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HomeMy WebLinkAboutBID - 7511 PORTNER SUBSTATION LANDSCAPING (2)ADDENDUM NO. 2 SPECIFICATIONS AND CONTRACT DOCUMENTS Description of BID 7511: Portner Substation Landscaping OPENING DATE: 3:00 PM (Our Clock) June 19, 2013 To all prospective bidders under the specifications and contract documents described above, the following changes/additions are hereby made and detailed in the following sections of this addendum: 1. Additional Information Exhibit 1 – Revised Section 02950 - Lawns & Grasses Please contact John Stephen, CPPO, LEED AP, Senior Buyer at (970) 221-6777 with any questions regarding this addendum. RECEIPT OF THIS ADDENDUM MUST BE ACKNOWLEDGED BY A WRITTEN STATEMENT ENCLOSED WITH THE BID/QUOTE STATING THAT THIS ADDENDUM HAS BEEN RECEIVED. Financial Services Purchasing Division 215 N. Mason St. 2nd Floor PO Box 580 Fort Collins, CO 80522 970.221.6775 970.221.6707 fcgov.com/purchasing Addendum 2 - 7511 Portner Substation Landscaping Page 1 of 9 LAWNS AND GRASSES 02920 - 1 SECTION 02920 - LAWNS AND GRASSES PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: 1. Sodding. 2. Warranty / Satisfactory Turf / Seed. 3. Maintenance. B. Related Sections: 1. Division 2 Section "Site Clearing" for protection of existing trees and plantings, topsoil stripping and stockpiling and site clearing. 2. Division 2 Section "Irrigation Systems" for sprinkler irrigation. 3. Division 2 Section "Exterior Plants" for border edgings. 1.3 DEFINITIONS A. Finish Grade: Elevation of finished surface of planting soil. B. Planting Soil: Existing or imported topsoil, manufactured topsoil, or surface soil modified to become topsoil; mixed with soil amendments. C. Sub-grade: Surface or elevation of subsoil remaining after completing excavation, or top surface of a fill or backfill immediately beneath planting soil. D. Sub-soil: All soil beneath the topsoil layer of the soil profile, and typified by the lack of organic matter and soil organisms. 1.4 SUBMITTALS A. Product Data: For each type of product indicated. 1. Certification of each seed mixture for turfgrass sod, identifying source, including name and telephone number of supplier. EXHIBIT 1 - REVISED SECTION 02950 - LAWNS & GRASSES Addendum 2 - 7511 Portner Substation Landscaping Page 2 of 9 LAWNS AND GRASSES 02920 - 2 B. Samples for Verification: 1. Soil Analysis: Submit copies of soil test results from Colorado State University Soils Laboratory. Submit copies of cover letter / results with recommendations. 2. Fertilizer: Submit copy of fertilizer composition to be used and the Supplier source. C. Product Certificates: For each type of manufactured product from Manufacturer, and complying with the following: 1. Manufacturer’s certified analysis for standard products. 2. Analysis of other materials by a recognized laboratory made according to methods established by the Association of Official Analytical Chemists, where applicable. D. Material Test Reports: For existing surface topsoil (if available) and/or imported topsoil if required. E. Planting Schedule: Indicating anticipated planting dates for each type of planting. F. Maintenance Instructions: Recommended procedures to be established by Owner for maintenance of turf areas during the warranty period. Submit before Substantial completion. 1.5 QUALITY ASSURANCE A. Installer Qualifications: A qualified landscape installer whose work has resulted in successful lawn establishment. 1. Installer's Field Supervision: Require Installer to maintain an experienced full-time supervisor on Project site when planting is in progress. B. Soil-Testing Laboratory Qualifications: An independent laboratory, recognized by the State Department of Agriculture, with the experience and capability to conduct the testing indicated and that specializes in types of tests to be performed. C. Topsoil Analysis: Furnish soil analysis by a qualified soil-testing laboratory stating percentages of organic matter; gradation of sand, silt, and clay content; cation exchange capacity; sodium absorption ratio; deleterious material; pH; and mineral and plant-nutrient content of topsoil. 1. Report suitability of topsoil for lawn growth. State-recommended quantities of nitrogen, phosphorus, and potash nutrients and soil amendments to be added to produce satisfactory topsoil. 1.6 DELIVERY, STORAGE, AND HANDLING A. Sod: Harvest, deliver, store, and handle sod according to requirements in TPI's "Specifications for Turfgrass Sod Materials" and "Specifications for Turfgrass Sod Transplanting and Installation" in its "Guideline Specifications to Turfgrass Sodding." Deliver sod in time for planting within twenty-four (24) hours of harvesting. Protect sod from breakage and drying. Addendum 2 - 7511 Portner Substation Landscaping Page 3 of 9 LAWNS AND GRASSES 02920 - 3 B. Bulk Materials: 1. Do not dump or store bulk materials near structures, utilities, walkways and pavements, or on existing turf areas or plants. 