Laserfiche WebLink
CAMBRIA <br /> s <br /> details are presented on Table 1 and recorded on the exploratory <br /> boring logs (Appendix B) <br /> Well Development/Sampling. Blaine developed and purged wells MW-12 and MW-13 on <br /> February 23,2004 and sampled the wells on February 27, 2004 <br /> Blame developed the wells using surge block agitation and pump <br /> evacuation Blaine's groundwater monitoring and well <br /> development report is presented as Appendix C <br /> Wellhead Survey: Virgil Chavez (licensed land surveyor No 6323) of Vallejo, <br /> California surveyed the top of casing elevations for wells <br /> MW-12 and MW-13 relative to mean sea level and the longitude <br /> and latitude of both wells on March 5, 2004(Appendix E) <br /> Groundwater Flow Direction. Cambria evaluated water-level measurement data and prepared a <br /> groundwater contour map (Figure 3) Groundwater flow <br /> direction is primarily to the east-northeast at an approximate <br /> hydraulic gradient of 0 003 <br /> HYDROCARBON DISTRIBUTION IN SOIL <br /> No TPHg, BTEX, or fuel oxygenates were detected in soil samples collected from either of the <br /> borings The soil chemical analytical data are summanzed in Table 2 and the TPHg, benzene, <br /> and MTBE results are presented on Figure 2 The certified analytical reports are presented in <br /> Appendix F <br /> HYDROCARBON DISTRIBUTION IN GROUNDWATER <br /> EDB has not been detected in groundwater samples collected from site monitoring wells for three <br /> consecutive quarters No TPHg, BTEX, MTBE, or 1,2-DCA was detected in groundwater <br /> samples collected from wells MW-1 through MW-3 TP1J_g was detected m :yells MW-6 through <br /> MW-11 and VEW-2 at concentrations ranging from 320 to 78,000 ppb The laboratory noted <br /> that the TPHg reported does not match the laboratory's standard in samples MW-6 and MW-8 <br /> through MW-11 As noted previously, this is due to the presence of tetrachloroethene (PCE) in <br /> these wells Benzene was detected in wells MW-4, MW-5, MW-7, MW-8, and VEW-2 at <br /> concentrations ranging from 0 57 to 2,300 ppb MTBE was detected in wells MW-4, MW-8, <br /> MW-12, and MW-13 at concentrations ranging from 0 80 to 33 ppb DIPE and TBA were <br /> 0854 6 <br />