2. The two subsamples shall be taken and tested on-site for peel and shear strength.
3. If both on-site subsamples meet the acceptance criteria of Table 1, the central portion of the test sample shall be shipped for off-site destructive seam testing.
4. If either on-site or off-site test results do not meet the acceptance criteria listed in Table 1, the length of seam represented by the test sample shall be rejected.
C. Non-destructive Seam Testing - All seams s hall be non-destructively tested over the entire length of seam by at least one of the methods in Table 1.
3.3 QUALITY ASSURANCE TESTING SUMMARY
A. The CONTRACTOR shall prepare a landfill geomembrane quality assurance testing summary which shall consist of the following:
1. For each liner, a separate copy of the Panel Layout Drawing shall be utilized and shall indicate the liner represented.
B. On each sheet, the following information shall be recorded:
1. The location and identification number of each imperfection, the date found and the date repaired.
2. The location, date, sample number and te st result (acceptable/unacceptable) of each destructive test series.
3. The location, identification number and date of each nondestructive air pressure seam test including the length of the tested seam and the result of the test (acceptable/unacceptable).
4. The location, date and lengths of nondestructive vacuum box testing performed on a daily basis.
1180511 02401-4 LLDPE GEOMEMBRANE LINER - QUALITY ASSURANCE TABLE 1. QUALITY ASSURANCE TESTING REQUIREMENTS FOR SEAMING
TEST DESCRIPTION TEST METHOD MINIMUM TEST FREQUENCY ACCEPTANCE CRITERIA
INSTALLATION TESTING
Destructive Tests(1,2)
Peel Strength
ASTM D-4437 or
ASTM D-6392
1 test per 1,000 linear feet(3,4) >91 lb/in and FTB
Shear Strength ASTM D-4437 or
ASTM D-6392
1 test per 1,000 linear feet(3) >120 lb/in
Non-Destructive Tests
Vacuum Box ASTM D-5641 All seams shall be tested by
at least one of these two
methods where appropriate
No imperfections
Air Pressure(5) ASTM D-5820 <2 psi drop
(1) All destructive test results based on Film-Tear Bond (FTB) criteria. All samples which produce seam failures shall be considered unacceptable.
(2) A minimum of one series of destructive tests shall be performed for each machine each day that seaming is performed.
(3) When ambient air temperatures during seaming operations are less than 50 F, testing frequency shall be increased to one test per 500 linear feet.
(4) Peel strength testing shall be performed on both Weld A and Weld B. (5) All hypodermic needle punctures shall be repaired as required by the geomembrane manufacturer.
PART 4 MEASUREMENT AND PAYMENT
4.1 GENERAL
A. Section 01200 - Price and Payment Procedures: Requirements for measurement and payment.
4.2 GEOMEMBRANE LINER – QUALITY ASSURANCE
A. No separate payment will be made for WORK under this Section.
END OF SECTION
11180511 02080 - 1 GEOCOMPOSITE DRAINAGE LAYER
SECTION 02080
GEOCOMPOSITE DRAINAGE LAYER
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Geocomposite of the secondary leachate collection and removal system and in the pore pressure relief system.
B. Performance requirements for geocomposites.
C. Place soil and compact to achieve top of vegetative layer (final) grades.
1.2 REFERENCES
A. Section 01400 - Quality Requirements: Requirements for references.
B. Section 02050 - Liner System
C. Quality Control Testing Standards
1. ASTM D1505 - Standard Test Method for Dens ity of Plastics by the Density-Gradient Technique.
2. ASTM D1603 - Standard Test Method for Carbon Black in Olefin Plastics.
3. ASTM D4218 - Standard Test Method for De termination of Carbon Black Content in Polyethylene Compounds by the Muffle-Furnace Technique.
4. ASTM D4716 - Standard Test Method for Determining the (In Plane) Flow Rate Per Unit Width and Hydraulic Transmissivity of a Geosynthetic Using a Constant Head.
5. ASTM D5035 - Standard Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method).
6. ASTM D5261 - Standard Test Method fo r Measuring Mass Per Unit Area of Geotextiles.
7. ASTM D7179 – Standard Test Method for Determining Geonet Breaking Force.
1.3 QUALITY CONTROL SUBMITTALS
A. Prior to shipping materials, submit certific ation that the geocomposite meets or exceeds the acceptance criteria listed in Table 1. Conformance testing for transmissivity shall be performed in accordance with ASTM D4716. Certification shall include:
1. Test data indicating that the geocomposite under an anticipated load of 15,000 psf will have a transmissivity at least 1.0 gal/min/ft width.
2. Tests shall be performed under a hydraul ic gradient of 0.1 and have a minimum seating period of 100 hours.
11180511 02080 - 2 GEOCOMPOSITE DRAINAGE LAYER
3. Laboratory data and certifications will be provided to the ENGINEER demonstrating conformance with the above test conditions.
1.4 DELIVERY, STORAGE, AND HANDLING
A. The geocomposite shall be transported such that dirt and dust are kept from coming in contact with these materials.
B. The transport of these materials shall be based on manufacturers’ recommendations.
C. At all times these materials s hall be protected from the elements.
D. At no time other than during installation and covering operations shall these materials be exposed to ultraviolet light.
E. These materials, if not stored in a shed, shall be stored upwind of the site.
F. The rolls shall be marked with the manufacturer name and product name.
1.5 ENVIRONMENTAL REQUIREMENTS
A. Geocomposite shall not be placed during adverse weather conditions.
PART 2 PRODUCTS
2.1 MANUFACTURER
A. The following is a list of manufacturers with the capacity to provide a geocomposite that meets the requirements of this section:
1. CETCO Lining Technologies.
2. SKAPS Industries.
B. The above is a short list and may not be the only manufacturers that can provide acceptable materials.
2.2 MATERIALS
A. Geocomposite
1. The geonet core of the geocomposite shall meet the requirements in Table 1.
2. The geotextiles above and below the core s hall meet the requirements of the filtration geotextile as specified in Section 02060 - Geotextiles.
3. The geotextiles above and below the core shall be heat bonded to the geonet core.
TABLE 1. GEOCOMPOSITE REQUIREMENTS
TEST DESCRIPTION TEST METHOD ACCEPTANCE CRITERIA
Raw Material
Carbon Black
ASTM D1603 or D4218 2 to 3%
11180511 02080 - 3 GEOCOMPOSITE DRAINAGE LAYER
TEST DESCRIPTION TEST METHOD ACCEPTANCE CRITERIA
Manufacture Testing
Mass per unit area
Tensile strength
Density
Transmissivity
ASTM D5261
ASTM D5035/7179
ASTM D1505
ASTM D4716
>0.162 lb/ft
2 >45 lb/in
>0.940 g/cc
>1.0 gal/min/ft width
PART 3 EXECUTION
3.1 PROTECTION AND PREPARATION
A. Metal hog rings shall not be used.
B. Overlaps shall not be used.
C. Geocomposite shall not be welded to the geomembrane.
D. The drainage net of the adjacent panels shall be overlapped by a minimum of 6 inches. Non- black plastic ties shall be used at 5-foot intervals in the direction of the roll length and at 2-foot intervals across the end of the panel to tie the drainage net. On slopes, the spacing of ties across the panel end shall be 6 inches. Metallic ties shall not be allowed.
E. The seaming material shall have a contra sting color from that of the geocomposite.
3.2 EXAMINATION
A. CONTRACTOR shall examine the rolls upon delivery to the site. Any damaged or non- specified material shall not be accepted and shall be replaced at the CONTRACTOR’S expense.
B. The material shall be protected from the elements once on site.
C. CONTRACTOR shall verify that the material is free from dust and dirt immediately prior to installation. Washing operations can be implemented at the discretion of the ENGINEER.
D. If requested by the ENGINEER, a sample shall be supplied from site materials for testing to ensure conformance with the project specificatio ns. The sample size and frequency shall be stipulated by the ENGINEER at that time.
E. The geotextiles above and below the geonet in the geocomposite shall be continuously inspected for broken needles remaining from needle-punching operations.
3.3 INSTALLATION
A. The CONTRACTOR shall protect the materials from wind damage. Anchors as recommended by the manufacturer shall be used until such a time when cover soil can be placed.
B. The machine direction of the mate rials shall be placed down the slope.
C. No vehicle shall be allowed to travel directly on the geocomposite.
D. Underlying layers shall not be damaged from installation of these materials.
11180511 02080 - 4 GEOCOMPOSITE DRAINAGE LAYER
E. Geocomposite orientation shall be observed during placement. Strands of one layer shall not penetrate the channels of another layer. The materials shall be laid parallel to the slope.
F. On the landfill floor, exposed geocomposite edges shall be covered with a minimum of 12 inches of filtration geotextile (top and bottom) and sewn or welded to prevent the infiltration of soil. Extend a minimum of 24 inches past the limits of any soil material.
3.4 1.5-FT THICK VEGETATIVE LAYER INSTALLATION
A. Following installation and testing of geocompo site drainage layer, CONTRACTOR shall install 6-inch corrugated HDPE perimeter toe drain and drain rock (as required in Section 02090 - Liner Drainage Material) according to the Contract Drawings.
B. CONTRACTOR shall place CONTRACTOR-furnished soil in 8-inch maximum lifts (6-inch compacted) until top of 1.5-foot thick vegetative layer grades are achieved according to the Contract Drawings.
C. Soil from CONTRACTOR borrow source shall c onform to the product requirements in Section 02040 - Foundation Layer Preparation.
D. CONTRACTOR shall follow all other requirement s for preparation, installation, dewatering, decontamination, and quality control in Section 02040 - Foundation Layer Preparation.
PART 4 MEASUREMENT AND PAYMENT
4.1 GENERAL
A. Section 01200 - Price and Payment Procedures: Requirements for measurement and payment.
4.2 GEOCOMPOSITE DRAINAGE LAYER
A. Schedule of Prices Item No. 15.
B. Measurement Basis: By the square foot meas ured in place by surveying. Excludes seam overlap, waste, etc.
C. Payment Basis: Unit price. Includes furnishing 40-mil LLDPE double-textured geomembrane liner, installing, and testing.
4.3 1.5-FT THICK VEGETATIVE LAYAER
A. Schedule of Prices Items No. 17 and 18.
B. Measurement Basis: By the cubic yard measured in place by surveying.
C. Payment Basis: Unit price. Includes l oading/transporting/placing/compacting CONTRACTOR- furnished soil, and surveying.
END OF SECTION
11180511 SECTION 02090 - 1 LINER DRAINAGE MATERIAL
SECTION 02090
LINER DRAINAGE MATERIAL
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Furnish and Placement of Drainage Material for Liner System Toe Drain.
1.2 REFERENCES
A. Section 01400 - Quality Requirements
B. Section 02050 - Liner System
C. City of Sacramento Standard Specifications
D. United States Environmental Pr otection Agency (USEPA): SW-846 - Test Methods for Evaluating Solid Wastes, Physical/Chemical Methods, Third Edition and Promulgated Updates I-III, November 1986.
1.3 PROGRESS SUBMITTALS
A. Section 01300 - Administrative Requirement s: Requirements for progress submittals.
B. Materials Sources: Submit name of proposed im ported material sources at least 14 days prior to commencing transport of materials to the Site.
1. Submit certified test results for the proposed material which indicate conformance with the requirements in Table 1 of this section.
2. Submit an estimate of the quant ity of material available at the source which meets the liner drainage material specification and is represented by the certified test results.
C. Weigh Tickets: Submit weigh tickets generated at supplier's weigh scale of material delivered to the Site the previous day.
D. Weigh Scale Calibration: Submit no later than 14 days prior to transporting material to the Site a calibration chart, completed within the previous 6 months, for weigh scale. Weigh scale shall be calibrated by the City of Sacramento.
1.4 DELIVERY, STORAGE, AND HANDLING
A. Section 01600 - Product Requirements: Requ irements for transporting, handling, storing, and protecting products.
B. Deliver, handle, and transport materials at all times in a manner and with equipment that will prevent intermixing of aggregate types, segregation, or contamination.
C. Minimize stockpiling requirements. Transport material from source directly to final position where possible.
11180511 SECTION 02090 - 2 LINER DRAINAGE MATERIAL
D. Stockpile material on the Site in locations approved by ENGINEER.
PART 2 PRODUCTS
2.1 GENERAL
A. Liner drainage material shall generally be primar ily gravel sized and shall meet the requirements of Table 1. Material shall be imported from an approved source and composed of clean, graded, hard, durable, uncoated particles obtained from d eposits of gravel, talus rock, quarried rock, or other suitable granular materials. 3. Material shall not be of limestone or dolomitic composition.
B. Free of unsuitable materials including:
1. Frozen material or material containing snow or ice.
2. Trees, stumps, branches, or other wood or lumber.
3. Wire, steel, cast iron, cans, drums, or other foreign material.
4. Materials containing hazardous or toxic cons tituents at hazardous or toxic concentrations.
2.2 SOURCE QUALITY CONTROL
A. Lier drainage material shall conform to the City of Sacramento Standard Specifications for coarse aggregate.
B. Liner drainage material shall meet the following material guidelines, requirements, and performance criteria shown in Table 1.
TABLE 1. MATERIAL GUIDELINES, REQUIREMENTS AND PERFORMANCE CRITERIA
LINER DRAINAGE MATERIAL
LINER DRAINAGE MATERIAL
Material Guidelines:
Gradation (% passing by weight)
No. 4
No. 40
70-100
30-60
Material Requirements:
Gradation (% passing by weight)
1-inch
No. 200
Effective angle of internal friction (degrees)
Carbonate content (% carbonate by weight)
(1)
Magnesium sulfate soundness (% loss by weight)
100
0-5
>35
0-15
0-18
PERFORMANCE CRITERIA LINER DRAINAGE MATERIAL
Maximum lift thickness (inches) 24
Hydraulic conductivity (cm/sec) >1 cm/sec
(1)Testing shall be modified to use a solution with a pH similar to landfill leachate
11180511 SECTION 02090 - 3 LINER DRAINAGE MATERIAL
PART 3 EXECUTION
3.1 PREPARATION
A. Obtain ENGINEER's appro val prior to placing material in on-Site stockpiles.
3.2 STOCKPILING
A. Stockpile in sufficient quantities to meet schedule and requirements.
B. Construct stockpile sites so that they are level, well drained, free of foreign materials, and of adequate bearing capacity to support the weight of materials to be placed thereon.
D. Provide and maintain access to stockpiles.
E. Separate differing materials with substantial dividers or stockpile apart to prevent mixing.
F. Prevent intermixing of aggregate type s or contamination or segregation.
G. Direct surface water away from stockpile site to prevent erosion or deterioration of fill materials.
H. Maintain temporary stockpile slopes not steeper than 2 horizontal to 1 vertical. In no instance shall stockpiles be greater than 15 feet in height above original surrounding grade. Place hay bales or soil erosion and sediment control fencing at the base of and around each temporary stockpile to contain soil that may be washed off the stockpile.
I. Maintain area surrounding stockpiles in a neat and tidy condition.
J. Cover stockpiled fill materials with approved reinforced polyeth ylene sheeting of minimum 6-mil thickness to withstand adverse weather, wind, and other detrimental forces. Provide total protection of stockpiled fill material from rain and other adverse weather effects.
3.3 PLACEMENT
A. Place aggregate base around landfill cover system toe drain according to the Contract Drawings.
3.4 STOCKPILE CLEANUP
A. Remove stockpile, leave area in a clean and neat condition. Grade the Site surface to prevent freestanding surface water.
PART 4 MEASUREMENT AND PAYMENT
4.1 GENERAL
A. Section 01200 - Price and Payment Procedures: Requirements for measurement and payment.
4.2 FURNISH AND PLACE AGGREGATE BASE
A. Schedule of Prices Item No. 16.
11180511 SECTION 02090 - 4 LINER DRAINAGE MATERIAL
B. Payment Basis: Lump Sum. Includes furnishi ng and placement of aggregate for landfill cover system toe drain.
END OF SECTION
11180511 SECTION 02100 - 1 SEEDING AND STORM WATER EROSION CONTROLS SECTION 02100
SEEDING AND STORM WATER EROSION CONTROLS
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Preparation of Subgrade.
