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HomeMy WebLinkAboutFile Documents.427 Rio Grande Pl.0016.2019 (16).ACBKAspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 1 SECTION 329113 - SOIL PREPARATION PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section includes planting soils[ and layered soil assemblies] specified by composition of the mixes. B. Related Requirements: 1. Section 323300 "Site Furnishings" for placing planting soil in exterior unit planters. 2. Section 329200 "Turf and Grasses" for placing planting soil for turf and grasses. 3. Section 329300 "Plants" for placing planting soil for plantings. 4. Section 329600 "Transplanting" for placing planting soil in tree planting pits. 1.3 ALLOWANCES A. [Preconstruction] [and] [field quality-control] testing [is] [are] part of testing and inspecting allowance. 1.4 UNIT PRICES A. Work of this Section is affected by [unit prices specified in Section 012200 "Unit Prices."] <Insert name of unit price.> 1.5 DEFINITIONS A. AAPFCO: Association of American Plant Food Control Officials. B. Backfill: The earth used to replace or the act of replacing earth in an excavation. This can be amended or unamended soil as indicated. C. CEC: Cation exchange capacity. D. Compost: The product resulting from the controlled biological decomposition of organic material that has been sanitized through the generation of heat and stabilized to the point that it is beneficial to plant growth. E. Duff Layer: A surface layer of soil, typical of forested areas, that is composed of mostly decayed leaves, twigs, and detritus. 06/24/2019 While this draft specification document may be thorough, it has little relevance to the WELS review. The provisions set forth in WELS Sections 4.1 and 4.2 are the Standards by which the project must abide. This document will not be considered part of the WELS review or approval. WELS 3.1.5 requires the Soil Criteria (Sections 4.1 and 4.2) to be on the landscape design plan. Please comply with this requirement. Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 2 F. Imported Soil: Soil that is transported to Project site for use. G. Layered Soil Assembly: A designed series of planting soils, layered on each other, that together produce an environment for plant growth. H. Manufactured Soil: Soil produced by blending soils, sand, stabilized organic soil amendments, and other materials to produce planting soil. I. NAPT: North American Proficiency Testing Program. An SSSA program to assist soil-, plant-, and water-testing laboratories through interlaboratory sample exchanges and statistical evaluation of analytical data. J. Organic Matter: The total of organic materials in soil exclusive of undecayed plant and animal tissues, their partial decomposition products, and the soil biomass; also called "humus" or "soil organic matter." K. Planting Soil: Existing, on-site soil; imported soil; or manufactured soil that has been modified as specified with soil amendments and perhaps fertilizers to produce a soil mixture best for plant growth. L. RCRA Metals: Hazardous metals identified by the EPA under the Resource Conservation and Recovery Act. M. SSSA: Soil Science Society of America. N. Subgrade: Surface or elevation of subsoil remaining after excavation is complete, or the top surface of a fill or backfill before planting soil is placed. O. Subsoil: Soil beneath the level of subgrade; soil beneath the topsoil layers of a naturally occurring soil profile, typified by less than 1 percent organic matter and few soil organisms. P. Surface Soil: Soil that is present at the top layer of the existing soil profile. In undisturbed areas, surface soil is typically called "topsoil"; but in disturbed areas such as urban environments, the surface soil can be subsoil. Q. USCC: U.S. Composting Council. 1.6 PREINSTALLATION MEETINGS A. Preinstallation Conference: Conduct conference at [Project site] <Insert location>. 1.7 ACTION SUBMITTALS A. Product Data: For each type of product. 1. Include recommendations for application and use. 2. Include test data substantiating that products comply with requirements. 3. Include sieve analyses for aggregate materials. 4. Material Certificates: For each type of [imported soil] [and] [soil amendment and fertilizer] <Insert item> before delivery to the site, according to the following: 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 3 a. Manufacturer's qualified testing agency's certified analysis of standard products. b. Analysis of fertilizers, by a qualified testing agency, made according to AAPFCO methods for testing and labeling and according to AAPFCO's SUIP #25. c. Analysis of nonstandard materials, by a qualified testing agency, made according to SSSA methods, where applicable. B. Sustainable Design Submittals: 1. <Double click to insert sustainable design text for regional materials.