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I �' WINZLER�KELLY C p N 5 U L T I N G E N G I N E E R 5 Mr James Ueda ' May 26, 2004 Page 3 ' Soil and Water The soil and groundwater generated during well installation, development, Storage/Disposal. and sampling was stored along the northern wall of the site in 55-gallon DOT-approved drums Wmzler&Kelly will coordinate the appropriate ' disposal of the soil and groundwater and will provide the SJCEHD with copies of the appropriate manifests upon completion ' Well Surveying- Monitoring well MW-4 was not surveyed prior to this report ANALYTICAL RESULTS OF SOIL SAMPLES ' The laboratory analysis of the three soil samples collected on April 1,2004 by EPA Method 8015M did not identify the presence of TPH-G or other organic material at concentrations above the laboratory's reportable detection limits (RDLs) Similarly, there were no volatile organic compounds ' identified above the laboratory's RDLs in the 8260B analysis A summary of the analytical results of the soil samples is provided in Table 1 The laboratory report, QA/QC data, and chain-of-custody form for the soil samples are included in Appendix C GROUNDWATER MONITORING AND SAMPLING RESUL'T'S The groundwater elevation data measured in the monitoring wells at the site is presented in Table 2 A groundwater contour map,provided as Figure 3, illustrates the groundwater elevation contours and ' flow direction at the site on Apnl 7, 2004 As Figure 3 shows, the groundwater flow direction at the site was toward the northeast, at an approximate gradient of 0 02 ft/ft ' During purging activities, the parameters of pH, conductivity, temperature, and oxidation-reduction potential were monitored in the groundwater extracted from the wells A summary of these indicator parameters is provided in Table 3 ' The laboratory analysis of the groundwater samples collected from MW-4 by EPA Methods 8015M and 8260B did not identify the presence of any petroleum related constituents above the laboratory's RDLs A comprehensive summary of the analytical results of the groundwater samples collected ' from monitoring wells at the site is provided in Table 4 Total xylenes and MTBE were the only petroleum-related constituents detected in the groundwater samples collected from monitoring wells MW-1 through MW-3, and the concentrations at which they were present were below the applicable ' regulatory limits Notably, no petroleum related constituents were detected in the groundwater samples collected from monitoring well MW-1, which during previous sampling events had the highest concentrations present Figure 4 depicts the concentrations of TPH-G,benzene, and MTBE in the groundwater samples collected on April 7,2004 The laboratory analysis of the trip blank by EPA Method 8015M18020 did not detect TPH-G or BTEX constituents above the laboratory's RDLs The laboratory QA/QC included the use of method {� blanks to exclude false-positive analyses and the use of laboratory control samples to evaluate the �1