B. Hydroseeding.
C. Mulching and Fertilizing.
D. Installation of Erosion Controls Including Fiber Rolls and Erosion Control Blanket.
E. Maintenance for Seed Establishment.
1.2 REFERENCES
A. Section 01400 - Quality Requirements: Requirements for references.
B. ASTM International (ASTM):
1. D244 - Standard Test Methods for Emulsified Asphalts.
2. D2974 - Standard Test Method for Moisture, Ash and Organic Matter of Peat and Other Organic Soils.
3. D4972 - Standard Test Method for pH of Soils.
C. CALTRANS – Standards and Specifications.
D. City of Sacramento Standard Specifications
1.3 DEFINITIONS
A. Weeds: Included but are not limited to, Dande lion, Jimsonweed, Quackgrass, Horsetail, Morning Glory, Rush Grass, Mustard, Lambsquarter, Chickweed, Cress, Crabgrass, Canadian Thistle, Nutgrass, Poison Oak, Blackberry, Tansy Ragwort, Bermuda Grass, Johnson Grass, Poison Ivy, Nut Sedge, Nimble Will, Bindweed, Bent Grass, Wild Garlic, Perennial Sorrel, and Brome Grass.
B. Noxious Weeds:
1. Harmful, undesirable, hard to control.
2. Include but are not limited to the list iden tified in Caltrans Standard Specifications
1.4 SUBMITTALS
A. Seeding and Erosion Control Plan: At least 14 days prior to placing topsoil, submit to ENGINEER for approval CONTRACTOR's Seeding and Erosion Control Plan including, but not limited to, the following:
11180511 SECTION 02100 - 2 SEEDING AND STORM WATER EROSION CONTROLS
1. Seed mixture(s) and fertilizers for the Si te landfill cover system and adjacent areas and application rates.
2. Time of year for planting such mixtures.
3. Methods of preparing seedbed, seeding, sodding, rolling seeded and sodded areas, and irrigation.
4. Methods to provide erosion control until seed is placed and grass is established (i.e., use of any or a combination of emulsifiers, tackifi ers, mulches, adhesives, nurse crop seed, and erosion fiber rolls, control matting or blankets).
B. Seed Certificates: At least 14 days prior to seeding submit to ENGINEER certificates from seed vendors for each seed mixture required, stat ing botanical and common name, percentage by weight and percentages of purity, germination, and weed seed for each species.
C. Submit in accordance with Section 01300.
1.5 REGULATORY REQUIREMENTS
A. Provide to ENGINEER certificate of complian ce from authority having jurisdiction indicating approval of seed mixture.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Section 01600 - Product Requirements: Requi rements for transporting, handling, storing, and protecting products.
B. Deliver grass seed mixture in original sealed containers bearing seed Supplier's label and certificate indicating the content of species, grade, and mass. Seed in damaged packaging will be rejected. Label containers showing:
1. Analysis of seed mixture.
2. Percentage of pure seed.
3. Percentage of weeds.
4. Year of production.
5. Net weight.
6. Date when tagged and location.
7. Percentage germination.
8. Name and address of distributor.
C. Deliver fertilizer in waterproof bags showing weight, chemical analysis, and name of manufacturer.
D. Deliver mulch and erosion control agent in moisture-proof containers showing manufacturer, content, and net weight (air dry).
E. Store materials in accordance with manufac turer's instructions and in a manner to prevent damage or deterioration.
F. Remove from the Site seed which has becom e wet, moldy, or otherwise damaged in transit or storage.
G. Store seed in weatherproof enclosures.
11180511 SECTION 02100 - 3 SEEDING AND STORM WATER EROSION CONTROLS
1.7 ENVIRONMENTAL REQUIREMENTS
A. Section 01500 - Temporary Facilities and C ontrols: Requirements for temporary controls.
B. Do not apply materials over snow, ice, frozen ground, or standing water.
1.8 SEQUENCING AND SCHEDULING
A. Section 01300 - Administrative Requirements: Requirements for coordination.
B. Schedule seeding operations under optimum conditions during normal planting seasons.
C. Coordinate planting with specified maintenance periods to provide maintenance until acceptance by ENGINEER.
D. Seed areas within 10 days of completion of topsoiling.
1.9 QUALITY ASSURANCE
A. Perform work of this Section in accordance with the City of Sacramento Standard Specifications.
B. Provide seed mixture in weatherproof containers showing percentage of seed mix, year of production, net weight, date of packaging, and location of packaging.
1.10 QUALIFICATIONS
A. Seed Producer: Established vendor capable of providing adequate seed quality and quantities.
B. Fertilizer: Established vendor capable of providing adequate fertilizer quality and quantities.
C. Installer: Company specializing in planting and establishment of multiple acre grading and planting projects with 5 years documented experience.
PART 2 PRODUCTS
2.1 SEED MIXTURE
A. CONTRACTOR shall use approved mixes from one of the following Hydroseed Mix Options designated by the CITY.
11180511 SECTION 02100 - 4 SEEDING AND STORM WATER EROSION CONTROLS Hydroseed Mix Option 1 – Erosion Control Mix (Upland)
S E E D M I X
Species Common Name Seeds/lbs Lbs. Pure Live Seed/Acre
Elymus glaucus Blue wild rye 100,000 10
Trifolium wildenovii Tomcat clover 400,000 4
Festuca microstachys Small fescue 300,000 8
Lupinus bicolor Miniature lupine 100,000 3
Eschscholzia californica California poppy 300,000 2
Melica californica California melic 320,000 2
Asclepias speciosa Showy milkweed 120,000 1
Elymus x triticum ReGreen Sterile Hybrid 10,000 20
TOTAL 50
HYDROSEED APPLICATION
Component Application 1
Wood mulch 3,000 lbs/acre
Tackifier 200 lbs/acre
Mycorrhizal Inoculum 60 lbs/acre
BioSol (slow release fertilizer) 1,200 lbs/acre
Hydroseed Mix Option 2 – Wildlife Enhancement Mix
SEED MIX
Species Common Name Seeds/lbs Lbs. Pure Live Seed/Acre
Asclepias fascicularis Narrow-leaf Milkweed 130,000 1
Carex praegracilis Field Sedge 464,000 1
Festuca microstachys Pacific Fescue 300,000 6
Hordeum brachyantherum Meadow Barley 82,000 12
Leymus triticoides Alkali Rye 130,000 4
Sisyrinchium bellum Blue-eyed Grass 380,000 1.5
Trifolium wildenovi Tomcat Clover 400,000 6
TOTAL 31.5
HYDROSEED APPLICATION
Component Application 1
Wood Fiber Mulch 2,000 lbs/acre
Tackifier 100 lbs/acre
AM 120 Mycorrhizal Inoculunm 60 lbs/acre
11180511 SECTION 02100 - 5 SEEDING AND STORM WATER EROSION CONTROLS
2.2 MULCHING MATERIAL
A. Free of weeds and other foreign materials, free of growth or germination inhibiting ingredients; manufactured in such a manner that after addition and agitation in slurry tanks with water, the fibers in the material will become uniformly suspended to form a homogeneous slurry; dyed a suitable color to facilitate inspection of the placement of the material. When applied, capable of forming an absorptive mat, which will allow moisture to percolate into the underlying soil.
B. Straw Mulch: Oat or wheat, free from weeds, foreign matter detrimental to plant life, and dry; seasoned for spreading with mulch blower equipment.
C. Product meeting City of Sacramento Standard Sp ecifications or an ENGINEER approved equal.
2.3 FERTILIZER
A. Material consistent with City of Sacramento Standard Specifications.
2.4 WATER
A. Clean, fresh, and free of any contaminants and substances or matter which could inhibit germination and vigorous growth of grass.
2.5 EROSION CONTROL BLANKET
A. North American Green / Western Green SC150 (or approved equal, refer to Section 01600).
2.6 SOURCE QUALITY CONTROL
A. Section 01400 - Quality Requirements: Requir ements for source testing and analysis of seed mix.
PART 3 EXECUTION
3.1 EXAMINATION
A. Section 01700 - Execution Requirements: Verification of existing conditions before starting work.
B. Verify that prepared soil base is read y to receive work of this Section.
3.2 PREPARATION - SUBGRADE
A. Prepare subgrade to eliminate uneven areas and low spots. Maintain lines, levels, profiles, and contours. Make changes in grade gradual. Blend slopes into level areas.
B. Remove foreign materials, weeds, and undesi rable plants and their roots. Remove contaminated soil.
C. Remove surface debris, roots, vegetation, lumps, and stones in excess of 1 inch.
11180511 SECTION 02100 - 6 SEEDING AND STORM WATER EROSION CONTROLS D. Obtain ENGINEER's approval of s ubgrade preparation before starting seeding.
3.3 INSTALL STORM WATER EROSION CONTROLS
A. Install storm water erosion controls (e.g., fiber rolls) indicated on the Contract Drawings and as required in Section 01500 - Temporary Facilities to comply with the California Stormwater Quality Association Fact Sheets and storm water best management practices (BMPs).
B. Install erosion control blanket on steep slopes of Dellar Encroachment indicated on the Contract Drawings. Install erosion control blanket per manufacturer instructions and specifications.
3.4 HYDROSEEDING
A. Apply seed at a rate consistent with City of Sacramento Standard Specifications.
B. Apply by conventional hydroseed methods.
C. Do not seed areas in excess of that which can be mulched on same day.
D. Do not sow immediately following rain or when ground is too dry.
E. Measure quantities of material by weight or weight-calibrated volume measurement.
3.5 FERTILIZING
A. Apply fertilizer prior to seeding in accordance with City of Sacramento Standard Specifications.
B. Do not apply fertilizer at same time or with same machine used to apply seed.
C. Lightly water to aid the dissipation of fertilizer.
3.6 MULCHING
A. Immediately following seeding, apply mulch to a th ickness of 1/8 inches. Maintain clear of shrubs and trees.
B. Apply water with a fine spray immediately after each area has been mulched.
3.7 OVERLAP
A. Seeding and mulching shall overlap adjoining vegetation by 12 inches.
3.8 CLEANING
A. Section 01700 - Execution Requirements: Requirements for cleaning installed work.
B. Clean up immediately, soil, mulch, broken sod, or other debris spilled onto pavement and dispose of deleterious materials.
C. Take precautions and prevent contamination by seeding and mulching slurry of structures, signs, guardrails, fences, utilities, or other surfaces not specified to be landscaped.
11180511 SECTION 02100 - 7 SEEDING AND STORM WATER EROSION CONTROLS
D. Where contamination occurs, remove seeding slurry to satisfaction of, and by means approved by ENGINEER.
3.9 PROTECTION OF FINISHED WORK
A. Section 01700 - Execution Requirements: Requirements for protecting installed work.
B. Protect landscaped areas from damage.
PART 4 MEASUREMENT AND PAYMENT
4.1 GENERAL
A. Section 01200 - Price and Payment Procedures: Requirements for measurement and payment.
4.2 HYDROSEEDING
A. Schedule of Prices Items No. 19a or 19b.
B. Measurement Basis: By the square foot measured in place and calculated using surveying methods.
C. Payment Basis: Unit price. Includes pr eparing the subgrade, seeding, fertilizing, mulching, watering, and surveying.
4.3 STORM WATER EROSION CONTRO LS – CANNON-SCOLLAN AND DELLAR
ENCROACHMENT
A. Schedule of Prices Items No. 20.
B. Measurement Basis: By the square foot measured in place and calculated using surveying methods.
C. Payment Basis: Unit price. Includes installation of fiber rolls.
4.3 STORM WATER EROSION CONTROLS – DELLAR ENCROACHMENT
A. Schedule of Prices Items No. 21.
B. Measurement Basis: By the square foot measured in place and calculated using surveying methods.
C. Payment Basis: Unit price. Includes installation of erosion control blanket.
END OF SECTION
11180511 SECTION 02110 - 1 FENCING
SECTION 02110
FENCING
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Chain Link Fencing Installation.
1.2 REFERENCES
A. Section 01400 - Quality Requirements: Requirements for references.
B. American Society for Testing and Materials (ASTM):
1. A116 - Standard Specification for Zinc-C oated (Galvanized) Steel Woven Wire Fence Fabric.
2. A153 - Standard Specification for Zinc C oating (Hot-Dip) on Iron and Steel Hardware.
3. A780 - Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings.
4. F567 - Standard Practice for Installation of Chain-Link Fence.
5. F1083 - Standard Specification for Pipe, Steel, Hot-Dipped Zinc-Coated (Galvanized) Welded, for Fence Structures.
C. City of Sacramento Standard Specifications
1.3 DEFINITIONS
A. Fence Post: An upright tubular or fabricat ed steel member for supporting fencing material.
B. Line Posts: Fence posts spaced at regular intervals between terminal posts throughout each stretch of fence.
C. Terminal Posts: Fence posts which in clude end, gate, corner, and straining posts.
D. End Posts: Fence posts positioned at the ends of a stretch of fence.
E. Corner Posts: Fence posts positioned at corners and changes of direction greater than 10 degrees.
F. Straining Posts: Fence posts positioned at changes in grade greater than 30 degrees.
G. Top Rail: Tubular or fabricated steel sect ion continuously joined by means of sleeves or couplings throughout each stretch of fence extending between terminal posts.
H. Brace Rail: Tubular or fabricated steel section used for bracing terminal posts.
I. Diagonal Brace Wire: Wire used for bracing terminal posts.
11180511 SECTION 02110 - 2 FENCING
J. Top Wire: Wire installed at top of fence and extending throughout each stretch of fence between terminal posts.
K. Bottom Wire: Wire installed at bottom of fenc e and extending throughout each stretch of fence between terminal posts.
L. Fittings: Mechanical connections of various designs, shapes, and metals to join fence components into an integral structure.
M. Wire Ties: Wire used to tie chain link fence fabr ic to line posts, bottom wires, and top rails or top wires.
N. Knuckled: Type of selvage obtained by inte rlocking adjacent wire ends, in pairs, and then bending the wire ends back into a closed loop.
O. Barbed: Tye type of selvage obtained by inte rlocking adjacent wire ends, in pairs, and then twisting the wire at least 2 turns with the wire ends above the twist.
1.4 SUBMITTALS
A. Product Data: Include for fabric, posts, accessories, fittings, and hardware.
B. Submit in accordance with Section 01300.
1.5 SYSTEM DESCRIPTION
A. Fence Height: 6 feet nominal as shown on the Contract Drawings.
B. Line Post Spacing: At intervals not exceeding 10 feet.
1.6 QUALITY ASSURANCE
A. Perform WORK of this Section in accor dance with the manufacturer's instructions.
1.7 DELIVERY, STORAGE, AND HANDLING
A. Section 01600 - Product Requirements: Requ irements for transporting, handling, storing, and protecting products.
B. Deliver chain link fence fabric in firmly tied tight rolls.
C. Tag each roll clearly indicating class of coating, specified wire size, mesh size, height of fabric, ASTM A392 and ASTM F668 designation, and manufacturer's name.
D. Store and handle materials in accordance with manufacturer's instructions. In the event of damage, make repairs or replacements approved by ENGINEER.
E. Protect coated surfaces from damage and protec t fencing materials from distortion or bending.
F. Repair damaged zinc-coated surfaces as specified.
11180511 SECTION 02110 - 3 FENCING
1.8 SEQUENCING AND SCHEDULING
A. Section 01300 - Administrative Requirements: Requirements for coordination.
B. Do not commence fence installation until grading WORK is complete and installation will not interfere with other planned WORK in the area.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. 96-inch 9 gauge galvanized 2-inch chain link fabric (product).
2.2 MATERIALS
A. Framing (Steel): Hot rolled steel strip, cold formed to pipe configuration, longitudinally welded construction, minimum yield strength of 50 ksi; coating conforming to ASTM F1043 on pipe exterior and interior.
