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HomeMy WebLinkAbout32-92-50-Soil-Preparation-For-Rain-Gardens_Rev_1Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 92 50 SOIL PREPARATION FOR RAIN GARDENS 1 of 7 Section 32 92 50 SOIL PREPARATION FOR RAIN GARDENS PART 1 - GENERAL 1.1 SUMMARY A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 01 Specification sections, apply to work of this section. B. Related Sections: The following Sections contain requirements that relate to this Section: 1. Section 31 00 00 – Earth Moving 2. Section 32 92 40 – Seeding for Non-Lawn Areas 3. Section 32 93 10 – Trees, Shrubs and Groundcovers 1.2 DESCRIPTION OF WORK A. Provide all materials, equipment and labor necessary to complete the work as indicated on the drawings, or as specified herein. B. The principal work of this section includes, but may not be limited to, the following: 1. Loam from off-site, if on-site is insufficient 2. Loam Testing 3. Mixing of Sand, Loam and Compost 4. Grading and Spreading of Soil Mix 1.3 QUALITY ASSURANCE A. Contractor shall specialize in work outlined with a minimum of five (5) years of experience on similar projects. B. Contractor shall not make substitutions without written approval. If specified materials are not available, obtain approval for substitution from the Owner's Representative. C. Pre-Construction Meeting – Contractor shall request in writing an on-site meeting with the Owner’s Representative, the General Contractor and Site Contractor and the Landscape Architect and the Civil Engineer to review the scope of work prior to any work taking place to review the subgrade conditions. Any deficiencies in the subgrade conditions shall be remedied by the contractor and approved by the Owner prior to any loam being spread. D. All fertilizer applications shall be performed by a licensed applicator in strict conformance with all local, state and federal regulations. Notify the Owner’s Project Representative at least two weeks prior to scheduled application. A copy of the applicator’s license shall be given to the Owner’s Representative. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 92 50 SOIL PREPARATION FOR RAIN GARDENS 2 of 7 E. Any loam stockpiles sitting beyond one growing season shall be covered. Contractor shall be responsible for complete removal and disposal of any weed seed established on loam stockpiles prior to placement and spreading of loam. F. The materials shall not be handled or moved when in wet or frozen conditions. G. Imported loam shall meet LEED Criteria as follows: Imported topsoils or soil blends designed to serve as topsoil may not include the following: 1. Soils defined regionally by the Natural Resources Conservation Service web soil survey (or local equivalent for projects outside the U.S.) as prime farmland, unique farmland, or farmland of statewide or local importance; or 2. Soils from other greenfield sites, unless those soils are a byproduct of a construction process. 1.4 SUBMITTALS A. Samples shall be as follows: 1. The Contractor shall provide a one cubic foot representative sample per each 1,000 cubic yard on-site stockpile of existing loam for testing. All stockpile sampling shall be per ASTM D 75 and Appendices. 2. Preparation of Samples: Contractor shall place these soil slices into a large, clean plastic container and mix thoroughly. Contractor shall take one cup of soil mixture and dry it room temperature (do not dry samples in an oven or on a stove or radiator). Once soil is dry, place soil in sandwich size type plastic bag and close. Label each sample on outside of bag, identifying sample by soil type and stockpile location and phase of construction. 3. Loam from off-site, if on-site loam is insufficient: The Contractor shall provide a one cubic foot representative sample per each 1,000 cubic yard proposed stockpile of loam borrow for testing. All stockpile sampling shall be per ASTM D 75 and Appendices. B. Contractor shall submit to the Owner’s Representative samples, manufacturer’s product data, source of off-site loam and certified testing of off-site loam at least 60 days prior to delivering material on site. C. Contractor shall submit to the Owner’s Representative samples and certified test results for on-site loam 60 days prior to using material to allow for reformulation and retesting if test results are rejected. D. Contractor shall submit to the Owner’s Representative certified test results for loam with added amendments 60 days prior to using material to allow for reformulation and retesting if test results are rejected. