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i <br /> C A M B R I A <br /> Groundwater Flow Direction: Based on groundwater elevations measured during past quarterly <br /> groundwatermonitoring events at the site,groundwater generally <br /> flows northwesterly at an approximate hydraulic gradient of . <br /> ,n.:... .=,,0.005 to 0.007. Cambria will prepare a groundwater contour. <br /> map using groundwater elevation data from the new wells along <br /> with the existing site wells for the second quarter 2005 <br /> groundwater monitoring report. <br /> HYDROCARBON DISTRIBUTION IN SOIL <br /> No TPHg, BTEX, or MTBE were detected in soil samples collected from boring MW-5. No <br /> TPHg or BTEX were detected in soil samples collected from borings MW-6,MW-7, and SB-1. <br /> MTBE was detected in boring MW-6 at 15, 20, and 25 fbg.at concentrations of 0.27, 0.84, and <br /> 1.3 ppm, respectively. MTBE was detected in boring MW-7 at 20 fbg at a concentration of 0.017 <br /> ppm. MTBE was detected in boring S13-1 at depths of 20, 30. 60, 80, and 86 fbg at <br /> concentrations ranging from 0.0066 to 0.39 ppm. <br /> The soil chemical analytical data are summarized in Table 2 and the TPHg, benzene, and MTBE <br /> results are presented on Figure 2. Laboratory analytical results are presented in Appendix.G. <br /> HYDROCARBON DISTRIBUTION IN GROUNDWATER <br /> Three deep grab groundwater samples were collected from boring SB=1 at depths of,52, 72, and <br /> 82 fbg. No TPHg, BTEX, MTBE, or TBA were detected in the grab groundwater samples <br /> collected from boring SB-1. The groundwater chemical analytical data for grab groundwater <br /> samples are summarized in Table 3,and the TPHg, benzene, and MTBE results are presented on <br /> Figure 2. The certified laboratory analytical report is included in Appendix G. <br /> SENSITIVE RECEPTOR SURVEY UPDATE <br /> Cambria was able to verify the existence and location of four of the six wells documented in the <br /> September 30, 2004 SECOR site investigation report. Two of the wells reported by SECOR <br /> could not be located. Additionally, Cambria located two domestic wells on West Grant Line <br /> Road and South Corral Hollow Road. We also located one well on the northeast corner of West <br /> Grant Line Road and Naglee Road. <br /> 1661 6 1 <br /> 1 <br />