B. Fabric Wire (Steel): ASTM A116, Galvanized Wire.
C. Concrete: Portland cement, 3,000 psi strength at 28 days, 3-inch slump; 3/4-inch nominal sized coarse aggregate.
2.3 COMPONENTS
A. Line Posts: 2 ½- inch outside diameter.
B. Corner and Terminal Posts: 3-inch outside diameter.
C. Top and Brace Rail: 1 5/8-inch outside di ameter, plain end, top rail sleeve coupled.
D. Fabric: 2-inch diamond mesh interwoven wire, 9 gage, knuckle selvage.
E. Tension Wire: 7 gage coil spring aluminum.
F. Tie Wire: 9 gauge aluminum alloy steel wire.
2.4 ACCESSORIES
A. Caps: Aluminum alloy dome; sized to post diameter, set screw retainer.
B. Fittings: Sleeves, bands, clips, rail ends, tension bars, fasteners and fittings; steel.
2.5 FINISHING
A. Components and Fabric: Galvanized, 2.27 pounds per sq ft coating for top rail, 3.65 pounds per foot for line posts, 5.79 pounds per foot for terminal posts.
B. Accessories: Same finish as components and fabric.
11180511 SECTION 02110 - 4 FENCING
PART 3 EXECUTION
3.1 EXAMINATION
A. Section 01700 - Execution Requirements: Veri fication of existing conditions before starting WORK.
B. Verify that surfaces and the Site conditions are ready to receive WORK.
3.2 PREPARATION
A. Remove debris and correct ground undulations along fence lines to obtain a smooth uniform gradient between posts.
B. Maintain security of the Site during removal of existing fences and installation of new fence and gate(s).
C. CONTRACTOR to maximize salvation efforts of existing fence for reuse.
3.3 INSTALLATION OF FENCING
A. Following the completion of final grading, CONTRACTOR shall re-install new fencing to replace existing fence removed during demolition.
B. Set intermediate and terminal posts plumb in concre te footings with top of footing 2 inches above finish grade. Slope top of concrete for water runoff.
C. Line post footing depth belo w finish grade: 3.5 feet.
D. Corner and terminal post footing depth below finish grade: 3.5 feet.
E. Brace each corner post to adjacent line post with horizontal center brace. Install brace rail 1 bay from end and gate posts.
F. Provide top rail through line post tops and splice with 6-inch long rail sleeves.
G. Do not stretch fabric until concrete foundation has cured 28 days.
H. Stretch fabric between terminal posts or at intervals of 100 feet maximum, whichever is less.
I. Position bottom of fabric 2 inches above finished grade.
J. Fasten fabric to top rail, line posts, braces, and bottom tension wire with tie wire at maximum 15 inches on centers.
K. Attach fabric to end and corner post s with tension bars and tension bar clips.
L. Install bottom tension wire stre tched taut between terminal posts.
M. Install corner posts where change in alignment exceeds 10 degrees horizontally.
N. Strengthening of Existing Fence:
1. Strengthen existing fences by means of supply and installation of additional posts, braces, tension wires, rails, and fabric to restore existing fencing to fully serviceable condition.
11180511 SECTION 02110 - 5 FENCING
2. Following the installation of additional posts, and allowing for 14 days concrete curing time, re-tension existing fence fabric, and add as r equired additional braces, tension wires, and rails.
3. Dispose of surplus fabric.
4. Install additional fabric, if r equired, by weaving 1 fabric wire vertically to connect to existing fences at all connection points.
3.4 TOLERANCES
A. Maximum Variation from Plumb: 1/4 inch.
B. Maximum Offset from True Position: 1 inch.
C. Components shall not infringe adjacent property lines.
3.5 FIELD QUALITY CONTROL
A. Section 01400 - Quality Requirements: Field inspection and testing.
B. Repair damaged galvanized surfaces in accordance with ASTM A780.
C. Apply field repair coating to dam aged galvanized surfaces at dry film thickness at least equal to specified galvanized coating thicknesses.
3.6 CLEANING
A. Section 01700 - Execution Requirements: Requirements for cleaning installed WORK.
B. Spread soil excavated from post holes uniformly within landfill footprint under final cover area.
PART 4 MEASUREMENT AND PAYMENT
4.1 GENERAL
A. Section 01200 - Price and Payment Procedures: Requirements for measurement and payment.
4.2 FENCING RE-INSTALLATION
A. Schedule of Prices Item No. 23.
B. Measurement Basis: By the linear foot measured in place.
C. Payment Basis: Unit price. Includes re-installati on of new fencing, excavation of new post holes, supply and installation of concrete footings.
END OF SECTION
111800 - 1 LANDFILL GAS EXTRACTION
WELLS
SECTION 11180
LANDFILL GAS EXTRACTION WELLS
PART 1 GENERAL
1.1 DESCRIPTION
A. Work Included:
1. The work described in this section consists of furnishing all labor, materials, equip- ment, and appurtenances necessary to drill, install, test, and make ready landfill gas (LFG) extraction wells, including valves, flexible connectors, at the locations shown on the Contract Drawings and specified herein.
B. The well screens, seals, gravel, and soil backfill packs shall be set at depths shown on the Contract Drawings or as designated in the field by the City (Owner) or Engineer. It is expected that combustible gas will be venting from boreholes drilled to install extrac- tion wells. The Contractor’s bid price shall include provision for all equipment and pro- cedures necessary to safely install wells under such conditions.
C. Related Work Described Elsewhere:
1. Section 12221 – Excavation.
2. Section 12225 – Trenching and Backfilling.
3. Section 15100 – Landfill Gas Piping.
4. Section 15200 – Valves and Appurtenances.
D. All work shall be performed by qualified workmen in accordance with the best stand- ards and practices of the trade.
E. The Contractor, at all times, shall keep the premises free from accumulation of waste materials or rubbish caused by their operations. Upon completion of the work, Contrac- tor shall remove all their waste materials and rubbish from the site, as well as all their tools, construction equipment, machinery, and surplus materials, and shall leave the work “Broom Clean.”
1.2 SUBMITTALS
A. Submittals shall be made in accordance with Contract Documents – Submittals Section.
In general, the following data or Shop Drawings shall be submitted to the Engineer for approval two weeks prior to construction:
1. Solid and slotted HDPE pipes.
111800 - 2 LANDFILL GAS EXTRACTION
WELLS
2. Sieve analysis for gravel.
3. Bentonite data.
PART 2 PRODUCTS
2.1 PIPE AND FITTINGS
A. All HDPE pipe and fittings shall conform to the requirements of Section 15100 – Land- fill Gas Piping.
2.2 GRAVEL
A. Gravel used for backfilling annular space around the slotted well casing (LFG extrac- tion well) shall be clean, washed, and well graded in size 1-inch to 3-inch. The gravel shall be composed of clean, hard, and durable fragments or particles, free from dirt, vegetation, or other objectionable matter, and free from an excess of soft, thin elon- gated, laminated or disintegrated pieces.
2.3 BENTONITE
A. The bentonite material shall be granular bentonite and shall be Benseal as manufactured by Baroid Drilling Fluids, Inc. of Houston, Texas, Crumbles 8 Mesh as manufactured by Colloid Environmental Technologies Company (CETCO), Enviroplug No. 8 as man- ufactured by Wyoben, or approved equal.
2.4 VALVES
A. PVC cock valves and gate valves shall conform to the requirements of Section 15200 – Valves and Appurtenances.
2.5 FLEXIBLE CONNECTORS (NOT-IN-CONTRACT)
A. A flexible connector shall be used to connect the wellhead to the wellhead lateral or LFG lateral.
B. The connector shall be of size shown on the Contract Drawings, and shall be U.V. re- sistant reinforced PVC hose manufactured by QED or approved equal. The connector shall also include banding clamps and coils kit as manufactured by QED or approved equal.
C. Flex connector shall be capable of withstanding a vacuum of 29.8 inches of mercury, a pressure of 5 psi, have an operating range of -65 to 3250 F, and provide 50 percent con- traction and 20 percent extension. The connector bend radius shall be, at minimum, 1.5 times the diameter of the hose.
2.6 WELLHEADS (NOT-IN-CONTRACT)
111800 - 3 LANDFILL GAS EXTRACTION
WELLS
A. LFG extraction wells shall be equipped with a 2” diameter fine control valve type multi- functional wellhead manufactured by QED, or approved equal with that is equipped with a 2” orifice plate assembly kit, as shown on the Contract Drawings. Note that City Operators may elect to use different wellheads than those described above. Contractor will be required to construct wells under the Contract, but are not responsible for pro- curing or installing wellheads. See Construction Drawing details for Contractor respon- sibility for materials procurement and installation.
B. The multifunctional wellheads shall be suitable for measuring LFG flow up to 75 scfm and shall incorporate built-in features, and comprise of the following components (City to provide and install wellheads and flexible connectors):
1. Wellhead assemblies shall be provided by Contractor and include a removable quick change orifice plate system, QED Model 40770- Nylon, including 6 orifice plates that meet ASME MFC-3M-2004 (R2017) Design Criteria. Wellheads shall include 0.40", 0.50”, 0.75”, 1.00”, 1.25” and 1.40” orifice plates. City provided wellheads may differ from above.
2. 2" diameter fine-tune vertical control valve (QED Model ORP215), unless deter- mined otherwise by Owner (City).
3. Landfill Gas Well Cap, 6” diameter wells, including 6” flexible coupling and 3”x2” reducing coupling with clamps, 2 built-in access ports with plugs, ¾-inch NPT, QED Model GW622).
4. Brass Hose barb kit, QED Model 40629, that includes (4) 1/4" hose barbs x 1/4" MPT fittings for gas, temperature, and pressure readings. Temperature barb to in- clude 2-1/2" extension nipple.
5. Flex connection tubing shall be Solargard w/ 2.38" ID x 5’ Length with yellow tint and UV inhibitors, QED Model 40947, and include banding kit, QED Model 40979.
6. Gas Header adapter kit shall be QED Model 40676, and include 4"x2" flexible coupling and 2"x12" PVC pipe stub.
7. The wellhead shall be constructed as shown on the Contract Drawings.
2.7 NUTS AND BOLTS
A. For above- and below-ground installation, bolts shall conform to the requirements of ASTM A307-14e1. Unless stated otherwise, all bolts shall be carbon steel, Grade B, heavy hex, hot dip zinc-coated in accordance with the requirements of Class C of ASTM A153/A153M-16a. Nuts shall conform to the requirements of ASTM A563-15.
Nuts shall be Grade A, heavy hex, hot dip zinc-coated in accordance with Class C of
111800 - 4 LANDFILL GAS EXTRACTION
WELLS
ASTM A153/A153M-16a. Washers shall be Grade A, hot dip zinc-coated in accord- ance with Class C of ASTM A153/A153M-16a.
PART 3 EXECUTION
3.1 WELL INSTALLATION
A. General:
1. Materials delivery, storage, and handling:
a. All HDPE blank casing and slotted casing supplied under this Contract shall be shipped, stored, and handled in accordance with the recommendations of the manufacturer.
2. Material Inspection:
a. Prior to well installation, all pipes, fittings, slotted casings, valves, gravel, and bentonite shall be inspected by the Contractor in the presence of the City/Engi- neer for conformance with the standards and specifications. b. All materials not meeting the requirements of the applicable specifications shall be rejected.
B. Borehole Drilling:
1. Prior to drilling, the Contractor shall have a licensed land surveyor stake the loca- tions of the extraction wells as shown on the Drawings and have them approved by the Owner (City) or Engineer. Survey information will include horizontal and ver- tical coordinates. Survey may be conducted by a City licensed land surveyor, sub- ject to approval by the City, upon Contractor request and if so specified in the Con- tract Documents for such allowance. Some wells may be relocated to suit the field conditions. Contractor shall have wells re-surveyed if their locations change.
2. Contractor shall coordinate the start of drilling with the City/Engineer.
3. Provide at all times a thoroughly experienced, competent driller during all opera- tions at the drill site. The driller shall be pre-qualified by the City. The Contractor shall submit to the City/Engineer driller’s qualifications as part of bid submittal.
4. Boreholes shall be of diameter as shown on the Contract Drawings.
5. Drilling shall continue in each borehole to the depths as indicated on the Contract Drawings. The Contractor will not be paid for over-drilling beyond the depths shown on the Contract Drawings, unless authorized in writing by the Owner (City).
111800 - 5 LANDFILL GAS EXTRACTION
WELLS
6. In the event that a borehole must be abandoned, the Contractor shall plug and aban- don the hole from the bottom to within 5 feet of the surface using a mixture of ben- tonite powder and soil (5 pounds of bentonite per cubic foot of soil) and from 5 feet to the surface using a cement grout or graded bentonite plugging material, in a manner approved by the Engineer. The Engineer will determine the need for aban- donment. The Contractor will be paid for the time and materials expended in plug- ging the abandoned borehole at the price quoted in their bid, provided that the abandonment is not due to the Contractor’s negligence, carelessness, or defective equipment.
7. On completion of the drilling operation and before commencement of well casing installation, the Contractor must place a steel safety grate over the borehole as shown on the Contract Drawings. The platform shall be of sufficient size and structural strength to support expected loads during well installation. The safety grate size shall be such that all the edges rest on the undisturbed ground at least 3 feet from the edge of the borehole, which will give workers sufficient time to get away from the borehole in the event of a well-bore cave-in.
8. The CQA staff conducting drilling inspection shall prepare a log for each extraction well during drilling. Well logs shall include the names of the person(s) logging the hole and an as-built description, including a well detail which indicates well depth, extent and type of filter pack, location and depths of bentonite and soil plugs, inter- val of perforations, existing grade elevation, etc.
9. Drilling shall only commence once the location and elevations of any well location have been approved by the Engineer and verified by CQA, driller, and Contractor that they are accurate (based upon licensed land surveyor staked locations)-No ex- ceptions. Adjustments to drilling depth may be required if findings indicate other- wise and will require review and approval by the Owner (City) and/or Engineer.
C. Casing Placement:
1. The blank and slotted casing shall be installed straight and plumb in the center of the borehole at the depths shown on the Contract Drawings. During installation, a cap shall be placed over the top of the casing to prevent introduction of dirt, debris, and prevent LFG venting prior to installation of wellhead assemblies. If the pipe is installed out of plumb, the Contractor shall correct the alignment at their own ex- pense.
D. Gravel Placement:
1. Initial gravel backfilling operations shall be completed while the well casing is sus- pended above the bottom of the hole per the Contract Drawings. The annular space surrounding the slotted well casing shall be filled with specified filter pack of clean gravel backfill to an elevation, above the top of the slotted casing, as indicated on the Contract Drawings.
E. Soil Placement:
111800 - 6 LANDFILL GAS EXTRACTION
WELLS
1. Soil backfill shall be placed at the designated locations along the bore-hole, of thickness as shown on the Contract Drawings.
F. Bentonite Plug Placement:
1. Bentonite plugs shall be placed from the bottom to the top of the plug level and shall be of thickness as shown as shown on the Contract Drawings.
2. Consistency, method of mixing and placement of the bentonite plug shall be sub- mitted to the Engineer for review and approval prior to placing of the bentonite plug. The Contractor will not be allowed to install the bentonite plug prior to writ- ten approval of the consistency, method of mixing, and placement of the plug. No method will be permitted that does not force bentonite plug from the bottom of the plug to the top. The Contractor shall contact the manufacturer for his recommenda- tions regarding method of mixing and placement of bentonite plug. The following is one of the methods that Contractor may adopt for bentonite plug placement:
3. After placing the gravel in the borehole to an elevation of 1 foot above the slotted casing, the Contractor shall place on top of gravel layer, a soil plug of the thickness shown on the Contract Drawings. Prior to placement of the bentonite plug, the Contractor shall thoroughly wet the soil plug. Contractor shall then pour Benseal bentonite and water simultaneously (through a tremie pipe lowered to the bottom elevation of the plug and pulled slowly upwards as bentonite is being poured in the borehole) into the hole in a systematic way to achieve a uniform plug. A minimum of two, 50-lb bags of Benseal will be required to construct 1 foot thick bentonite plug in a borehole of 24-inch di- ameter (Contractor to adjust quantities for larger boreholes). The amount of water necessary to be poured into the borehole will be as recommended by the bentonite manufacturer or by predetermining through experimenting with a small quantity of bentonite the actual amount of water required to achieve a good thick mud consistency mixture. When the bentonite plug has reached the specified thickness, more water shall be poured on top of the plug and ad- equate hydration time will be allowed before any backfilling operation com- mences. A minimum hydration time for bentonite seal shall be 20 minutes or as recommended by the manufacturer.
