Standards for Landscaping
Chapter I. General
Sec. 501-1 Purpose and Scope
This division establishes the minimum standards of design, materials, plants, and methods to be used in providing landscaping for developments in Kern County. Landscaping required by development or within a County right-of-way shall be maintained by an entity approved by the Director. A County Service Area (CSA) or Park District are examples of acceptable maintenance entities. All landscaping installed in County right-of-way shall require an encroachment permit from the Roads Department.
Sec. 501-2 Procedures
The following procedures shall be used when landscaping is to be provided:
501-2.01 Maintenance entity/CSA shall be formed prior to approval of landscape plans.
501-2.02 Landscape plans shall be submitted to the Department for checking. All Landscape plans and specifications shall be designed in compliance with Article 10.8 of the Government Code, State and/or local regulations and ordinances relating to water conservation.
501-2.03 Landscape plans shall be approved by the Director and the maintenance entity.
501-2.04 Provisions from Division One, Standards for Streets, Chapter VI shall be met.
501-2.05 The plans shall clearly show the location of all valves, meters, backflow preventers, controllers, sprinkler heads, points of connection to the water system and other such equipment. These exact locations shall be indicated on the "As Built, Record Drawings" to allow easy location. The As Built, Record Drawings shall be prepared by the Landscape engineer/architect. The plans shall clearly show existing and proposed streetlights, utility poles, utility vaults and fire hydrants.
501-2.06 The plans shall be prepared on mylar or similar material on sheets sized to 24 X 36 inches. Title sheet shall identify the development, contain a vicinity map, a key map (scale 1 inch = 200 feet), signature blocks for the Landscape designer and the maintenance entity/CSA.
The balance of the drawings shall be drawn at a scale not less than 1 inch = 20 feet.
Where shrubs or trees are to be planted, the sight distance lines, Plate No. R-71 shall be overlaid on the plans to show that the plants and other improvements do not interfere with clear zones. See Division I Section 106-1 Landscaping, for sight distance requirements.
Chapter II. Irrigation System
Sec. 502-1 General Design Notes
502-1.01 All electrical wiring, controls, and devices shall be U.L. listed, and so labeled. Other approval organizations will be subject to review and approval prior to installation.
502-1.02 The landscape system shall be designed to properly function from service pressure without the use of pumps.
502-1.03 Sprinkler heads shall be selected to limit the amount of overspray on walls, sidewalks, or pavement.
502-1.04 All sprinklers and quick coupling valves shall be installed using double swing joints.
502.105 A master irrigation plan shall be submitted for phased development.
502.106 Irrigation system shall be designed to minimize the number of meters and backflow devices.
Sec. 502-2 As-Built Drawings
502-2.01 Provide a complete "As-Built" record set of prints which shall be corrected daily and show every change from the original drawings and the exact "As-Built" locations, sizes, and kinds of equipment. The "As-Built" prints shall be a set of cronar or similar mylar material. All work shall be in waterproof, red ink and applied to the mylar by a technical pen made expressly for use on mylar material in a neat and complete legible manner.
502-2.02 The As-Builts shall be dimensioned from two permanent points of reference, i.e., building corners, sidewalks, or road intersections, etc., and accurately show the location of the following items:
- Connection to existing water lines.
- Connection to existing electrical power.
- Gate valves, remote control valves, quick couplings and related equipment.
- Routing and/or directional turns of sprinkler pressure lines and control wiring (dimension max. 100 feet along routing).
Sec. 502-3 Controller Charts
Provide three controller charts for each controller supplied, one is to be attached in the controller and the other turned over to the County in the Operation and Maintenance Manuals. Chart attached to controller shall be laminated to prevent weather damage.
The chart shall indicate the area controlled by the automatic controller and shall be the maximum size which the controller door will allow.
Sec. 502-4 Operation and Maintenance Manuals
Prepare and deliver prior to completion of construction, two (2) hard cover three (3) ring binders containing the following information:
502-4.01 Index sheet stating landscape Contractor's address and telephone number, list of equipment with contacts for manufacturer's representative.
502-4.02 Catalog and part sheets on all material and equipment installed.
502-4.03 Complete operating and maintenance instructions on all major equipment.
Chapter III. Materials
Sec. 503-1 PVC Pipe and Fittings
503-1.01 Pressure Main Line Piping and Fittings: Sizes two and one half (2-1/2) inches or larger shall be P.V.C. class 200 ring tite or approved equal.