> C. Samples: For each bulk-supplied material, [1-quart] [1-gal.] <Insert value> volume of each in sealed containers labeled with content, source, and date obtained. Each Sample shall be typical of the lot of material to be furnished; provide an accurate representation of composition, color, and texture. 1.8 INFORMATIONAL SUBMITTALS A. Qualification Data: For each testing agency. B. Preconstruction Test Reports: For preconstruction soil analyses specified in "Preconstruction Testing" Article. C. Field quality-control reports. 1.9 QUALITY ASSURANCE A. Testing Agency Qualifications: An independent, state-operated, or university-operated laboratory; experienced in soil science, soil testing, and plant nutrition; with the experience and capability to conduct the testing indicated; and that specializes in types of tests to be performed. 1. Laboratories: Subject to compliance with requirements, [provide testing by the following] [provide testing by one of the following]: a. <Insert laboratory's name and address>. 2. Multiple Laboratories: At Contractor's option, work may be divided among qualified testing laboratories specializing in physical testing, chemical testing, and fertility testing. 1.10 PRECONSTRUCTION TESTING A. Preconstruction Testing Service: [Owner will engage] [Engage] a qualified testing agency to perform preconstruction soil analyses on [existing, on-site soil] [imported soil] <Insert item>. 1. Notify Architect [seven] <Insert number> days in advance of the dates and times when laboratory samples will be taken. B. Preconstruction Soil Analyses: For each unamended soil type, perform testing on soil samples and furnish soil analysis and a written report containing soil-amendment and fertilizer 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 4 recommendations by a qualified testing agency performing the testing according to "Soil- Sampling Requirements" and "Testing Requirements" articles. 1. Have testing agency identify and label samples and test reports according to sample collection and labeling requirements. 1.11 SOIL-SAMPLING REQUIREMENTS A. General: Extract soil samples according to requirements in this article. B. Sample Collection and Labeling: Have samples taken and labeled by [Owner] [Contractor in presence of Architect] [soil scientist (CPSS) certified by SSSA] [soil classifier (CPSC) certified by SSSA] [soil scientist (RPSS) registered by the National Society of Consulting Soil Scientists] [or] [state-certified, -licensed, or -registered soil scientist] <Insert requirement> under the direction of the testing agency. 1. Number and Location of Samples: Minimum of [three] [eight] <Insert number> representative soil samples [from varied locations] [where indicated on Drawings] [where directed by Architect] <Insert requirement> for each soil to be used or amended for landscaping purposes. 2. Procedures and Depth of Samples: [According to USDA-NRCS's "Field Book for Describing and Sampling Soils."] [As directed by Architect.] <Insert requirement.> 3. Division of Samples: Split each sample into two, equal parts. Send half to the testing agency and half to Owner for its records. 4. Labeling: Label each sample with the date, location keyed to a site plan or other location system, visible soil condition, and sampling depth. 1.12 TESTING REQUIREMENTS A. General: Perform tests on soil samples according to requirements in this article. B. Physical Testing: 1. Soil Texture: Soil-particle, size-distribution analysis by[ one of] the following methods according to SSSA's "Methods of Soil Analysis - Part 1-Physical and Mineralogical Methods": a. Sieving Method: Report sand-gradation percentages for very coarse, coarse, medium, fine, and very fine sand; and fragment-gradation (gravel) percentages for fine, medium, and coarse fragments; according to USDA sand and fragment sizes. b. Hydrometer Method: Report percentages of sand, silt, and clay. 2. Total Porosity: Calculate using particle density and bulk density according to SSSA's "Methods of Soil Analysis - Part 1-Physical and Mineralogical Methods." 3. Water Retention: According to SSSA's "Methods of Soil Analysis - Part 1-Physical and Mineralogical Methods." 4. Saturated Hydraulic Conductivity: According to SSSA's "Methods of Soil Analysis - Part 1-Physical and Mineralogical Methods"; at 85% compaction according to ASTM D 698 (Standard Proctor). 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 5 C. Chemical Testing: 1. CEC: Analysis by sodium saturation at pH 7 according to SSSA's "Methods of Soil Analysis - Part 3- Chemical Methods." 2. Clay Mineralogy: Analysis and estimated percentage of expandable clay minerals using CEC by ammonium saturation at pH 7 according to SSSA's "Methods of Soil Analysis - Part 1- Physical and Mineralogical Methods." 