2. Provide erosion-control measures to prevent erosion or displacement of bulk materials, discharge of soil-bearing water runoff, and airborne dust reaching adjacent properties, water conveyance systems, or walkways. 3. Accompany each delivery of bulk fertilizers and soil amendments with appropriate certificates. 1.7 PROJECT CONDITIONS A. Planting Restrictions: Plant during one of the following periods. Coordinate planting periods with initial maintenance periods to provide required maintenance from date of Substantial Completion. 1. Sod: May – August. B. Weather Limitations: Proceed with planting only when existing and forecasted weather conditions permit. 1.8 MAINTENANCE SERVICE A. Initial Lawn Maintenance Service: Provide full maintenance by skilled employees of landscape Installer. Maintain as required in Part 3. Begin maintenance immediately after each area is planted and continue until acceptable lawn is established, but for not less than the following periods: 1. Sodded Lawns: 1 year from date of Substantial Completion. B. Initial Sod Maintenance Service: Provide full maintenance by skilled employees of landscape Installer. Maintain as required in Part 3. Begin maintenance immediately after each area is planted and continue until acceptable sod is established, but for not less than 40 days from date Substantial Completion PART 2 - PRODUCTS 2.1 TURF GRASS SOD A. Turfgrass Sod: Certified Approved Number 1 Quality/Premium, including limitations on thatch, weeds, diseases, nematodes, and insects, complying with TPI's "Specifications for Turfgrass Sod Materials" in its "Guideline Specifications to Turfgrass Sodding." Furnish viable sod of uniform density, color, and texture, strongly rooted, and capable of vigorous growth and development when planted. Addendum 2 - 7511 Portner Substation Landscaping Page 4 of 9 LAWNS AND GRASSES 02920 - 4 B. Turfgrass Species: Sod of grass species as follows, with not less than ninety-five (95) percent germination, not less than eighty-five (85) percent pure seed, and not more than one-half (1/2) percent weed seed: 1. Legacy Buffalograss Sod from Green Valley Turf Co. (303) 798-6764. 2.2 TOPSOIL A. Planting Soil: Imported topsoil or manufactured topsoil from off-site sources. Obtain topsoil displaced from naturally well-drained construction or mining sites where topsoil occurs at least 4 inches deep; do not obtain from agricultural land, bogs or marshes. 1. Additional Properties of Imported Topsoil or Manufactured Topsoil: Screened and free of stones 1 inch or larger in any dimension; free of roots, plants, sod, clods, clay lumps, pockets of coarse sand, paint, paint washout, concrete slurry, concrete layers or chunks, cement, plaster, building debris, oils, gasoline, diesel fuel, paint thinner, turpentine, tar, roofing compound, acid, and other extraneous materials harmful to plant growth; free of obnoxious weeds and invasive plants including quackgrass, Johnsongrass, poison ivy, nutsedge, nimblewill, Canada thistle, bindweed, bentgrass, wild garlic, ground ivy, perennial sorrel, and bromegrass; not infested with nematodes, grubs, other pests, pest eggs, or other undesirable organisms and disease-causing plant pathogens; friable and with sufficient structure to give good tilth and aeration. Continuous, air-filled, pore- space content on a volume/volume basis shall be at least fifteen (15) percent when moisture is present at field capacity. Soil shall have a field capacity of at least fifteen (15) percent on a dry weight basis. 2. Mix imported topsoil or manufactured topsoil with the following soil amendments in the following quantities to produce planting soil: a. Ratio of Loose Compost to Topsoil by Volume: 1:3 B. Planting Soil: Onsite / Stockpiled topsoil 1. Re-use surface soil stockpiled onsite. Verify suitability of stockpiled soil to produce topsoil. Clean surface soil of roots, plants, sod, stone, clay lumps and other extraneous materials harmful to plant growth. a. Supplement with imported or manufactured topsoil from off-site sources, when quantities are insufficient. See Item A. above. 2.3 ORGANIC SOIL AMENDMENTS A. Organic amendment shall be Class 1 as defined by the Rocky Mountain Region Organics Council. 2.4 FERTILIZER A. Fertilizer for turf shall be commercial type, of uniform composition, free flowing, and conforming to applicable state and federal laws. Addendum 2 - 7511 Portner Substation Landscaping Page 5 of 9 LAWNS AND GRASSES 02920 - 5 B. Fertilizer shall be formulated to meet the recommendations of the Colorado State University soil-testing laboratory for turf fertilization. 