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CONDOR EARTH TECHNOLOGIES INC 21663 Brian Lane• P.O. Box 3905 Sonora CA 95370 Phone 209.532.0361 R FAX 209.532.0773 CONDO R www.condorearth.com Condor Project No. 4601X July 23, 2009 JUL 2 72009 Brendan Kenny ENVIRONNIEN f I1EAITH California Regional Water Quality Control Board PERMITISERVICES Central Valley Region 11020 Sun Center Drive,No. 200 Rancho Cordova,CA 95670-6114 Subject: Second Revised Site Characterization Work Plan for Effluent Reservoirs 1A, 1B, and 2 Mountain House Wastewater Reclamation Facility Mountain House,San Joaquin County,California Dear Mr. Kenny: This letter is the Second Revised Site Characterization Work Plan(Work Plan) that describes activities to be undertaken at the Mountain House Treatment Plant Reclamation Areas and Reservoirs IA, 1B, and 2. Changes to the previous submittal dated March 23, 2009 include correcting a reference from I to 1B in section 4.2.1 and specifying 8-oz. jars be used so there will be no question that adequate sample for _ subsequent discrete sample testing will be available if needed. The objective of this work is to adequately characterize the soil underlying the discharge areas to determine if groundwater under the reservoirs is at greater risk of degradation than nearby background areas. This work was prepared at the request of SMH Mountain House, LLC (SMH). SMH seeks to decommission the land discharge facilities and to regrade the site to the original topographic surface. SMH seeks guidance from the California Regional Water Quality Control Board(Regional Water Board)with the decommissioning process. 1.0 SUBMITTAL HISTORY The following submittals and contacts, listed in reverse chronological order, have occurred related to Regional Water Board guidance for decommissioning the facilities. These will be referenced by number in later sections of this Work Plan. 1. On or about December 16, 2008, Tim O'Brien of the Regional Water Board and John Kramer of Condor Earth Technologies, Inc. (Condor) discussed the letter Response to Comments dated October 22, 2008. Mr. O'Brien requested that the letter with response to comments and the original Work Plan be consolidated into one document. " 2. On October 22, 2008, SMH submitted a letter "Response to Comments" prepared by Condor, including data on earthen materials in the ponds to demonstrate that no soil is present. 3. On July 21, 2008, the Regional Water Board provided a "Workplan Review, Site Closure Characterization Work Plan..." 4. On June 26, 2008, monitoring of Reclamation Area 1 required by Order No. 98-109 was informally waived in an email from Tim O'Brien because the facilities are no longer used for land discharge.