Sky Ridge and Ridgegate Erosion Control & Seeding 02 41 13 - 1 May 2026 RTD Selective Site Demo

SECTION 02 41 13

SELECTIVE SITE DEMOLITION

PART 1 GENERAL

1.01 SECTION INCLUDES

A. This section details information regarding the removal and disposal of onsite materials including, mulch, vegetation, and irrigation materials.

1.02 QUALITY ASSURANCE

A. Comply with safety requirements for demolition, ANSI A10.6-83. Erect suitable barriers around open excavations. No blasting or burning will be permitted.

1.03 PROJECT CONDITIONS

A. Keep dust to a minimum. Use water trucks as necessary.

B. Ensure safety of persons within demolition area.

1.04 DEFINITIONS

A. Remove: Detach items from existing construction and legally dispose of them off-site unless indicated to be removed and salvaged or removed and reinstalled.

B. To Remain: Existing items of construction that are not to be permanently removed and that are not otherwise indicated to be removed, removed and salvaged, or removed and reinstalled.

C. Protect in Place: Existing items within construction limits requiring protection using 4-foot construction fence or chain link to ensure demolition does not occur around item vicinity.

1.05 SUBMITTALS

A. Schedule of Demolition Activities including:

1. Detailed sequence of selective demolition and removal work with starting and ending dates for each activity.

2. Interruption of utility services.

3. Coordination for irrigation shutoffs and interim landscape watering schedule and methods.

B. Preconstruction Photographs: At least 3 photos of each area indicating removals/demolition.

PART 2 PRODUCTS

2.01 FILL MATERIALS

A. Native Soil: If required, use native soils that are free of debris, roots, and other organic matter.

PART 3 EXECUTION

3.01 PREPARATION

A. Protect structures, pavement, utilities, electrical conduit, and vegetation to remain.

B. Set up all barriers, including those for tree protection prior to proceeding with any demolition.

3.02 DEMOLITION

A. Irrigation Equipment: Remove all existing heads and miscellaneous components as indicated on the plan that are not scheduled for relocation and turn over to RTD.

3.03 RESTORATION

A. Backfilling: Ensure that areas to be filled are free of standing water, frost, frozen material, vegetation, including roots and debris.

Sky Ridge and Ridgegate Erosion Control & Seeding 02 41 13 - 2 May 2026 RTD Selective Site Dem

B. Grading: Grade surface to blend with original contours and provide free drainage flow. All ruts and depressions where any amount of standing water collets shall be regraded to a smooth natural appearance to ensure positive drainage.

3.04 DISPOSAL

A. Remove trash, debris, and waste materials, haul and legally dispose of it off the property. All recyclable material shall be hauled to nearest recycling center and any non-recyclable materials shall be disposed offsite.

B. All salvaged material such as site furnishings, irrigation equipment, etc. shall remain the property of the RTD. Store or deliver salvaged material as directed by the Inspector.

END OF SECTION

Sky Ridge and Ridgegate Erosion Control & Seeding 31 00 00 - 1 May 2026 RTD Earthwork

SECTION 31 00 00

EARTHWORK

PART 1 GENERAL

1.01 SECTION INCLUDES

A. This section details information regarding excavation, filling, backfilling, compaction, hauling, and offsite disposal of soil materials to meet the required lines and grade as specified to complete the work.

1.02 DEFINITIONS

A. Excavation: Consists of removal of material encountered to subgrade or over-excavation and subsequent disposal or placement of materials removed.

B. Unclassified Excavation: The term unclassified excavation includes the excavation of all materials required for the work obtained within construction limits of project, including bedrock, surface boulders, wasted sections of concrete, asphalt or other debris including historic landfills that may be encountered. All excavation will be considered unclassified regardless of the nature of material encounter.

C. Subgrade: The undisturbed earth or the compacted soil layer immediately below proposed pavement topping materials.

D. Structural Fill: The term structural fill includes soil materials used for general site filling under pavements or structures.

1.03 QUALITY CONTROL

A. Codes and Standards: Comply with all applicable local, state and Federal rules, regulations and ordinances concerning sloping of excavation, trenching and safety of workers, including the latest version of OSHA requirement.

B. Reference Standards: Comply with the requirements of the reference standards noted herein, except where more stringent requirements are listed herein or otherwise required by the Contract Documents, to include specifications of local agencies exercising jurisdiction over this project.

1.04 PROJECT CONDITIONS

A. Existing Utilities: The Contractor shall contact all public utility companies and determine the location of all existing underground utilities, both public and private, prior to proceeding with construction. All work performed in the area of public utilities shall be performed according to the requirements of these agencies. The Contractor shall be responsible for locating any existing utility (including depth) which may conflict with the proposed construction. The Contractor shall contact Utility Notification Center of Colorado at 811 and other local utilities for existing utility locations. The Contractor shall protect, at his own expense, all existing utilities and be responsible for their repair if they are damaged during construction.

B. Protection of Persons: Barricade open excavations occurring as part of this work and post with warning lights. Operate warning lights as recommended by authorities having jurisdiction.

Protect structures, utilities, walkways, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earthwork operations.

C. Existing Benchmarks: Carefully preserve and maintain existing benchmarks, vertical/horizontal control, monuments, property line pipes and pins, and other reference points. If disturbed or destroyed, restore or replace at no additional cost to the RTD.

Sky Ridge and Ridgegate Erosion Control & Seeding 31 00 00 - 2 May 2026

1.05 SUBMITTALS

A. Provide a verified report of 1 cubic foot sample of imported backfill material for approval by the Project

Manager.