2.5 PESTICIDES AND HERBICIDES A. General: Pesticide, registered and approved by EPA, acceptable to authorities having jurisdiction, and of type recommended by manufacturer for each specific problem and as required for Project conditions and application. Do not use restricted pesticides unless authorized in writing by authorities having jurisdiction. B. Pre-Emergent Herbicide (Selective and Non-Selective): Effective for controlling the germination or growth of weeds within planted areas at the soil level directly below the mulch layer. EPA registered and approved, of type recommended by manufacturer for application. C. Post-Emergent Herbicide (Selective and Non-Selective): Effective for controlling weed growth that has already germinated. EPA registered and approved, of type recommended by manufacturer for application. PART 3 - EXECUTION 3.1 EXAMINATION A. Examine areas to receive lawns and grass for compliance with requirements and other conditions affecting performance. B. Proceed with installation only after unsatisfactory conditions have been corrected. 3.2 PREPARATION A. Protect structures, utilities, sidewalks, pavements, and other facilities, trees, shrubs, and plantings from damage caused by planting operations. 1. Protect adjacent and adjoining areas from hydro-seeding and hydro-mulching overspray. 2. Protect grade stakes set by others until directed to remove them. B. Provide erosion-control measures to prevent erosion or displacement of soils and discharge of soil-bearing water runoff or airborne dust to adjacent properties and walkways. 3.3 SOIL AND FINISHED GRADE PREPARATION A. Limit sub-grade preparation to areas to be planted with sod. Verify rough grading provided is within one-tenth of a foot. Verify major drainage channels are completed and in place. Do not start work until the site is acceptable. Once landscape grading has commenced, the landscape contractor shall be responsible for bringing all grading to final line and grade. Addendum 2 - 7511 Portner Substation Landscaping Page 6 of 9 LAWNS AND GRASSES 02920 - 6 B. Stockpiled/New Imported Topsoil: Spread topsoil to a minimum depth of 4” in areas as delineated on the plans. Place topsoil during dry weather and on dry, unfrozen subgrade. Remove vegetable matter and foreign non-organic material from topsoil while spreading. C. Soil Amendment (compost): 1. Sodded Areas: Spread organic amendment at a rate of 3 CY / 1,000 s.f. Do not spread if organic amendment or sub-grade is frozen, muddy, or excessively wet. D. Sub-grades: Loosen sub-grade to a minimum depth of twelve (12) inches overall (8” of existing subgrade and 4” of new topsoil). Remove stones and clods larger than one inch (1”) in any dimension and sticks, roots, rubbish, and other extraneous matter and legally dispose of them off Owner's property. Repeat cultivation in areas where equipment, used for hauling and spreading topsoil, has re-compacted subsoil. E. Finish / Fine Grading: Grade disturbed planting areas to a smooth, uniform surface plane with loose, uniformly fine texture. Grade to within plus or minus one-half (1/2) inch of finish elevation. Roll and rake, remove ridges, and fill depressions to meet finish grades. Limit finish grading to areas that can be planted in the immediate future. 1. Reduce elevation of planting soil to allow for soil thickness of sod. 2. In seeded areas, reduce elevation of finished surface to ½” below the adjacent pavement / curb elevation. F. Moisten prepared lawn areas before planting if soil is dry. Water thoroughly and allow surface to dry before planting. Do not create muddy soil. G. Before planting, restore areas if eroded or otherwise disturbed after finish grading. 3.4 SODDING A. Lay sod within twenty-four (24) hours of harvesting. Do not lay sod if dormant or if ground is frozen or muddy. B. Lay sod to form a solid mass with tightly fitted joints. Butt ends and sides of sod; do not stretch or overlap. Stagger sod strips or pads to offset joints in adjacent courses. Avoid damage to sub- grade or sod during installation. Tamp and roll lightly to ensure contact with subgrade, eliminate air pockets, and form a smooth surface. Work sifted soil or fine sand into minor cracks between pieces of sod; remove excess to avoid smothering sod and adjacent grass. 1. Lay sod across angle of slopes exceeding 1:3. 2. Anchor sod on slopes exceeding 1:3 with wood pegs or steel staples spaced as recommended by sod Supplier but not less than two (2) anchors per sod strip to prevent slippage. C. Saturate sod with fine water spray within two hours of planting. During first week after planting, water daily or more frequently as necessary to maintain moist soil to a minimum depth of 1-1/2 inches below sod. Addendum 2 - 7511 Portner Substation Landscaping Page 7 of 9 LAWNS AND GRASSES 02920 - 7 3.5 TURF RENOVATION A. Renovate existing turf. B. Renovate existing turf damaged by Contractor's operations, such as storage of materials or equipment and movement of vehicles. 