Ariey Lane Minor Subdivision, Rezone, Prelim. & Final Dev. Plan; MS20-0010, RZ22-3264, & DP22-3002

Ariey Lane Minor Subdivision, Rezone, Prelim. & Final Dev. Plan; MS20-0010, RZ22-3264, & DP22-3002

The applicant is requesting approval of a vesting tentative map to subdivide the subject 6.18-acre parcel into three parcels, resulting in an approximately 2.86-acre (gross) Parcel A, an approximately 2.51-acre Parcel B, and an approximately 0.81-acre Parcel C. Access to the minor subdivision would extend from Ariey Lane, a private road, via an existing bridge that crosses Grayson Creek. Proposed site improvements include an extension of Ariey Lane from the bridge as a new 20-foot-wide private road within a 25-foot private access easement with slopes up to a 20% gradient. No structural improvements are proposed for the existing bridge. Water, electrical, telecommunication, and other utility extensions as needed would be attached beneath the bridge using an existing utility trapeze. Additional site improvements include curbs, gutters, three bioretention basins for stormwater control, a drainage outfall and headwall approximately 1 foot in height, and an 8-inch rock over coir riprap outfall within the creek area adjacent to the bridge for erosion control. It is anticipated that for the future private roadway and future residential foundation pads the project will entail ±4,100 cubic yards (CYS) of cut and ±4,100 CYS of fill for a zero (0) net CYS of grading. The applicant is also seeking approval to construct improvements within the approximately 1.32-acre creek structure setback (CSS) easement area (OR-303003, recorded 2002) spanning the southernmost area of the property. The improvements include approximately 945 square feet of the private roadway and curbs extending from the bridge, approximately 380 square feet of a stormwater treatment bioretention basin (IMP 3), a drainage outfall and headwall, and retaining walls appurtenant to these improvements. In addition to development rights within the CSS easement area being granted to the County, Section 914-14.014 of the County Ordinance prohibits any permanent structure within the creek structure setback other than drainage structures. The applicant has requested an exception to this Code requirement, citing the unique topographic constraints of the site. The upper northern corner of the property has been protected through an approximately 1.98-acre scenic easement (OR-303002, recorded 2002) and will remain undeveloped. No changes are proposed that would reduce the square footage of either restricted development area. The applicant requests a rezone of the property from R-10, Single-Family Residential to P-1, Planned Unit District (P-1) and approval of a Preliminary and Final Development Plan for development of each parcel. A total of five dwelling units are proposed, including two attached accessory dwelling units (ADU). Future approval of any ADU will require a separate ministerial application. The proposed development of each parcel is described below: • Parcel A: 6,244-square-foot, two-story, single-family residence up to 26 feet in height, an 886-square-foot garage, driveway, pool, and seven retaining walls up to 7 feet in height. • Parcel B: 6,545-square-foot, two-story, single-family residence up to 32 feet in height, an approximately 990-square-foot ADU within the residential building, an 1,848-square-foot garage, driveway, and three retaining walls up to 6 feet in height. • Parcel C: 4,424-square-foot, two-story split-level, single-family residence stepping up the existing grade with a height up to 28 feet, an approximately 747-square-foot ADU within the residential structure, a 974-square-foot garage, driveway, and two retaining walls up to 6 feet in height. The applicant also requests approval of a tree permit for project-related impacts to twenty-eight code-protected trees, including the removal of thirteen code-protected trees (one (1) Aleppo pine tree, three (3) Arizona cypress trees, seven (7) coast live oak trees, and two (2) incense cedar trees) and work within the driplines (construction, trenching or grading) of fifteen code-protected trees (one (1) valley oak tree, two (2) California bay trees, and twelve (12) coast live oak trees) located on the subject property. Project impacts are due to the trees being located within the footprint of site improvements or the new residential structures. In addition, several trees would be removed due to poor health or condition as recommended by the project arborist.

Lafayette, Pleasant Hill

Contra Costa

Citywide, Countywide, San Francisco Bay Area

California Air Resources Board (ARB), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)

California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)

Residential (Units 3, Acres 6.18)

Planned Unit Development, Rezone, Land Division (Subdivision, etc.)

Aesthetics, Biological Resources, Cultural Resources, Geology/Soils, Mandatory Findings of Significance, Wetland/Riparian, Wildfire