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Landscape Master Plan - Gateway Valley - 55 Timber rail Wood plank road to be used at Park and Recreation Bridge Wood plank road bed Figure 3-30: Bridge at Quercus Creek at Park and Recreation Area Landscape Master Plan - Gateway Valley - 55 - Open Space4 Treatments 4. Open Space Zones and Landscape Treatments 4.1 Open Space and Landscape Easement Area objectives The objectives are to: - Create a strong natural landscape framework that knits together the built elements of the community. - Create a gradual transition to non-irrigated, native vegetation. - Ensure adequate fire safety through appropriate landscape design and maintenance. - Restore the creek habitat and enhance the riparian settings at the pond area and slope drainages as part of an overall enhancement of the natural landscape. Landscape plantings create a gradual transition to the non-irrigated natural landscape Landscape Master Plan - Gateway Valley - 58 - Legend Riparian Habitat Riparian Habitat Restoration Open Space Development Buffer Revegetation Back of Lot Easement Pond Area Quarry Cut-Rock Slopes Quarry Hill Open Space Area Residential Area I Eastern Hills Open Space Area The Ponds Swim Facility Hwy 24 Brookside Creek Community Playfi elds Residential Residential Area II Area III Art & Garden Center Residential Area IV Quercus Creek Western Hills Open Space Area Figure 4-1: Natural and Open Space Treatments Landscape Master Plan - Gateway Valley - 59 - 4.2 Development Buffer Areas Development Buffer Area – Plant Palette A native open oak woodland will be established at the transitional areas on the edges of the developed site areas, with scattered tree Trees plantings (Live Oak, Buckeye and California Bay) planted in a range of sizes from liners to 15 gallon size, with a hydroseeded understory of native grasses (refer to Seed Mix #2 and #5 in the Appendix) or alternating swathes of shrubs and grasses. Trees and hydroseed will be planted/seeded during the fall prior to winter rains, and non-irrigated. Trees will be staked and wrapped for deer-protection. Where retaining walls have been introduced, they will be planted with a native shrub understory and grasses and trailing plants at the tops of walls to obscure and soften the walls. Boulders will also be placed at the base and sides to help in the transition to natural landscape. A wood timber rail will be secured to the top of walls where needed. See Figure 4-1 for Development Buffer areas. 4.2.1 Sunrise Hill Neighborhood Planting Buffer Live Oak Madrone A native oak woodland will be re-established within the eastern project area that abuts the Sunrise Hill neighborhood. Within this area, Shrubs new plantings will create a planting buffer along the property edge, the proposed detention basin and the emergency vehicle access. Buffer plantings will include scattered tree plantings (Live Oak and Buckeye on slopes, Sweet Bay around the perimeter of the detention basin) in a range of sizes from 15 gallon to 48” box trees, a hydroseeded understory of native grasses (refer to Seed Mix #2 and #5 in Appendix) and informal masses of shrubs (Manzanita, Wild Lilac, Toyon and Coffeeberry). Tree and shrub spacing will comply with Section 6.2, Fire Safety Guidelines and Measures. Trees will be staked and wrapped for deer protection. Please refer to the Sunrise Hill Planting Plan dated October 10, 2006, included in Appendix D. Timber rail Native shrubs Toyon Sunset Manzanita where needed soften wall Plant List Trees * Aesculus californica California Buckeye * Quercus agrifolia Coast Live Oak * Umbellularia Californica Sweet Bay Shrubs Arctostaphylos hookeri ‘Wayside’ Manzanita * Ceanothus gloriosus exaltatus 'Emily Brown' Wild Lilac * Heteromeles arbutifolia Toyon *° Rhamnus californica California Coffeeberry Vines Calystegia macrostegia Morning Glory Vitis californica California Grape Boulders used at base and sides of wals to blend walls into site Grasses & Wildflowers Seed Mix #4 - Development Buffer Native Grass/ Shrub Blend Figrure 4-2: Typical elevation of retaining wall treatment in development buffer area * California native species • Low Fuel Volume species ° City of Orinda Locally Native Species Note: Refer to amended plant lists (Appendices A, B, & C) for complete list of plants Landscape Master Plan - Gateway Valley - 60 - 4.3 Back of Lot Easement Areas Plant List The top and bottom of slope areas within residential areas (See Figure 4-1) will be Trees - Romneya coulteri Matilija Poppy planted with trees in a range of sizes from 15 gallon to 24” box (Live Oaks and Buckeye) -* Aesculus californica California Buckeye -* Rhamnus californica Coffeeberry with a shrub and tall ground cover layer at the bottom of slope for privacy ( Arctostaphylos -* Quercus agrifolia Coast Live Oak -* Rhamnus ‘Mound San Bruno’ Coffeeberry