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I <br /> I <br /> Mr James Barton - <br /> • Pra�ectNo 880 039 iA01070000 <br /> April 29, 2003 <br /> Page 3 <br /> i <br /> Free product was not observed in groundwater rnorutarmg wells (see Table 1 and I <br /> I <br /> Appendix A) Shaw used the first quarter 2003 data to evaluate changes in concentrations <br /> of dissolved petroleum hydrocarbons in the groundwater Shaw sampling and analysis <br /> procedures are presented in Appendix B <br /> The groundwater samples were analyzed by Columbia Analytical (FLAP # 1105) in <br /> Redding, California, for TPHg using U S Environmental Protection Agency (USEPA) <br /> Method 8015M, and for BTEX and MTBE using USEPA Method 8020M Copies of the <br /> chain-of-custody records and laboratory analytical report are presented in Appendix C <br /> The results of laboratory analyses indicate that dissolved hydrocarbons were present in all <br /> four wells sampled TPHg were reported at concentrations ranging from 60 to <br /> 70,000 micrograms per liter (µg/L) Benzene was reported in all four wells sampled at <br /> concentrations ranging from 12 to 4,800 µg/1 MTBE was not detected by USEPA <br /> Method 8021B Results of laboratory analyses are summarized in Table 1 <br /> The groundwater gradient was approximately 0 004 with groundwater flow to the <br /> south-southwest(Figure 3) Groundwater analytical data are summarized on Figure 4 <br /> REMEDIATION SYSTEM STATUS FIRST QUARTER 2003 <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) Startup of the remediation <br /> system occurred on February 3, 2000, under the supervision of regulatory personnel <br /> Subsequently, Shaw staff perform weekly system O&M, collect influent and effluent air <br />�I samples monthly In accordance with air board permit requirements, and report quarterly <br /> to the air board <br /> Sampling Results <br /> On January 20, February 3, and March 10, 2003, vapor samples were collected <br /> . from treatment system's influent and effluent Samples were submitted to <br /> IISACRFPIICOMMON1sacDP120031Pr3188018800391A3acdoc SHAW ENVIRONMENTAL, INC <br />