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1 <br /> Ms Lori Duncan Project No 880-039 1 A 01010000 <br /> February 02, 2005 <br /> Page 2 <br /> Texaco Service Station (Figure 2) Residual and dissolved hydrocarbons have been <br /> detected beneath each of those facilities according to reports held by the SJCPHS <br /> iGROUNDWATER MONITORING FOURTH QUARTER 2004 <br />' On November 15, 2004, a Shaw technician measured depth to groundwater and collected <br /> samples from the nine Transmission Shop wells, MW-1R through MW-3-R, MW-4-R-S, <br /> and MW-4R-D, and VW-I D through VW-4 Shaw coordinated the day of sampling with <br /> those performed at adjacent service station sites Free product was not observed in the <br /> groundwater monitoring wells (see Table 1 and Appendix A) Sampling and analysis <br /> procedures are presented in Appendix B <br /> The groundwater samples were analyzed by Severn Trent Laboratory (NELAP #01119CA) <br />' in West Sacramento, California, for TPHg using U S Environmental Protection Agency <br /> (EPA) Method 8015M, and for benzene, toluene, ethylbenzene, and xylenes (BTEX) and <br /> methyl tert-butyl ether (MTBE) using EPA Method 8021B The results of laboratory <br /> analyses indicate that TPHg were present in the groundwater samples from wells MW-1R, <br /> MW-4R-S, and VW-1D through VW-4, at concentrations ranging from 170 to 41,000 <br /> micrograms per liter (µg/L) BTEX were reported in samples from wells MW-1R, <br /> MW-4R-S, MW-4R-D, and VW-11) through VW-4, benzene ranged from 19 to <br /> 7,300 µg/L MTBE was not detected in any sample during this event Copies of the <br /> chain-of-custody records and laboratory analytical report are included in Appendix C <br /> On November 15, 2004, site groundwater elevations varied from -15 to -14 feet mean <br /> sea level and indicated a trough that trended downward to the northeast Groundwater <br /> analytical data are summarized on Table 1 TPHg and benzene concentrations are shown <br /> on Figure 3 <br />' <br /> REMEDIATION I N SYSTEM STATUS FOURTH QUARTER 2004 <br /> The remediation system consists of four Shallow Zone and three Deep Zone soil vapor <br /> extraction (SVE) wells, from which soil vapors are extracted using a Stealth Bobcat <br />' Catalytic Oxidizer rated at 100 cubic feet per minute (cfm) Start up of the remediation <br /> system occurred on February 3, 2000, under the supervision of regulatory personnel <br /> Shaw staff have subsequently performed periodic O&M, collected influent and effluent <br /> air samples monthly in accordance with air board permit requirements, and reported <br /> ' N 1sacDP120051Prj188018800391A 5aa doc SHAW ENVIRONMENTAL,INC <br />