1240LU24Q0046 Attachment 4 Specifications Septic Tank Buffalo Gap CG Septic DPG.docx
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- Solicitation number
- 1240LU24Q0046
- Issued by
-
Department of Agriculture Forest Service
About this file
This document is a set of technical specifications for the installation of a new 2,000 gallon traffic-rated septic tank at the Buffalo Gap Campground in North Dakota. The work includes connecting the new tank to the existing RV dump station and lift station using Schedule 40 PVC pipe. The project also requires saw-cutting and replacing a portion of the asphalt roadway to accommodate the new septic tank. Key details include the project location, general site conditions, allowances for camping and lodging, required permits, and earthwork and paving requirements. The septic tank must meet certain material, access, and performance specifications. This document appears to be part of the solicitation materials for Solicitation Number 1240LU24Q0046, GAOA Buffalo Gap Campground Septic System Dakota Prairie Grasslands, issued by the U.S. Department of Agriculture Forest Service.
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SECTION 011000 SUMMARY OF WORK
PART 1 - GENERAL
1.1 SUMMARY
A. Work for this project consists of installation of a new 2,000 gallon traffic rated septic tank for the RV dump station. The tank will be placed in the existing roadway, which will require saw-cutting and removing a portion of the asphalt, as shown on the drawings. Schedule 40 PVC pipe shall be installed to connect the existing RV dump station to the inlet of the tank, and from the outlet of the tank to the existing manhole upstream of the lift station. The asphalt removed for the tank installation shall be replaced. The existing lift station shall be pumped.
1.2 LOCATION
A. This project is located at the Buffalo Gap Campground, approximately 40 miles west of Dickinson, North Dakota, on the Medora Ranger District of the Dakota Prairie Grasslands. It is located North off of I-94, Exit 18, near Medora, ND.
1.3 GENERAL SITE CONDITIONS AND WEATHER
A. The elevation of the site is approximately 2580 feet above mean sea level. The construction site has a cold semi-arid climate, and experiences snowfall and cold temperatures, with snow on the ground typically from mid-October through April.
B. In-depth soil surveys have not been performed. Blasting of rocks will not be permitted.
C. In-depth water table surveys have not been performed; however, if water is encountered during excavation, the Contractor shall perform adequate dewatering to keep the excavation free from water and dispose of the water without damage to property.
1.4 USE OF PREMISES
A. General: Contractor shall have full use of premises for construction operations, including use of Project site, during construction period. Contractor's use of premises is limited only by the Government's right to perform work or to retain other contractors on portions of Project.
B. Contractor shall at all times conduct his operations to ensure the least inconvenience to the public and employees. The campground will remain open to the public during construction. Road closures will be permitted, when required, upon written approval of the Contracting Officer (CO).
C. Confine storage of materials to areas as approved by the CO.
D. Contractor shall provide adequate signing and barricades and take necessary safety measures to protect the public during all construction operations. Contractor shall minimize disturbance of all undisturbed areas.
011000- 1
SUMMARY OF WORK
E. Preservation of Natural Feature: Confines all operations to work limits of the project. Prevent damage to natural surroundings. Restore damaged areas, repairing or replacing damaged pavement, trees and plants, at no additional expense to the Government.
1. Provide temporary barriers to protect existing trees and plants and root zones.
2. Do not remove, injure, or destroy trees or other plants without prior approval. Consult with CO and remove agreed-on roots and branches that interfere with construction.
3. Do not fasten ropes, cables, or guys to existing trees.
4. Carefully supervise excavating, grading, filling, and other construction operations near trees to prevent damage.
F. Existing Utilities: Notify CO and utility companies of proposed locations and times for excavation.
1. Contractor shall be responsible for locating and preventing damage to known utilities. If damage occurs, repair utility at no additional expense to the Government.
2. Interruption of Existing Utility Service: Notify CO, 48 hours in advance of any interruption of existing utilities.
1.5 MEALS AND LODGING
A. Meals and lodging are commercially available in the City of Medora within 10 miles of the construction site. Meals will not be available at Forest Service facilities.
1.6 CAMPING
A. With approval by the Medora Ranger District, the Contractor will be allowed to have a fully contained recreation vehicle which may remain at this site for security and for lodging.
