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MOUNTAIN HOUSE SPECIFIC PLAN II Figure 15.38: Existing Flood Hazard Zones, FEMA 100 -year. Figure T5.3a Existing Flood Hazard %ones SS 5 200 -Year; and Figure 15.4: North Area Grading Sections). Stabilization of the existing levee will be employed as necessary to protect the CId River Regional Paris area. The grading approach involves the following: ■ Material from the upper elevation areas along Byron Road will be cut and used as fill in the lower elevation areas along Old River as described in the Conditional Letter of Map Revision issued by FEMA. • The existing levee will be graded and reinforced to meet FEMA certification requlrements far park use, if any. Residential building pads along Old River wiJi range from elevation ,n,c4'A13,2 to 16 feet (instead of 6.5 to 12 feet as envisioned by the Master Plan). Proposed lake and gelfoRan space areas within Me Neighborhoods north of Syron Road would be lowered to continue to pr❑vide storrrr Conveyance and storage as required in the NHCS b Storm Water Master Plah. Development areas behind the top of the fill area contained within the Old River Regional Parte boundary will drain away from The river, back into secondary and primary collection systems within each Wghborhood, and ultimately to Old River via Mountain House Creek. Lakesioperi space areas within Neighborhood K and L wtll be utilized fpr water quality treatment and flood storage. Gravity flow and discharge to Mountain House Greek will be thfough flap gates, eliminating the need for pumps as envisioned by the Master Plan SPJI Implementation Measures i. MHCSD Design and Construction Reouirem ents. All implementing projects sbaII ccmply with the applicable prow Islons of the MHOS❑ Developrnant Standards. 2, N1HCS0 Flood Protection Requirements. All implementing projects shall comply with the applicable provisions of the MHCSD Storm Drainage Master Plan. 3_ FEMA Appiicatlon. After the new river flood protection improvements are constructed along Old River, an application shall be made to the Federal Emergency Management Agency to change the flood insurance maps. d. Amendments to N1HC5D Design_ Manual. The MH CSD Design Manual shall be rev lsed to be consistent with a11 provisions of this Specific Plan related to grading and flood control along Old River. 5_ 5116 200 -Year Flood Protection. For a building oemrtt for any new residence in the tdentlfled SB 5 area, the finished floor elevation shall be no ofeater than 3 feet below the 200 -+wear Urban Level of Flood ProtectTon (ULOPl surface elevation as identified hn the PDVR&r mapping shown as Fkjure 15.313, CHAPTER FIFTEEN STORM DRAtNAGL AND FLOOD PROTECTION PAGE 15.11 Revised 91 t12001 Resolution Template 01/2017