3. Metals Hazardous to Human Health: Test for presence and quantities of RCRA metals including aluminum, arsenic, barium, copper, cadmium, chromium, cobalt, lead, lithium, and vanadium. If RCRA metals are present, include recommendations for corrective action. 4. Phytotoxicity: Test for plant-available concentrations of phytotoxic minerals including aluminum, arsenic, barium, cadmium, chlorides, chromium, cobalt, copper, lead, lithium, mercury, nickel, selenium, silver, sodium, strontium, tin, titanium, vanadium, and zinc. D. Fertility Testing: Soil-fertility analysis according to standard laboratory protocol of [SSSA NAPT NCR-13] [SSSA NAPT NEC-67] [SSSA NAPT SERA-6] [SSSA NAPT WERA-103], including the following: 1. Percentage of organic matter. 2. CEC, calcium percent of CEC, and magnesium percent of CEC. 3. Soil reaction (acidity/alkalinity pH value). 4. Buffered acidity or alkalinity. 5. Nitrogen ppm. 6. Phosphorous ppm. 7. Potassium ppm. 8. Manganese ppm. 9. Manganese-availability ppm. 10. Zinc ppm. 11. Zinc availability ppm. 12. Copper ppm. 13. Sodium ppm[ and sodium absorption ratio]. 14. Soluble-salts ppm. 15. Presence and quantities of problem materials including salts and metals cited in the Standard protocol. If such problem materials are present, provide additional recommendations for corrective action. 16. Other deleterious materials, including their characteristics and content of each. E. Organic-Matter Content: Analysis using loss-by-ignition method according to SSSA's "Methods of Soil Analysis - Part 3- Chemical Methods." F. Recommendations: Based on the test results, state recommendations for soil treatments and soil amendments to be incorporated to produce satisfactory planting soil suitable for healthy, viable plants indicated. Include, at a minimum, recommendations for nitrogen, phosphorous, and potassium fertilization, and for micronutrients. 1. Fertilizers and Soil Amendment Rates: State recommendations in weight [per 1000 sq. ft. for 6-inchdepth of soil] <Insert requirement>. 2. Soil Reaction: State the recommended liming rates for raising pH or sulfur for lowering pH according to the buffered acidity or buffered alkalinity in weight [per 1000 sq. ft. for 6-inchdepth of soil] <Insert requirement>. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 6 1.13 DELIVERY, STORAGE, AND HANDLING A. Packaged Materials: Deliver packaged materials in original, unopened containers showing weight, certified analysis, name and address of manufacturer, and compliance with state and Federal laws if applicable. 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. Do not move or handle materials when they are wet or frozen. 4. Accompany each delivery of bulk fertilizers and soil amendments with appropriate certificates. PART 2 - PRODUCTS 2.1 MATERIALS A. <Double click to insert sustainable design text for regional materials.> 2.2 PLANTING SOILS SPECIFIED BY COMPOSITION A. General: Soil amendments, fertilizers, and rates of application specified in this article are guidelines that may need revision based on testing laboratory's recommendations after preconstruction soil analyses are performed. B. Planting-Soil Type 1 – Non-roof: Existing, on-site surface soil, with the duff layer, if any, retained[; and stockpiled on-site]; modified to produce viable planting soil. Blend existing, on- site surface soil with the following soil amendments and fertilizers in the following quantities to produce planting soil: 1. Sources: Take imported, unamended soil from sources that are naturally well-drained sites where topsoil occurs at least 4 inches deep, not from [agricultural land, ]bogs, or marshes; and that do not contain undesirable organisms; disease-causing plant pathogens; or obnoxious weeds and invasive plants including, but not limited to, quackgrass, Johnsongrass, poison ivy, nutsedge, nimblewill, Canada thistle, bindweed, bentgrass, wild garlic, ground ivy, perennial sorrel, and bromegrass. 2. Additional Properties of Imported Soil before Amending: Soil reaction of pH 6 to 7 and minimum of 5 percent organic-matter content by volume, friable, and with sufficient structure to give good tilth and aeration. a. Percentage of Organic Matter for Top Soil: 5 percent by volume. b. Percentage of Organic Matter for Subsoil: 5 percent by volume. 3. Unacceptable Properties: Manufactured soil shall not contain the following: 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 7 a. Unacceptable Materials: 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 that are harmful to plant growth. b. Unsuitable Materials: Stones, roots, plants, sod, clay lumps, and pockets of coarse sand that exceed a combined maximum of [8] <Insert number> percent by dry weight of the imported soil. c. Large Materials: Stones, clods, roots, clay lumps, and pockets of coarse sand exceeding [2 inches] [3 inches] <Insert dimension> in any dimension. 