1.7 CONSTRUCTION SEQUENCE
A. There is no specified construction sequence for this project.
B. Depending on conditions, normal fire restrictions may apply to activities associated with this project.
C. Utilities are not available on site.
1.8 FIELD VERIFICATION
A. Field verify all new and existing dimensions affecting the work of this contract before ordering products.
1.9 PERMITS
A. Special permits for electrical work or any other permits required by County, State, or Federal laws or regulations shall be obtained by the Contractor.
PART 2 - PRODUCTS (Not Used) PART 3 - EXECUTION (Not Used)
END OF SECTION 011000
SECTION 312000 EARTH MOVING
PART 1 - GENERAL
1.1 SUMMARY
A. This Section includes the following:
1. Excavating and backfilling for septic tank and utility trenches.
| B. | Unauthorized excavation consists of excavation below subgrade elevations or beyond indicated lines and dimensions without direction by CO. Unauthorized excavation, as well as remedial work directed by CO, shall be without additional compensation. |
| C. | Utility Locator Service: Notify “Call Before You Dig” for area where Project is located before beginning earth moving operations. |
1.2 PROJECT CONDITIONS
A. Existing Utilities: Do not interrupt utilities serving facilities occupied by Government or others unless permitted in writing by Contracting Officer and then only after arranging to provide temporary utility services according to requirements indicated:
1. Notify Contracting Officer not less than five days in advance of proposed utility interruptions.
2. Do not proceed with utility interruptions without Contracting Officer's written permission.
3. The Contractor shall contact local digger’s hotline, for buried cable location identification, 72 hours before doing any excavating on site. The Contractor shall locate and mark all buried electric lines prior to excavation.
B. The locations of existing underground utilities Shown on the Drawings are approximate. The Contractor shall repair at his own expense any damaged underground utilities shown on the Drawings, located by the Government, or those identified by the utility companies.
1.3 MEASUREMENT AND PAYMENT
A. There will be no separate measurement or payment for work in this Section. Earthwork is considered incidental to other items of work shown in the Schedule of Items.
PART 2 - PRODUCTS
2.1 MATERIALS
A. Excavated material may be processed and used for backfill if the Contractor can show compliance with the material specified herein to the satisfaction of the Contracting Officer. If
312000-1
EARTH MOVING
excavated material is not sufficient to meet requirements, Contractor shall import needed material.
| B. | Satisfactory Soil: ASTM D 2487 Soil Classification Groups GW, GP, GM, SW, SP, and SM; free of rock or gravel larger than 3 inches in any dimension, debris, waste, frozen materials, vegetation, or other deleterious matter. |
| C. | Unsatisfactory Soil: ASTM D 2487 Soil Classification Groups GC, SC, ML, MH, CL, CH, OL, OH, and PT. |
D. Backfill and Fill: Satisfactory soil materials.
1. Remove rocks over 8 inches in maximum dimension, ice or frozen earth, muck, debris, and earth with high void content.
2. Remove rocks over 3 inches in maximum dimension for backfill placed within 12 inches of foundation.
E. Subbase Material: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; with at least 90 percent passing a 1-1/2-inch sieve and not more than 12 percent passing a No. 200 sieve.
F. Bedding Course: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; except with 100 percent passing a 1-inch sieve and not more than 8 percent passing a No. 200 sieve.
G. Impervious Fill: Clayey gravel and sand mixture capable of compacting to a dense state.
2.2 ACCESSORIES
A. Detectable Warning Tape: Acid- and alkali-resistant polyethylene film warning tape manufactured for marking and identifying underground utilities, a minimum of 6 inches wide and 5 mils thick, continuously inscribed with a description of the utility, with metallic core encased in a protective jacket for corrosion protection, detectable by metal detector when tape is buried up to 30 inches deep; colored as follows:
1. Red: Electric
2. Yellow: Gas, oil, steam, and dangerous materials.
3. Orange: Telephone and other communications.
4. Blue: Water systems.
5. Green: Sewer systems.
B. Tracer Wire: #14 copper wire, covered.
PART 3 - EXECUTION
3.1 EARTHWORK
A. Protect and maintain erosion and sedimentation controls during earth moving operations.
| B. | Protect subgrades from freezing temperatures and frost. Remove temporary protection before placing subsequent materials. |
| C. | Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout and other hazards created by earthwork operations. Repair all construction related damage to the satisfaction of the Government. |
| D. | Prevent surface water and ground water from entering excavations, from ponding on prepared subgrades, and from flooding Project site and surrounding area. |
E. Explosives: Do not use explosives.
F. Excavate to subgrade elevations regardless of character of materials and obstructions encountered.
G. Excavations left open at the end of the working day shall be fenced to protect the public.
H. Utility Trenches: Excavate trenches to indicated slopes, lines, depths, and invert elevations.
1. Place, compact, and shape bedding course to provide continuous support for pipes and conduits over rock and other unyielding bearing surfaces and to fill unauthorized excavations.