G. No backfilling operations shall be permitted until the bentonite has hydrated. Hydration time for bentonite plug is a minimum 20 minutes or as recommended by the manufac- turer.
3.2 DISPOSAL OF CUTTINGS
A. The Contractor shall dispose cuttings from the boreholes and other generated refuse off- site at an approved landfill disposal facility.
3.3 CONTROL OF BO REHOLE EMISSION
111800 - 7 LANDFILL GAS EXTRACTION
WELLS
A. It is expected that combustible gas containing trace toxic constituents will vent from boreholes. It shall be Contractor’s sole responsibility to control emissions in such a manner as to safely construct the wells, prevent violation of all applicable air quality regulations, and prevent worker exposure.
END OF SECTION
11310 - 1 CONDENSATE SUMPS AND PUMPING SYSTEMS
SECTION 11310
CONDENSATE SUMPS AND PUMPING SYSTEM
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Provide sump assemblies, pumps, controls, piping and all needed appurtenances as shown on the Construction Drawings.
B. Provide a complete and working conden sate collection and sump pumping system.
1.2 RELATED SECTIONS
A. Section 12221 – Excavating.
B. Section 12225 – Trenching and Backfilling.
C. Section 15100 – Landfill Gas Piping
1.3 SUBMITTALS
A. Submit the following with the Bid:
1. Submit all technical data with the bid to confirm Vendor’s equipment will meet the technical specifications.
B. Submit the following after Notice to Proceed and in accordance with the schedule outlined herein:
1. Complete and submit shop drawings within fifteen (15) days of Contract award.
Indicate equipment, dimens ions, installation and mountin g details, installation instructions, electrical wiring diagrams (as applicable), air and condensate discharge, valves, counters, and other an cillary automatic controls for the sumps and details.
2. Indicate location of tanks, sumps, piping, and any associated valves or regulators.
3. Submit pump and air compressor performance curves showing operating points, head vs. capacity, and efficiencies.
4. Furnish operation and maintenance manuals . Assemble indivi dual pump curves, pump items, pump accessories, bulletins, cut sheets, parts lists and other documentation into three-ring binders labeled to reference the project. 11310 - 2 CONDENSATE SUMPS AND PUMPING SYSTEMS
PART 2 PRODUCTS
2.1 CONDENSATE SUMP VESSEL
A. Sumps shall be dual-contained HDPE pipe and fittings shall be in accordance with Section 15100 – Landfill Gas Piping, of these Technical Specifications.
2.2 CONDENSATE SUMP PUMP
A. Provide submersible, pneum atic pumps, QED AP4B, bottom inlet, short, as manufactured by QED Environmental System s, Ann Arbor, Michigan, or approved equal, with the following performance requirements:
1. Pump shall be designed to transfer landfill gas condensate.
2. The minimum flow rate shall be 3 gallons per minute (gpm).
3. Pump shall overcome a total dynamic head at a minimum flowrate of 180 feet at 125 PSI.
4. The operating range of the pump shall be 2 gpm to 6 gpm.
5. Pump discharge shall be one inch NPT.
B. Pump materials of construction shall be as follows:
1. All metallic pump components in contact w ith the pumped fluid shall be stainless steel.
2. Check valve, check valve housing shall be stainless steel.
C. Pump hoses:
1. Air hose shall be 3/8” ID Goodyear InstaGrip with working pressure at 300 psi and burst pressure at 1,200 psi.
2. Air exhaust hose shall be ½” ID Goodyear InstaGrip with working pressure at 300 psi and burst pressure at 1,200 psi.
3. Fluid discharge hose shall be ¾” ID Goodyear InstaGrip I with working pressure at 300 psi and burst pressure at 1,200 psi.
11310 - 3 CONDENSATE SUMPS AND PUMPING SYSTEMS
D. The condensate sump and pumping system, and all required appur tenances shall be provided by the Contr actor, at Contractor’s expense, as a turn-key unit provided by Real Environmental Products , of Jackson, California, or approved equal vendor.
Successful installation and operation of the condensate sump and pumping system is required prior to payment of this bid item. The Contractor shall submit to the Engineer, a formal Construction Submittal that will be subject to Engineer review and approval prior to procurement-no exceptions.
PART 3 EXECUTION
3.01 INSTALLATION
A. Install all pumps, pump contro ls, valves, and associated piping and appurtenances as shown on the Construction Drawings, in accordance with this section, and the manufacturer’s recommendations.
END OF SECTION
12221 - 1 EXCAVATING
SECTION 12221
EXCAVATING
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Preparation for excavation.
B. Excavation to bury new LFG header pipe in below-grade locations and to place condensate sumps to burial depth, including associated LFG header piping adjacent to sump locations.
C. Refuse excavation, where applicable on Construction Drawings.
1.2 RELATED SECTIONS
A. Section 12225 – Trenching and Backfilling.
1.3 FIELD MEASUREMENTS
A. Verify construction staking for the work is as designed.
1.4 SUBSURFACE CONDITIONS
A. The following reference provides a limited description of the subsurface conditions in the vicinity of the project site:
1. City will provide associated reports, if available, to the CONTRACTOR upon request.
PART 2 PRODUCTS
2.1 AREAS REQUIRING EXCAVATION
A. Trenching for LFG collection piping, condensate lines, air lines, electrical and control wiring, and other miscellaneous components as shown on the Construction Drawings.
B. Condensate sumps. All Condensate Sump locations as shown on the Construction Drawings.
12221 - 2 EXCAVATING
PART 3 EXECUTION
3.1 GENERAL
A. Excavate as necessary to construct improvements in accordance with lines, grades, and dimensions shown and as necessary to accomplish this work.
Excavate to tolerances provided in the following sections.
B. Do not over-excavate without written authorization of the OWNER (City).
3.2 PREPARATION
A. Locate and protect all existing groundwat er monitoring systems, landfill gas monitoring systems, and leachate collection and control systems including buried force mains and electrical supply lines.
B. Perform construction staking to identify required excavation lines, grades and slopes and to provide construction control points. Construction layout and staking shall be performed a licensed land surveyor provided by the City or the CONTRACTOR.
C. Locate, identify, and protect utilities and landfill gas colle ction and control system components (i.e., leachate pumping facilities) from damage.
D. Notify utility company to locate utilities, if applicable. Subsurface utilities are located within and adjacent to the Contract Wo rk Area. CONTRACTOR is responsible to locate and protect existing subsurface utilities. Any damage to such
utilities by the CONTRACTOR shall be replaced at their expense.
E. Provide for implementation and management of all SWPPP mandated BMP’s.
F. Protect benchmarks, existing structures and fences from excavation equipment and vehicular traffic.
3.3 EXCAVATION
A. Excavate as necessary to construct improvements in accordance with the lines, grades, elevations and slopes indicated on Drawings.
B. Stockpile suitable excavated materials for possible use as trench backfill materials, or dispose in
area(s) designated by the OWNER.
C. Tolerances:
1. Line: plus or minus 1.0 feet.
2. Grade: plus or minus 0.5 feet with an average of 0.0 feet. 12221 - 3 EXCAVATING
3.4 REFUSE EXCAVATION
A. Where encountered, excavate existing wa ste to lines grades and dimensions indicated on the drawings and as needed to complete landfill gas collection and control system installation.
B. Load, haul and place excavated refuse below rough grading of the closure area or an alternate location determined by the OWNER. CONTRACTOR shall confirm location of excavated materials with the OWNER, prior to disposal of such materials.
C. Coordinate haul of refuse to the active working face with the OWNER.
D. Unauthorized Excavation:
1. Unauthorized excavation consists of removal of materials beyond indicated subgrade elevations or dimensions as shown on the Construction Drawings.
2. Backfill and compact unauthorized excavations as specified for authorized excavations.
E. Stability of Excavations:
1. Sides of excavations shall be cut back in accordance with 29 CFR 1910 OSHA standards.
2. Shore and brace excavations where slope cut backs are not practical because of space restrictions or stability of the materials being excavated.
3. Maintain sides and slopes of excavations in a safe condition until completion of backfilling.
F. Shoring and Bracing:
1. Provide all labor and materials for shoring and bracing as may be necessary for safety of personnel, protection of work, and compliance with requirements of governmental agencies having jurisdiction.
2. Maintain shoring and bracing in excavations regardless of the time period excavations will be open.
3. Remove shoring and bracing as excavation progresses.
3.5 FIELD QUALITY CONTROL
A. CONTRACTOR shall provide visual inspection of all excavations, including sub-surface utility excavation related activities conducted throughout the Contract Work. Any damage to subsurface utilities or other shall be repaired or replaced by the CONTRACTOR at their own expense.
END OF SECTION
12225 - 1 TRENCHING AND BACKFILLING
SECTION 12225
TRENCHING AND BACKFILLING
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Excavating trenches for utilities including:
1. Landfill Gas Piping, which includes LF G collection pipe, condensate air supply and force main piping, and all other pipi ng associated with the landfill gas collection and control system (GCCS) as shown on the Construction Drawings.
B. Compacted fill from top of utility bedding to subgrade (If encountered within Contract Work Area).
C. Backfilling and compaction.
1.2 RELATED SECTIONS
A. Section 12221 – Excavating.
B. Section 11310 – Condensate Sumps and Pumping System.
C. Section 15100 – Landfill Gas Piping.
1.3 REFERENCES
A. ASTM D1556/D1556M-15e1 - Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-Cone
Method.
B. ASTM D1557-12e1 - Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort [56,000 ft-lbf/ft3 (2,700 kN- m/m3)].
C. ASTM D2216-19 - Standard Test Met hod for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass.
D. ASTM D6938-17a - Standard Test Me thods for Density of Soil and Soil- Aggregate in Place by Nuclear Methods (Shallow Depth).
E. ASTM D2937-17e2 - Standard Test Method for Density of Soil in Place by the Drive-Cylinder Method.
12225 - 2 TRENCHING AND BACKFILLING
F. ASTM D6938-17a - Standard Test Met hod for Water Cont ent of Soil and Rock in Place by Nuclear Methods (Shallow Depth).
G. ASTM D4318-17e1 - Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils.
H. Unified Soil Classification System.
1.4 DEFINITIONS
A. Utility: Any buried pipe, duct, conduit, or cable.
1.5 FIELD MEASUREMENTS
A. Verify that survey bench marks, control points, and intended elevations for the Work are as indicated on the Construction Drawings.
1.6 COORDINATION
A. If applicable, verify work associated with lower elevation utilities is complete before placing higher elevation utilities. Below grade Utilities shall be constructed per City Sta ndard Design requirements and per NEC or CEC, unless otherwise shown on the Construction Drawings.
PART 2 PRODUCTS
2.1 FILL MATERIALS
A. Trenches located in active waste disposal area and areas with intermediate cover:
1. The Contractor shall backfill trenches in waste with cover soils obtained as a result of initial trench excavati on and as detailed on the Contract Drawings.
B. Trenches located in access roads and other areas outside of the limits of waste:
1. The Contractor shall backfill trenches with pipe bedding material and clean soil fill as detailed on the Construction Drawings.
2. Pipe bedding shall be sand clear of organic matter and meeting the following gradation:
U.S. Sieve Size Range of Percent Passing
No. 4 0 to 5
No. 16 0 to 20
No. 50 0 to 50
No. 100 60 to 95
No. 200 95 to 100
12225 - 3 TRENCHING AND BACKFILLING
PART 3 EXECUTION
3.1 PREPARATION
A. Locate and protect all groundwater monitoring sy stems, landfill gas monitoring systems, and leachate collection and control systems including buried force mains and electrical supply lines.
B. Perform construction staking to identify required excavation lines, grades and slopes and to provide construction control points.
C. Locate, identify, and protect utilities and LFG gas collection and control system components (i.e., below-grade forcemain piping, air supply lines) from damage.
D. Notify utility company to locate utilitie s. The Project Site will require the CONTRACTOR to procure a private utility locator to determine locations of subsurface utilities in any area of the Contract Work. Electrical conduits are located within and around
“A” Street, 25th Street road easement locations where
an LFG Header will be constructed for the Work. As such, the CONTRACTOR shall exercise extreme caution when c onstructing this Work Element. Any damage to such utility shall be borne by the CONTRACTOR.
E. Provide for dust control.
F. Protect benchmarks, existing structures and fences from excavation equipment and vehicular traffic.
3.2 SURFACE CONDITIONS
A. Examine the areas and conditions under which work of this Section will be performed. Correct conditions detrimenta l to timely and proper completion of the Work. Do not proceed until unsatisfactory conditions are corrected.
3.3 FINISH ELEVATIONS AND LINES
A. Comply with pertinent provisions of Contract Documents that reference Construction Layout and Surveying.
12225 - 4 TRENCHING AND BACKFILLING
3.4 PROCEDURES
A. Protection of Existing Utilities:
1. Unless shown to be abandoned or removed, protect utility lines and other pipes shown on the Construction Drawings or otherwise made known to the CONTRACTOR prior to excavating. CONTRACTOR is required to perform all utility clearances, including interviewing on-site personnel to inquire about existing utilities in areas of proposed excavations. If a utility is damaged by the CONTRACTOR, the utility shall be repaired or replaced at no additional cost to the OWNER.
2. If utility lines are encountered that are not shown on the Construction Drawings or otherwise made known to the CONTRACTOR, promptly take necessary steps to assure that service is not interrupted.
3. If service is interrupted as a result of work under this Section, ENGINEER shall be notified, and CONTRACTOR shall immediately restore service by repairing the damaged utility.
4. If existing utilities are found to interfere with the facilities being constructed under this Contract, immediately notify ENGINEER and request their instructions. Maintain a minimum 12-inch horizontal and vertical separation from existing utilities and the facilities being constructed under this Contract.
5. Do not proceed with permanent relocation of the work until written instructions are received from the ENGINEER.
6. Exposed utilities shall be properly supported at all times if undermined.
B. Protection of Persons and Property:
1. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, washout, and other hazards created by operations under this Section.
2. Trenches shall be clearly marked if left open overnight. The CONTRACTOR shall supply barricades, warning lights, fencing or other OSHA approved devices to clearly mark and delineate open excavations.
C. Dewatering:
1. Remove all water, including rainwater, encountered during work to an approved location by pumps, drains, and other approved methods. a. Water that contacts waste shall be considered leachate and shall be disposed of at the working face of the landfill, or in the existing leachate management system.
2. Handling and disposal of water shall comply with all stormwater and erosion and sedimentation control permits.
12225 - 5 TRENCHING AND BACKFILLING
D. Dust Emissions:
1. Use means necessary to prevent dust becoming a nuisance to the public, to neighbors and to other work being performed on or near the site. Use of wet sprays is recommended to minimize fugitive dust emissions.
E. Litter Control:
1. CONTRACTOR shall be responsible for ensuring that fugitive litter resulting from construction is collected before the end of each construction day. Use of wet sprays is recommended to minimize fugitive litter.
F. Site Access:
1. Maintain access to adjacent areas at all times.
3.5 TRENCHING
A. Perform trenching of every type of material encountered within the limits of the Work to the lines, grades, and dimensions indicated on the Construction Drawings and specified herein.
B. Satisfactory excavated materials shall be transported to, and placed in stockpiles or fill areas within the limits of the Work as identified by the OWNER.
C. If unsatisfactory materials are encountere d above or at the design depth of the trench, excavate the unsatisfactory materi als to three (3) feet below the design depth and replace with compacted structural fill meeting the requirements of the specifications.
D. Trench in a manner and sequence that will provide proper drainage at all times.
The CONTRACTOR shall provide dewatering equipment if necessary.
E. Dispose of unsatisfactory excavated material, and surplus satisfactory excavated material, away from the work area as shown on Construction Drawings.
F. Waste shall be disposed of at the working face of the landfill.
G. Unauthorized Excavation:
1. Unauthorized excavation consists of removal of materials beyond indicated subgrade elevations or dimensions as shown on the Construction Drawings.