1. Re-establish turf where settlement or washouts occur or where minor re-grading is required. 2. Provide new topsoil as required. C. Remove sod and vegetation from diseased or unsatisfactory lawn areas; do not bury in soil. D. Remove topsoil containing foreign materials resulting from Contractor's operations, including oil drippings, fuel spills, stone, gravel, and other construction materials, and replace with new topsoil. E. Mow, dethatch, core aerate, and rake existing turf. F. Remove weeds before seeding. Where weeds are extensive, apply selective herbicides as required. Do not use pre-emergence herbicides. G. Remove waste and foreign materials, including weeds, soil cores, grass, vegetation, and turf, and legally dispose of them off Owner's property. H. Till stripped, bare, and compacted areas thoroughly to a soil depth of 6 inches. I. Apply soil amendments and initial fertilizers required for establishing new lawns and mix thoroughly into top four (4) inches of existing soil. Provide new planting soil to fill low spots and meet finish grades. J. Water newly planted areas and keep moist until new lawn is established. 3.6 TURF MAINTENANCE A. Maintain and establish lawn by watering, fertilizing, weeding, mowing, trimming, replanting, and other operations. Roll, re-grade, and re-plant bare or eroded areas and re-mulch to produce a uniformly smooth lawn. Provide materials and installation the same as those used in the original installation. 1. Fill in as necessary soil subsidence that may occur because of settling or other processes. Replace materials and turf damaged or lost in areas of subsidence. 2. In areas where mulch has been disturbed by wind or maintenance operations, add new mulch and anchor as required to prevent displacement. 3. Apply treatments as required to keep turf and soil free of pests and pathogens or disease. Use integrated pest management practices whenever possible to minimize the use of pesticides and reduce hazards. B. Watering: Provide and maintain temporary piping, hoses, and lawn-watering equipment to convey water from sources and to keep lawn uniformly moist to a depth of four (4) inches. Addendum 2 - 7511 Portner Substation Landscaping Page 8 of 9 LAWNS AND GRASSES 02920 - 8 1. Schedule watering to prevent wilting, puddling, erosion, and displacement of seed or mulch. Lay out temporary watering system to avoid walking over muddy or newly planted areas. 2. Water turf with fine spray at a minimum rate of one (1) inch per week unless rainfall precipitation is adequate. C. Turf Post-fertilization: Apply fertilizer after initial mowing and when grass is dry. 1. Use fertilizer that will provide actual nitrogen of at least 1 lb/1000 sq. ft. to lawn area. 3.7 WARRANTY / SATISFACTORY TURF A. Lawn installations shall meet the following criteria as determined by Owner’s Representative: 1. Satisfactory Seeded Turf: At end of warranty period, a healthy, uniform, close stand of grass has been established, free of weeds and surface irregularities, with coverage exceeding 90 percent over any 10 sq. ft. and bare spots not exceeding 5 by 5 inches. 2. Satisfactory Sodded Turf: At end of maintenance period, a healthy, well-rooted, even- colored, viable lawn has been established, free of weeds, open joints, bare areas, and surface irregularities. 3.8 PESTICIDE APPLICATION A. Apply pesticides and other chemical products and biological control agents in accordance with requirements of authorities having jurisdiction and manufacturer's written recommendations. Coordinate applications with Owner's operations and others in proximity to the Work. Notify Owner before each application is performed. B. Post-Emergent Herbicides (Selective and Non-Selective): Apply only as necessary to treat already-germinated weeds and in accordance with manufacturer's written recommendations. 3.9 CLEANUP AND PROTECTION A. Promptly remove soil and debris, created by lawn work, from paved areas. Clean wheels of vehicles before leaving site to avoid tracking soil onto roads, walks, or other paved areas. B. Erect temporary fencing or barricades and warning signs as required to protect newly planted areas from traffic. Maintain fencing and barricades throughout initial maintenance period and remove after lawn is established. C. Remove non-degradable erosion-control measures after grass establishment period. END OF SECTION 02920 Addendum 2 - 7511 Portner Substation Landscaping Page 9 of 9