ARCHIVED REPORTS XR0001190 - Laserfiche WebLink

Home Browse Search

r rMr John Benedtct Project No 880-039 1A iOctober 18, 2002 Page 3 ' attempted to coordinate joint quarterly sampling with the former ARCO Facility 2168, located east and downgradient of the subject site, but has not gotten a response from their consultant Free product was not observed in groundwater monitoring wells (see Table 1 and Appendix A) Shaw E &I used the third quarter 2002 data to evaluate changes in concentrations of dissolved petroleum hydrocarbons in the groundwater Shaw E &I sampling and analysis procedures are presented in Appendix B The groundwater samples were analyzed at Sparger Technology in Sacramento, California, for TPH-g using U S Environmental Protection Agency (USEPA) LMethod 8015M, and for BTEX and MTBE using USEPA Method 8020M Copies of the chain-of-custody records and laboratory analytical report are presented in Appendix C The results of laboratory analyses indicated that dissolved hydrocarbons were present in all three wells sampled TPH-g were reported at concentrations ranging from 300 (well MW-1R) to 92,000 (well VW-2) micrograms per liter (pg/L) Benzene was reported in wells VW-2 and VW-3 at concentrations of 5,900 and 1,500 µg/L, respectively MTBE was not detected in groundwater samples collected during the third quarter 2002 sampling event Results of laboratory analyses are summarized in Table 1 'r The gradient was approximately 0 02 with groundwater flow to the northwest (Figure 3), which is similar to previous events Groundwater analytical data are summarized on rFigure 4 REMEDIATION SYSTEM STATUS; THIRD QUARTER 2002 The remediation system consists of four shallow zone and three deep zone soil vapor extraction (SVE) wells, from which soil vapors are extracted using a Stealth Bobcat Catalytic Oxidizer rated at 100 cubic feet per minute (cfm) Startup of the remediation ' system occurred on February 3, 2000, under the supervision of regulatory personnel Subsequently, Shaw E & I staff perform weekly system O&M, collect influent and effluent air samples monthly in accordance with air board permit requirements, and report quarterly to the air board N\SacDP120021PRAPJ8188018800391A 2ag doe Shaw Environmental and Infrastructure, Inc. (01050000)