2. Backfill and compact unauthorized excavations as specified for authorized excavations.
12225 - 6 TRENCHING AND BACKFILLING
H. Trenching Safety:
1. Trenching shall be completed in accordance with 29 CFR 1910 OSHA regulations.
2. Trench boxes, shoring and bracing shall be placed in trenches in accordance with 29 CFR 1910 if personnel are to enter the trench or if the trench is susceptible to cave in.
3. Maintain sides and slopes of excavations in a safe condition until completion of backfilling.
I. Shoring and Bracing:
1. Provide all labor and materials for shoring and bracing as may be necessary for safety of personnel, protection of work, and compliance with requirements of governmental agencies having jurisdiction.
2. Maintain shoring and bracing in trenches regardless of the time period excavations will be open.
3. Remove shoring and bracing as trenching progresses.
3.6 BACKFILLING
A. Backfilling shall be completed in accordan ce with the location of the trench as shown on the Construction Drawings.
B. Pipe bedding outside of the limits of waste shall be compacted until no noticeable deformation is observed.
C. Backfill in dual containment areas sha ll be completed in accordance with these Specifications and placed in the areas shown on the Construction Drawings.
D. Conduct air monitoring to confirm lack of surface emissions after completion of backfill. If emissions are detected, re work cover soils and cover system and recomplete air monitoring until passing per the project documents.
E. Backfill trenches to contours and elevations shown on the Construction Drawings or existing conditions as applicable.
F. Systematically backfill in uniform lifts using suitable material. Depth of lift shall be such that its required compaction can be achieved in a reasonable period of time. Moisture content of backfill ma terial shall be within 2% of optimum moisture content as determined by ASTM or through compactive effort methods put forth in Contract Documents. Do not backfill over porous, wet, or spongy subgrade surfaces.
G. Place geotextile separator where indicated on the Construction Drawings.
12225 - 7 TRENCHING AND BACKFILLING
H. Bedding Material: Place and compact be dding materials in equal continuous layers not exceeding 6 inches compacted depth. Compact each lift to a minimum of 90 percent relative compaction as determined by ASTM D1557 or by methods described in Paragraph B (above).
I. Trench Backfill: Place and compact trench backfill in equal continuous layers not exceeding 8 inches compacted depth. Co mpact each lift to a minimum of 90 percent relative co mpaction as determined by ASTM D1557 or by methods described in Paragraph B (above).
J. Employ a placement method that does not disturb or damage utilities in trench.
K. Maintain optimum moisture content of fill materials to attain required compaction density.
L. Remove surplus fill materials from site.
M. Preparation of trench bottom: Set structure directly on a 12-inch minimum thick layer of compacted aggregate base. Mounds or bridging will not be accepted.
Provide adequate room for proper connec tions and maintain correct grade and alignment. Do not lay in a wet trench. If material in bottom of excavation is unsuitable for supporting the structure, excavate below subgrade as directed by OWNER and backfill to required grade w ith aggregate base. Backfill around structures with aggregate base material.
N. Lowering structures into trench: Pr ovide proper implements, tools, and equipment for the safe and efficient ha ndling of materials and execution of the work. Carefully lower all structures, fitt ings, valves, and accessories into the trench using suitable equipment in such manner as to prevent damage.
O. Prevent entrance of trench water, rodents, or foreign material into the structure.
Remove water and place adequate backfi ll to prevent floa ting. Remove and re- install structures which have floated.
3.7 FIELD QUALITY ASSURANCE
A. Top Surface of Backfilling: Plus or minus 1 inch from required elevations.
B. The OWNER or Construction Quality Assurance (CQA) Monitor, Officer, or Engineer will determine optimum mois ture content, maximum density, and plasticity index for
engineered fill materials in accordance with ASTM D1557- 12e1 and ASTM D4318-17e1 or by other means if so directed by the OWNER (City).
C. In-place density and moisture content will be determined by one or more of the following methods:
ASTM D2937-17e2, ASTM D6938-17a, ASTM
D1556/D1556M-15e1, or ASTM D2216-19.
12225 - 8 TRENCHING AND BACKFILLING
D. Cooperate fully with the OWNER in thei r performance of sampling and testing and in-place density and moisture testing.
E. Protect finished Work.
F. Reshape and re-compact fills subjected to vehicular traffic during construction.
During Construction, trenching across main or ot herwise commonly used haul and access roads shall be protected with metal plates per Caltrans Construction Standards during trench excavation so that vehicular traffic may safely pass over the trench area. CONTRACTOR shall coor dinate any road trenching with the OWNER prior to constructing this Work element.
END OF SECTION
15100 - 1 LANDFILL GAS PIPING
SECTION 15100
LANDFILL GAS PIPING
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Furnishing all labor, materi als, equipment, tools, and appurtenances required to complete the installation of the landfill gas collection piping, condensate air supply and force-main piping, and other associated piping.
B. Fabrication of landfill gas condensate sumps.
1.1 RELATED SECTIONS
A. Section 12225 – Trenching and Backfilling.
B. Section 11310 – Condensate Sumps and Pumping System.
1.1 REFERENCES
A. ASTM International.
B. ASTM A536-84 (2019)e1– Standard Specification for Ductile Iron Castings.
1. ASTM D2513-20 – Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings.
2. ASTM D3261-16 – Standard Specification for Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing.
3. ASTM D3350-14– Standard Specification for Polyethylene Plastics Pipe and Fittings Materials.
4. ASTM F1055-16a - Electrofusion Type Polyethylene Fittings.
C. American Society of Mechanical Engineers (ASME).
1. ASME B16.5 – Pipe Flanges and Fl anged Fittings NPS 1/2 through NPS 24 Metric/Inch Standard-Revision of ASME B16.5-1999.
D. American Water Works Association (AWWA).
1. AWWA C207-18 – Steel Pipe Flanges fo r Waterworks Service - Sizes 4 in.
Through 144 in. (100 mm through 3,600 mm).
15100 - 2 LANDFILL GAS PIPING
1.04 DEFINITIONS
A. Landfill gas piping: shall include, but not be limited to header piping, lateral piping, horizontal piping, dripleg piping, landfill gas (LFG) extraction well piping, landfill gas wellhead piping, condensate sump related pi ping, and all other a pplicable piping associated with the landfill gas collection and control system.
1.05 SUBMITTALS
A. HDPE Pipe: Submit manufacturing test spec ification data listing resin type, cell classification, stock densit y, melt flow, flexural modul us, tensile strength, and coloration. Include results of tests with shipment of materials, with 2 additional copies of test results.
1.06 QUALITY CONTROL
A. Source Quality Control: If Manufacturer’s test data is inadequate or unavailable, the OWNER (City) or Engineer reserves right to reject or require additional tests to satisfy material requirements at no additional cost to the OWNER.
B. Comply with appropriate codes and standards of following organizations for handling, fusion, and underground installation of low pressure polyethylene pipe.
1. American Gas Association (AGA).
2. Plastic Pipe Institute (PPI).
3. ASTM.
4. ANSI.
5. ASME.
C. Provide pipe welding personnel that have at least 1 year of experience in the use of the fusion welding procedure specifically in cold weather climates and currently certified as fusion welder.
1.07 DELIVERY, STORAGE, AND HANDLING
A. Store or stack pipe so as to prevent damage from marring, crushing or puncture. Limit maximum stacking height to 6 ft.
B. Store in accordance with manufacturer’s recommendations.
C. Protect pipe from excessive heat or harmful chemicals.
15100 - 3 LANDFILL GAS PIPING
PART 2 PRODUCTS
2.01 POLYETHYLENE (PE) PIPE
A. Provide PE pipe of SDR indicated on the Contract Drawings complying with ASTM D 3350-14. Piping shall conform to either ASTM D 2513-20 or F 714-21 or superseded standard.
B. Physical Properties of HDPE Pipe
1. High Performance, high mole cular weight, high densit y polyethylene pipe (type 3408 resin).
2. ASTM D3350-14, minimum cell classification value 345464C.
3. Standard dimension ratio: See Drawings.
4. Marking: Intervals of 5 ft. or less.
a. Manufacturer’s name or trademark.
b. Nominal pipe size.
c. Type of plastic pipe (i.e., PE3408/PE3608).
d. Standard dimension ratio (i.e., SDR 17) or as specified on the Construction Drawings or within these Technical Specifications.
e. ASTM D2513-20.
f. Extrusion date, period of manufacture or lot, or batch number. g. Provide PE products made from a high density, high modulus resin conforming with cell classification PE 345464C or better in accordance with ASTM D3350-
14. C. Dimensions:
1. Conform to standard dimensions and tolerances of ASTM D2513-20.
2.02 HDPE FITTINGS
A. Provide fittings from polyethylene compound having cell classification equal to or exceeding compound used in pipe to insure compatibility of polyethylene resins.
B. Flange Joints:
1. 150-lb carbon steel or convoluted epoxy co ated ductile iron backup flanges as recommended by manufacturer.
2. Zinc plated carbon steel nuts, bolts, and washers.
3. Neoprene full face flange gaskets.
4. Flanges and bolt patterns consistent with ASME B16.5/AWWA C207-18/ASTM A536-84(2019)e1, as recommended by manufacturer.
15100 - 4 LANDFILL GAS PIPING
C. Dimensions of fittings conforming to standard dimensions and tolerances according to ASTM D3261-16.
D. Provide fittings with pressure rating equal to or greater than pressure rating of pipe.
2.03 HDPE LANDFILL GAS CONDENSATE SUMPS
A. Provide landfill gas condensate sumps as indicated in the Construction Drawings.
1. Each sump assembly shall be fabricated from HDPE pipe and fittings, and include a liquid reservoir section constructed to the size necessary to handle the quantity of condensate expected from the Blower skid at a nominal flow rate of 400 standard cubic feet per minute (SCFM) and designed for vacuum applications up to 35 inches of water column (in.wc). The condensate sump, submersible pneumatic pump, pump discharge hose, ai r supply hose, cont rol system and control connections, including the nece ssary valves and appurtenances as indicated on the Construction Drawings a nd/or specified herein. The sump shall be manufactured as a turn-key unit complete unit with all ancillary devices and be from a reputable manufacturer such as Real Environmental Products, LLC., of Jackson, California or approved equal.
2. The sumps shall collect condensate draining from the landfill gas piping. The sump pumps shall automatically pump based on th e specified installation elevation as shown in the Construction Drawings. A dditional sumps may be required and not necessarily shown on the Construction Dr awings to be able to provide enough pumping head to be able to convey conde nsate to the Site’s existing Condensate Storage Tank.
3. For each sump location, the condensate di scharge piping shall include a check valve; and isolation shut-off ball valves for pump discharge and air supply piping as indicated on the Construction Drawi ngs and set forth in these Technical Specifications.
4. All materials in contact with the landfill gas, the condensate, and landfill environment shall be designed to provide corrosion resistance for the intended service. Hose connections and condensate discharge pi pes to the pumps shall be as recommended by the sump manufacturer for the fluid, vacuum and flows to be conveyed. Hose ends shall be stainless stee l quick connects, to facilitate removal for maintenance.
2.04 POLYVINYL CHLORIDE (PVC) PIPE:
A. Provide Schedule 40 and Schedule 80 PVC pipe complying with ASTM D 1785-15e1.
B. PVC Fittings:
1. Provide Schedule 40 PVC fittings 8 inches and smaller complying with ASTM D 2466-17, socket-type.
15100 - 5 LANDFILL GAS PIPING
2. Provide PVC fittings 10 inches and larger rated for minimum pressure of 80 psig at 73°F and injection molded from Type 1 PVC.
3. Provide Schedule 80 PVC fittings complying with ASTM D 2467-20 for socket-type and ASTM D 2464-15 for threaded-type.
C. PVC Flanges:
1. Provide 150-pound, flat-face, socket-type Schedule 80 PVC flanges. Diameter and drilling of flanges shall comply with ANSI B16.5 for Class 150.
2. Provide full-face, neoprene flange gaskets, 1/16-inch thick with "A" scale hardness of 45 to 60 durometer.
3. Provide correct number and sizes of steel hexagon bolts, washers, and hexagon nuts, electrogalvanized with zinc or cadmium.
D. PVC Solvent Primer: Provide solvent primer as recommended by PVC product supplier and complying with ASTM F 656-15.
E. PVC Solvent Cement: Provide medium-bod ied solvent cement as recommended by PVC product supplier and complying with ASTM D 2564-20.
2.05 CORRUGATED METAL PIPE (CMP) AND STEEL PIPE
A. All corrugated metal pipe to be used for road crossing encasements for the LFG main header or lateral pipe shall be gauge 16 al uminized steel pipe. Schedule 40 Steel pipe may be used for shallow burial locations as shown on the Construction Drawings.
B. Corrugated metal pipe and Schedule 40 Steel pipe shall be sized as shown on the Contract (Construction) Drawings.
PART 3 EXECUTION
3.01 FIELD QUALITY CONTROL
A. Pipe will be rejected for failure to conform to Specifications, or for the following:
1. Fractures or cracks passi ng through pipe wall, except single crack not exceeding 2 inches in length at either end of pipe which could be cut off and discarded. Pipes within one shipment will be rejected if defects exist in more than 5% of shipment or delivery.
B. Pipe will be rejected for cracks sufficient to impair strength, durability, or service- ability of pipe.
15100 - 6 LANDFILL GAS PIPING
1. Defects indicating improper proportioning, mixing, and molding.
2. Damaged ends, where such damage would prevent making satisfactory joint.
C. Acceptance of fittings, stubs, or other specifically fabricated pipe sections will be based on visual inspection at Project site and documentation that they conform to these Specifications.
3.02 INSTALLATION
A. Trench, backfill, and compact in acco rdance with Section 02225-Trenching and Backfilling; and, Construction Drawings.
B. Carefully lower pipes and fittings into trenches.
C. CONTRACTOR to account for seasonal im pacts on HDPE pipe lengths prior to welding and insulation per manufacturer ’s recommendations. For example, for summertime installations provide a slig htly longer length of HDPE pipe when connections are made between two fixed poi nts or structures to compensate for contraction of the pipe in a cooler trench bottom. Provide additional pipe lengths in accordance with the HDPE pipe manufacturer’ s instructions and/or as shown on the Construction Drawings.
D. Install pipe and fittings so that there will be no deviation at the joints and so that inverts present a smooth surface. Pipe and fittings that do not fit together to form a tight fitting joint are not permitted.
E. Install pipes in the locations and to the required lines and grades indicated on the Construction Drawings.
F. Maintain trench excavations that are free of water during the progress of the work. Do not lay pipes in water. Do not weld pipe joints in water.
G. Repair trench cave-ins.
H. Maintain pipe, fittings and pipe interiors in a clean condition throughout installation.
I. Correct and adjust line and grade of pipe by scraping earth foundation or by scraping away or compacting fill under the barrel of the pipe. Do not block or wedge pipe.
J. Wherever the trench has been excavated to a depth in excess of 6 inches below design grade, correct the grade by placing crushed stone or gravel fill.
K. If unsuitable materials or unsuitable conditi ons are encountered in the trench, the OWNER may direct excavation below design grade and placement of gravel or crushed stone foundation to backfill th e trench to design grade. This work will be done by Change Order.
15100 - 7 LANDFILL GAS PIPING
L. Install fittings at locations indicated on the Construction Drawings. Do not install pipe fittings after laying pipe.
M. Do not change the location of trenching pipe laying or pipe sizes without OWNER’s or Engineer’s approval.
N. Install piping to form a completely connected system, including connections to valves and appurtenances specified in other sections.
3.03 HEAT FUSION OF HDPE PIPING:
A. Join HDPE pipe by butt-fusion method, providing a completely uniform and monolithic pipe interior.
B. Join pipe sections at ground level to a length recommende d by the manufacturer such that maximum allowable stress, when pulling the pipe into position alongside the trench, is not exceeded. Use appropriate materials and equipment, as recommended by the HDPE pipe manufacturer, when pulling butt-fused pipe sections alongside the trench to prevent pipe damage.
C. Use detergents and solvent solutions, when required to clean pipe ends. Use in accordance with manufacturer’s recommendations.