503-1.02 Pressure Main Line Piping and Fittings: Sizes two (2) inches and smaller shall be Schedule 40 P.V.C.
503-1.03 Non-pressure laterals shall be minimum thickness Schedule 40 P.V.C.
503-1.04 P.V.C. nipples shall be schedule 80 with molded threads.
503-1.05 All pipe and fittings shall conform to specific requirements as follows:
- P.V.C. Pipe: Manufactured from virgin polyvinyl chloride compound in accordance with ASTM D1784 or ASTM D2241, Cell classification 12454B.
- P.V.C. Fittings (solvent weld or thread): Standard weight, schedule 40, side gated, injection molded P.V.C. complying with ASTM D1784, cell classification 13454B, including threads when required.
Sec. 503-2 Electrical (Low Voltage)
503-2.01 Wiring sizing shall be a minimum of #14 direct burial AWG-UF, 600 volt wire, insulation thickness 3/64 inch, utilizing low density high molecular weight polyethylene insulation. Wiring shall be color coded with the common wire to be white and all others in different colors. An extra wire for every six (6) stations shall be looped in each valve box and housed in a box.
503-2.02 Splices, where necessary or permitted, shall be waterproofed using Rain-Bird, Pen Tite, or other approved equal connectors.
503-2.03 All wiring placed under concrete or pavement shall be placed in a sleeve with pull boxes at each end.
Sec. 503-3 Gate Valves
503-3.01 Gate valves three (3) inches and smaller: ASTM B62 brass body, 150 pound saturated steam rated; with screwed joints; non-rising stem; screwed bonnet, solid disc. Provide with handwheel.
503-3.02 All gate valves shall be installed with schedule 80 unions to allow easy removal and placed in an approved valve box.
Sec. 503-4 Backflow Prevention Units
503-4.01 Backflow preventer shall be designed to operate on a "reduced pressure" principle; equipped with gate valves, “Wye” strainers of 125# class brass with 40 mesh monel screen and field test cocks acceptable to the water purveyor and the Environmental Health Services Department.
503-4.02 Prior to acceptance, the backflow prevention unit must be tested and the test results submitted to, and approved by, the Environmental Health Services Department.
The backflow preventer shall be protected by a water protection unit mounted to the concrete slab and shall have adequate insulation blanket attached to the unit.
Sec. 503-5 Automatic Controller
Automatic controllers shall be the fully automatic operation type capable of independently operating the number of stations indicated.
503-5.01 Wall mount type in a housing with locking hinged cover.
503-5.02 Fuse and chassis ground all controller components.
503-5.03 The controller shall be mounted inside a stainless steel, vandalresistant enclosure with a predrilled backboard with 117 volt duplex outlet. Metal conduit shall run from the 117 volt supply to the controller housing. All power within the housing shall be properly phased. The enclosure shall be a Myer MEUG-I-M 285, LeMeur EM 100 or equal.
503-5.04 Controller shall be Rainbird ISC-Sat-B+ (Maxi-Com compatible Independent Station Computer) controlled or approved equal; each valve shall be controlled by a separate station.
503-5.05 The electric meter may be installed in the above cabinet or a separate, approved vandal-resistant enclosure.
Sec. 503-6 Remote Control Valves
503-6.01 Valve type shall be spring-loaded, packless diaphragm activated, normally closed type with plastic body, equipped with adjustable flow control.
503-6.02 Valve solenoid shall be 24 volt a.c. 45 watt maximum, 500 milli-amp maximum surge, corrosion-proof, stainless steel construction, epoxy encapsulated to form a single integral unit.
503-6.03 Provide bleeder valve to permit operation in the field without power at the controller.
503-6.04 All valves shall be installed with schedule 80 unions to provide for easy maintenance.
503-6.05 Identification tags shall be attached to each remote control valve, showing the number that corresponds with the controller sequence. Tags shall be stainless steel or aluminum with the station number stamped with 1/2 inch letters.
Sec. 503-7 Small Lawn Sprinkler Heads
Heads shall have screw adjustments.
Nozzles shall rise a minimum of six (6) inches.
Sec. 503-8 Rotary Sprinkler Heads
Rotary sprinkler heads shall be gear driven with minimum six (6) inch pop-up sprinkler heads.
Part circle heads shall have variable arc setting capability.
Sec. 503-9 Quick Coupling Valves
503-9.01 Type: Heavy-duty, brass construction, with stainless steel internal valve spring, using a 3/4 inch valve key, Rainbird 33 or equal, and shall have a locking rubber cover.
