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MOUNTAIN HOUSE SAN JOAQUIN COUNTY MITIGATION MONITORING PROGRAM Impact Mitigation Measure Monitoring Person Timing or Requirements Agency Frequency of Res onsibW Monitorin 3 d)Specific plans subsequent to Specific Plan I shall include a comparison of the Plan Review. SJCDPW SP actual wastewater generation rates for the project with that calculated in the Master Plan. If wastewater flow rates were higher than those predicted in the Master Plan assuming implementation of water conservation measures,then the next specific plan shall specify actions that would be implemented in the next specific plan to reduce the wastewater generation rates. Approval of the specific plan(s)shall be contingent on the adequacy of the proposed actions to reduce wastewater generation rates to those calculated in the Master Plan,if appropriate. e)If sufficient off-site land cannot be secured for off-site reclamation,then on-site Plan Review/SP. SJCCDD, DP/SP reclamation shall be practiced to the maximum extent possible. Other disposal SJCDPW options,including discharge to Old River and piping the effluent to non-contiguous lands for irrigation,shall be considered,If necessary. If future specific plans propose an interim or permanent wastewater reclamation at a site other than the sites idenfified in the Master Plan,all the policies in the Master Plan and all the adopted mitigation measures,shall be applicable to the proposed alternative reclamation site(s). Any alternative wastewater reclamation site shall also be subject to the permitting requirements of the Central Valley Regional Water Quality Control Board and the Department of Health Services. Prior to the approval of any specific plan utilizing an alternative wastewater reclamation site not specifically identified in the Master Plan/Specific Plan I EIR,site-specific environmental review shall be performed(including but not limited with respect to human contact, biological impact,crop types,etc.)and additional mitigation measures will be adopted to mitigate any site-specific environmental impacts not previously addressed. f)A detailed Salt and Trace Metal Management Plan shall be submitted as part of Review reclamation SJCDPW DP for wastewater the reclamation plan to ensure that irrigation with reclaimed water is a viable long- plan. treatment plant term disposal option and to ensure minimization of salts and trace metals that are discharged to surface waters via the agricultural drains. g)The location and design specifications for the wastewater storage ponds shall be Review reclamation SJCDPW DP for wastewater provided in the Reclamation Plan.The location of agricultural drains within a one- plan. treatment plant half mile radius of the storage ponds and the sources and characteristics of soil that would be used to construct the ponds shall be identified.The design specifications shall address levee and pond bottom permeability,levee stability,and flood protection. \ h) An estimate shall be made of the wastewater volume that may seep from the Documentation from CVRWQCB, DP for wastewater wastewater storage ponds,and an assessment of potential flow paths from pond CVRWQCB. SJCDPW treatment plant seepage shall be determined for the interim and potential permanent reclamation sites. The result of the assessment shall be submitted to the CVRWQCB for determination of whether agricultural drain discharge from land irrigated with reclaimed water would be regulated as a point-source discharge under the NPDES program. The determination by the CVRWQCB shall be provided in the reclamation plan. If it appears likely that the CVRWQCB would regulate the agricultural drain discharge,then assurance that the discharge would be allowed must be documented prior to approval of the reclamation plan. PAGE 2