ITEM 5 EXHIBITS A-H - Laserfiche WebLink

BLACK AVENUE RESIDENTIAL DEVELOPMENT 648-26-1 Page 7 were prepared by dam owners as required by the State Office of Emergency Services; they are intended for planning purposes only. Based on our review of these maps, the site is located within a dam failure inundation area for the Del Valle Reservoir. SECTION 5: CONCLUSIONS 5.1 SUMMARY From a geotechnical viewpoint, the project is feasible provided the concerns listed below are addressed in the project design. The preliminary recommendations that follow are intended for conceptual planning and preliminary design. A design-level geotechnical investigation should be performed once site development plans are prepared indicating where proposed structures are planned. The design-level investigation findings will be used to confirm the preliminary recommendations and develop detailed recommendations for design and construction. Descriptions of each geotechnical concern with brief outlines of our preliminary recommendations follow the listed concerns. Redevelopment considerations Presence of undocumented fill Soil corrosion potential 5.1.1 Redevelopment Considerations As discussed, the site is currently occupied by an existing building that is currently used as an AT&T facility and is surrounded by flatwork, underground utilities, parking lots, site fixtures, and landscaping. We assumed that the existing improvements will be demolished for the construction of new residential structures and streets. Potential issues that are often associated with redeveloping sites include demolition of existing improvements and foundations, buried sumps, abandonment of existing utilities, and undocumented fills. 5.1.2 Undocumented Fill Our explorations encountered undocumented fills to a depth of up to 2½ feet below the existing surface. Our experience with similar previously developed site indicates a few feet of undocumented fill may be locally present across the site, especially beneath the existing building. On a preliminary basis, we recommend that any existing undocumented fill be over- excavated and re-compacted beneath any new at-grade structures or prior to placing any new fill. The lateral extent and depth of existing fills should be further investigated during the design- level investigation. On a preliminary basis, new buildings can likely be supported on a shallow foundation consisting of conventional footings or a rigid mat foundation, as discussed in the “Foundations” section. vestigation findings will be used to confirm the preliminary vestigation findings will be used to confirm the preliminary recommendations and develop detailed recommendations for design and construction. recommendations and develop detailed recommendations for design and construction. Descriptions of each geotechnical concern with brief outlines of our preliminary Descriptions of each geotechnical concern with brief outlines of our preliminary Redevelopment Considerations As discussed, the site is currently occupied by As discussed, the site is currently occupied by an an existing building is surrounded by is surrounded by flatwork, flatwork, underground utilities, parking lots, site fixtures, and underground utilities, parking lots, site fixtures, and that the existing improvements will be demolished for the that the existing improvements will be demolished for the construction of new residential structures and streets.construction of new residential structures and streets. with redeveloping sites include demolition of existing improvementswith redeveloping sites include demolition of existing improvements , abandonment of existing utilities, and undocumented fills. , abandonment of existing utilities, and undocumented fills. mented Fillmented Fill explorations encountered undocumented fills to a depth of up to explorations encountered undocumented fills to a depth of up to