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MOUNTAIN HOUSE NEIGHBORHOOD"17'PROJECT INITIAL STUDY Conditions of Approval Geology and Soils GEO-1: The following recommendations were made in the project's Geotechnical Report(as distinguished from the Geotechnical report for the Bethany Elementary School)and these recommendations shall be followed as written in the original report and summarized below: • Foundation support shall be strengthened and stiffened shallow foundations,slabs,or mats,with specific design recommendations presented in the Geotechnical Report. • Critical infrastructure improvements shall be designed with the potential ground deformation in mind. Flexible connections shall be provided where critical underground utilities enter buildings to accommodate the anticipated differential movements due to liquefaction. • Given the presence of potentially-liquefiable deposits underlying much of the site and the potential for seismically-induced ground deformation,it was recommended that a Seismic Zone Factor(Z)of 0.4 be used for the design of emergency and critical facilities. These standards are recommended even though the site is located in Uniform Building Code(UBC)Seismic Zone 3. _ GEO-2: The following recommendations of the project's Geotechnical Report shall be implemented: • On-site and off-site soil that is used for engineered fill shall meet the specifications of the Geotechnical Report. • A sample of proposed import soil for engineered fill shall be tested prior to use to determine if it is suitable as engineered fill. • Any open cuts shall be in compliance with applicable OSHA regulations(California Construction Safety Orders,Title 8)and shall be closely monitored for evidence of incipient instability. • Dewatering may be necessary,given the depth to groundwater at the site. Any dewatering design shall be submitted for review by the geotechnical engineer prior to construction. • At the time of grading,depth to groundwater shall be determined,and at a minimum,the groundwater shall be lowered and maintained at least 2 feet below the bottom of the excavation. • Prior to issuance of building permits,more site-specific investigations involving more detailed geotechnical exploration shall be completed. At this phase,the Geotechnical Report included only 24 test borings over 365 acres and was intended for use in preliminary planning and design of all of Neighborhood"F". • Piping and utility connections shall be designed to accommodate the estimated maximum foundation settlements. • Foundation soils shall be tested immediately prior to placement of concrete to verify that the soils water content is acceptable. • Prior to issuance of building permits,a detailed grading and drainage plan shall be prepared for all areas subject to development. • Additional exploration shall be performed once specific site development plans are available. • A qualified inspector shall be present at the site to observe and advise during site preparation,earthwork,grading,and construction of foundations,slabs on grade and earth- retaining structures. • If more than two years elapse between the date of the Geotechnical Report(January-1999)and beginning of construction,the Geotechnical Report shall be updated. _ Hydrology and WaterQu#14y_ HYDRO-1: The applicant shall provide specific design and function information on the proposed interim water quality basin,shown on the Carlson,Barbee,and Gibson exhibit (Figure 3).The design of the basin shall conform to design parameters set forth in the California State Best Management Practices Manual and shall be reviewed and approved by the Mountain House Community Services District._This Vproval shall occur at the time of review of the Site Improvement Plans andprior to issuance of building permits. HYDRO-2: A detailed interim storm water pumping plan shall be developed.At a minimum,the plan shall specify the following:the number of pumps,how they would be mobilized-their capacity;location;power sources;the operational and maintenance entity;and other general logistical requirements. Yearly maintenance and operation tests shall be completed and documented. The pumps shall be capable of dewatering the storage areas after the 100-year storm event within a time frame approved by the Mountain House Community Services District. This plan shall be reviewed and approved by the Mountain House Community Services District prior to issuance of building rmits.