4. Amended Soil Composition: Blend imported, unamended soils with the following soil amendments and fertilizers in the following quantities to produce planting soil: a. Ratio of Loose Compost to Soil: [1:4] [1:3] [1:2] <Insert ratio> by volume. b. Ratio of Loose [Sphagnum] [Muck] Peat to Soil: <Insert ratio> by volume. c. Ratio of Loose Wood Derivatives Soil: <Insert ratio> by volume. d. Volume of Sand: <insert amount>% e. Volume of Perlite: <Insert volume> per [cu. yd.] <Insert value>. f. Weight of Lime: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. g. Weight of [Sulfur] [Iron Sulfate]: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. h. Weight of Agricultural Gypsum: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. i. Weight of Superphosphate: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. j. Weight of Commercial Fertilizer: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. k. Weight of Slow-Release Fertilizer: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. 5. Soil data: a. Percentage of Organic Matter: 9 to 18 percent by volume. b. Soil Reaction: pH of 6 to 7 c. CEC of Total Soil: Minimum 10 meq/100 mL d. Soluble-Salt Content: 5 to 10 dS/m measured by electrical conductivity. e. Bulk Density: 1.1 g/cu. cm to 1.4 g/cu. cm at 85% compaction. f. Total Porosity: Minimum 50 percent at 85% compaction. g. Fertility: Per laboratory recommendation h. Microbiological Content: per laboratory recommendation i. RCRA Metals: Below maximum limits established by the EPA per section 31 23 23 j. Soil Texture: Sandy loam k. Minimum Soil Depth: 36 inches. l. Minimum Top Soil Depth: 12 inches C. Planting-Soil Type 2 – Roof: Imported, naturally formed soil from off-site sources and consisting of sandy loam soil according to USDA textures; and modified to produce viable planting soil. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 8 1. Sources: Take imported, unamended soil from sources that are naturally well-drained sites where topsoil occurs at least 4 inches deep, not from [agricultural land, ]bogs, or marshes; and that do not contain undesirable organisms; disease-causing plant pathogens; or obnoxious weeds and invasive plants including, but not limited to, quackgrass, Johnsongrass, poison ivy, nutsedge, nimblewill, Canada thistle, bindweed, bentgrass, wild garlic, ground ivy, perennial sorrel, and bromegrass. 2. Additional Properties of Imported Soil before Amending: Soil reaction of pH 6 to 7 and minimum of 5 percent organic-matter content by volume, friable, and with sufficient structure to give good tilth and aeration. a. Percentage of Organic Matter for Top Soil: 5 percent by volume. b. Percentage of Organic Matter for Subsoil: 5 percent by volume. 3. Unacceptable Properties: Manufactured soil shall not contain the following : a. Unacceptable Materials: 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 that are harmful to plant growth. b. Unsuitable Materials: Stones, roots, plants, sod, clay lumps, and pockets of coarse sand that exceed a combined maximum of [8] <Insert number> percent by dry weight of the imported soil. c. Large Materials: Stones, clods, roots, clay lumps, and pockets of coarse sand exceeding [2 inches] [3 inches] <Insert dimension> in any dimension. 4. Amended Soil Composition: Blend imported, unamended soil with the following soil amendments and fertilizers in the following quantities to produce planting soil: a. Ratio of Loose Compost to Soil: [1:4] [1:3] [1:2] <Insert ratio> by volume. b. Ratio of Loose [Sphagnum] [Muck] Peat to Soil: <Insert ratio> by volume. c. Ratio of Loose Wood Derivatives Soil: <Insert ratio> by volume. d. Volume of Sand: <insert amount>% e. Volume of Perlite: <Insert volume> per [cu. yd.] <Insert value>. f. Weight of Lime: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. g. Weight of [Sulfur] [Iron Sulfate]: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. h. Weight of Agricultural Gypsum: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. i. Weight of Superphosphate: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. j. Weight of Commercial Fertilizer: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. k. Weight of Slow-Release Fertilizer: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. 