B. The Contractor shall provide gradation tests, liquid limit, plasticity index, and standard proctor density test.

C. The Contractor shall also provide a soil analysis test be performed to determine pH, C/N ratio, Moisture %, Organic Matter %, and Soluble Salts. Soil test shall also provide amendment recommendations.

2.01 FILL MATERIALS

A. General: All fill material must be clean and free from organic matter, roots, brush or other debris or other detrimental substances, and rocks or unbroken lumps larger than 3 inches. The Inspector shall approve the material prior to placement.

B. Structural Fill: Existing soils obtained from on-site excavations, including granular or aggregate base course from removed pavements shall be free of organic matter or any other deleterious substances, including overly wet soils, bedrock, or high swell content soils. If sufficient materials meeting the above requirements are not available from on-site sources, provide additional material obtained from off-site sources and approved by the testing and inspections agency, at no additional cost to the RTD. The soil must be compactable and pass at minimum a proof roll prior to being accepted for supporting paving materials.

C. Onsite Topsoil: The top 4 inches of organic material within the excavation area, shall be stripped and stockpiled prior to other earthwork operations.

3.01 EXAMINATION

A. Verification of Conditions: Examine areas and conditions under which the work will be performed. Do not proceed with the work until unsatisfactory conditions have been corrected.

Commencement of work implies acceptance of all areas and conditions.

3.02 GENERAL PROCEDURES:

A. Existing Utilities: Locate existing underground utilities in areas of the work. If utilities are to remain in-place, provide protection during earthwork operations. Should uncharted or incorrectly charted piping or other utilities be encountered during excavation, consult the Inspector immediately for direction. Cooperate with utility companies in keeping respective permanent and temporary utility services and facilities in operation. Repair damaged utilities to the satisfaction of the appropriate utility company.

B. Erosion Control: Erosion Control shall be maintained during all phases of site excavation and site development and maintained throughout the construction period in order to protect adjacent properties, streets, and storm sewers from erosion and sediment runoff during the construction process. Do not commence excavation and grading work until erosion control measures are in place. Contractor shall be responsible for maintaining erosion control measures throughout construction. Frequent monitoring, cleaning and other work required for proper operation shall be Contractor's responsibility. Contractor shall modify/replace all erosion control measures to fit field conditions after continual monitoring by the Inspector.

Sky Ridge and Ridgegate Erosion Control & Seeding 31 00 00 - 3 May 2026

3.03 GROUND SURFACE PREPARATION

A. Complete clearing and grubbing operations. Where new material is to be placed on compacted subgrade, scarify ground surface until surface is free from ruts, hummocks or other uneven features, which would prevent uniform compaction and bond between old and new material.

B. Prior to placing asphalt or concrete pavement, the entire subgrade shall be scarified to a depth of 8 inches. Adjust moisture content and compact as specified.

3.04 STRIPPING AND STOCKPILING OF TOPSOIL

A. Strip all topsoil from the excavation zone for new facilities (4-inch depth for all disturbed areas).

Stockpile topsoil in locations indicated as directed by the Project Manager.

3.05 EXCAVATION

A. Comply with local codes, ordinances, and requirements of agencies having jurisdiction to include the latest revision to OSHA standards.

B. Excavation for Structures: Conform to elevations and dimensions shown within a tolerance of plus/minus one tenth of a foot, and extending a sufficient distance to permit installation of services and other construction.

C. Excavation for Pavement: cut surface under pavement to comply with elevations and grades as indicated within a tolerance of plus/minus one tenth of a foot.

3.06 DEWATERING

A. Wherever possible, prevent surface water and groundwater from flowing into excavations and from flooding the project site and surrounding area.

B. The Contractor shall be required to dewater excavated areas by pumping, or otherwise control the water so that the project can be constructed in accordance with the plans. Any controlling of the water must be performed in such a manner that recently constructed portions of the project are not damaged. Repairs shall be at the Contractor’s expense.

C. Damage to adjacent property that results from the Contractor’s alteration of any surface drainage, ground water flows or pumped water shall be repaired by the Contractor at no additional cost to the RTD.

3.07 SPECIAL CONDITIONS

A. Cold Weather Protection: Protect excavation bottoms against freezing when atmospheric temperature is less than 35 degrees.

B. Unanticipated Conditions: Notify the Inspector immediately upon finding subsurface or other conditions which are not shown or which cannot be reasonably assumed from existing surveys.

Secure Inspector’s instructions before proceeding with further work in such areas.

C. Unsatisfactory Soils: Remove or correct unsanitary or unsatisfactory soil. Remove contaminated or unsuitable material from under paved areas.

D. Additional Excavation: When excavation has reached required subgrade elevations, the Contractor shall contact the testing agency, which will make an observation of conditions. If unsuitable bearing materials are encountered at required subgrade elevations, carry excavations deeper and replace excavated material as directed by the testing agency.

3.08 FILL AND BACKFILL

A. Place soil material in layers to required subgrade elevations, for each area classification listed below, using materials specified in this Section.

1. Under grassed areas, use satisfactory excavated or borrow material.

Sky Ridge and Ridgegate Erosion Control & Seeding 31 00 00 - 4 May 2026

2. Under walks and pavements, use satisfactory excavated or borrow materials, or a combination to meet structural fill requirements.