2. Place and compact initial backfill of satisfactory soil material or subbase material, free of particles larger than 1 inch, to a height of 12 inches over the utility pipe or conduit. Place and compact final backfill of satisfactory soil material to final subgrade.
| I. | Place backfill and fill in layers not more than 8 inches in loose depth at optimum moisture content. Compact each layer under septic tank to 95 percent of maximum dry unit weight according to ASTM D 698; elsewhere to 90 percent. |
| J. | Grade areas to a smooth surface to cross sections, lines, and elevations indicated. Grade lawns, walkways, and unpaved subgrades to tolerances of plus or minus 1 inch and pavements and areas within building lines to plus or minus 1/2 inch. |
| K. | Under pavements and walkways, place subbase course material on prepared subgrades and compact at optimum moisture content to required grades, lines, cross sections, and thicknesses. |
| L. | Allow testing agency to inspect and test each subgrade and each fill or backfill layer and verify compliance with requirements. |
| M. | Remove surplus satisfactory soil and waste materials, including unsatisfactory soil, trash, and debris, and legally dispose of them off Owner's property. |
END OF SECTION 312000
SECTION 321216 - ASPHALT PAVING PART 1 - GENERAL
1.1 SECTION REQUIREMENTS
A. Submittals: Submit written job-mix formulas for approval at least 28 days before production. Furnish mixes of aggregate, asphalt binder, recycled asphalt pavement, and additives that meet the applicable gradation and material requirements in one of the following:
1. Superpave designed asphalt mixture with performance grade asphalt binder PG 58-28.
2. Hveem or Marshall designed asphalt mixture as approved by the Contracting Officer.
3. State Department of Transportation approved asphalt concrete pavement mixture as approved by the Contracting Officer.
4. All Job Mix designs must be approved by the Contracting Officer.
PART 2 - PRODUCTS
2.1
ASPHALT PAVING
| A. |
| Regulatory Requirements: Comply with requirements of North Dakota DOT for asphalt paving work. |
| B. | |
| Asphalt-Paving Publication: | Comply with AI MS-22, "Construction of Hot Mix Asphalt Pavements," unless more stringent requirements are indicated. |
2.2
AGGREGATES
| A. | |
| General: | Use materials and gradations that have performed satisfactorily in previous |
installations. Must conform to aggregate requirements in FP-03 Section 703.
B. General: Use materials and gradations that have performed satisfactorily in previous installations. Must conform to aggregate requirements in FP-03 Section 703.
C. Fine Aggregate: sharp-edged natural sand or sand prepared from stone, gravel, properly cured blast-furnace slag, or combinations thereof.
321216 - 1
ASPHALT PAVING
2.3 Hot-Mix Asphalt: Dense, hot-laid, hot-mix asphalt plant mixes designed according to procedures in AI SP-2 “Superpave Mix Design”, AI MS-2, "Mix Design Methods for Asphalt Concrete and Other Hot-Mix Types.", or State Department of Transportation approved mix design. The mix design shall have a history of satisfactory performance in geographical area where project is located.
PART 3 - EXECUTION
3.1 GENERAL
A. Verify that subgrade is dry and in suitable condition to support paving and imposed loads.
B. Immediately before placing asphalt materials, remove loose and deleterious material from substrate surfaces.
C. Proceed with paving only after unsatisfactory conditions have been corrected.
D. Saw Cutting of Adjacent Pavement –
1. Make a vertical cut through the full depth of surface in a straight clean line.
2. Where the edge of the existing surface is cracked, broken, or deteriorated, make the cut so the defective surface can be removed.
3. Do not allow traffic or construction equipment to cross the cut edge.
4. Apply a tack coat (at a rate of 0.05 to 0.15 gal./sq.yd.) to the cut edge before placing hot mix asphalt surfacing.
5. Avoid smearing or staining adjoining surfaces.
3.2 MIXING
A. Hot-Mix Asphalt Pavement Mix and Mixing Plant shall conform to AASHTO M156.
3.3 PAVING
A. Tack coat existing asphalt or concrete surfaces and allow tack coat to cure undisturbed.
B. Place hot-mix asphalt to required grade, cross section, and thickness. Promptly correct surface irregularities in paving course.