hookeri 'Wayside' , Ceanothus ). The mid-slope area will be more open, with scattered -•* Olea Fruitless Fruitless Olive Rosmarinus ‘Irene’ Rosemary Salvia ‘Allen Chickering’ Sage oaks in smaller sizes from 5 gallon to 15 gallon, a continuous flowering ground cover Shrubs Salvia ‘Aromas’ Sage (Rosemary) and a flowering shrub mass (Monkey Flower, Dwarf Wild Lilac, Rockrose, Arctostaphylos hookeri ‘Wayside’ Manzanita Salvia leucophylla ‘Point Sal’ Point Sal Sage Coffeeberry and Sage ) to be used as accents. - Artemesia californica California Sagebrush - Zauschneria californica California Fuschia -* Ceanothus ‘Centennial’ Wild Lilac - Zauschneria 'Wayne Silver' California Fuschia -* Ceanothus dentatus Dwarf Wild Lilac -* Ceanothus ‘Heart's Desire’ Wild Lilac Ground Covers & Perennials * Ceanothus ‘Julia Phelps’ Wild Lilac Rosmarinus ‘Huntington Carpet’ Huntington Carpet Rosemary - Ceanothus ‘Ray Hartman’ Wild Lilac Salvia leucantha Mexican Sage Back of Lot Easement Areas – Plant Palette Cistus spp Rockrose Salvia leucantha ‘Santa Barbara’ Dwarf Mexican Sage Cistus skanbergii Rockrose Grasses & Wildflowers Cistus danserai decumbens Rockrose Trees Shrubs Seed Mix #3 - Quarry Hill Revegetation Blend Echium fastuosum Pride of Madeira - Heteromeles arbutifolia Toyon Lavandula stoechas Spanish Lavender * California native species - Lupinus albifrons Silvery Bush Lupine • Low Fuel Volume species - Mimulus aurantiacus Monkey Flower ° City of Orinda Locally Native Species - Prunus ilicifolia Hollyleaf Cherry - Quarry Cut-rock Slopes Note: Refer to amended plant lists (Appendices A, B, & C) for complete list of plants California Buckeye Live Oak Wild Lilac Ground Covers & Perennials Monkey Flower Mexican Sage Rosemary Landscape Master Plan - Gateway Valley - 61 - 4.3.1 STEEP SLOPE TREATMENTS A crushed basalt veneer structural fill and 12" native topsoil overlayer are necessary for many 2:1 slopes within the development area, including the residential lots and back of lot easement areas. Trees and shrubs will be planted into amended planting pits filled with native soil. See Figure 4-5. 4.3.2 QUARRY CUT - ROCK SLOPE PLANTING In three areas in Residential Area I (as noted on Figure 4-1) a plant palette suited to a rockier soil Slope planting blends hillside slopes Manzanita situation is proposed to stabilize and blend cut-rock slopes. Plants will be tucked into crevices and shallow Typical Oak tree planting benches and utilize pockets of native soil to create a mid-slope; 5 gal. and 15 gal. hillside Mediterranean planting aesthetic. Quarry cut- size; top and bottom of slope. 15 gal. and 24" box size rock slope areas will be temporarily irrigated for three years. See Plant List on Page 61 for plants to be used Remove crushed basalt from 2:1 finished slope planting pit and replace with in these zones. topsoil 4.3.3 IRRIGATION STRATEGY 12" 12" deep topsoil layer; this layer includes in. surface soil strippings mixed with on- Trees planted in the back of lot easement areas will be site soil material which is suitable for drip irrigated for a minimum of five years to maximize planting. Typical slope groundcover 4'-0" M planting will root and bind soil layer growth. Mid slope drought-tolerant shrubs and Crushed basalt within approximately 3 years. structural fill ground covers will be permanently irrigated utilizing 4'-0" surface basalt layer will be tested Varies to ensure suitability for planting. Any overspray. A biodegradable jute fabric layer may be 3X unsuitable basalt material will be buried utilized in some locations based on the geotechnical Rootball in deep fills away from plantings. Typical engineer’s recommendations. Crushed angular basalt structural fill (Depths vary) Notes: 1. Mulch: A +3" bark mulch layer is required at all groundcover planting areas to inhibit weeds and maintain soil moisture. 2. Tree irrigation: All Oak trees to have drip irrigation on a separate system, to be used for 5 years to maximize tree growth, then discontinued. 3. Shrub and groundcover irrigation: Permanent irrigation of all groundcovers by small rotor sprays on a separate system. Timing of water applications will minimize run-off. Planting will include Mediterranean shrubs and groundcovers tolerant of overspray (such as Rosemary and Rockrose) Figrure 4-3: Typical Slope Soils and Planting Condition Landscape Master Plan - Gateway Valley - 62 - Mass shrubs at top of slopes, (Spanish Plant native Live Oaks and Lavender, Wayside Buckeyes at tops and bottoms Manzanita) of slopes in informal patterns (Live Oak) Scattered oaks in smaller sizes along mid-slope area Continuous low ground cover Residence at mid-slope area (Rosemary, Dwarf Wild Lilac, Coffeeberry, Mass native shrubs at Rockrose, Monkey Flower, base of slopes (Wild native Sage) (See Section 4.3). Lilac,
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