B. Backfill excavations as promptly as work permits, but not until completion of the following:

1. Inspection, testing, approval, and recording locations of underground utilities have been performed and recorded.

2. Removal of all trash and debris from excavation.

3.09 PLACEMENT AND COMPACTION

A. Ground Surface Preparation: Remove unsatisfactory soil materials, obstructions, and deleterious materials from ground surface prior to placement of fills. Ground surfaces that are steeper than 4:1 shall be stripped and scarified to a depth of 6 inches and create excavated benches to ensure that fill material will bond with the existing surface.

B. Place backfill and fill materials in layers not more than 8 inches in loose depth for material compacted by heavy compaction equipment, and not more than 4 inches in loose depth for material compacted by hand-operated tampers, each layer to be compacted to meet requirements.

C. Before compaction, moisten or aerate each layer as necessary to provide optimum moisture content. Compact each layer to required percentage of maximum dry density or relative dry density for each area classification. Do not place backfill or fill material on surfaces that are muddy, frozen, or contain frost or ice.

D. Compaction for Hardscape Areas:

1. Fill material shall be placed and mixed in evenly spread layers. After each fill layer has been placed, it shall be uniformly compacted. Fill material shall be placed such that the thickness of loose material does not exceed 8 inches and the compacted lift thickness does not exceed 6 inches.

2. Compaction shall be obtained by the use of sheepsfoot rollers, multiple-wheel pneumatic-tired rollers, or other equipment approved by the Inspector. Granular fill shall be compacted using vibratory equipment or other equipment approved by the Inspector.

Compaction of each layer shall be continuous over the entire area. Compaction equipment shall make sufficient passes to ensure that the required density is obtained.

3. Prior to placement of any base or surfacing materials, 100% of the subgrade shall be proof rolled with a fully loaded tandem-axle truck.

E. Compaction for Landscape Areas:

1. Fill slopes shall be compacted by means of sheepsfoot rollers or other suitable equipment.

Compaction operations shall be continued until slopes are stable, but not too dense for planting, and there is no appreciable amount of loose soils on the slopes. Permanent fill slopes shall not exceed 4:1.

2. Where natural slopes are steeper than 20% in grade and the placement of fill is required, cut benches shall be provided at the rate of one bench for each 5 feet in height (minimum of two benches). Benches shall be at least 10 feet in width. Fill shall be placed on completed benches as outlined within this specification.

F. Place backfill and fill materials evenly adjacent to structures, piping, or conduit to required elevations. Prevent wedging action of backfill against structures by carrying material uniformly around structure, piping, or conduit to approximately same elevation in each lift.

G. Control soil and fill compaction, providing minimum percentage of density specified. Correct improperly compacted areas or lifts as directed if soil density tests indicate inadequate compaction.

H. Density Testing: Field density tests shall be made by the Contractor. Locations and depths selected by the Inspector. Where sheepsfoot rollers are used, the soil may be disturbed to a depth of several inches. Density tests shall be taken in compacted material below the disturbed surface. When density tests indicate that the density or moisture content of any layer of fill or portion is below that required, the particular layer or portion shall be reworked until the required

Sky Ridge and Ridgegate Erosion Control & Seeding 31 00 00 - 5 May 2026 density or moisture content has been achieved. Criteria for acceptance are as follows:

1. Under Pavements and Structures: Intervals and quantities of tests required shall be established by the Engineer and approved by the Inspector. Onsite or imported clay materials shall be compacted to at least 95% of maximum standard Proctor dry density (ASTM D 698) at moisture content within 2% of optimum. Granular material, whether imported or developed onsite, shall be moisture conditioned to within 2% of optimum and compacted to at least 95% of maximum modified Proctor dry density (ASTM D 1557).

2. Under Landscape Areas: 85% of maximum standard Proctor dry density at moisture content within 2% of optimum (ASTM D 698).

3.10 GRADING

A. General: Uniformly grade areas within project limits of grading including adjacent transition areas. Smooth finished surface within specified tolerances, compact with uniform levels or slopes between points where elevations or contours are indicated or between such points and existing grades.

B. Subgrade tolerances are as follows:

1. Landscape and Sod Areas: Finish areas to receive topsoil to within not more than one tenth of a foot above or below required subgrade elevations.

2. Pavement: Shape surface of areas under pavement to line, grade, and cross-section, with finish surface not more than two hundredths of a foot above or below required subgrade elevation.

C. Under no circumstances shall variations from specified grade elevations create any ponding or retention of water on intermediate pavement levels or finished surfaces.

3.11 MAINTENANCE

A. Settling: Where settling is measurable or observable at excavated areas during general project warranty period, remove surface (pavement, lawn, or other finish), add backfill material, compact, and replace surface treatment. Restore appearance, quality, and condition of surface or finish to match adjacent work and eliminate evidence of restoration to greatest extent possible.

3.12 DISPOSAL OF EXCESS AND WASTE MATERIALS

A. Removal from the project site all waste materials, including materials not allowed for fill, backfill or site grading as specified within, trash, contaminated materials, and debris, and legally dispose of it off the property at Contractor's expense.

Sky Ridge and Ridgegate Erosion Control & Seeding 31 11 00 - 1 May 2026 RTD Clearing and Grubbing

SECTION 31 11 00

CLEARING AND GRUBBING

PART 1 GENERAL

1.01 SECTION INCLUDES

A. This section details information regarding stripping sod as well as removal and disposal of miscellaneous existing vegetation, mulch, and debris.

A. Sod Stripping: Refers to removal of vegetative, mowable material, generally less than 12 inches tall.

B. Tree Removal: Refers to removal of individual woody plants with a caliper over 2 inches.

C. Clearing and Grubbing: Refers to all other plant removals.

N/A

3.01 PROTECTION

A. Locate, identify and protect trees and improvements indicated to remain.

3.02 TEMPORARY EROSION AND SEDIMENTATION CONTROL

A. Provide temporary erosion- and sedimentation-control measures to prevent soil erosion and discharge of soil-bearing water runoff or airborne dust to adjacent properties and walkways, according to erosion- and sedimentation-control Drawings and requirements of authorities having jurisdiction.

