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1 <br />' GEOINI4TRIX <br /> . Field parameters (electric conductivity, pH, and temperature) were measured during well purging <br />' and recorded on field data sheets (Appendix A) New clean disposable bailers were used to <br /> collect the groundwater samples for laboratory analysis of volatile organic compounds <br />' Groundwater samples were preserved and transported under chain-of-custody (Appendix B) <br /> procedures to Precision Enviro-Tech Analytical Laboratory of Stockton, California, a <br />' state-certified laboratory, for analyses The groundwater samples from the six site monitoring <br /> wells were analyzed for TPHg using U S Environmental Protection Agency (EPA) Method 8015 <br /> and BTEX using U S EPA Method 8260B <br />' 3.0 MONITORING RESULTS <br /> Groundwater levels were measured and samples were collected from six site wells during second <br />' quarter 2003 Field water quality parameters are included on well purging and sampling forms <br /> (Appendix A) Groundwater elevation data, groundwater flow direction and gradient, and <br />' analytical data are presented in Tables 1, 2, and 3, respectively Laboratory analytical reports <br /> and chain-of-custody records are included in Appendix B <br /> 10 3.1 GROUNDWATER ELEVATION,FLOW DIRECTION,AND GRADIENTS <br /> Groundwater levels measured on May 28, 2003 (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 0 2 to 0 3 feet in the site monitoring wells since first quarter 2003 <br />' Based on the groundwater elevation data, the calculated groundwater flow direction for <br /> May 2003 is south to southwest at a gradient of 0 006 (Table 2 and Figure 3) Groundwater flow <br />' direction and gradient for second quarter 2003 is similar to flow direction and gradient during <br /> first quarter 2003 <br /> 3.2 LABORATORY RESULTS <br />' The following summarizes the quality assurance/quality control of the laboratory analyses and <br /> presents analytical results Copies of analytical reports for the groundwater samples collected for <br /> the second quarter 2003 groundwater monitoring event are included in Appendix B <br /> 3.2.1 Quality Assurance/Quality Control Evaluation <br />' Three groundwater samples for MW3-1, MW3-2, and MW3-3 were received by the laboratory <br /> on May 28, 2003, and three groundwater samples for MW34, MW3-5, and MW3-6 were <br />' received on May 30, 2003 Holding times for the requested analyses were met No analyzed <br /> t11PROJECI16000s16437 00016437-11 doc 3 <br />