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Revised Site Characterization Work Plan SMH Mountain House,LLC Page 5 4.2.4 Liner Removal and Backfill The FML material and associated appurtenances (piping, sumps, pumps, wiring, etc.) will be removed for recycling or disposal at a sanitary landfill. The excavation will be filled and graded to the original topographic surface. _ 5.0 SCHEDULE AND REPORTING Once SMH receives approval from the Regional Board staff regarding this Site Characterization Work Plan and prior to any construction activity related to decommissioning, SMH will initiate the liner subsoil sampling activities and risk evaluation. An interim report of results will be prepared and submitted to the Regional Water Board for review and approval. If COPC are identified under the reservoirs as a result of the sub-liner soil sampling, the risks associated with any such COPC will be evaluated and discussed in the report; also, a supplemental Work Plan will be included proposing further action, if any, to address remediation or mitigation of risks to groundwater degradation. If no COPC are identified, there is no risk from the subsoil beneath the reservoirs and SMH will schedule decommissioning activities at a future time yet to be determined. The Regional Water Board staff will be notified 2 weeks prior to commencement of any decommissioning construction work. All construction work will be performed in accordance with construction stormwater regulations. Following completion of the regrading activities, a final closure report will be prepared for submittal to the Regional Water Board. This report will include details of residual solids disposal, backfill operations and will include photographs of the final site configuration. The report will include a request for written acknowledgment from the Regional Water Board that the wastewater discharge facilities were decommissioned according to guidance and with the concurrence of the Regional Water Board. 6.0 LIMITATIONS AND SIGNATURES Condor prepared this Work Plan under the direct supervision and responsible charge of a Professional Geologist in the State of California, who is familiar with the information presented in this Work Plan and all of its Attachments. Based on an inquiry of the individuals immediately responsible for obtaining the -- information, the undersigned Professional Geologist believes the information presented to be true, accurate, and complete. Condor is not responsible for the accuracy and completeness of information collected and developed by others. The Work Plan was prepared for SMH at the request of and for the sole use of SMH. If any changes made or errors found in the information used for this Work Plan, the interpretations and conclusions contained herein shall not be considered valid unless the changes or errors are reviewed by Condor and the Work Plan is either appropriately modified or re-approved in writing. The contents of this Work Plan may not be used or relied upon by any other person(s) without the express written consent and authorization of SMH and Condor. Thank you for your time and the attention you have given to this project. Your assistance has been greatly appreciated. If you have any questions regarding the Revised Site Characterization Work Plan, please contact John Kramer at 209.532.0388, extension 2032. Respectfully submitted, CO OR EARTH TECHNOLOGIES, INC. Kt3 V40.W2 r2 John H.Kramer, PhD Certified Hydrogeologist, CHG No. 182 srPoc,OQ� q�OF G %.A CONDOR