5. Soil data for roof soil without trees: a. Back fill trees with 50% native topsoil. b. Soil Reaction: pH of 6 to 7 c. CEC of Total Soil: Minimum 10 meq/100 mL 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 9 d. Soluble-Salt Content: 5 to 10 dS/m measured by electrical conductivity. e. Bulk Density: 1.1 g/cu. cm to 1.4 g/cu. cm at 85% compaction. f. Total Porosity: Minimum 50 percent at 85% compaction. g. Fertility: Per laboratory recommendation h. Microbiological Content: per laboratory recommendation i. RCRA Metals: Below maximum limits established by the EPA per section 31 23 23 j. Minimum Total Soil Depth: 15 inches k. Minimum Top Soil Depth: 6 inches 6. Soil data for roof soil with trees: a. Back fill trees with 50% native topsoil. b. Soil Reaction: pH of 6 to 7 c. CEC of Total Soil: Minimum 10 meq/100 mL d. Soluble-Salt Content: 5 to 10 dS/m measured by electrical conductivity. e. Bulk Density: 1.1 g/cu. cm to 1.4 g/cu. cm at 85% compaction. f. Total Porosity: Minimum 50 percent at 85% compaction. g. Fertility: Per laboratory recommendation h. Microbiological Content: per laboratory recommendation i. RCRA Metals: Below maximum limits established by the EPA per section 31 23 23 j. Minimum Total Soil Depth: 36 inches k. Minimum Top Soil Depth: 6 inches D. Planting-Soil Type 3 – Bioretention: Manufactured soil consisting of manufacturer's basic sandy loam blended in a manufacturing facility with sand, stabilized organic soil amendments, and other materials to produce viable planting soil. 1. Sources: Take imported, unamended soil from sources that are naturally well-drained sites where topsoil occurs at least 4 inches deep, not from [agricultural land, ]bogs, or marshes; and that do not contain undesirable organisms; disease-causing plant pathogens; or obnoxious weeds and invasive plants including, but not limited to, quackgrass, Johnsongrass, poison ivy, nutsedge, nimblewill, Canada thistle, bindweed, bentgrass, wild garlic, ground ivy, perennial sorrel, and bromegrass. 2. Additional Properties of Imported Soil before Amending: Soil reaction of pH 6 to 7 and minimum of 5 percent organic-matter content by volume, friable, and with sufficient structure to give good tilth and aeration. a. Percentage of Organic Matter for Top Soil: 5 percent by volume. b. Percentage of Organic Matter for Subsoil: 5 percent by volume. 3. Unacceptable Properties: Manufactured soil shall not contain the following: a. Unacceptable Materials: 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 that are harmful to plant growth. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 10 b. Unsuitable Materials: Stones, roots, plants, sod, clay lumps, and pockets of coarse sand that exceed a combined maximum of [8] <Insert number> percent by dry weight of the imported soil. c. Large Materials: Stones, clods, roots, clay lumps, and pockets of coarse sand exceeding [2 inches] [3 inches] <Insert dimension> in any dimension. 4. Amended Soil Composition: Blend imported, unamended soils with the following soil amendments and fertilizers in the following quantities to produce planting soil: a. Ratio of Loose Compost to Soil: [1:4] [1:3] [1:2] <Insert ratio> by volume. b. Ratio of Loose [Sphagnum] [Muck] Peat to Soil: <Insert ratio> by volume. c. Ratio of Loose Wood Derivatives Soil: <Insert ratio> by volume. d. Volume of Sand: 70% e. Volume of Perlite: <Insert volume> per [cu. yd.] <Insert value>. f. Weight of Lime: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. g. Weight of [Sulfur] [Iron Sulfate]: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. h. Weight of Agricultural Gypsum: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. i. Weight of Superphosphate: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. j. Weight of Commercial Fertilizer: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. k. Weight of Slow-Release Fertilizer: <Insert weight> per [1000 sq. ft.] <Insert area> per [6 inches] <Insert dimension> of soil depth. 5. Soil data for bioretention areas without trees: a. Percentage of Organic Matter: 9 to 18 percent by volume. b. Soil Reaction: pH of 6 to 7 c. CEC of Total Soil: Minimum 10 meq/100 mL d. Soluble-Salt Content: 5 to 10 dS/m measured by electrical conductivity. e. Bulk Density: 1.1 g/cu. cm to 1.4 g/cu. cm at 85% compaction. f. Total Porosity: Minimum 50 percent at 85% compaction. g. Fertility: Per laboratory recommendation h. Microbiological Content: per laboratory recommendation i. RCRA Metals: Below maximum limits established by the EPA per section 31 23 23 j. Soil Texture: Sandy loam k. Minimum Soil Depth: 18 inches. l. Minimum Top Soil Depth: 6 inches. 6. Soil data for bioretention areas with trees: a. Percentage of Organic Matter: 9 to 18 percent by volume. b. Soil Reaction: pH of 6 to 7 c. CEC of Total Soil: Minimum 10 meq/100 mL d. Soluble-Salt Content: 5 to 10 dS/m measured by electrical conductivity. e. Bulk Density: 1.1 g/cu. cm to 1.4 g/cu. cm at 85% compaction. f. Total Porosity: Minimum 50 percent at 85% compaction. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 11 g. Fertility: Per laboratory recommendation h. Microbiological Content: per laboratory recommendation i. RCRA Metals: Below maximum limits established by the EPA per section 31 23 23 j. Soil Texture: Sandy loam k. Minimum Soil Depth: 36 inches. l. Minimum Top Soil Depth: 6 inches. 