B. Verify that flows of water redirected from construction areas or generated by construction activity do not enter or cross protection zones.

C. Inspect, maintain, and repair erosion- and sedimentation-control measures during construction until permanent vegetation has been established.

D. Remove erosion and sedimentation controls and restore and stabilize areas disturbed during removal.

3.03 EXISTING UTILITIES

A. Locate and identify existing utilities indicated on the plans and identified by utility location services.

1. Protect all underground utilities for duration of construction.

2. Assure that sufficient soil coverage over underground utilities exists to support heavy equipment needed to accomplish the work.

3. Locate, identify, and disconnect utilities indicated to be abandoned in place.

3.04 CLEARING AND GRUBBING

A. Clearing: Remove brush and vegetation from areas designated to be cleared. As directed by

Sky Ridge and Ridgegate Erosion Control & Seeding 31 11 00 - 2 May 2026 RTD Clearing and Grubbing the Inspector, trim low hanging, unsound, or unsightly branches on trees and shrubs designated to remain. All cuts shall be in accordance with current industry standards.

B. Grubbing: Remove all stumps, roots, and debris a minimum of 12 inches below finish grade in all areas as required. Use hand methods for grubbing inside drip line of trees to remain.

Backfill and compact stump and root holes to a maximum of 85% in landscape areas and 95% under hardscape areas.

C. Sod Stripping: Strip sod in all areas to be regraded or surfaced so that a clean dirt surface remains.

D. Tree Removal: In all proposed landscape areas, stumps and surface roots shall be ground a minimum of 12 inches below finish grade. In proposed hardscape areas, all roots shall be removed entirely.

3.05 DISPOSAL

A. Haul and dispose of all removed materials, trash, debris and waste materials legally outside of the site.

Sky Ridge and Ridgegate Erosion Control & Seeding 32 91 13 - 1 May 2026 RTD Soil Preparation

SECTION 32 91 13

SOIL PREPARATION

PART 1 GENERAL

1.01 SECTION INCLUDES

A. This section details information regarding the preparation of soil for the purpose of planting, sodding, and/or seeding operations. Soil preparation consists of ripping, fertilizing, soil amendments, soil conditioning, and fine grading the topsoil. Soil preparation as specified herein must precede all planting.

A. Fertilizer: A substance that is added to soil to help the growth of plants.

B. Soil Amendment: Any substance which is intended to improve the physical, chemical, or other characteristics of the soil.

C. Soil Conditioner: A combination of slow-release fertilizer, humate, and Mycorrhiza.

1.03 SOIL TESTING

A. Testing Agency: Retain 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 the types of tests to be performed.

1. Laboratories: Subject to compliance with requirements, provide testing of materials in the

Section by a qualified testing laboratory approved by the Project Manager.

B. Preconstruction Testing: Engage the approved testing agency to perform preconstruction soil analyses on existing on-site soil, imported topsoil, and pre-amended imported soil.

C. Soil Sampling Requirements

1. Sample Collection and Labeling: Have samples taken and labeled by the Contractor in the presence of the Project Manager and under the direction of the testing agency.

2. Number and Location of Samples: Minimum of 5 samples per acre collected randomly throughout the areas to receive similar soil preparation, including seed/sod, native seeding, and planting beds. Provide a site plan of the sampling locations to the Project Manager for approval, prior to sampling.

3. Procedures and Depth of Samples: Collect samples to a depth of 6-inches and combine them in a clean plastic container.

4. Mixing of Samples: Mix samples together thoroughly, removing plant debris and breaking up clods.

5. Labeling: Label each sample with the date, location keyed to a site plan or other location system, visible soil condition, and sampling depth.

D. Testing Requirements

1. Soil Texture: Soil-particle, size-distribution analysis by 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. Fertility Testing: Soil-fertility analysis shall include the following:

a) Percentage of organic matter.

b) CEC, calcium percent of CEC, and magnesium percent of CEC.

c) Soil reaction (acidity/alkalinity pH value).

d) Buffered acidity or alkalinity.

Sky Ridge and Ridgegate Erosion Control & Seeding 32 91 13 - 2 May 2026

e) Lime estimate

f) Soil texture estimate.

g) Nitrogen ppm.

h) Phosphorous ppm.

i) Potassium ppm.

j) Manganese ppm.

k) Zinc ppm.

l) Iron ppm.

m) Boron ppm.

n) Copper ppm.

o) Sodium ppm, and sodium absorption ratio.

p) Soluble-salts ppm.

q) 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.

r) Other deleterious materials, including their characteristics and content of each.

E. Recommendations: Based on the test results, provide recommendations for soil treatments, amendments, and conditioners to be incorporated to produce a soil suitable for healthy viable plant growth for the species 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 1,000 sq. ft.

for 6-inch depth of soil.

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 one thousand 1,000

sq. ft. for 6-inch depth of soil.

1.04 PRODUCT, DELIVERY, STORAGE AND HANDLING

A. Fertilizer: Deliver inorganic or chemical fertilizer to site in original unopened containers bearing manufacturer’s guaranteed chemical analysis, chemical name, trade name, trademark and conformance to state law, bearing name and warranty of producer.