D. Do not bend pipe to a radius greater than that recommended by manufacturer for that type and grade of pipe.
E. Do not subject pipe to strains that will overstress or buckle piping or impose excessive stress on joints.
F. Join branch saddle or tee connectio ns in accordance with manufacturer’s recommendations and procedures. Provide branch saddle fusion equipment of the size necessary to properly facilitate saddle fusion within the trench. Tees shall be used for the project, unless specified otherwise.
G. Before butt fusing pipe, inspect each pipe section for presence of dirt, sand, mud, shavings, and other debris or animals. Remove debris and animals from pipe.
H. At end of each working day, cover open ends of fused pipe. Cap to prevent entry by animals or debris.
I. Use compatible fusion techniques when polye thylene pipes of different melt indexes are fused together. Refer to manufacturer’s specifications for compatible fusion.
3.04 FLANGE JOINING
A. Use on HDPE flanged pipe connection sections or Electrofusion couplers as shown on the Construction drawings.
B. Connect slip-on carbon steel backup flanges with nuts and bolts.
15100 - 8 LANDFILL GAS PIPING
C. Butt fuse HDPE fabricated flange adapters to pipe.
D. Take the following precautions when connecting flange joints.
1. Align flanges or flange/valve connections to provide tight seal. Neoprene full face gaskets are required for flange/valve connections.
2. Place U.S. Standard round stainless steel (SS) washers as may be required on some flanges per manufacturer’s recommendations. Lubricate bolts in accordance with manufacturer’s recommendations.
3. Tighten flange bolts in sequence and accordance with manufacturer’s recommendations. CAUTION: Do not over-torque bolts.
4. Tighten bolts in sequence to uniform to rque in accordance with manufacturer’s recommendations.
3.05 PIPE PLACEMENT
A. Provide grade control equipment to accurately install pipe to design grades and slopes.
Slope may not vary by more than 0.1% from the design slope, unless otherwise directed by the OWNER.
B. Maximum lengths of fused pipe to be handled as one section shall be placed according to manufacturer’s recommendations as to pipe size, pipe SDR, and topography so as to not cause excessive gouging or surface abrasion; and, not to exceed 400 ft.
C. Notify OWNER, or their designated representative, prior to installing pipe into trench and allow time for OWNER’S inspection. If the CONTRACTOR installs pipe into the trench before the OWNER has inspected it, the OWNER can require the CONTRACTOR to remove the pipe for inspection without further cost to the OWNER.
D. Correct irregularities found during inspection.
E. Complete tie-ins within trench whenever possible to prevent overstressed connections.
F. Complete HDPE flanged branch saddle connec tions within trench. Butt fused branch saddle only permitted on pipes 18” or greater. No electrofusion branch saddles shall be permitted. All other connectors shall be made using appropriately sized Tees or other fittings as appropriate.
G. Allow pipe sufficient time to adjust to trench temperature prior to any testing, segment tie-ins, or backfilling activity.
H. Install reducers adjacent to laterals or tees.
I. To reduce branch saddle stress, saddles sh all be installed at slope equal to and continuous with lateral or header piping.
15100 - 9 LANDFILL GAS PIPING
J. Place in trench by allowing at least 12 in./100 ft for thermal contraction and expansion.
K. CONTRACTOR must coordinate construction of header lines near access roads with OWNER (City) to limit impediment of normal landfill operations.
3.06 PIPE TESTING
A. Test pipe sections in accordance with Section 01669.
B. Pig all piping sections to clean pipe shav ings prior to placing the LFG piping in operation.
END OF SECTION
15200 - 1 VALVES AND APPURTENANCES
SECTION 15200
VALVES AND APPURTENANCES
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Furnishing all labor, materials, tools, equipment, and performing all work and services necessary for or incidental to installation of all types of valves incorporated in the work, including the items in the schedules i ndicated on the Construction or Contract Drawings and as specified herein.
B. Although such work is not specifically show n or specified, furnishing and installing supplementary or miscellaneous items, appu rtenances and devices incidental to or necessary for sound, secure, complete and compatible installations.
1.1 RELATED SECTIONS
A. Section 12221 – Excavating.
B. Section 12225 – Trenching and Backfilling.
1.1 REFERENCES
A. ASTM D1784-20 – Standard Specification for Rigid Poly Vinyl Chloride (PVC) Compounds and Chlorinated Poly Vinyl Chloride (CPVC) Compounds.
1.1 SUBMITTALS
A. Per Contract Documents Submittal Section.
B. Information contained in submittals must include, but is not necessarily limited to, the following:
1. Valve pressure/temperature rating and flange rating.
2. Valve body material and valve trim.
3. Operator and actuators.
4. Inner lining material, lining pressure and temperature.
5. Indicator attachments.
6. Valve dimensions, weight and class.
7. Maximum non-shock shutoff.
8. Valve flow coefficient Cv.
15200 - 2 VALVES AND APPURTENANCES
1.1 DELIVERY, STORAGE, AND HANDLING
A. Inspect materials thoroughly upon arrival. Examine materials fo r damage. Report damaged material immediately. Secure and pay for replacement material items immediately.
B. Store valves in approved sheltered locations. Ensure site is accessible in all types of weather.
C. Observe manufacturer’s directions regarding storage, ha ndling, and incorporating in Work.
PART 2 PRODUCTS
2.1 GENERAL
A. Provide valves of same manufacturer throughout where possible.
B. Provide valves with manufacturer’s name and pressure rating clearly marked on outside of body.
C. Valves to be same size as pipe in which they are installed unless otherwise indicated on the Construction Drawings.
D. Handle valves, fittings, and other accessories in such manner as to ensure delivery to the point of installation in sound, undamage d condition. Carry, do not drag structures and materials to the point of installation.
E. Provide all valves, except those specified otherwise, with appropriate operator. Ensure direction of rotation to open each valve is from right to left (counter-clockwise).
Furnish valve body or operator with impression cast showing word “OPEN” and arrow indicating open direction.
F. Furnish valves suitable for their intended use.
2.2 VALVES
A. Butterfly Valves:
1. Valve manufacturer and type: ABZ, butterfly type.
2. 6 inch and smaller: Provide lever-operated handle.
8 inch and larger: Provide gear-operated handle.
B. Check Valves
1. Refer to Condensate Sump Specification 11310, for valve manufacturer and type.
15200 - 3 VALVES AND APPURTENANCES
2. Swing check valves: Minimum 150-psi non-shock cold water pressure rating and having an external lever and spring or lever and weight to balance the disc. Furnish with tight-fitting disc with minimum 0.5 psi back pressure. Furnish flanged and suitable for 150 psi working pressure an d for installation as indicated on the Construction or Contract Drawings.
2.03 PIPE SUPPORTS
A. Provide the pipe supports as shown on the Contract (Construction) Drawings, specified, and required to adequately support and secure all piping systems.
1. Provide pipe supports fabric ated from metal framing ch annel and fittings with electrogalvanized zinc or cadmium finis h, as supplied by Unistrut, Superstrut, or Engineer or OWNER approved equal.
2. Provide pipe anchors and guides fabricated from galvanized steel to the dimensions shown in the Contract Drawings. Anc hors should not allow pipe slippage under loading. Provide clearance between guides and the outsid e diameter of the pipes, to allow free sliding.
PART 3 EXECUTION
3.01 INSTALLATION
A. Install valves with stems upright or horizontal, not inverted.
B. Tighten valve flange bolting per manufacturer’s recommendations.
C. Install valves per manufacturer’s recommendations.
3.02 TRENCH EXCAVATION, BEDDING, AND BACKFILL
A. Trench excavation, bedding, and backfill c onforming to the requirements of Section 02225.
3.03 PLACEMENT
A. Place all structures and maintain lines and grades as indicated on the Drawings. Do not deviate from the required line or grade except with permission of the OWNER.
B. Strictly adhere to the installation recomm endations of the equipment or material manufacturers.
C. Also comply with the following requirement s. Provide all special tools and devices such as jacks, chokers, and similar items necessary for the installation.
END OF SECTION
SECTION 00001 - 1 11180511 BID PROPOSAL
CITY OF SACRAMENTO
Department of Public Works
Facilities and Real Property Management
CONTRACTOR NAME:
TO THE HONORABLE CITY COUNCIL
SACRAMENTO, CALIFORNIA:
In compliance with the Contract Documents, the undersigned hereby proposes to furnish all required labor, materials, supervision, transportation, equipment, services, taxes, and incidentals required for:
BID PROPOSAL
CANNON-SCOLLAN LANDFILL CLOSURE (Y13000200)
in the City and County of Sacramento, California.
The Work is to be done in strict conformity with the Contract Documents now on file in the Office of the City Clerk, for the following sum:
Item
No. Item
Estimated
Quantity Unit Unit Price Total
1 Submittals: Permits, HASP, SWPPP, Site Security and
Traffic Plan, Progress Schedules, Monthly Reports, etc.
2 Bonds
3 Insurance
4 Mobilization, Startup, and Te mporary Facilities: mobilize, furnish/install/maintain site security/traffic controls, HASP items, storm water erosion controls, etc.
5 Furnish/install silt fencing/snake barrier
6 Surveying: provide initial, progress, and as-built surveys
7 Demolition: remove existing fencing and dispose off-site
8 Invasive Plant Disturbanbce: excavate roots (45,709
SF, 3 FT high), and relocated within rough grade
9 Rough Grading: relocate/compact waste; and transport/ place/compact soil and grass grubbing (9,485 CY cut;
24,795 CY fill; 15,310 net) from City-furnished, on-site stockpiles
10 Storm Water Infrastructure – Gravity Main: trench;
furnish/install drop inlet, 974 FT of 24-IN RCP, 2
manholes, and headwall; backfill/compact trench
11 2-FT Soil Thick Foundation Layer: transport/place/
compact soil from City-furnished, on-site stockpiles;
compaction testing 90% maximum density
16,255
CY $ $
1 LS $ $
1 LS $ $
1 LS $ $
1 LS
$
$
2,528 LF $ $
1 LS $ $
1,036 LF $ $
5,079
CY
$
$
1 LS
$
$
1 LS
$
$
01100 - 3 11180511 SUMMARY
No. Work Item
8 Invasive Plant Disturbance: excavate roots, relocate within rough grade
9 Rough Grading: relocate/compact waste; and transport/place/compact soil from City-furnished, on-site stockpiles
10 Storm Water Infrastructure – Gravity Main: trench; furnish/install drop inlet, 24-IN RCP, 2 manholes, and headwall; backfill/compact trench
11 2-FT Thick Foundation Layer: transport/place/compact soil from City-furnished, on-site stockpiles; compaction testing 90% maximum density
12 LFG Infrastructure: furnish/install 6 LFG wells (LFG-1 through -6), horizontal vent system, and 3 LFG vent wells (VW-1, -2, and -3)
13 Geotextile Layer: furnish/install 8-oz non-woven geotextile 14 Geomembrane Layer: furnish/install 40-mil LLDPE geomembrane 15 Geomembrane Liner QA: provide panel layout drawing; conduct/document destructive tests (peel & shear strength) and non-destructive tests (vacuum box & air pressure); etc. 16 Drainage Layer: furnish/install geocomposite drain
17 Storm Water Infrastructure – Landfill Drainage: furnish/ install 6-IN corrugated HDPE perimeter toe drain and drain rock; furnish/install 12-IN smooth HDPE culvert and concrete drainage swales 18 1.5-FT Thick Vegetative Layer – Cannon-Scollan: transport/place soil from City-furnished, on-site stockpiles
19 1-FT Thick Vegetative Layer – Dellar Encroachment: Relocate/compact waste, transport/place soil from City-furnished, on-site stockpiles
20 Hydroseeding: furnish/hydroseed landfill cover, Dellar Encroachment, and stockpile areas
21 Storm Water Erosion Controls – Cannon-Scollan and Dellar Encroachment: furnish/install fiber rolls, etc.
22 Storm Water Erosion Controls – Dellar Encroach ment: furnish/install erosion control blanket, etc. 23 Dust Mitigation Measures: water meter/fees, water trucks 24 Furnish/install fencing
25 Closeout, Record Documents, and Demobilization: provide Certification of Completion, warranties, etc., and demobilize
3.5 CITY-SUPPLIED PRODUCTS
A. The following items may be supplied by CITY for incorporation in the WORK:
1. Approximately 55,390 bank cubic yards of clean soil is available for CONTRACTOR to construct the landfill cover system. The soil is located in two areas close to the Site as shown on the Contract Drawings: adjacent to the Site (referred to as the “West Site Stockpiles”), and at the 28 th Street Landfill. Potential bidders will be allowed to view these soil stockpile locations during the pre-bid meeting.
SECTION 02010 - 3 11180511 DEMOLITION AND INVASIVE PLANT REMOVAL
4.2 FENCING REMOVAL
A. Schedule of Prices Item No. 7.
B. Measurement Basis: By the linear f oot measured in place by surveying.
C. Payment Basis: Unit price. Includes material removal, transportation, and off-site recycling/ disposal.
4.3 INVASIVE PLANT DISTURBANCE
A. Schedule of Prices Item No. 8.
B. Measurement Basis: By cubic yard.
C. Payment Basis: Unit Price. Includes excavation and reallocation within rough grade.
END OF SECTION
SECTION 02020 - 2 11180511 WASTE RELOCATION AND
ROUGH GRADING
C. Control the amount of dust resulting from oper ations to avoid creation of a nuisance in the surrounding area.
PART 2 PRODUCTS
2.1 GENERAL
A. CONTRACTOR shall comply with the City of Sacramento Standard Specifications for products.
B. CITY-Furnished Soil. Cover soil provided by t he CITY is shown on the Contract Drawings as Stockpiles 1 through 5. Soil shall be used for achieving rough grade from Stockpile 1 first. After Stockpile 1 has been depleted, then Stockpile 2 shall be used, and so forth.
PART 3 EXECUTION
3.1 WASTE RELOCATION
A. Waste near the edges of future liner anchori ng and perimeter concrete drainage swales must be relocated. The CONTRACTOR shall remove waste within a minimum of 6-feet of edge of liner shown in Contract Drawings. Waste shall be relocated prior to rough grading.
B. Waste relocation is required in the Dellar Encr oachment area to prepare the steep slope for soil cover. Remove visible waste from the steep sl ope of the Dellar Encroachment. Waste removed from the steep slope shall be placed in the northern fill area.
D. Relocated waste shall be placed in lifts not to exceed 8-inch loose (6-inch compacted) in existing low-lying areas of the existing Cannon-Scollan la ndfill footprint. Placement of relocated waste shall not proceed when the soil or subgrade are satu rated or frozen. Special construction efforts may be required to minimize freezing of soils or to dry saturated soils.
E. Compact relocated waste mate rials utilizing a sheepsfoot comp actor. A minimum of 5 passes shall be made over each lift. Areas showing inconsistent degrees of yielding or rutting shall be recompacted as necessary. For the western slope of the Cannon-Scollan area and the steep slope of the Dellar Encroachment area, the CONTRACTOR may use a sheepsfoot roller attached to an excavator arm.
F. All relocated waste shall be covered with inte rmediate cover consisting of 6 mil polyethylene sheeting or 6 inches of soil whenever a given area is to remain open for more than 30 days.
Polyethylene sheeting shall be anchored adequately to form an effective precipitation barrier and withstand anticipated weather conditions. CONT RACTOR shall be responsible for maintenance of sheeting.
G. ENGINEER will approve completion of wast e relocation prior to CONTRACTOR commencing rough grading.
3.2 ROUGH GRADING
A. Load, transport, and place City-furnished soil an d grass grubbing from Stockpiles 1 through 5.
Rough grade to lines and elevations indicated in the Contract Drawings. Uniformly grade areas to smooth surface, free from irregular surface ch anges, to rough grade cross-sections, lines, and elevations indicated in the Contract Drawin gs. Provide smooth transition between existing adjacent grades and new grades. Cut out soft spots, fill low spots, and trim high spots to conform to required surface tolerances.
