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Geweke Land Development and Marketing 15 June 2001 <br /> 16 South Cherokee Lane, Lodi - 2 - <br /> 3. <br /> 2 -3. Reducing the monitoring frequency for wells EW-1,MW-6, -10, -11, -12, and-13 from quarterly to <br /> annually, and reduce the reporting of EC,pH, and dissolved oxygen for these same wells. <br /> We agree to reducing the monitoring frequency from quarterly to annually for wells EW-1, MW-6, <br /> -10, -11, and-13,but not MW-12. EX-1 is located near the center of the known groundwater plume, <br /> and monitoring wells are located both upgradient and downgradient of this well. EX-1 has been non- <br /> detect for all constituents except 1,2-dichloroethane(1,2-DCA). MW-6 and-10 are upgradient of the <br /> site, and MW-11 and-13 are cross gradient of the site, and these wells are non-detect for all <br /> constituents. MW-12 is the farthest downgradient monitoring well, and 1,2-DCA was first detected <br /> in MW-12 in March 2001. This well must be sampled quarterly to confirm or refute groundwater <br /> contamination at this location. <br /> 4. Replace EPA Method 601 with EPA Method 8260B for VOC analyses. <br /> We agree that EPA Methods 601 and 602 are no longer acceptable so they are to be replaced by EPA <br /> Method 8260B. <br /> 5. Eliminating analysis for VOCs in wells MW-1, -2, -6, -10, and-11. <br /> We do not agree to eliminating analysis for VOCs in wells MW-1, -2, -6, -10, and-11. Historically, <br /> there have been low detections of contaminants in these wells, and continued monitoring is <br /> necessary. Monitoring wells MW-1 and-2 are already on an annual sampling frequency, and as <br /> discussed above,we believe it would be reasonable to reduce the sampling frequency for monitoring <br /> wells MW-6, -10, and-11 from quarterly to annually. <br /> Based on review of AGE's Revised Schedule and discussions with AGE, a draft MRP for Geweke at <br /> 16 South Cherokee Lane in Lodi is attached for your review and comment. By 29 June 2001, Geweke <br /> (or their representative)must submit written comments on the attached draft MRP prior to us finalizing <br /> the draft MRP. 'the <br /> shall not implement any changes to MRP No. 93-701 unless and until a revised <br /> MRP is issued the Executive Officer. <br /> Please contact arty Hartzell at(916) 255-3115 with any questions or comments. <br /> J <br /> GORDON E OGGS <br /> Undergro d Tank Program Manager <br /> Attachme t <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Brian Millman, Advanced GeoEnvironmental, Incorporated, Stockton <br />