503-9.02 Quick Coupling Valves shall be spaced no more than 100 feet apart or 50 feet from either end of landscape sections.
503-9.03 All Quick Coupling Valves shall be installed in approved round valve boxes.
Sec. 503-10 Small Shrubbery Sprinkler Heads
12 inch minimum pop-up type body shall be used.
Heads shall be fully adjustable.
Sec. 503-11 Valve Boxes
503-11.01 Valve boxes shall be fabricated from a durable plastic material resistant to weather, sunlight and chemical action of soils.
503-11.02 Gate valve boxes shall be round plastic boxes with flex lock covers, CARSON or approved equal.
503-11.03 Remote control valve boxes shall be rectangular plastic boxes, CARSON or approved equal, with hinged covers with flex lock.
Sec. 503-12 Installation - General
503-12.01 All plastic pipe and fittings shall be installed in accordance with manufacturer's instructions for same.
503-12.02 Line Clearance: All lines shall have a minimum clearance of six (6) inches from each other and from lines of other trades. Parallel lines shall not be installed directly over one another.
503-12.03 Pressure lines shall have a metallic detector tape placed above them in accordance with manufacturer's recommendation.
503-12.04 Provide minimum coverage as follows:
Pressure supply lines (two and one half - (2-1/2) inches and smaller):
Pressure supply lines (three (3) inches and larger): 30 inches
Non-pressure lines: 12 inches
Control wire: 18 inches
All wire and pipes under concrete or paving shall be at least 30 inches deep and sleeved.
503-12.05 All lines placed under paving or concrete shall be contained in a Schedule 40 P.V.C. sleeve. The size of the sleeve shall be the minimum size which will allow the interior pipe or control wire to be freely removed and replaced.
Sec. 503-13 Field Quality Control - Adjustment of the System
503-13.01 The Contractor shall adjust all sprinkler heads and valves for optimum performance and to prevent as much as possible any overspray onto walks and roadways.
503-13.02 Testing of Irrigation System
Test all pressure lines under hydrostatic pressure of 150 pounds per square inch, and prove watertight. Testing of pressure main lines shall occur prior to installation of electric control valves, quick couplers or any other equipment that might prevent a proper test from being performed. All piping under paved areas shall be tested under a hydrostatic pressure of 150 pounds per square inch, and proved water tight, prior to paving. Pressure in lines shall be sustained for not less than two (2) hours. If leaks develop, replace joints and repeat test until entire system is proven watertight.
Sec. 503-14 Plant Material
Engineer shall submit to the County for approval a soil nutrient report; this requirement may be waived if the County has on file acceptable information to indicate that it is not warranted. The report shall contain recommendations of soil amendments, fertilizers, as well as an indication of the soil's suitability for the purpose intended.
Small patches of turf which will not lend themselves to maintenance with riding mowers will not be acceptable, particularly narrow strips which will be costly to maintain. Encouraged are the use of ground cover plants with a few shrubs; the use of trees will be allowed where the trees or their overhang do not interfere with the sight distance at intersections. Trees shall not be a type which have a lot of surface roots or drop fruit, or are a maintenance problem. Trees when planted near concrete or paving shall be planted with root guards. All plants shall be tolerant of and readily adaptable of the climatic area in which they are to be planted. Trees which exceed a four (4) inch diameter trunk at 10 years growth shall not be placed in the right-of-way without specific approval from the Roads Department. No trees shall be planted within 20 feet of a street light pole base.
Sec. 503-15.01 Multi-Use Trail Fence
Trail fence shall be heavy duty two rail white vinyl fence designed for agricultural uses, or an alternative approved by the Engineer. Fence rails shall be nominal 2” x 6” x 16’ ribbed type, with minimum 0.11 inch wall thickness, installed with a minimum 24” bury at 8’ on center. Use aluminum inserts at all end, corner and gate posts (both latch and hinge sides), or fill with concrete. See Plate No. L-15 for details.
Chapter IV. Maintenance
Sec. 504-1 Maintenance
Maintenance of the system is the responsibility of the Developer until such time as the maintenance entity/CSA has collected sufficient funds to operate and maintain the system. Prior to the entity/CSA beginning to maintain the system, the Developer shall replace all plants which are not in healthy condition, readjust all sprinklers and make all repairs to the system.
A one year’s maintenance bond is required prior to acceptance of the landscaping by the maintenance entity.