2.3 ORGANIC SOIL AMENDMENTS A. Compost: Well-composted, stable, and weed-free organic matter produced by composting feedstock, and bearing USCC's "Seal of Testing Assurance," and as follows: 1. Feedstock: [Limited to leaves] [May include sewage sludge] [May include animal waste] <Insert requirement>. 2. Reaction: [pH of 5.5 to 8] <Insert range>. 3. Soluble-Salt Concentration: Less than [4] <Insert value> dS/m. 4. Moisture Content: [35 to 55] <Insert number range> percent by weight. 5. Organic-Matter Content: [30 to 40] [50 to 60] <Insert number range> percent of dry weight. 6. Particle Size: Minimum of 98 percent passing through a 2-inch (50-mm) sieve. 7. Compost Classification: Class I or Class II compost B. Sphagnum Peat: Partially decomposed sphagnum peat moss, finely divided or of granular texture with 100 percent passing through a [1/2-inch] <Insert dimension> sieve, a pH of 3.4 to 4.8, and a soluble-salt content measured by electrical conductivity of [maximum 5] <Insert value or range> dS/m. C. Muck Peat: Partially decomposed moss peat, native peat, or reed-sedge peat, finely divided or of granular texture with 100 percent passing through a [1/2-inch] <Insert dimension> sieve, a pH of 6 to 7.5, a soluble-salt content measured by electrical conductivity of [maximum 5] <Insert value or range> dS/m, having a water-absorbing capacity of 1100 to 2000 percent, and containing no sand. D. Wood Derivatives: Shredded and composted, nitrogen-treated sawdust, ground bark, or wood waste; of uniform texture and free of chips, stones, sticks, soil, or toxic materials. 1. Partially Decomposed Wood Derivatives: In lieu of shredded and composted wood derivatives, mix shredded and partially decomposed wood derivatives with ammonium nitrate at a minimum rate of [0.15 lb/cu. ft.] <Insert value> of loose sawdust or ground bark, or with ammonium sulfate at a minimum rate of [0.25 lb/cu. ft.] <Insert value> of loose sawdust or ground bark. E. Manure: Well-rotted, unleached, stable or cattle manure containing not more than 25 percent by volume of straw, sawdust, or other bedding materials; free of toxic substances, stones, sticks, soil, weed seed, debris, and material harmful to plant growth. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 12 2.4 FERTILIZERS A. Superphosphate: Commercial, phosphate mixture, soluble; a minimum of [20] [33] [50] percent available phosphoric acid. B. Commercial Fertilizer: Commercial-grade complete fertilizer of neutral character, consisting of fast- and slow-release nitrogen, 50 percent derived from natural organic sources of urea formaldehyde, phosphorous, and potassium in the following composition: 1. Composition: [1 lb/1000 sq. ft.] <Insert value> of actual nitrogen, 4 percent phosphorous, and 2 percent potassium, by weight. 2. Composition: Nitrogen, phosphorous, and potassium in amounts recommended in soil reports from a qualified testing agency. C. Slow-Release Fertilizer: Granular or pelleted fertilizer consisting of 50 percent water-insoluble nitrogen, phosphorus, and potassium in the following composition: 1. Composition: 20 percent nitrogen, 10 percent phosphorous, and 10 percent potassium, by weight. 2. Composition: Nitrogen, phosphorous, and potassium in amounts recommended in soil reports from a qualified testing agency. D. Chelated Iron: Commercial-grade FeEDDHA for dicots and woody plants, and commercial- grade FeDTPA for ornamental grasses and monocots. PART 3 - EXECUTION 3.1 GENERAL A. Place planting soil and fertilizers according to requirements in other Specification Sections. B. Verify that no foreign or deleterious material or liquid such as paint, paint washout, concrete slurry, concrete layers or chunks, cement, plaster, oils, gasoline, diesel fuel, paint thinner, turpentine, tar, roofing compound, or acid has been deposited in planting soil. C. Proceed with placement only after unsatisfactory conditions have been corrected. 3.2 PREPARATION OF UNAMENDED, ON-SITE SOIL BEFORE AMENDING A. Excavation: Excavate soil from designated area(s) to a depth of 6 inches (150-mm) and stockpile until amended. B. Unacceptable Materials: Clean soil of 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 that are harmful to plant growth. The soil shall have no herbicides, heavy metals, biological toxins or hydrocarbons that impact plant growth or exceed the EPA’s standards for soil contaminant. