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Flag City Chevron <br /> 6421 Capitol Avenue, Lodi - 2 - 28 February 2002 <br /> to 75 feet. If this detection is accurate, it is significant and a confirmation sample is therefore warranted. A <br /> discussion of the TPHd identified in groundwater during the fourth quarter sampling was not presented by <br /> AGE in the Q4-2001 Report. Please complete fourth quarter sampling for TPHd, and present a discussion of <br /> TPHd in the Q1-2002 report to explain the detections of TPHd identified in Flag City Chevron wells. <br /> 4. MtBE was identified in Rocky's Domestic Well(RDW-1)at 13 micrograms per liter(µg/1)after two quarters <br /> of non-detect samples below 1 µg/1. Additionally,MW-11D,which is approximately 15 feet lateral distance <br /> from RDW-1 and screened from 130 to 150 feet showed MtBE at 8 µg/1 after two quarters of non-detect <br /> samples below 1 µg/1. These detections confirm that RDW-I is acting as a conduit for MtBE-impacted water <br /> to move from the shallow to the deep aquifer. RDW-1 is scheduled to be destroyed on 6 March 2002 <br /> following connection of Rocky's Restaurant to municipal water. Once RDW-1 is destroyed,the remaining <br /> contamination in groundwater may be affected by operation of other water supply wells in the area, and Three <br /> B's domestic water supply well at approximately 280 feet west of RDW-1 is the closest. <br /> AGE stated that the extent of groundwater contamination has not been fully defined west of RDW-1. The <br /> closest monitoring well west of Three B's MW-4(within 40 feet of RDW-1)is Three B's MW-6 at more than <br /> 200 feet. Cone penetrometer testing(CPT)boring P-17 was completed between these two points in <br /> March 2000, and MtBE was identified at 40, 58, and 83 feet below ground surface. Based on this information, <br /> a cluster of monitoring wells is necessary west of RDW-1 to monitor the first three groundwater zones. Please <br /> review previous data collected in this area, and submit a plan of work to install additional monitoring wells. <br /> Based on the possibility of future groundwater extraction in this area,we believe 2-inch diameter monitoring <br /> wells would be better suited for installation versus a multi-level well. <br /> By 15 April 2002, please reply to the above comments and requests in the QI-2002 Quarterly Status Report. The <br /> requested plan of work may be included in the QI-2002 Report, or submitted under separate cover. Please notify <br /> me at least five business days prior to any site work or sampling. If you have any questions or comments, please <br /> call me at(916)255-3115. <br /> Marty Hartzell, R.G. <br /> Associate Engineering Geologist <br /> cc: Mr. Mark Owens,UST Cleanup Fund, SWRCB, Sacramento <br /> Mr.Mike Infurna, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Timothy J. Cuellar, Advanced GeoEnvironmental, Incorporated, Stockton <br /> Mr. Scott Rishwain,Rishwain&Rishwain, Stockton <br /> Mr. Ben Guzman, San Joaquin County Municipal Utilities, Stockton <br /> Ms.Beverly Benigno,Rocky's Restaurant,Lodi <br />