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fes'_ Geomatrix <br /> 3.0 MONITORING RESULTS <br />' Second quarter 2005 WGR monitoring results are discussed in the following sections <br />' 3.1 GROUNDWATER ELEVATION, FLOW DIRECTION,AND GRADIENTS <br /> Groundwater elevation data from June 1, 2005 (Table 1), were used to construct potentiometnc <br />' contours on Figure 3 No separate-phase petroleum hydrocarbons were reported in the site wells <br /> Groundwater levels have dropped 0 1 to 0 2 feet in the site monitoring wells since first quarter <br /> 2005, with the exception that water levels did not change in wells MW3-5 and MW3-6 <br /> Groundwater elevation data for June 1, 2005, indicate a groundwater flow direction to the <br /> southeast and southwest at gradients of about 0 008 and 0 006 (Table 2 and Figure 3) <br />' Groundwater flow direction and gradient for second quarter 2005 are consistent with those <br /> 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 second 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, MW34, MW3-5, <br />' and MW3-6 were received by MAI on June 3, 2005 Holding times for the requested analyses <br /> were met Recoveries of surrogate spike samples were within laboratory quality control 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 second quarter 2005, groundwater samples from four of the six <br />' sampled groundwater monitoring wells had detectable concentrations of TPHg or BTEX <br /> Second quarter 2005 TPHg concentrations in groundwater samples collected from the site <br /> 1 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 downgradient well Although <br /> ilow concentrations of TPHg and BTEX compounds have been detected occasionally in <br /> ]\6000s\6437 GmAtchive\6437 030 doc 3 <br />