11180511 SECTION 02081 - 1 VEGETATIVE LAYER PREPARATION SECTION 02 081
VEGETATIVE LAYER PREPARATION
PART 1 GENERAL
1.1 SUMMARY
A. Section Includes:
1. Vegetative layer materials.
2. Place soil and compact to achieve vegetative (cover) layer grades.
3. Provide survey of top of vegetative layer grades
B. Related Sections:
1. Section 02040 – Foundation Layer Preparation.
1.2 REFERENCES
A. ASTM International:
1. ASTM D6913 - Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis.
2. ASTM D7926 - Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis
3. ASTM D1556 - Standard Test Method for Density of Soil in Place by the Sand- Cone Method.
4. ASTM D1557 - Standard Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3 (2,700 kN-m/m3)).
5. ASTM D2167 - Standard Test Method for Density and Unit Weight of Soil in Place by the Rubber Balloon Method.
6. ASTM D2216 - Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass.
7. ASTM D2419 - Standard Test Method for Sand Equivalent Value of Soils and Fine Aggregate.
8. ASTM D2488 - Unified Soil Classification System.
9. ASTM D2922 - Standard Test Method for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).
10. ASTM D3017 - Standard Test Method for Water Content of Soil and Rock in Place by Nuclear Methods (Shallow Depth).
11. ASTM D4318 - Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils.
12. ASTM D6938 – Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth).
1.3 DEFINITION
A. Vegetative (Cover) layer shall be defined as the 1.5-foot-thick layer overlay the geocomposite drainage layer for the Cannon-Scollan site and as the 1-foot-thick layer overlay the geocomposite drainage layer for the Dellar Encroachment site.
1.4 SUBMITTALS
A. Survey demonstrating vegetative (cover) layer grading achieved per Contract drawing 11180511 SECTION 02081 - 2 VEGETATIVE LAYER PREPARATION
1.5 QUALITY ASSURANCE
A. Perform Work in accordance with applicable ASTM Standards.
B. Perform Work in accordance with City of Sacramento Public Work's standard and the State of California requirements.
PART 2 MATERIALS
2.1 REQUIREMENTS FOR TOPSOIL
A. Upper 6-inch-thick soil:
1. Soil pH value shall be between 6.0 and 7.0.
2. Soluble salts shall be less than 500 parts per million (ppm).
3. Soil material shall not contain rocks or lumps greater than 3 inches in maximum dimension.
4. Soil contains less than 40 percent clay but enough fine-grained material (greater than 30 percent silt plus clay) to provide the capacity to hold a moderate amount of moisture.
5. Soil contains sufficient pore space to permit adequate root penetration.
B. Soil shall be placed in lifts 8 inches or less in loose thickness, moisture conditioned (moisture content of the sandy soils at the time of compaction should vary no more than 2% below or above the optimum moisture content) and compacted to a minimum of 85% relative compaction per ASTM D1557.
2.2 MATERIAL FOR LOWER 1-FOOT-THICK VEGETATIVE (COVER) LAYER A. Soil material shall not contain rocks or lumps greater than 3 inches in maximum dimension or organic debris. Imported materials shall have an expansion index of 35 or less. A Registered and Licensed Geotechnical Engineer hired by the CONTRACTOR shall inspect, and test proposed imported materials before they are brought to the site. Backfill shall be placed in lifts 8 inches or less in loose thickness, moisture conditioned (moisture content of the sandy soils at the time of compaction should vary no more than 2% below or above the optimum moisture content and the moisture content of clayey soils at the time of compaction should be 2% to 4% above the optimum moisture content), and compacted to a minimum of 90% relative compaction per ASTM D1557.
B. Please note that lower vegetative cover at the Dellar Encroachment site is 6 inches, instead of 1-foot-thick cover.
PART 3 EXECUTION
3.1 PREPARATION
A. Temporary erosion and sediment controls shall be installed prior to construction of vegetative/cover layer.
B. Identify required lines, levels, contours, and datum. 11180511 SECTION 02081 - 3 VEGETATIVE LAYER PREPARATION
C. Protect utilities indicated to remain from damage.
D. Protect plant life, lawns, and other features remaining as portion of final landscaping.
E. Protect benchmarks, survey control points, fences, sidewalks, paving, and curbs to remain from excavating equipment and vehicular traffic.
3.2 TOLERANCES
A. Maximum allowable variation from design slopes is 0.5 feet horizontal and 0.1 vertical .
3.3 FIELD QUALITY CONTROL
A. CONTRACTOR shall perform field compaction testing for the vegetative (cover) layer in accordance with the requirements as below. CONTRACTOR shall achieve 85% compaction for upper 6-inch-thich layer and 90% for lower 1-foot-thick layer respectively in the field relative to maximum dry density and optimum moisture content determined in the laboratory based on ASTM D1557.
a. One every 2,000 cubic yards of fill.
b. One per lift or every 2-foot vertical thickness of fill. c. One per shift.
B. Perform laboratory compaction tests in accordance with ASTM D1557.
C. Perform in place density and moisture tests in accordance with the following:
1. Density and Moisture Tests: ASTM D6938.
2. Density Test: ASTM D1556.
3. Moisture Test: ASTM D2216.
D. When tests indicate Work does not meet specified requirements, it is required to rework or remove Work, replace, recompact, and retest as directed by the CQA Officer.
E. Quality assurance of dry unit weight and moisture content obtained by Nuclear Gauge Method (ASTM D6938) should be performed using Sand Cone test method (ASTM D1556) and laboratory moisture content test (ASTM D2216). The total number of quality assurance test should be at least 20% of the total number tests performed to determine relative compaction and moisture content of the compacted soil.
PART 4 MEASUREMENT AND PAYMENT
A. Schedule of Prices Item No. 18 covers the 1.5-foot-thick vegetative layer at Cannon- Scollan and Item No. 19 covers the 1-foot-thick vegetative layer at Dellar Encroachment.
B. Measurement Basis: By the cubic yard measured in place by surveying.
C. Payment Basis: Unit price. Includes loading/transporting/placing/compacting CITY- furnished soil, and surveying.
END OF DOCUMENT
02100 - 1 LFG GAS PROBES
SECTION 02100
LFG GAS PROBES
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Drilling and Installation of Soil Gas Probe.
1.2 REFERENCES
A. American Society for Testing and Materials (ASTM):
1. D1785-15e1 - Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120.
1.3 SYSTEM DESCRIPTION
A. Soil gas probe with the following characteristics:
1. Probes: Up to two (2) ½-inch diameter (shallow and deep zones probes) with ¼- inch diameter labcocks. Probe completions (e.g., number of probes) dependent on findings during initial probe borings.
2. Probe Piping: ½-inch diamet er, Schedule 80 PVC, with 0.020 slotting flush treaded socket.
3. Borehole: Borehole shall be 8-inches in di ameter. Annular space shall include all materials identified on the LFG Probe Detail shown on the Contract Drawings and presented in the approved probe construction permit.
1.4 PROGRESS AND CONSTRUCTION SUBMITTALS
A. Product Data: Submit data and cut sheets for piping, bentonite, and 3/8” Pea Gravel used in construction of the gas probe via formal Contractor Submittal (If required by the City), if included in the Contract Work.
B. Samples: Should the source of any materials to be used downhole change, submit a sample of new material for analysis; such submissions shall be in addition to any submission required to be submitted to other authorities having jurisdiction.
C. Evidence of Qualifications: Contractor and their Drilling Firm shall submit proof of state license to perform this work. Contractor shall have a Haz A contractor’s license and the driller shall have a C-57 Driller’s license.
D. Manufacturer's Instructions: All materials used in performance of the work shall be constructed and installed per material manufacturer’s recommendations. This includes but is not limited to, PVC solvent cementing products, mechanical joining and bentonite hydration.
02100 - 2 LFG GAS PROBES
1.5 CLOSEOUT SUBMITTALS
A. Record Documents: Accurately record actual locations of soil gas probes, depth, subsoil strata, and drilling difficulties encountered. Submit signed copy of driller's logbook statements.
1.6 QUALITY ASSURANCE
A. Because of the nature of the ac tivities which have taken place at the S ite, the soil gas probes may penetrate potentially contaminated soil. Take necessary precautionary measures to prevent contamination near the ground surface from being carried downhole. This is accomplished by placing polyethylene plastic sheeting and plywood around the annular perimeter of the gas probe’s borehole prior to depositing drill spoils. At the cessation of drilling, Contractor shall place all spoils in approved steel drums to be characterized and sent out for disposal by proper means.
B. Procure permits, certificates, and licenses required by law for the execution of the Work. Request and obtain waivers from the authorities having jurisdiction and submit to ENGINEER prior to the commencement of work at the Site. Comply with federal, state, and local Laws and Regulations relating to the performance of the Work.
1.7 QUALIFICATIONS
A. Manufacturer: Company specializing in manufacturing products specified in this Section having a minimum of 5 years of experience manufacturing such materials.
B. Drilling Firm: Company specializing in performing the work of this Section that has a State of California C-57 drilling license and employed by CONTRACTOR. Driller shall have a minimum of 5 years’ experience in installation and abandonment of environmental wells (soil gas probes).
1.8 ENVIRONMENTAL REQUIREMENTS
A. Shut off and seal a hole should flowing artesian water or gas be encountered.
B. Take necessary precautions to ensu re subsurface soils and water which could impact the integrity of the Site are not released.
C. Remediate any release of potentially contaminat ed material (via removal, containerization, characterization, and proper disposal) and restore the area to preconstruction conditions using clean imported materials.
1.9 SEQUENCING AND SCHEDULING
A. Sequence and schedule the work subject to the following conditions:
1. ENGINEER will determine location and sequence of drilling events. Refer to Contract Drawing showing Probe locational information.
2. Strictly enforce equipment cleaning.
3. Complete drilling and installation activities at each soil gas probe in its entirety, except where surface casing is to set for a minimum of 24 hours, before moving to a subsequent soil gas probe.
02100 - 3 LFG GAS PROBES
PART 2 PRODUCTS
2.1 RISER
A. ASTM D1785-15e1 Schedule 80, PVC, ½- inch ID, threaded and flush coupled.
2.2 PERFORATED PVC SCREEN
A. ASTM D1785-15e1 Schedule 80, PVC, ½- inch ID; 5-foot screen minimum length and 0.020 slotted openings, threaded and flush coupled joints. Length of screened section may increase and shall be constructed as shown on the Contract Drawings.
2.3 FILTER MEDIA
A. 3/8” Pea Gravel, clean.
2.4 CONCRETE
A. ASTM C39/C39M-21.
B. Pre-mix concrete mixed to manufacturer's recommendations with potable water.
C. Compressive Strength: Minimum 3,000 psi at 28 days.
2.5 BENTONITE CHIPS
A. Chipped sodium montmorillonite furnished in sacks or buckets, free of impurities, from a commercial source. Enviroplug #16, or approved equal, shall be used at locations shown on the Contract Drawing Probe Detail.
B. Diameter: Less than 1/5 the width of the annular space into which they are placed.
2.6 WATER
A. When used in equipment decontamination, drilling, and soil gas probe construction including cleaning, grouting, or other activities, water shall be cl ean, potable, and obtained from a source supplied by CONTRACTOR.
2.7 DRUMS
A. DOT-approved 55 US gallon steel drums attached with steel lid.
2.8 POLYETHYLENE SHEETING
A. Continuous sheeting of minimum 6-mil thickness fabricated from a single ply of construction grade high-density polyethylene plastic.
02100 - 4 LFG GAS PROBES
2.9 OTHER MATERIALS
A. Selected by CONTRACTOR for the purpose intended and subject to ENGINEER's approval prior to use.
PART 3 EXECUTION
3.1 EXAMINATION
A. Verify that the Site conditions will s upport equipment for performing drilling operations.
B. Do not commence drilling operations until ENGINEER has located and marked the location of each gas probe; proceed with installation of probes only upon receipt of written instructions from ENGINEER.
C. Obtain ENGINEER's approval for any material introduced into borehole.
3.2 PREPARATION
A. Protect structures near soil gas probe from damage.
B. Prior to commencing drilling at each probe location, protect surface soil in the immediate area of drill rig with 2 layers of polyethylene sheeting covered by 5/8-inch plywood.
1. Minimum Area to be Covered: Approximately 12 feet by 16 feet; contain drill cuttings on top of the plywood prior to transfer to drums.
C. Equipment Cleaning:
1. Upon mobilization to the Site and prior to commencing drilling, take drill rig and associated equipment to designated on-Site Equipment Dec ontamination Facility and thoroughly clean with a high-pressure, low-volume, hot water wash to remove mud and other foreign matter; ensure drill rig and associated equipment are free of mud and hydr aulic fluid, seals and ga skets are intact, and no fluids are leaking. Remove loose paint or encrustation from downhole equipment prior to use; remove by sandblasting prior to m obilization to the Site. This requi rement may be waived by the City at their discretion.
2. Take downhole equipment used in the completion of soil borings and installation of probe to the designated on-Site Equipment Decontamination Facility and clean as specified herein prior to commencing each borehole to prevent cross-contamination from the previous drilling location.
3. Clean drill rig prior to mob ilizing to each probe location.
D. Methods of Cleaning:
1. Clean downhole drilling equipment such as push rods, drill steel, and associated equipment and tools that will contact potentially contaminated soil with clean, hot water under high pressure using the following wash sequence:
1. Wash and wipe dry.
2. Rinse.
02100 - 5 LFG GAS PROBES
2. Clean riser and screens thoroughly using the following wash sequence:
1. Wash equipment thoroughly with a detergent (Alconox) high-pressure wash to remove particulate matter or surface film (if any).
2. Rinse with potable water.
3. Protect from contact with debris, until required.
3.3 DRILLING AND INSTALLATION
A. Use drilling equipment and me thods approved by ENGINEER.
B. Construct each soil gas probe in accordance with the details as shown on the Contract Drawings and as directed by ENGINEER.
C. Maintain soil gas probe opening and casing free of contaminating materials.
D. Advance push rods to ensure a minimum 3 ¼-inch diameter borehole. Advance borehole to elevation shown on the Contract Drawings. Obtain split-spoon samples at 5-foot intervals.
E. If auger refusal is encountered, ENGINEER or their authorized CQA Representative will mark the relocation of the soil gas probe.
F. Attach perforated PVC screen, complete with bottom plug, to the soil gas probe riser pipe by threaded flush joint couplers and lower to desired screened interval specified by ENGINEER and shown in the Contract Drawings. Take precautions to prevent damage to threaded joints during installation.
G. Extend the riser pipe a minimum of 4 feet above grade temporarily to deter entrance of foreign materials during soil gas probe completion.
H. Place suitably graded 3/8” Pea Gravel in annulus between riser (probe) pipe(s ) and borehole by using a decontaminated, flush-threaded, 3/4-inch diameter tremie pipe to a height of 1 vertical foot above top of screen.
I. Install a bentonite chip seal to a vertical height specified on the Contract Drawings above the 3/8” Pea Gravel using a 3/4-inch tremie pipe to ensure that a good seal is formed. Lower the tremie pipe to the top of the Sand layer and slowly raise tremie pipe as the bentonite chips fill the annular space.
J. Add potable water and allow sufficient time for bentonite seal to hydrate prior to grouting the remaining annulus. Time required for proper bentonite seal shall be adhered to and follow product manufacturer’s recommendations.
K. Fill the remainder of borehole with materials shown on the LFG probe detail in the Contract Drawings using an approved method until the top of the gas probe casing reaches existing or finished grade surface.
Place grout in one continuous operation with entire amount placed before initial set occurs. Remove uppermost 0.5 feet of bentonite gr out and replace with cement-bentonite grout. Backfilling and materials used in probe construction shall follow the Construction Drawings should they differ from the above.
L. Perforated PVC Screens:
1. Clean screens prior to installation to remove shavings and PVC material if slotting has visible remnants.
2. Install screens by methods approved by ENGINEER and in accordance with manufacturer's recommendations.
02100 - 6 LFG GAS PROBES
M. Riser Pipe:
1. Clean riser pipe and fittings prior to installation to remove deleterious materials, if present.
2. Install riser pipe to sizes and depths show n on the Drawings and in locations designated by ENGINEER. Provide a nominal riser pipe stickup above ground of 4 feet for each soil gas probe.