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 92 50 SOIL PREPARATION FOR RAIN GARDENS 3 of 7 E. Testing: Testing shall be as follows: 1. General a. On-site stockpiled loam shall be tested at the beginning of each phase of construction prior to its use in its respective phase. b. Contractor shall provide current certified test results for off-site, imported loam to be used on the project prior to use. Testing date shall be within the current year the loam is to be used on the project. c. Contractor shall provide current certified test results of all soil amendments including organic compost and soil additives prior to use. Testing date shall be within the current year the loam is to be used on the project. d. All testing and re-testing shall be at the expense of the Contractor. Contractor shall deliver samples to an independent testing facility such as the University of Mass Experiment Station and have the results forwarded to the Owner’s Representative for review and approval prior to using the material. e. Samples for tests shall be taken from on-site stockpiles in the presence of the Owner’s Representative. 2. Testing reports shall include the following tests and recommendations: a. Percent organic matter by weight as determined by the loss on ignition of samples that have been oven dried to a constant weight at temperature of 105 degrees C. b. Mechanical gradation (sieve analysis) shall be performed and compared to the USDA Soil Classification System. c. Chemical Analysis shall be undertaken for Nitrate Nitrogen, Ammonium Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Lead, Zinc, Soluble Salts, extractable Aluminum, Cadmium, Copper, pH and buffer pH, carbon:nitrogen ratio and toxic elements. Except where otherwise noted, nutrient tests shall be for available nutrients. d. Soil analysis tests shall show recommendations for soil additives to correct soils to meet the specifications and for additives necessary to accomplish lawn and planting work as specified. e. Certified analysis, manufacturer, labels and source of organic compost and soil additives shall be submitted. 1.2 DEFINITIONS A. The following definitions shall apply to the work of this section. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 92 50 SOIL PREPARATION FOR RAIN GARDENS 4 of 7 The following size distributions of mineral particles by diameter and sieve size shall apply to the following conventional names of soil types: Conventional Name Retained on US Sieve No. Diameter (mm) Very Coarse Sand #18 1-2 Coarse Sand #35 0.5-1 Medium Sand #60 0.25-0.5 Fine Sand #140 0.10-0.25 Very Fine Sand #270 0.05-0.10 Silt by hydrometer 0.002-0.05 Clay by hydrometer Less than 0.002 1.6 PRODUCT DELIVER, STORAGE AND HANDLING A. Protect all products from weather vandalism or other damaging or deteriorating conditions. PART 2 - PRODUCTS 2.1 CLEAN SCREENED LOAM A. Loam shall consist of screened fertile, loose, friable fine sandy loam or sandy loam free of subsoil, refuse, stamps, roots, rocks, cobbles, stones, brush, noxious weeds, litter and other materials which are larger than one inch (1”) in any dimension and which will prevent healthy plant growth. B. Loam shall be one of the following sandy loams: “coarse sandy loam”, “sandy loam”, “fine sandy loam” based on the USDA Classification System determined by mechanical analysis ASTM D-422. It shall be uniform in composition, without admixture of subsoil. The loam shall possess good filtration and permeability rates, and shall possess a mechanical analysis where: Percent Passing By Weight Millimeter US Sieve Size Max. Min. 2 #10 --- 100 1 #18 100 80 0.5 #35 87 67 0.25 #60 78 48 0.10 #140 68 30 0.05 #270 55 22 0.02 #400 7 2 1. One hundred percent shall pass a 1/2 inch sieve opening, and the maximum retained on the quarter inch sieve shall be 20 percent by weight of the total sample. 2. On-site and off-site loam shall be screened to achieve the above specified sieve analysis. