ARCHIVED REPORTS XR0003044 - Laserfiche WebLink

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301 West Kettleman Lane, Lodi - 2 - 22 September 2000 contamination. The interim pump and trept'system must stabilize the groundwater plume to prevent movement of MtBE toward Well 12.°' On 3 July, I met with Chevron Representative Bob Cochran, and Chevron consultant Gettler-Ryanincorporated (GR) for the startup of the interim soil vapor extraction (SVE) and groundwater extraction and treatment systems. At that time, the one extraction well (EX -1) was pulsing on and off,'with a pumping rate of approximately 2 gallons per minute (gpm). I discussed the pumping rate with GR and asked if this rate would stabilize the plume. GR stated that they would continue to monitor water levels at the site to determine if EX -1 was being effective. Since then the groundwater pumping rate has dropped from 2 gprn to less than 0.2 gpm. After reviewing the PAR, I contacted Secor by telephone on 21 August and 23 August 2000 to discuss the low pumping rate at EX -1, and the continued movement of contaminated groundwater off-site. Secor agreed that the groundwater contours in the PAR do not show that the groundwater plume is stabilized, and that they planned to redevelop EX -1, and turn on additional extraction wells to control the groundwater plume. To date, this has not been done. Secor also stated that water level contours measured on 19 July 2000 (after the interim groundwater extraction system was started) would be presented in the FRP; therefore, I allowed time for Secor to submit the FRP before commenting on the PAR. Review of the FRP shows the groundwater plume is moving off-site to the west and southwest, so the plume has not been stabilized (see enclosed Figure 3 from the FRP). Secor identified SVE with catalytic oxidation treatment and groundwater extraction with granulated activated carbon filtration as the most effective methods for soil and groundwater remediation at this site. Secor completed SVE testing in July 2000, and concluded that the existing four SVE wells would be sufficient to remediate the soil contamination. However, since groundwater contamination and aquifer parameters are not defined, a final groundwater remediation system design was not submitted in the FRP. Secor's 14 July 2000 Quarterly Progress Report did not include analyses for ethanol, methanol, ethylene dibromide, and 1,2 -DCA, as required by C&A Order #11. A 26 July 2000 letter from Secor stated that these analyses were mistakenly omitted, that monitoring wells were resampled on 24 July, and results would be submitted when all analyses are complete. These analytical results were not included in the 25 August FRP, and, to date, we have not received them as a separate submittal. I requested Secor to provide the results of the 24 July sampling in the next Quarterly Progress Report due 15 October 2000. Based on the information discussed above, additional investigation work is required and a revised PAR/FRP submitted which meets all requirements of C&A Order No. 5-00-704 and the Notice of Violation. During completion of these documents, active soil vapor extraction and groundwater extraction must be continued. The groundwater extraction must stabilize the groundwater plume to prevent movement of MtBE toward Well 12.