1. Spread mix at minimum temperature of 250 deg F.
C. Begin compaction as soon as placed hot-mix paving will bear roller weight without excessive displacement. Compact hot-mix paving with hot, hand tampers or vibratory-plate compactors in areas inaccessible to rollers. Complete compaction before mix temperature cools to 185 deg F.
D. Complete breakdown or initial rolling immediately after rolling joints and outside edge. Examine surface immediately after breakdown rolling for indicated crown, grade, and smoothness.
E. Begin intermediate rolling immediately after breakdown rolling while hot-mix asphalt is still hot enough to achieve specified density. Continue rolling until hot-mix asphalt course has been uniformly compacted to 92 percent of reference maximum theoretical density according to ASTM D 2041.
F. Finish roll paved surfaces to remove roller marks while hot-mix asphalt is still warm.
G. While surface is being compacted and finished, trim edges of pavement to proper alignment. Bevel edges while asphalt is still hot; compact thoroughly.
H. Remove and restore paved areas that are defective or contaminated.
END OF SECTION 321216
SECTION 333613 SEPTIC TANK
PART 1 - GENERAL
1.1 SUMMARY
A. Includes furnishing and installing precast concrete septic tank with the minimum liquid capacity shown on the drawings.
1.2 APPROVED MANUFACTURER
A. Septic tanks shown on the drawings shall be an two compartment, H20 Traffic Rated, as manufactured by Billings Precast, Billings, MT, (406) 656-6098 www.billingsprecast.com or approved equal.
1.3 SUBMITTALS
A. Product Data: Submit manufactures technical product data and installation instructions for septic system's materials and products. This shall include a submittal on the tank and all appurtenances as called for on the drawings.
B. Maintenance Data: Submit maintenance data and parts lists for septic system's materials and products.
C. Submit technical product data on effluent filter.
PART 2 – PRODUCTS
2.1 GENERAL
A. Septic tank shall be precast concrete, constructed to ensure watertightness, and shall be structurally designed to withstand all anticipated earth or other loads.
B. Septic tank shall meet the requirements of NDAC chpt 62-03.1-03-07.
C. Each septic tank shall have the minimum liquid capacity noted on the plans, measured below the outlet invert. The inlet invert of the first compartment shall be 3 inches minimum above the outlet invert (flow line) of the second compartment.
D. Each compartment of the septic tank shall provide additional storage (above the liquid level corresponding to the minimum liquid capacity required) for scum. The depth of such additional storage shall be 15 to 20 percent of the liquid depth corresponding to the minimum liquid capacity required.
E. The septic tank shall be as shown on the drawings:
333613- 1
SEPTIC TANK
1. An H20 traffic rated design with two 24” diameter access holes in the top of the tank. A single tank with an interior baffles forming two watertight compartments. Each compartment shall be sized as shown on the drawings.
2.2 TANK ACCESS OPENINGS
A. Access to each tank shall be provided above the inlet and outlet and above the interior baffle when applicable. Access openings shall be 24-inch minimum diameter.
2.3 SEPTIC TANK RISER
A. 24-inch ID riser sections, tapered sections, grade rings, tops, and special sections shall conform to the requirements of ASTM C-478 for the internal diameter and type of section shown on the drawings.
2.4 MANHOLE FRAME AND COVER
A. Two D&L B-2018 cast iron ring and cover “SEWER” with two 24” diameter x 24” tall RCP access risers and two 24” dia. x 2” precast concrete adjusting rings per access to bring to final grade.
2.5 GROUT
A. Portland Cement:
1. ASTM C150.
2. Type I and II.
2.6 JOINT SEALING COMPOUND
A. ConSeal CS-102 butyl mastic joint sealant to seal center tank joint and access risers, or approved equal.
B. Joint primer shall be as recommended by the manufacturer.
2.7 WATERSTOPS
A. Press-Seal Cast-A-Seal 402 rubber boot pipe connectors with #88 ss pipe clamp for 4” Sch40 PVC inlet and outlet pipe penetrations, or approved equal.