2.01 SOIL MATERIALS

A. Topsoil:

1. On-site Topsoil: Topsoil previously stripped and stockpiled prior to earthwork operations.

2. Imported Topsoil: All topsoil shall be a loam or sandy loam conforming to ASTM D5268.

Topsoil shall be furnished by the Contractor and shall be a natural, friable soil representative of productive soils and shall meet the following conditions:

a. It shall be obtained from the top 6 inches of well-drained areas.

b. Fertile, friable, loamy soil, reasonably free from subsoil, refuse, roots, heavy or stiff clay, stones larger than 1-inch, coarse sand, noxious seeds, sticks, brush, litter, and other deleterious substances; suitable for the germination of seeds and the support of vegetative growth.

c. Soil Texture:

1. Sand 30% - 50%;

2. Silt 30% - 50%;

3. Clay 5% - 30%.

d. The pH value shall be between 6.0 and 7.5.

e. Soluble Salts: Less than 6.0 mmhos/cm.

f. Mechanical Analysis must meet:

Sky Ridge and Ridgegate Erosion Control & Seeding 32 91 13 - 3 May 2026

Sieve Size: % Passing % Retained 1-inch screen 100 0 ½-inch screen 97-100 0-3 #100 mesh sieve 60-40 40-60

3. Manufactured Topsoil: “Amended Topsoil” as manufactured by A1 Organics, 16350 WCR 76, Eaton, CO 80615. www. A1organics.com or substitution as approved by Project Manager.

B. Soil Amendments:

1. Turf and planting bed areas shall receive Soil Amendments unless otherwise noted or specified by the Project Manager. For the purpose of bidding, the Contractor shall assume all areas to receive soil amendments will be at 4 cubic yards per 1,000 square feet. Once soils tests have been received and determination is made on the proper amount to be added the site-specific soils the rate to be applied may be adjusted per the price based on the Schedule of Values for Soil Amendment.

2. Composted material shall consist of aged organic matter, free of weed or other noxious plant seeds, lumps, stones, or other foreign contaminants harmful to plant life, and having the following characteristics based on a nutrient test performed no longer than 3 months prior to its incorporation into the project:

a. Organic matter: 25% max.

b. Salt content: 10.0 mmhos/cm max.

c. pH: 8.0 maximum

d. Carbon to nitrogen ratio ranging from 15:1 to 30:1.

2. Mountain peat, aspen humus, gypsum and sand will NOT be accepted.

3. Acceptable product: Class I compost, such as Ecogro or Bio-comp, as produced by A1

Organics, Eaton, CO, or an approved equal.

C. Soil Conditioners:

1. Native seed areas shall receive Soil Conditioners unless otherwise noted or specified by the Project Manager. For the purpose of bidding the contractor shall assume the products listed below will be applied at the rate specified by the manufacturer for each planting type identified in the Construction Documents. Once soils tests have been received and a determination is made on the proper amount to be added to the site specific soils, the rate to be applied may be adjusted per the price based on the Schedule of Values for Soil Conditioner.

a. Organic slow release fertilizer (6-1-1), acceptable product: “Biosol” or approved equal.

b. Granular Humic Acid soil conditioner, acceptable product: “Menefee Humate Soil

Conditioner”.

c. Mycorrhizal Fungi: Dry, granular inoculant containing at least 5300 spores per lb. of vesicular-arbuscular mycorrhizal fungi and 95 million spores per lb. of ectomycorrhizal fungi, 33% hydrogel, and a maximum of 5.5% inert material.

d. Mycorrhizal Inoculant: AM-120, as manufactured by Reforestation Technologies International, locally available from Pawnee Buttes Seed, Greeley, CO, (970)356- 7002.

e. Acceptable substitution.

2.02 FERTILIZER

A. Fertilizer shall conform to applicable State fertilizer laws. It shall be uniform in composition, dry, and free flowing, and shall be delivered to the site in the original, unopened containers, each bearing the manufacturer’s guaranteed analysis. Fertilizer that has become caked or damaged will not be accepted.

B. Turf Grass Lawns: Diamonium phosphate (18-46-0). Nitrogen shall be composed of sulphur-coated area only. Provide in sufficient quantity to apply at the rate of 100 pounds nitrogen per http://www/

Sky Ridge and Ridgegate Erosion Control & Seeding 32 91 13 - 4 May 2026 acre, unless otherwise indicated by the soils tests.

2.03 HERBICIDE:

A. Post Emergent Herbicide: RoundUp (Glyphosate) as manufactured by Monsanto Company or approved equal.

3.01 PREPARATION

A. Before proceeding with soil preparation, ensure Herbicide Treatment application process and procedures have been met and approved by the Project Manager.

B. Verify that existing site conditions are as specified and indicated before beginning work. Inspect to verify that fine grading is within 0.1 foot of grades specified and indicated.

C. Erosion Control: Take measures and furnish equipment and labor necessary to control and prevent soil erosion, blowing soil and accumulation of wind-deposited materials on the site throughout the duration of work.

D. Remove weeds, debris and rocks larger than 1 inch which may hinder planting or subsequent operations.

E. Fine Grading: Perform as required to maintain positive drainage, prevent ponding and direct run-off into catch basins, drainage structures, etc., and to provide smooth well-contoured surface prior to proceeding.

F. Soil Testing: Soil amendment shall meet the minimum amounts as specified in Section 3.3.

The Contractor shall be responsible for performing horticultural soil tests on a minimum of 4 soil samples for each source of topsoil to be used in the project. Reference soil test will be used to determine the type and amount of soil organic amendment and fertilizer to be applied prior to seeding, sodding and planting.

