ARCHIVED REPORTS XR0001507 - Laserfiche WebLink

Home Browse Search

si •I i C A M B R I A Blaine developed the wells using surge block agitation and pump evacuation Blaine's groundwater monitoring and well development report, which includes field sheets, is presented as Appendix C Wellhead Survey Virgil Chavez Land Surveying (licensed land surveyor No 6323) of Vallejo, California surveyed the top of casing elevations for wells MW-1 through MW-5 relative to mean sea level and surveyed the well's latitude and longitude on December 23, 2002 (Appendix E) Groundwater Flow Dtrectton: Cambria evaluated water-level measurement data from January 22, 2003 and prepared a groundwater contour map (Figure 3) Groundwater flow direction is east to southeast this quarter with an approximate hydraulic gradient of 0 001 HYDROCARBON DISTRIBUTION IN SOIL No TPHg, benzene, fuel oxygenates, or lead scavengers were detected in soil samples collected from well bonngs MW-1 through MW-5 The soil chermcal analytical data are summarized in Table 2 and TPHg, benzene, and MTBE concentrations are presented on Figures 2, 4, and 5 Laboratory analytical reports are presented in Appendix F HYDROCARBON DISTRIBUTION IN GROUNDWATER TPHg and BTEX were detected in a groundwater sample collected from well MW-1 at concentrations of 1,100 parts per billion (ppb) and 2 4 ppb, respectively MTBE was detected in a groundwater sample collected from well MW-2 at a concentration of 5 0 ppb 1,2-DCA was detected in wells MW-1, MW-2, and MW-4 at concentrations ranging from 34 to 310 ppb No other fuel oxygenates or EDB were detected in the groundwater samples collected from the wells The groundwater chenucal analytical data are summarized in the well concentrations table in Blaine's report (Appendix C) and to Table 3 Benzene and MTBE results are presented on • Figure 3 Laboratory analytical data are included in Blaine's report(Appendix C) 1511 4