2.8 MANHOLE COVER BOLT WRENCH
A. Supply three of each special key, wrench or tool required for opening manhole cover.
2.9 PRECAST CONCRETE UNITS
A. Cement: Cement shall comply with ASTM C 150, Type II or IIA for Portland cement.
B. Aggregate: Size of aggregate shall comply with ACI-318.
C. Concrete: Concrete shall have a minimum compressive strength of 4,000 psi at 28 days.
D. Reinforcement:
1. Reinforcement shall be plain welded wire fabric com-plying with ASTM A 82 and A 185. Percent steel per unit area shall be sufficient to ensure the structural integrity of the unit during normal handling; however, in no case shall the steel reinforcement be less than the following:
2. The minimum specified in ACI 318 for shrinkage and temperature steel; or
3. The minimum necessary to ensure the tank will be structurally capable of resisting lateral soil pressures, either empty or full, due to backfill around the tank having a unit dry weight of 110 pounds per cubic foot.
E. Thickness: Minimum bottom slab and sidewall thickness shall be 4 inches, and as shown on the drawings.
F. Top Slab: The top slab shall be of such thickness and have sufficient reinforcement (either welded wire fabric or deformed steel bars complying with ASTM A 615, A 616, or A 617) to ensure the structural integrity of the slab during normal handling, a soil cover of 3 feet at 110 pounds per cubic foot and an H-20 vehicle loading. Openings in the top slab to provide access shall have additional reinforcement as per ACI 318.
G. Joints: Modular sections shall be provided with positive interlocking joints to provide vertical alignment and prevent lateral slipping.
H. Inlet/Outlet Ports:
1. Holes in the side or end walls to accommodate piping shall be cast at time of manufacture. Such holes shall be a minimum of 8 inches in diameter and shall be circular in section. Holes shall not be cut or punched after the unit is cast.
I. Curing: All concrete modular units shall be steam cured for such time and at such temperature as deemed necessary to obtain the specified strength.
2.10 FLEXIBLE COUPLINGS
A. Diameter and size shown on the drawings, nonpressure rated as manufactured by Fernco, Inc., 300 South Dayton, Davidson, Michigan 48423, (313) 653-9626, or approved equal.
2.11 EFFLUENT FILTER
A. Shall be OSI FT0854-36 as manufactured by Orenco Systems, Inc., 1-800-348-9843, or approved equal.
2.12 SEPTIC TANK PIPE STUBS AND BAFFLE FITTINGS
A. PVC, Schedule 40, solvent weld, size as shown on the drawings.
PART 3 – EXECUTION
3.1 EXCAVATION
A. Excavation and backfill shall be in accordance with Section 312000 “Earth Moving”. Excavate sufficient width and length for tanks to depth determined by tank inlet elevation. Provide level bottom. Excavation shall be inspected and approved by the Engineer prior to tank placement.
3.2 BACKFILL
A. Backfill shall comply with Section 312000 “Earth Moving”. During backfill, do not produce undue strain on the tank and risers, and do not displace inlet and outlet invert elevations.
3.3 TESTING
A. After installation, but before backfilling, fill tank(s) with water to outlet invert and let stand a minimum of 12 hours to check for leakage. If leaks occur, mark the areas, drain the tank, and allow drying thoroughly. Grind these areas down and repair with bonding agent and grout. Recoat repaired area with appropriate surface coatings, and repeat water test. All tanks shall be watertight before backfilling. If tanks fail to be leak proof after second repair, replace with new tanks.
B. Water used to test the septic tanks shall not be disposed of in the sewage absorption field.
3.4 GENERAL
A. Joints shall be made watertight with joint sealing compound applied in accordance with the manufacturer's recommendations.
B. Inlet/outlet pipe stubs shall extend 12 inches outside the tank. Stubs shall be 4-inch PVC, grouted in place with water stop, baffle fittings, and septic solids retainer as shown on the drawings. All joints shall be solvent weld.
1. Concrete surfaces in contact with the grout shall be treated with an epoxy adhesive prior to placing the grout.
2. The access opening at the septic tank outlet must be at least 20 inches in diameter to allow installation and future maintenance of the effluent filter.
C. The Contractor shall provide flexible couplings to attach the pipe stubs to the sewer pipe being installed.
D. The concrete riser shall be set plumbed. Grout all around the concrete riser at the top slab of the septic tank as shown on the drawings.
E. Install the manhole ring and cover as shown on the drawings. Grout the annular space between the ring and concrete.
END OF SECTION 333613
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