20250515-005: January Drive Flood Reduction Project Staff Presentation — original pdf

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WALNUT CREEK - JANUARY DRIVE FLOOD REDUCTION PROJECT SP-2022-0531D Eric Brown Hydrogeologic Reviewer Watershed Protection Department PROPERTY DATA • WALNUT CREEK WATERSHED • WATER SUPPLY URBAN CLASSIFICATION • CRITICAL ENVIRONMENTAL FEATURES ON SITE • COUNCIL DISTRICT 1 BACKGROUND • • HISTORIC FLOODING CONCERNS FOR FOUR SEASONS NEIGHBORHOOD UPSIZE OF STORMWATER INFRASTRUCTURE AND ABANDONMENT IN PLACE OF EXISTING INFRASTRUCTURE CODE REFERENCE •TITLE 25 – LAND DEVELOPMENT CODE, CHAPTER 25-8-281(C)(2)(B). VARIANCE REQUEST REQUEST TO VARY FROM LDC 25-8- 281(C)(2)(B) TO ALLOW CONSTRUCTION WITHIN 50-FOOT OF SEEP AND RIMROCK CRITICAL ENVIRONMENTAL FEATURE (CEF) SETBACKS. SEEP HORIZON SEEP HORIZON and RIMROCK EXISTING 24” OUTFALL. HEADWALL TO REMAIN 24” will remain in place 30” will be upsized to 48” VARIANCE RECOMMENDATION FINDING OF FACTS HAVE BEEN MET. STAFF RECOMMENDS THE APPROVAL OF THIS VARIANCE WITH THE CONDITIONS BELOW: • • • • • REPAIR RILL EROSION THROUGHOUT THE AREA, PLACE GROW ZONE SIGNS AT 100 FT INTERVALS, 30 FT FROM BACK OF CURB, EXPAND NATIVE PLANTING AND SEEDING THROUGHOUT THE GROW ZONE AREA, AND NATIVE SEEDING IN THE AREA BETWEEN THE GROW ZONE AND THE CURB (NO PLANTINGS OUTSIDE OF THE GROW ZONE; SOD AREA FOR STABILIZATION CAN REMAIN), ENSURE THAT PLACEMENT OF TOPSOIL, TEMPORARY IRRIGATION AND WEED MANAGEMENT ARE INCLUDED WITH THE RESTORATION, REMOVE REMAINING DRIVEWAY APRONS AND REPLACE WITH CURB AND GUTTER. RESTORATION PLAN QUESTIONS?