of 4 4 ,Mg/l, with a detection limit of 2 gg/l The laboratory results are summarized for all sampling events performed by Park and others in Table 2 ' 2