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L"ONDOR EARTH TECHNOLOGIES INC <br /> 1 21663 Brian Lane • P.O. Box 3905 <br /> Sonora CA 95370 <br /> Phone 209.532.0361 <br /> FAX 209.532.0773 <br /> CONDOR www.condorearth.com <br /> Condor Project No. 4601X n[EC[E� V �� <br /> May 29, 2009 <br /> Timothy R. O'Brien JUN 0 1 2009 <br /> California Regional Water Quality Control Board ENVIRONIv1ENT HEALTH <br /> Central Valley Region PERIVIMSERVICES <br /> 11020 Sun Center Drive,No. 200 <br /> Rancho Cordova,CA 95670-6114 <br /> Subject: Revised Site Characterization Work Plan for Effluent Reservoirs IA, 1B, and 2 <br /> Mountain House Wastewater Reclamation Facility <br /> Mountain House, San Joaquin County, California <br /> Dear Mr. O'Brien: <br /> This letter is a Revised Site Characterization Work Plan (Work Plan) that describes activities to be <br /> undertaken at the Mountain House Treatment Plant Reclamation Areas and Reservoirs 1 A, 1 B, and 2. The <br /> objective of this work is to adequately characterize the soil underlying the discharge areas to determine if <br /> groundwater under the reservoirs is at greater risk of degradation than nearby background areas. This <br /> work was prepared at the request of SMH Mountain House, LLC (SMH). SMH seeks to decommission <br /> the land discharge facilities and to regrade the site to the original topographic surface. SMH seeks <br /> guidance from the California Regional Water Quality Control Board (Regional Water Board) with the <br /> decommissioning process. <br /> 1.0 SUBMITTAL HISTORY <br /> The following submittals and contacts, listed in reverse chronological order, have occurred related to <br /> Regional Water Board guidance for decommissioning the facilities. These will be referenced by number <br /> in later sections of this Work Plan. <br /> 1. On or about December 16, 2008, Tim O'Brien of the Regional Water Board and John Kramer of <br /> Condor Earth Technologies, Inc. (Condor) discussed the letter Response to Comments dated <br /> October 22, 2008. Mr. O'Brien requested that the letter with response to comments and the <br /> original Work Plan be consolidated into one document. <br /> 2. On October 22, 2008, SMH submitted a letter "Response to Comments" prepared by Condor, <br /> including data on earthen materials in the ponds to demonstrate that no soil is present. <br /> 3. On July 21, 2008, the Regional Water Board provided a "Workplan Review, Site Closure <br /> Characterization Work Plan..." <br /> 4. On June 26, 2008, monitoring of Reclamation Area 1 required by Order No. 98-109 was <br /> informally waived in an email from Tim O'Brien because the facilities are no longer used for land <br /> discharge. <br /> 5. On March 18, 2008, SMH submitted a Site Closure Characterization Work Plan Reclamation <br /> Area 1, Reservoirs IA, IB, and 2, prepared by Condor, dated March 17, 2008. <br />