ARCHIVED REPORTS XR0009279 - Laserfiche WebLink

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• Steve and Genes Service 2315 El Dorado, Stockton Page 2 groundwater elevation, flow direction,or some other factors EHD agrees with GU's proposal for additional groundwater wells to the north and northeast of the site, and notes that additional wells may be requited to fully delineate and monitor impacted groundwater The well toward the east should be located in the most common down-gradient position as indicated by historical groundwater flow directions Installation of additional sample collection points such as monitoring wells, borings, or direct push points in directions other than north and northeast should also be considered at this time to maximize cost-effectiveness GTI stated in the above-referenced 4`6cQMR 2001 that future quarterly monitonng events=//not include analysis by EPA method 8260 Ina meeting on April 17, 2001, Central Valley Regional Water Quality Control Board (CVRWQCB) agreed with EHD to discontinue analysis of oxygenated fuel compounds by EPA Method 8260 as stated in the report,with the condition that the 8260 test be performed once a year,i e the first quarterly sampling event of the year However, please be aware that any recommendation to discontinue analyses for any chemicals of concern, substitution of testing methods, or modification of quarterly monitoring schedules, etc ,requires review and approval by EHD Please recommend changes to the monitoring program as seems appropriate,but EHD requests that such unilateral statements be omitted from future reports or letters If you have any questions, please contact Jeffrey Wong at (209) 468-0335 Donna Heran, RENS,Director Environmental Health Division i i Jeffrey Wong, REHS Nuel C Henderson,Jr, RG LOP/Site Mitigation Unit IV LOP/ Site Nfitigation Unit IV Cc CRWQCB, Central Valley Region—Marty Hartzell Cc ,/Geological Technics, Inc - Raynold I Kablanow