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PUD-74 Environmental Checklist <br />recharge, and recreation uses. The top of the bank of the lake is approximately 85 feet from the <br />northern perimeter of the project site. The lake's slope bank is steeply sloped (roughly 1.5:1 to <br />2:1). Portions of the slope bank are unstable and Zone 7 is working with the former owner to <br />repair it. <br />Geotechnical Study <br />A geotechnical investigation3 was prepared by Cornerstone Earth Group to evaluate the physical <br />and engineering properties of the subsurface soils and prepare recommendations for site work <br />and grading, building foundations, flatwork, retaining walls, and pavements. <br />From a geotechnical engineering standpoint, Cornerstone Earth Group states that the proposed <br />development can be constructed as planned, provided that the recommendations contained in the <br />report are incorporated into the project design and grading. Examples of recommendations <br />include: remove the existing soil stockpiles and only reuse them for backfill if they meet certain <br />criteria; compact soils in accordance with ASTM D1557 (latest version) requirements; and post- <br />tensioned concrete mat foundations need to be based on procedures developed by the Post- <br />Tensioning Institute (latest edition) and as referenced in the 2007 California Building Code. <br />Standards of Significance <br />For purposes of this environmental document, an impact is considered significant if the proposed <br />project would: <br />Result in a project being built that will either introduce geologic, soils, or seismic hazard <br />by allowing the construction of the project on such a site without protection against those <br />hazards. <br /> Less Than <br />Potentially Significant Less Than <br />Significant With Mitigation Significant No <br />Issues ImDBCI Incorporated Impact Im ac[ <br />P <br />Geoloav and Soils <br />Would the project: <br />a) Expose people or structures to potential <br />substantial adverse effects, including the risk of <br />loss, injury, or death involving: <br />i) Rupture of a known earthquake fault, as <br />delineated on the most recent Alquist-Priolo <br />Earthquake Fault Zoning Map issued by the <br />State Geologist for the area or based on other <br />substantial evidence of a known fault? Refer <br />to Division of Mines and Geology Special <br />^ ^ ^ ^D <br />18 <br />