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• GEQNIATRIX <br /> measurements of DO and ORP were also taken (Appendix A) New clean disposable bailers <br /> were used to collect groundwater samples for field parameters and laboratory analysis of TPHg <br /> and BTEX <br /> Groundwater samples collected by Geornatrix were preserved and transported under chain-of- <br /> custody (Appendix B) procedures to Agricultural & Priority Pollutants Laboratories, Inc <br /> (APPL), in Fresno, California, a state-certified laboratory The groundwater samples from the <br /> site monitoring wells were analyzed by APPL for TPHg and BTEX using EPA Methods 8015 <br /> and 8260B,respectively <br /> 3.0 MONITORING AND SUPPLEMENTAL MONITORING RESULTS <br /> Second quarter 2004 WGR monitoring results and results of supplemental monitoring by <br /> Geomatrix are discussed in the following sections <br /> 3.1 GROUNDWATER ELEVATION, h+LOW DIRECTION,AND GRADIENTS <br /> Groundwater elevation data from May 21, 2004 (Table 1), were used to construct potentiometric <br /> contours on Figure 3 No floating product was reported in any of the site wells Groundwater <br /> levels have declined about 1 to 15 feet in the site monitoring wells since first quarter 2004 <br /> Based on the groundwater elevation data from May 21, 2004, the calculated groundwater flow <br /> direction for May 2004 is south-southwest at a gradient of about 0 006 to 0 008 (Table 2 and <br /> Figure 3) Groundwater flow direction and gradient for second quarter 2004 are consistent with <br /> groundwater flow direction and gradient 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 presents analytical results Copies of analytical reports for the <br /> groundwater samples collected for the second quarter 2004 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,MW34, MW3-5, and <br /> MW3-6 were received by PET on May 21, 2004 Holding times for the requested analyses were <br /> met Benzene was detected at a concentration of 0 75 microgram per liter (µg/L) in the trip <br /> blank (the reporting Iimit is 0 5 Rg/L) One monitoring well sample (MW3-4) had a benzene <br /> concentration of 0 53 [ug/L, which is less than five times the trip blank detection The MW3-4 <br /> I WR01£CT160009\6437 00M6437 21 doc 3 <br />