Laserfiche WebLink
1 <br /> GEOMATRIX <br /> since fourth quarter 2004, with all wells having the highest water levels recorded during the <br /> period of record <br />' Groundwater elevation data for February 24, 2005, indicate a groundwater flow direction <br /> primarily to the south at a gradient of about 0 01 (Table 2 and Figure 3) Groundwater flow <br /> direction and gradient for first quarter 2005 are consistent with those during previous quarters <br /> 3.2 LABORATORY RESULTS <br />' The following sections provide an evaluation of the quality assurance/quality control results for <br /> the laboratory analyses and present analytical results Copies of analytical reports for the <br />' groundwater samples collected for the first quarter 2005 groundwater monitoring event are <br /> included in Appendix B <br /> 3.2.1 Quality Assurance/Quality Control Evaluation <br /> Groundwater samples collected by WGR for wells MW3-1, MW3-2, MW3-3, MW3-4, MW3-5, <br />' and MW3-6 were received by MAI on March 10, 2005 Holding times for the requested <br /> analyses were met Recoveries of surrogate spike samples were within laboratory quality control <br /> limits <br /> 3.2.2 Analytical Results <br /> Analytical results for quarterly groundwater monitoring parameters are presented in Table 3 <br /> Historical analytical results for grab groundwater samples collected from soil bonngs are <br />' included in Table 4 During first quarter 2005, groundwater samples from four of the six <br /> sampled groundwater monitoring wells had detectable concentrations of TPHg or BTEX <br /> Historical and first quarter 2005 TPHg concentrations in groundwater samples collected from the <br /> site soil borings and monitoring wells are plotted and contoured on Figure 4 <br /> Groundwater wells MW3-4 and MW3-5 are background wells, wells MW3-1, MW3-2, and <br />' MW3-3 are completed near the former UST, and well MW3-6 is a downgradzent well Low <br /> concentrations of TPHg and BTEX compounds have been detected occasionally in groundwater <br /> samples from background wells MW3-4 and MW3-5 (Table 3) However, during the first <br />' quarter 2005 monitoring event, TPHg and BTEX were not detected in groundwater samples from <br /> wells MW3-4 and MW3-5 During the first quarter 2005 monitoring event, TPHg and BTEX <br /> were detected in groundwater samples from monitoring wells MW3-1, MW3-2, MW3-3, and <br /> • MW3-6 (Table 3) Methyl tertiary butyl ether was removed as a constituent of concern at UST <br /> Site No 3 because it has not been detected in groundwater samples collected at the site <br /> 116000116437 0001Arehive16437 027 doc 3 <br />