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C A M B R I A <br /> Well Development/Sampling Blame developed and purged wells MW-8 through MW-11 on <br /> August 1, 2003 and sampled all site wells on August 21, 2003 <br /> Blaine developed the wells using surge block agitation and pump <br /> evacuation Blaine's groundwater monitoring and well <br /> development report, which includes field sheets, is presented as <br /> Appendix C <br /> Wellhead Survey: Virgil Chavez Land Surveying (licensed land surveyor <br /> No 6323) of Vallejo, California surveyed the top of casing <br /> elevations for wells MW-8 through MW-11 relative to mean sea <br /> level and surveyed the well's latitude and longitude on <br /> August 15, 2003 (Appendix E) <br /> Groundwater Flow Direction Cambria evaluated water-level measurement data from <br /> August 21, 2003 and prepared a groundwater contour map <br /> including a rose diagram (Figure 3) Groundwater flow <br /> direction is predominantly to the east this quarter with a <br /> hydraulic gradient ranging from 0 004 to 0 017 <br /> HYDROCARBON DISTRIBUTION IN SOIL <br /> No TPHg, BTEX, or fuel oxygenates were detected in soil samples collected from well borings <br /> MW-8 through MW-10 However, the soil samples were analyzed outside of hold time No soil <br /> samples were analyzed from well MW-11, because it is located near well MW-1, where soil <br /> samples have already been collected and analyzed <br /> The soil chemical analytical data are summarized in Table 2 and TPHg, benzene, and MTBE <br /> results are presented on Figure 2 Laboratory analytical reports are included in Appendix F <br /> HYDROCARBON DISTRIBUTION IN GROUNDWATER <br /> TPHg and BTEX were not detected in any of the site wells by Blaine on August 21, 2003 <br /> MTBE was detected in groundwater samples collected from wells MW-1 through MW-5, MW-7, <br /> MW-9, P-1, and P-2 at concentrations ranging from 0 52 to 120,000 ppb MW-11, which is <br /> screened from 90 to 100 fbg, also contained 3 0 ppb MTBE TBA was detected in wells MW-1 <br /> through MW-4, P-1, and P-2 at concentrations ranging from 310 to 100,000 ppb, and in MW-1 i <br /> 0955 7 <br />