G. Timing: Perform soil preparation just prior to planting operations and in accordance with final planting schedule. Coordinate with irrigation system installation to avoid damage.

3.02 INSTALLATION

A. Soil Preparation for Plant Beds

1. Soil Amendment: 4 cubic yards per 1,000 square feet or per soil test recommendations. If a granular soil conditioner is being utilized the product shall be applied per the manufacturer’s recommendations.

2. After applying Soil Amendments, thoroughly till the area to a minimum depth of 6-inches by plowing, rototilling, harrowing, or disking until the soil is well pulverized and thoroughly mixed.

B. Soil Preparation for Sod Areas

1. Soil Amendment: 4 cubic yards per 1,000 square feet or per soil test recommendations. If a granular soil conditioner is being utilized the product shall be applied per the manufacturer’s recommendations.

2. Fertilizer: Diamonium phosphate: 2 pounds of nitrogen per 1,000 square feet

3. After applying Soil Amendments, thoroughly till the area to a minimum depth of 6-inches by plowing, rototilling, harrowing, or disking until the soil is well pulverized and thoroughly mixed.

C. Soil Preparation for Seed Areas

1. Soil Conditioner: Apply per manufacturer’s recommendation or as per soil tests.

2. Mycorrhizal inoculants: Apply per manufacturer’s instructions and quantities appropriate to the planting type.

3. Thoroughly till the area to a minimum depth of 6-inches by plowing, rototilling, harrowing, Sky Ridge and Ridgegate Erosion Control & Seeding 32 91 13 - 5 May 2026 or disking until the soil is well pulverized and thoroughly mixed.

4. Ensure dead turfgrass is well pulverized and thoroughly mixed into the soil.

D. Fine Grading

1. Complete fine grading for all areas prior to planting, sodding, and/or seeding. Allow for natural settlement.

1. Finish grade shall be below edges of all hardscape and pavement: Allow 1-inch for seed and sod areas. Allow 3-inches for plant bed areas (mulch depth). For ground surface areas surrounding buildings to be landscaped, maintain required positive drainage away from buildings and structures.

2. Establish finish grades to within plus/minus 0.1 foot of grades indicated, in order to prevent ponding.

3. Compaction of surface grade prior to installation shall be frim, but not hard, 85% standard Proctor density within 2% optimum moisture.

4. Hand Raking: Prior to acceptance of grades, hand rake to smooth, even surface, free of debris, clods, rocks and organic matter greater than 1 inch. Native areas shall not be raked smooth but left in a uniform condition after tilling.

3.02 CLEANING

A. Remove debris and excess materials from site. Clean out drainage inlet structures. Clean paved and finished surfaces soiled as a result of work.

Sky Ridge and Ridgegate Erosion Control & Seeding 32 91 13 - 6 May 2026

Sky Ridge and Ridgegate Erosion Control & Seeding 32 92 19 - 1 May 2026 RTD Seeding

SECTION 32 92 19

SEEDING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes: All labor and materials for filling, fertilizing, seeding, and maintaining those areas noted on the drawings to receive bluegrass, transitional, and dryland/native seeded grasses.

B. Related Sections:

1. 01 33 00 – Submittals.

2. 01 71 13 - Mobilization

3. 31 10 00 – Site Clearing.

1.2 QUALITY ASSURANCE

A. Supplier Experience: Supplier of seed to have not less than five years’ experience in the supplying of the species of seed specified.

B. Installer Experience: Installation contractor to have not less than three years of successful experience in the installation of seed.

1.3 SUBMITTALS

A. Seed Mix:

Thirty days prior to delivery, supply seed mixes proposed to be used for approval by Landscape Architect. Mix to be climate sensitive and firewise.

B. Seed Testing:

1. Thirty days prior to delivery, supply official seed labels. Unlabeled collected seed may be tested and analyzed, and the results furnished in lieu of the seed label. Each seed species must be tested individually for viability.

2. Labels must provide a guaranteed statement of composition, mixture, and percentage of purity and germination of each species.

3. All seed shall be furnished in bags or containers clearly labeled to show the name and address of the supplier, the seed name, the lot number, net weight, origin, the percent of weed seed content, the pounds of pure live seed (PLS) of each seed species, and the total pounds of PLS in the container. All brands shall be free from such noxious seeds as Russian or Canadian Thistle, European Bindweed, Johnson Grass, and Leafy Spurge. The Contractor shall furnish to the Engineer a signed statement certifying that the seed is from a lot that has been tested by a recognized laboratory for seed testing within six months prior to the date of delivery. Seed which has become wet, moldy, or damaged in transit or in storage will not be acceptable.

4. Seed types and amount of PLS required per acre shall be provided in accordance with the Contract.

Sky Ridge and Ridgegate Erosion Control & Seeding 32 92 19 - 2 May 2026

5. Seed and seed labels shall conform to all current State and Federal regulations and will be subject to the testing provisions of the Association of Official Seed Analysis.

Computations for quantity of seed required on the project include the percent of purity and percent of germination.

