Laserfiche WebLink
lie to provide a control on the shipping procedures All samples were submitted to the <br /> District laboratory along with the appropriate Cham-of-Custody forms <br /> ' 4.3 Analytical Results <br /> Analytical results from the First Quarter 1994 sampling are summarized in <br /> Table 4 The laboratory analytical data sheets and quality control results are <br /> ' provided in the Appendix The quality control results provided positive correlation <br /> with matrix samples and confirmed that the samples had been collected, shipped, and <br /> analyzed properly <br /> ' The First Quarter 1994 results are consistent with Third Quarter and Fourth <br /> Quarter 1993 sampling results, which are summarized on Table 2 However, it <br /> ' appears that the contaminant concentrations at MW-8 are decreasing, and the <br /> contaminant concentrations in MW-1 are beginning to increase This potential trend <br /> ' will be monitored over the next quarters of sampling, and during implementation of <br /> the remediation system <br /> A groundwater sample collected from MW-9 during Fourth Quarter 1993 <br /> ' indicated a low concentration of benzene in MW-9 To verify the presence of <br /> benzene at MW-9, the groundwater samples collected at MW-9 were split One <br /> sample was analyzed by the District's laboratory, and the split sample was analyzed <br /> by Anlab The District's laboratory reported traces of benzene (1 7 Ag/L) and TPH-g <br /> ' (62 µg/L), whereas Anlab reported benzene and TPH-g below detection limits <br /> Anlab's detection limits for benzene is 0 5 gg/L and 20 gg/L for TPH-g The District <br /> and Anlab results are within typical duplicate QC ranges TPH-g and benzene <br /> ' concentrations in MW-9 have ranged from below detection limits to extremely low <br /> detections Future sampling of MW-9 is necessary to monitor the extent of possible <br /> ' contamination It is anticipated that the presence of petroleum hydrocarbons in the <br /> groundwater at MW-9 will be remediated by the proposed bioremediation system <br /> ' The bacterial platlet results indicate the presence of naturally occuring bioactivity <br /> This data will be used to help determine the amount of enzyme required as part of <br /> the bioremediation system <br /> ' 94 R& last Bay Municipal Utility Dtstnu <br /> 40429600 istgtr gw 10 Stockton Service Center- i'irsi Quarter 1994 <br />