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 13 C. Unsuitable Materials: Clean soil to contain a maximum of 5 percent (5%) by volume of stones, roots, plants, sod, clay lumps, and pockets of coarse sand. 1. Site shall be free of rocks and debris over one-inch (1”) diameter in size. Rocks and debris 0.5 inch (0.5”) to one inch (1”) shall not exceed 5 percent (5%) by volume and gravel 0.6 inch (0.6”) to 1.25 inches (1.25”) shall not exceed 5 percent (5%) by volume. Particles such as concrete, brick, glass, metal, wood or plastic greater than 1 inch (1”) shall not be allowed. The total volume of these materials smaller than one inch (1”) shall not exceed 5 percent (5%). 2. Site shall be free of dirt clods over three-quarter inch (3/4”) diameter in size. Dryland seed areas may contain dirt clots up to two-inch (2”) diameter in size. D. Screening: Pass unamended soil through a 1-inch (25-mm) sieve to remove large materials. 3.3 PLACING AND MIXING PLANTING SOIL OVER EXPOSED SUBGRADE A. General: Apply and mix unamended soil with amendments on-site to produce required planting soil. Do not apply materials or till if existing soil or subgrade is frozen, muddy, or excessively wet. B. Subgrade Preparation: Till subgrade to a minimum depth of [4 inches] [6 inches] [8 inches] [12 inches] [18 inches] <Insert dimension>. Remove stones larger than [1-1/2 inches] [2 inches] [3 inches] <Insert dimension> in any dimension and sticks, roots, rubbish, and other extraneous matter and legally dispose of them off Owner's property. 1. Apply, add soil amendments, and mix approximately half the thickness of unamended soil over prepared, loosened subgrade according to "Mixing" Paragraph below. Mix thoroughly into top [2 inches] [4 inches] of subgrade. Spread remainder of planting soil. C. Mixing: Spread unamended soil to total depth [of 4 inches] [of 6 inches] [of 8 inches] [of 12 inches] [indicated on Drawings] <Insert dimension>, but not less than required to meet finish grades after mixing with amendments and natural settlement. Do not spread if soil or subgrade is frozen, muddy, or excessively wet. 1. Amendments: Apply soil amendments and fertilizer, if required, evenly on surface, and thoroughly blend them to a minimum depth of six inches (6”) with unamended soil to produce planting soil. Organic mulch shall be applied at one (1) cubic yard per eighty (80) square feet at a depth of four (4) inches, and as appropriate to each species. a. A minimum of four (4) cubic yards of organic matter soil amendment per one- thousand square feet of landscaped area shall be required as necessary to meet the 5 percent (5%) organic matter specification. b. Mix lime and sulfur with dry soil before mixing fertilizer. c. Mix fertilizer with planting soil no more than seven days before planting. 2. Lifts: Apply and mix unamended soil and amendments in lifts not exceeding [8 inches] [12 inches] <Insert dimension> in loose depth for material compacted by compaction equipment, and not more than [4 inches] [6 inches] in loose depth for material compacted by hand-operated tampers. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 14 D. Compaction: Compact each blended lift of planting soil to [75 to 82] <Insert number range> percent of maximum Standard Proctor density according to ASTM D 698 and tested in- place[ except where a different compaction value is indicated on Drawings]. E. Finish Grading: Grade planting soil to a smooth, uniform surface plane with loose, uniformly fine texture. Roll and rake, remove ridges, and fill depressions to meet finish grades. 1. Site shall be graded within two-tenths of a foot (2/10) of the grading plan. 3.4 PLACING MANUFACTURED PLANTING SOIL OVER EXPOSED SUBGRADE A. General: Apply manufactured soil on-site in its final, blended condition. Do not apply materials or till if existing soil or subgrade is frozen, muddy, or excessively wet. B. Subgrade Preparation: Till subgrade to a minimum depth of 6 inches. Remove stones larger than [1-1/2 inches] [2 inches] [3 inches] <Insert dimension> in any dimension and sticks, roots, rubbish, and other extraneous matter and legally dispose of them off Owner's property. 1. Apply approximately half the thickness of planting soil over prepared, loosened subgrade. Mix thoroughly into top [2 inches] [4 inches] of subgrade. Spread remainder of planting soil. C. Application: Spread planting soil to total depth [of 4 inches] [of 6 inches] [of 8 inches] [of 12 inches] [indicated on Drawings] <Insert dimension>, but not less than required to meet finish grades after natural settlement. Do not spread if soil or subgrade is frozen, muddy, or excessively wet. 1. Lifts: Apply planting soil in lifts not exceeding [8 inches] [12 inches] <Insert dimension> in loose depth for material compacted by compaction equipment, and not more than [4 inches] [6 inches] in loose depth for material compacted by hand-operated tampers. D. Compaction: Compact each lift of planting soil to [75 to 82] <Insert number range> percent of maximum Standard Proctor density according to ASTM D 698[ except where a different compaction value is indicated on Drawings]. E. Finish Grading: Grade planting soil to a smooth, uniform surface plane with loose, uniformly fine texture. Roll and rake, remove ridges, and fill depressions to meet finish grades. 