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C } <br /> ET <br /> CONDOR EARTH TECHNOLOGIES INC. <br /> 21663 Brian Lane <br /> P.O. Box 3905 <br /> Sonora, CA 95370 <br /> March 12, 1999 (209)532-0361 <br /> FAX (209)532-0773 <br /> Mr. Joe Mello <br /> California Regional Water Quality Control Board—Central Valley Region <br /> 3433 Routier Rd. <br /> Sacramento, CA 95827-3098 <br /> RE: Amendment to Technical Report: Alternative Method for Treatment of Groundwater Triple <br /> E Produce Facility; Condor Project No. 0809 <br /> Dear Mr. Mello: <br /> As discussed at the March 9, 1999 meeting between representatives of Triple E Produce and the <br /> Regional Board staff, Condor hereby submits on behalf of Triple E Produce an amendment to the <br /> Technical Report:Alternative Method for Treatment of Groundwater at the Triple E Facility, <br /> dated January 15, 1999. The selected alternative method is designed to substantially decrease the <br /> volume of treated water that infiltrates through the bottom of the aeration pond. This selected <br /> alternative, described below, amends our January 15, 1999 Technical Report and satisfies the <br /> Regional Board Staff request contained in the Notice of Violation (NOV) dated December 1, <br /> 1998. <br /> Alternative 5: Continue groundwater pumping at present rate and, within the capacity <br /> constraints and seasonal availability of the treatment plant plumbing, divert as much <br /> groundwater flow as reasonably possible from the aeration pond to the treatment plant with <br /> treated effluent disposal to the apricot orchard spray field in accordance with WDR 96-118. <br /> Alternative 5 is the preferred alternative that satisfies the following criteria listed in the <br /> Technical Report: <br /> I. Immediately reduces groundwater recharge through the aeration pond, and is likely to result <br /> in reduced mounding at MW-1 <br /> 2. Will allow existing contamination in the area of MW-1 to flow down-gradient to the <br /> extraction wells for removal <br /> 3. Maintains the existing level of groundwater removal and hence treatment at the lower end of <br /> the plume <br /> 4. Maximizes the utilization of the existing treatment plant and permitted disposal area <br /> ENVIRONMENTAL 0 GEOLOGICAL 0 ENGINEERING 0 GEOTECHNICAL <br />