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MOUNTAIN HOUSE SAN JOAQUIN COUNTY MITIGATION MONITORING PROGRAM Impact Mitigation Measure Monitoring Person/Agency Timing or Requirements Responsible' Frequency of Monitoring' M4.7-0 a)Preliminary Solis Report. The soils report required for each subdivision shall Review Preliminary SJCDPW DP Shallow groundwater at the project site could identify the seasonal high groundwater level at the site of any detention/retention Soils Report. present adverse conditions for construction basins proposed as part of the stormwater management system. The report shall of foundations and detention/retention provide recommendations for appropriate design elevations for the basins. Ultimate development of the project detention/retention basins that would avoid saturation or partial filling by site could cause a rise in shallow groundwater. The report shall specifically address the potential for increased groundwater levels as a result of removal of groundwater levels caused by removal or disruption of existing subsurface drains. subsurface drains. The report will provide recommendations for subsurface drains for all newly constructed structures or facilities. These recommendations all include provisions for routing and disposal of drain discharges that will not result in adverse flooding or saturation hazards within other areas of the project site. vlsuAL quALlry M4.8-1a) Specific Additional trees shall be provided along Old River where necessary to screen the Pe The proposed project would significantly project from boaters,while still affording views of the water for people using the neighborhoods of Specific Plan alter the existing rural visual quality of the regional park. Along Old River,the landscaped area shall be planted with species adjacent to Old adjacent to Old site as seen from local roads,regional of trees and shrubs compatible with existing riparian vegetation. Species shall also River,and Final River,and at Final freeways,and proposed public pathways, be chosen to provide effective screening so that the public using the levees for Park Plan(CSD)for and Construction walking or bicycling would have a limited view of development on site. Provisions Old River Regional Plans. to accomplish this shall be included in the Park and Open Space Plan. Park PUBLIC HEALTH AND SAFETY M4.10-2 a)An information packet shall be prepared by the developer;the packet shall Review of first SP SJCCDD/MHCSD First SP Potential health impacts may result from include a summary of major studies regarding EMF effects and a list of reference w/Transmission line w/Transmission public exposure to PCBs associated with studies,with copies available to residents upon request. The information packet easements through lines easements transformers or electromagnetic fields shall be updated annually. residential land through residential associated with overhead elecMcal lines. uses. land uses. Annually thereafter. M4.10-7 a) Vapor barriers and/or vents shall be included in designs for utility trenches that Review vapor SJCDPW Final Map Increased development along the natural are not under the jurisdiction of the PUC crossing or within 100 feet of the high barrier designs. gas pipelines traversing the site could pressure gas pipelines to reduce the potential for the migration and accumulation increase the risk of pipeline rupture and fire of gas,leaked from a pipeline,in utility trenches. The design of the utility trenches or explosion which could result in death and shall be reviewed and evaluated by the Department of Public works prior to final l injury or property damage. map approval. BIOLOGICAL RESOURCES M4.11-4 a)A habitat protection plan for Mason's lilaeopsis and other special-status taxa Review of Habitat SJCCDD SPs for areas In addition to San Joaquin kit fox and which may be encountered during further detailed surveys,shall be prepared prior Protection Plan. along Old River Swainson's hawk,proposed development to approval of any specific plan along Old River. Other special-status taxa of would affect a number of other special-status concern include delta smelt,Sacramento splittail,winter-run chinook salmon,and taxa. California hibiscus.The habitat protection plan shall be prepared by a qualified plant ecologist in consultation with and meeting the approval,to the extent legally required,of representatives of the USFWS and CDFG. The plan shall provide for the protection of Identified populations,addressing potential impacts associated with boating,marina development,water diversion,storm drainage runoff,levee modifications,and recreational use of levee habitat. PAGE 5