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 92 50 SOIL PREPARATION FOR RAIN GARDENS 5 of 7 3. Organic matter in approved planting soil shall be between 3% minimum and 5% maximum by weight as determined by the loss on ignition of samples that have been oven dried to a constant weight at temperature of 105 degrees C. 4. Acidity range of planting soil shall be 5.5 to 6.5 pH when tested according to methods of testing or A.O.A.C. a. When pH of loam borrow is equal to or greater than the maximum use aluminum sulfate to adjust pH to required levels. b. When pH of loam borrow is less than the minimum required use either sulfur or ferrous sulfate to adjust pH to required levels. C. Soluble salt content shall be less than 100 PPM. D. Loam shall be uncontaminated by salt water, foreign matter and substances harmful to plant growth. Topsoil shall not have extractable aluminum greater than 200 parts per million unless otherwise noted. Cation Exchange Capacity (CEC) shall be between 10 and 15. 2.2 ORGANIC COMPOST A. Organic Compost shall be natural or manufactured mature, composted organic material produced from a DEP-approved composting vendor. Only Federal EPA Class A or Massachusetts Type I compost products shall be used. Sewage Sludge (Biosolids) shall not be used. The following shall be requirements shall be met: 1. Compost shall originate from aged organic materials, free from sticks, stones and/or other substances which would be injurious to health plant growth. 2. Test results shall indicate maturity and age of organic compost. Raw uncomposted or unprocessed or incompletely composted organic matter shall be rejected. 3. Compost shall contain no uncomposted bulking agents such as uncomposted wood chips and shall be free from hard lumps and free from seeping water when handled. 4. Compost shall be free from sticks, stones, plastic, debris or other substances which would be injurious to healthy plant growth. 100% of compost material shall pass a ½” sieve. 5. Acidity range shall be pH 6 minimum and 8 maximum when tested according to methods of testing or A.O.A.C. 6. Organic matter shall not be less than 30% as determined by ASTM D2974. 7. Moisture content of 35% to 70%, as determined by ASTM D2974 8. Carbon:Nitrogen ratio of 15:1 to 30:1 9. Solvita intex of 6 to 8 10. Non-phytotoxic 11. There shall be no unpleasant or detectable odor of ammonia or hydrogen sulfide, which would indicate immature compost. Color of compost shall be dark brown. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 92 50 SOIL PREPARATION FOR RAIN GARDENS 6 of 7 2.3 SAND A. Sand shall be a gravelly sand meeting ASTM D 422. B. Sieve size Percent passing 2” 100% ¾” 100% ¼” 50-80% No. 40 15-40% No. 200 0-3% PART 3 - EXECUTION 3.1 MIXING OF LOAM, SAND AND COMPOST A. Thoroughly mix the Loam, Sand and Compost at the following percentages for Raingardens): 40% Sand 20-30% Loam 30-40% Compost Percentages are by volume B. The Loam/Compost mix shall be fully and thoroughly blended. 3.2 GRADING AND SPREADING OF SOIL MIX A. Prior to any spreading of loam, it is the responsibility of the Contractor to request a meeting with the Owner’s Representative and the Landscape Architect to review and approve the subgrade condition. Subgrade shall meet the requirements outlined in Section 31 00 00 – Earth Moving and the following. B. Remove all debris and other inorganic materials on any prepared subgrades, and reshape and dress any damaged or eroded slopes, swales, and other areas. Scarify and loosen subgrade to a friable condition in any areas where compaction may have occurred. Fill all depressions in existing grades with suitable fill material as specified in Section 31 00 00-Earth Moving prior to spreading loam, then shape and finish grade to depth of loam required. Loam shall not be placed until subgrade is in suitable condition and free of excessive moisture or frozen materials. 1. Landscape Architect shall review compaction testing of subgrades in all landscape areas. The degree of compaction for subgrade in landscape areas shall be 90%. C. Loam/Compost shall not be placed until subgrade is in suitable condition and free of excessive moisture or frozen materials. D. Planting mixes for raingarden areas shall be spread to produce a total depth of 12" or as otherwise shown on the plan. Fill all depressions in existing grades with suitable fill material as specified in Section 31 00 00 prior to spreading of Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 92 50 SOIL PREPARATION FOR RAIN GARDENS 7 of 7 loam/compost mix, then shape and finish grade to depth required. E. Any debris that falls on paved or other hardscape areas shall be removed by the Contractor. END OF SECTION 32 92 50 (THIS PAGE IS BLANK)