6. If seed available on the market does not meet the minimum purity and germination percentages specified, the Contractor must compensate for a lesser percentage of purity or germination by furnishing sufficient additional seed to equal the specified product. Produce comparison shall be made on the basis of PLS in pounds, stated on each seed bag. The formula used for determining the quantity of PLS shall be:

Pounds of Seed x (Purity x Germination) = Pounds of PLS

C. Certificates: All state, federal, or other inspection certificates shall accompany the invoice for materials showing source or origin. File with Owner's representative prior to acceptance of the material:

1. Fertilizer: Certificate showing grade(s) furnished in conformance with state fertilizer laws - submit label.

2. Seed: Certificate showing weight, purity, germination, and date, for each seed mixture.

D. One amended soil analysis.

E. Hydro Mulch: Submit color sample and product information.

F. As Built Drawings.

1.4 SELECTION AND ORDERING OF SEED

A. Documentation: Submit receipts showing purchase of all seed 30 days after award of contract to the Engineer.

B. Unavailable Materials:

1. To obtain approval for substitutions, submit signed statements from five recognized seed vendors that the specified variety of seed in not available, in writing no later than 30 days after award of contract. Provide a minimum of three alternative available species, with similar physical characteristics and growing requirements for consideration by the Engineer. Substitutions must be different from species listed in the seed mix.

2. A recognized seed vendor is one who is in the business of growing or brokering for sale the seeds of domestic or native wildflowers, forbs, or grasses, and has worked in the business for three years or more.

1.5 PRODUCT DELIVERY, STORAGE, AND HANDLING

A. Seed:

1. Delivery: The Contractor shall furnish standard seed in unopened manufacturer's standard containers bearing original certification labels showing quantity, analysis, and name of manufacturer.

2. Storage: The Contractor must store seed with protection from weather, wildlife, or other conditions which would damage or impair the effectiveness of the product.

Sky Ridge and Ridgegate Erosion Control & Seeding 32 92 19 - 3 May 2026

B. Mulch: Store mulch with protection from weather or other conditions which would damage or impair the effectiveness of the product.

1.6 ANALYSES OF SAMPLES AND TESTS

A. Samples: Owner’s Representative reserves the right to receive samples of materials to analyze conformity to specifications at any time.

B. Rejected Materials: Remove rejected materials immediately from the site, at the Contractor's expense, and pay the cost of testing of materials not meeting specifications.

C. Prior to seeding, the Contractor is to obtain and pay for one soil test from Servi-Tech Laboratories 800-557-7509, Colorado State University Soil, Water, and Plant Testing Laboratory 970-491-5061, Colorado Analytical 303-659-2313 or RTD approved equal, when all soil amendments and topsoil are in place and after final grading has been approved. Take one sample from the dryland/native grass area with location approved by the Landscape Architect. The soil tests are to accurately analyze soil pH, organic matter percentage, soluble salts, trace nutrient levels CEC, particle size, and other applicable information as well as provide recommendations toward correcting any detected deficiencies or surpluses.

1.7 WARRANTY

A. Time Period: All seeded areas shall be in a healthy and flourishing condition of active growth one year from date of Substantial Completion.

B. Warranty: All seed shall be warranted for one year and be in satisfactory condition at the end of the warranted period.

1. No area larger than 3”x3” within the irrigated seeding area, 12”x12” for non-irrigated seeding areas of this project shall be void of substantial grass 45 days after the time of seeding during the growing season.

2. In addition, at the end of the warranty period a minimum of 75% coverage of specified grass species, with no noxious weeds, shall be considered acceptable. Necessary maintenance and irrigation of seed and established planting areas to maintain acceptable growing conditions is the responsibility of the contractor for the full warranty period. At any time during the warranty period that RTD determines corrective work and replacement materials are necessary in accordance with the contract, the contractor shall take corrective measures within 10 days’ notice by RTD.

1.8 REPLACEMENTS

A. Unacceptable Workmanship: Areas exhibiting conditions which are determined as unacceptable workmanship shall be repaired and/or replaced at no additional cost to the Owner.

PART 2 - PRODUCTS

2.1 SEED MIX

A. Native Seed: Mix to be approved by Landscape Architect. Mix to be climate sensitive and firewise.

Sky Ridge and Ridgegate Erosion Control & Seeding 32 92 19 - 4 May 2026

2.2 MULCH

A. On slopes less than 3:1, for seeded areas mulch shall be straw, free of seed or elements which might harm seed germination and growth, unless otherwise noted.

B. On slopes greater than 3:1, for seeded areas mulch shall be wood cellulose fiber for hydraulic mulching – unless otherwise noted. Hydraulic mulch shall not contain any substance or factor which might inhibit germination or growth of grass seed. It shall be dyed an appropriate color green to allow visual metering of its application. The wood cellulose fibers shall have the property of becoming evenly dispersed and suspended when agitated in water. When sprayed uniformly on the surface of the soil, the fibers shall form a blotter-like ground cover which readily absorbs water and allows infiltration to the underlying soil. Weight specifications from suppliers, and for all applications, shall refer only to air dry weight of the fiber, a standard equivalent to 10 percent moisture. The mulch material shall be supplied in packages having a gross weight not in excess of 100 pounds and shall be marked by the manufacturer to show the air dry weight content. The Contractor shall obtain certifications from suppliers that laboratory and field testing of their product has been accomplished, and that it meets all of the foregoing requirements pertaining to wood cellulose fiber mulch.

2.3 TACKIFIERS

Material for mulch tackifier shall consist of a free-flowing non-corrosive powder produced from the natural plant gum of Plantago insularis (Desert Indianwheat), applied in a slurry with water and wood fiber. The powder shall conform to the following requirements:

Protein Content: 1.6 + 0.2% Ash Content: 2.7 + 0.2% Fiber: 4.0 + 0.4% pH 1% Solution: 6.5 - 8.0

The material used for mulch tackifier shall not contain any mineral filler, recycled cellulose fiber, clays, or other substances which may inhibit germination or growth of plants.

2.4 WATER

Free of salts, alkaline, petroleum/oils, pesticides, herbicides, and aquacides, or any other material or substance which would deter plant germination and growth.