3.5 BLENDING PLANTING SOIL IN PLACE A. General: Mix amendments with in-place, unamended soil to produce required planting soil. Do not apply materials or till if existing soil or subgrade is frozen, muddy, or excessively wet. B. Preparation: Till unamended, existing soil in planting areas to a minimum depth of [of 4 inches] [of 6 inches] [of 8 inches] [of 12 inches] [of 18 inches] [indicated on Drawings] <Insert dimension>. Remove stones larger than [1-1/2 inches] [2 inches] [3 inches] <Insert dimension> in any dimension and sticks, roots, rubbish, and other extraneous matter and legally dispose of them off Owner's property. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 15 C. Mixing: Apply soil amendments[, except compost,] and fertilizer, if required, evenly on surface, and thoroughly blend them into full depth of unamended, in-place soil to produce planting soil. 1. Mix [lime] [and] [sulfur] with dry soil before mixing fertilizer. 2. Mix fertilizer with planting soil no more than seven days before planting. D. Compaction: Compact blended planting soil to [75 to 82] <Insert number range> percent of maximum Standard Proctor density according to ASTM D 698[ except where a different compaction value is indicated on Drawings]. E. Finish Grading: Grade planting soil to a smooth, uniform surface plane with loose, uniformly fine texture. Roll and rake, remove ridges, and fill depressions to meet finish grades. 3.6 APPLYING COMPOST TO SURFACE OF PLANTING SOIL A. Application: Apply [compost component of planting-soil mix] [4 inches of compost] [6 inches of compost] <Insert depth> to surface of in-place planting soil. Do not apply materials or till if existing soil or subgrade is frozen, muddy, or excessively wet. B. Finish Grading: Grade surface to a smooth, uniform surface plane with loose, uniformly fine texture. Roll and rake, remove ridges, and fill depressions to meet finish grades. 3.7 LAYERED SOIL ASSEMBLIES A. Layered Soil Assembly <Insert designation>: 1. [Top Layer] <Insert layer designation>: Planting-soil type <Insert drawing designation>. 2. <Insert layer designation>: Planting-soil type <Insert drawing designation>. 3.8 FIELD QUALITY CONTROL A. Testing Agency: [Owner will engage] [Engage] a qualified testing agency to perform tests and inspections. B. Perform the following tests[ and inspections]: 1. Compaction: Test planting-soil compaction after placing each lift and at completion using a densitometer or soil-compaction meter calibrated to a reference test value based on laboratory testing according to ASTM D 698. Space tests at no less than one for each [1000 sq. ft.] [2000 sq. ft.] <Insert dimension> of in-place soil or part thereof. 2. <Insert name of test>: <Insert requirement>. 3. <Insert name of inspection>: <Insert requirement>. C. Soil will be considered defective if it does not pass tests[ and inspections]. D. Prepare test[ and inspection] reports. 06/24/2019 Aspen City Offices City Comments Aspen, CO May 13, 2019 SOIL PREPARATION 329113 - 16 E. Label each sample and test report with the date, location keyed to a site plan or other location system, visible conditions when and where sample was taken, and sampling depth. 3.9 PROTECTION A. Protection Zone: Identify protection zones according to Section 015639 "Temporary Tree and Plant Protection." B. Protect areas of in-place soil from additional compaction, disturbance, and contamination. Prohibit the following practices within these areas except as required to perform planting operations: 1. Storage of construction materials, debris, or excavated material. 2. Parking vehicles or equipment. 3. Vehicle traffic. 4. Foot traffic. 5. Erection of sheds or structures. 6. Impoundment of water. 7. Excavation or other digging unless otherwise indicated. C. If planting soil or subgrade is overcompacted, disturbed, or contaminated by foreign or deleterious materials or liquids, remove the planting soil and contamination; restore the subgrade as directed by Architect and replace contaminated planting soil with new planting soil. 3.10 CLEANING A. Protect areas adjacent to planting-soil preparation and placement areas from contamination. Keep adjacent paving and construction clean and work area in an orderly condition. B. Remove surplus soil and waste material including excess subsoil, unsuitable materials, trash, and debris and legally dispose of them off Owner's property unless otherwise indicated. 1. Dispose of excess subsoil and unsuitable materials on-site where directed by Owner. END OF SECTION 329113 06/24/2019