2.5 FERTILIZER

Inorganic commercial product of 50lbs. N and 40lbs. P fertilizer for seeding. Fertilizers shall be free-flowing and suitable for application with mechanical equipment, delivered in sealed containers, each fully labeled, conforming to the laws of the state and bearing the name, trade name or trademark, and warranty of the producer.

PART 3 - EXECUTION

3.1 GENERAL

A. If enough time has elapsed between soil preparation and seeding operations to allow any hard or smooth surfaces to develop, scarify these areas before seeding operations begin.

Scarify to a depth of four inches.

B. If the soil is in loose powder dust condition, settle by artificial watering before seeding.

Sky Ridge and Ridgegate Erosion Control & Seeding 32 92 19 - 5 May 2026

C. Contractor shall seed all disturbed areas, including any outside of the limits of work.

Seeding for areas outside the limits of work shall be at the expense of the Contractor.

D. Grades: Verify that fine grading is within 0.10 (1¼") of grades specified for areas to be sodded. Verify that fine grading is within 0.10 (1 1/4") of grades specified.

E. Approval: Do not lay seed until the Owner/Architect has examined and approved the base preparation.

3.2 PREPARATION OF SEED BED

A. General: The area to be seeded is indicated on the drawings. All weed vegetation in the area to be seeded and all debris unearthed during preparation of the seed bed, including stones larger than 1" in any dimension, shall be removed from the site. The desired finished grade shall have been shaped after construction is completed. The finished grade shall conform to the proposed final surface contour allowing for humus placement. Refer to Section 02211. Ground surfaces shall conform to the grades indicated and any deviations therefrom shall be corrected prior to seeding. Soil used for repair of erosion or correction of grade deficiencies shall be equal to that encountered in the area. A soil compaction test is required to verify seed bed is compacted less than 90% modified Proctor density at 15% moisture content.

B. Drainage: Perform fine grading required to maintain drainage into catch basins drainage structures, etc., as indicated and as required to provide a smooth well contoured surface prior to proceeding.

C. Moisture Content: Seed bed shall be sufficient to permit intimate contact of seed and soil surface, 15%.

D. Mechanical Preparation

1. See Soil Preparation Section. Do not rototill until 10 days after the final chemical application. Any type of one-way, offset, or tandem disk may be used. All existing vegetation shall be incorporated into the soil.

2. Finishing Tools- A smooth, weed-free seedbed shall be developed prior to seeding.

Implements such as spike tooth and spring tooth harrows or cultipacker rollers may be used to accomplish this.

3.3 FERTILIZER AT SEEDED AREAS

A. Form and Rate: Apply 50 pounds of available nitrogen and 40 pounds of phosphorous per acre. Refer to specific seed background for additional fertilizer information.

B. Application Method: The fertilizer shall be sprayed prior to seeding and incorporated to a depth of approximately 8 inches. Incorporation may occur during the final seedbed preparation (i.e., incorporated with a harrow).

3.4 SEEDING DATES

A. Seeding Season: September 1st until consistent ground freeze; or spring thaw until May 15th or as approved by Landscape Architect.

B. Seeding operations shall be completed last, after all other tasks have been finished.

Seeding may be done in areas where all other work has been completed, while work is on-going in other sites. However, after seeding is accomplished, no additional work is allowed in the seeded areas. If additional work is required in already seeded areas, the Contractor shall re-seed at no additional expense to the project.

Sky Ridge and Ridgegate Erosion Control & Seeding 32 92 19 - 6 May 2026

3.5 RATE OF APPLICATION

A. Seeding Rates: Seed quantities listed are on the minimum basis of pure, live seed.

B. Straw Mulch: 1,500 pounds per acre – or per seed spec.

C. Wood Fiber Mulch: 150 pounds per acre – or per seed spec.

D. Tackifier: 100 pounds per acre – or per seed spec.

E. Water for Tackifier: 700 gallons per acre – or per seed spec.

3.6 SEEDING METHOD

A. Seed shall be applied by drill seeder or other approved method that will provide an even distribution of seed. Raking seed into soil is not required, except in the case of hand seeding.

B. Native Seeding: Native seeding of all slopes 2:1 or flatter shall be accomplished by drill seeding. Depth of seed shall be between 0.25 and 0.5 inches below surface of topsoil.

Rows shall not be more than six inches apart. Sow small seed (seed with 1,000,000 or more seeds per PLS) from a separate hopper, adjusted to the proper rate of application.

C. Hand seeding is acceptable only in areas where drill seeding is not viable and is allowed in writing by the Engineer. In hand seeded areas, spread seed evenly over the area and rake lightly into soil. Hand seeding will be at the same rate as other broadcast method. Gently water in seed, causing no erosion, to a depth of one inch.

D. After seeding, spread straw mulch and mechanically crimp mulch into soil.

E. Mulch Tackifier Application: After crimping of straw mulch or application of wood fiber mulch, apply mulch tackifier.

1. Fill tank with desired amount of water and run engine at full RPM.

2. Add wood fiber. Agitate until a homogenous, non-lumpy slurry is formed. Do not add fertilizer.

3. Slowly sift powdered tackifier into slurry and continue to agitate for at least five minutes.

4. Spray onto seeded areas using a nozzle that will disperse the spray into a mist that will uniformly cover the mulch.

F. Protection: After application, the Contractor must not operate any equipment over the seeded areas.

3.7 CLEAN UP

A. General: Keep all areas of work clean, neat, and orderly at all times, and sweep all paved areas clean…