3. Maintain accurate records of rise r pipe lengths and sizes installed.
3.4 SOIL GAS PROBE ABANDONMENT
A. In the event of probe abandonmen t because of loss of tools or e quipment, or due to CONTRACTOR negligence, if requested and as directed by ENGI NEER, fill the abandoned hole with bentonite chips and bentonite grout; if directed by ENGINEER, salvage and remove such casing as can be salvaged. Probe abandonments shall be constructed as shown on the approved LFG Probe Destruction/Abandonment Permit.
B. Abandonment of a borehole due to refusal and not due to CONTRACTOR equipment loss, equipment failure, or negligence, which is beyond the CONTRACTOR's control, will be reimbursed at the appropriate Contract rates.
3.5 WASTE HANDLING
A. Collect cuttings and solid waste generated during equipment cleaning and probe cons truction, and place in drums.
B. Collect liquid wastes generated during equipment clean ing, probe construction, and transfer to wastewater storage drums.
3.6 PROTECTION OF FINISHED WORK
A. Protect completed soil gas (LFG) probes under construction from contamination.
PART 4 MEASUREMENT AND PAYMENT
4.1 GENERAL
A. See requirements for measurement and payment in City Bid Documents for the Contract Work.
4.2 SOIL GAS PROBE
A. Schedule of Prices Item number shown on City Bid Documents for the Contract Work.
B. Payment Basis: Lump Sum. Includes drilling and installation of soil gas probe.
02100 - 7 LFG GAS PROBES
4.3 LOSS OF TOOLS OR EQUIPMENT
A. In the event of loss of tools or equipment during any phase of constructing a soil gas probe or soil boring, no additional payment for lost equipment or time spent or expense incurred in an attempt to recover tools or equipment prior to possible abandonment of a soil gas probe will be made.
END OF SECTION
02221- 1 EXCAVATING
SECTION 02221
EXCAVATING
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Preparation for excavation.
B. Excavation to bury new LFG header and lateral pipe in below-grade locations (if applicable), including associated LFG header piping adjacent to existing sump locations.
C. Refuse excavation, where applicable on Construction Drawings.
1.2 RELATED SECTIONS
A. Section 02225 – Trenching and Backfilling.
1.3 FIELD MEASUREMENTS
A. Verify construction staking for the work is as designed.
1.4 SUBSURFACE CONDITIONS
A. The following reference provides a limited description of the subsurface conditions in the vicinity of the project site:
1. City will provide associated reports, if available, to the CONTRACTOR upon request.
PART 2 PRODUCTS
2.1 AREAS REQUIRING EXCAVATION
A. Trenching for LFG collection piping, if applicable, and other miscellaneous components as shown on the Construction Drawings.
PART 3 EXECUTION
3.1 GENERAL
A. Excavate as necessary to construct improvements in accordance with lines, grades, and dimensions shown and as necessary to accomplish this work. Excavate to tolerances provided in the following sections.
02221-2 EXCAVATING
B. Do not over-excavate without written authorization of the OWNER (City).
3.2 PREPARATION
A. Locate and protect all existing groundwater monitoring systems, landfill gas monitoring systems, and leachate collection and control systems including buried force mains and electrical supply lines.
B. Perform construction staking to identify required excavation lines, grades and slopes and to provide construction control points. Construction layout and staking shall be performed a licensed land surveyor provided by the City or the CONTRACTOR.
C. Locate, identify, and protect utilities and landfill gas collection and control system components (i.e., leachate pumping facilities) from damage.
D. Notify utility company to locate utilities, if applicable. Subsurface utilities are located within and adjacent to the Contract Work Area. CONTRACTOR is responsible to locate and protect existing subsurface utilities. Any damage to such utilities by the CONTRACTOR shall be replaced at their expense.
E. Provide for implementation and management of all SWPPP mandated BMP’s.
F. Protect benchmarks, existing structures and fences from excavation equipment and vehicular traffic.
3.3 EXCAVATION
A. Excavate as necessary to construct improvements in accordance with the lines, grades, elevations and slopes indicated on Drawings.
B. Stockpile suitable excavated materials for possible use as trench backfill materials, or dispose in area(s) designated by the OWNER.
C. Tolerances.
1. Line: plus or minus 1.0 feet.
2. Grade: plus or minus 0.5 feet with an average of 0.0 feet.
3.4 REFUSE EXCAVATION
A. Where encountered, excavate exis ting waste to lines grades and dimensions indicated on the drawings and as needed to complete landfill gas collection and control system installation.
B. Load, haul and place excavated refuse below rough grading of the closure area or an alternate location determined by the OWNER. CONTRACTOR shall confirm location of excavated materials with the OWNER, prior to disposal of such materials.
C. Coordinate haul of refuse to the active working face with the OWNER.
02221-3 EXCAVATING
D. Unauthorized Excavation:
1. Unauthorized excavation consists of removal of materials beyond indicated subgrade elevations or dimensions as shown on the Construction Drawings.
2. Backfill and compact unauthorized excavations as specified for authorized excavations.
E. Stability of Excavations:
1. Sides of excavations shall be cut back in accordance with 29 CFR 1910 OSHA standards.
2. Shore and brace excavations where slope cut backs are not practical because of space restrictions or stability of the materials being excavated.
3. Maintain sides and slopes of excavations in a safe condition until completion of backfilling.
F. Shoring and Bracing:
1. Provide all labor and materials for shoring and bracing as may be necessary for safety of personnel, protection of work, and compliance with requirements of governmental agencies having jurisdiction.
2. Maintain shoring and bracing in excavations regardless of the time period excavations will be open.
3. Remove shoring and bracing as excavation progresses.
3.5 FIELD QUALITY CONTROL
A. CONTRACTOR shall provide visual inspection of all excavations, including sub-surface utility excavation related activities conducted throughout the Contract Work. Any damage to subsurface utilities or other shall be repaired or replaced by the CONTRACTOR at their own expense.
END OF SECTION
02225-1 TRENCHING AND BACKFILLING
SECTION 02225
TRENCHING AND BACKFILLING
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Excavating trenches for utilities including:
1. Landfill Gas Piping, which includes LFG collection pipe; and, condensate air supply and force main piping (if applicable), and all other piping associated with the landfill gas collection and control system (GCCS) as shown on the Construction Drawings.
B. Compacted fill from top of utility bedding to subgrade (If encountered within Contract Work Area).
C. Backfilling and compaction.
1.2 RELATED SECTIONS
A. Section 02221 – Excavating.
B. Section 15100 – Landfill Gas Piping.
1.3 REFERENCES
A. ASTM D1556/D1556M-15e1 - Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-Cone Method.
B. ASTM D1557-12e1 - Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort [56,000 ft-lbf/ft3 (2,700 kN-m/m3)].
C. ASTM D2216-19 - Standard Test Method for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass.
D. ASTM D6938-17a - Standard Test Methods for De nsity of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).
E. ASTM D2937-17e2 - Standard Test Method for Density of Soil in Place by the Drive-Cylinder Method.
F. ASTM D6938-17a - Standard Test Method for Water Content of Soil and Rock in Place by Nuclear Methods (Shallow Depth).
G. ASTM D4318-17e1 - Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils.
H. Unified Soil Classification System.
1.4 DEFINITIONS
A. Utility: Any buried pipe, duct, conduit, or cable.
02225-2 TRENCHING AND BACKFILLING
1.5 FIELD MEASUREMENTS
A. Verify that survey bench marks, control points, and intended elevations for the Work are as indicated on the Construction Drawings.
1.6 COORDINATION
A. If applicable, verify work associ ated with lower elevation utilities is complete before placing higher elevation utilities. Below grade Utilities shall be constructed per City Standard Design requirements and per NEC or CEC, unless otherwise shown on the Construction Drawings.
PART 2 PRODUCTS
2.1 FILL MATERIALS
A. Trenches located in existing waste disposal area and areas with intermediate cover:
i. The Contractor shall backfill trenches in waste with cover soils obtained as a result of initial trench excavation and as detailed on the Contract Drawings.
B. Trenches located in access roads and other areas outside of the limits of waste:
i. The Contractor shall backfill trenches with pipe bedding material and clean soil fill as detailed on the Construction Drawings.
ii. Pipe bedding shall be sand clear of organic matter and meeting the following gradation:
U.S. Sieve Size Range of Percent Passi ng
No. 4 0 to 5
No. 16 0 to 20
No. 50 0 to 50
No. 100 60 to 95
No. 200 95 to 100
PART 3 EXECUTION
3.1 PREPARATION
A. Locate and pro tect all groundwater monitoring sy stems, landfill gas monitorin g systems, and leachate collection and control systems including buried force mains and electrical supply lines.
B. Perform construction staking to identify required excavation lines, grades and slopes and to provide construction control points.
C. Locate, identify, and protect utilities and LFG gas collection and control sy stem components (i.e., below-grade force main piping, air supply lines) from damage.
D. Notify u tility comp any to locate utilities. The Project Site will require the CONTRACTOR to procure a private utility locator to determin e locations of subsurface u tilities in any area of the Contract Work. Electrical cond uits are lo cated within and aroun d “A” Street, 25 th Street road easement locations. As such, the
02225-3 TRENCHING AND BACKFILLING
CONTRACTOR shall exercise extreme caution when constructing this Work Element. Any damage to such utility shall be borne by the CONTRACTOR.
E. Provide for dust control.
F. Protect benchmarks, existing structures and fences from excavation equipment and vehicular traffic.
3.2 SURFACE CONDITIONS
A. Examine the areas and conditions under which work of this Section will be performed. Correct co
nditions detrimental to timely and proper completion of the Work. Do not proceed un til u
nsatisfactory conditions are corrected.
3.3 FINISH ELEVATIONS AND LINES
A. Comply with pertinent provisions of Contract Documents that reference Construction Layout an d Surveying.
3.4 PROCEDURES
A. Protection of Existing Utilities:
1. Un
less shown to be abandoned or removed, protect utility lines and other pipes shown on the C
onstruction Drawings or otherwise made known to the CONTRACTOR prior to excavating.
CONTR
ACTOR is required to perform all utility clearances, including interviewing on-site p
ersonnel to inquire about existing utilities in areas of proposed excavations. If a utility is dam
aged by the CONTRACTOR, the utility shall be repaired or replaced at no additional cost to th
e OWNER.
2. If
utility lines are encountered that are not shown on the Construction Drawings or otherwise made known to the CONTRACTOR, promptly take necessary steps to assure that service is not in
terrupted.
3. If serv
ice is interrupted as a result of work under this Section, ENGINEER shall be notified, and CONTRACTOR shall immediately restore service by repairing the damaged utility.
4. If existing utilities are found to interfere with the facilities being constructed under this Contract, i
mmediately notify ENGINEER and request their instructions. Maintain a minimum 12-inch h
orizontal and vertical separation from existing utilities and the facilities being constructed under th
is Contract.
5. Do no
t proceed with permanent relocation of the work until written instructions are received from the ENGINEER.
6. Exposed utilities shall be properly supported at all times if undermined.
B. Protection of Persons and Property:
1. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, washout, and other hazards created by operations under this Section.
2. Trenc
hes shall be clearly marked if left open overnight. The CONTRACTOR shall supply bar
ricades, warning lights, fencing or other OSHA approved devices to clearly mark and delineate ope
n excavations.
C. Dewatering:
02225-4 TRENCHING AND BACKFILLING
1. Remove all water, including rainwater, encountered during work to an approved location by pumps, drains, and other approved methods.
a. Water that contacts waste shall be considered leachate and shall be disposed of at the working face of the landfill, or in the existing leachate management system.
2. Handling and disposal of water shall comply with all stormwater and erosion and sedimentation control permits.
D. Dust Emissions:
1. Use means necessary to prevent dust becoming a nuisance to the public, to neighbors and to other work being performed on or near the site. Use of wet sprays is recommended to minimize fugitive dust emissions.
E. Litter Control:
1. CONTRACTOR shall be responsible for ensuring that fugitive litter resulting from construction is collected before the end of each construction day. Use of wet sprays is recommended to minimize fugitive litter.
F. Site Access:
1. Maintain access to adjacent areas at all times.
3.5 TRENCHING (IF APPLICABLE)
A. Perform trenching of every type of material encoun tered within the limits of the Work to the lines, grades, and dimensions indicated on the Construction Drawings and specified herein.
B. Satisfactory excavated materials shall be transporte d to, and placed in stockpiles or fill ar eas within the limits of the Work as identified by the OWNER.
C. If unsatisfactory materials are encountered above or at the design depth of the trench, excavate the unsatisfactory materials to three (3) feet below the design depth and replace with compacted structural fill meeting the requirements of the specifications.
D. Trench in a manner and sequence that will provide proper drainage at all times. The CONTRACTOR shall provide dewatering equipment if necessary.
E. Dispose of unsatisfactory excavated material, and surplus satisfactory excavated material, away from the work area as shown on Construction Drawings.
F. Waste shall be disposed of at the working face of the landfill.
G. Unauthorized Excavation:
1. Unauthorized excavation consists of removal of materials beyond indicated subgrade elevations or dimensions as shown on the Construction Drawings.
2. Backfill and compact unauthorized excavations as specified for authorized excavations.
H. Trenching Safety:
02225-5 TRENCHING AND BACKFILLING
1. Trenching shall be completed in accordance with 29 CFR 1910 OSHA regulations.
2. Trench boxes, shoring and bracing shall be placed in trenches in accordance with 29 CFR 1910 if personnel are to enter the trench or if the trench is susceptible to cave in.
3. Maintain sides and slopes of excavations in a safe condition until completion of backfilling.
I. Shoring and Bracing:
1. Provide all labor and materials for shoring and bracing as may be necessary for safety of personnel, protection of work, and compliance with requirements of governmental agencies having jurisdiction.
2. Maintain shoring and bracing in trenches regardless of the time period excavations will be open.
3. Remove shoring and bracing as trenching progresses.
3.6 BACKFILLING (IF APPLICABLE)
A. Backfilling shall be completed in accordance with the location of the trench as shown on the Construction Drawings.
B. Pipe bedding outside of the limits of waste shall be compacted until no noticeable deformation is observed.
C. Backfill in dual containment areas shall be completed in accordan ce with these Specifications and placed in the areas shown on the Construction Drawings.
D. Conduct air monitoring to confirm lack of surface emissions after completion of backfill. If emissions are detected, rework cover soils and cover system and recomplete air monitoring until passing per the project documents.
E. Backfill trenches to contours and elevations shown on the Construction Drawings or existing conditions as applicable.
F. Systematically backfill in uniform lifts using suitable material. Depth of lift shall be such that its required compaction can be achieved in a reasonable period of time. Moisture content of backfill material shall be within 2% of optimum moisture content as determined by ASTM or through compactive effort methods put forth in Contract Do cuments. Do not backfill over porous, wet, or spongy subgrade surfaces.
G. Place geotextile separator where indicated on the Construction Drawings.
H. Bedding Material: Place and compact bedding material s in equal continuous layers not exceeding 6 inches compacted depth. Compact each lift to a minimum of 90 percent relative compaction as determined by ASTM D1557 or by methods described in Paragraph B (above).
I. Trench Backfill: Place and compact trench backfill in equal continuous layers not exceeding 8 inches compacted depth. Compact each lift to a minimum of 90 percent relative compaction as determined by ASTM D1557 or by methods described in Paragraph B (above).
J. Employ a placement method that does not disturb or damage utilities in trench.
K. Maintain optimum moisture content of fill materials to attain required compaction density. 02225-6 TRENCHING AND BACKFILLING
L. Remove surplus fill materials from site.
M. Preparation of trench bottom: Set structure directly on a 12-inch minimum thick layer of compacted aggregate base. Mounds or bridging will no t be accepted. Provide adequate ro om for proper connections and maintain correct grade an d alignment. Do not lay in a wet trench. If material in bottom of excavation is unsuitable for supporting the structure, excavate below subgrade as directed by OWNER and backfill to required grade with aggregate base. Backfill around structures with aggregate base material.
N. Prevent entrance of trench water, rodents, or foreign material into the structure. Remove water and place adequate backfill to prevent floating. Remove and re-install structures which have floated.
3.7 FIELD QUALITY ASSURANCE
A. Top Surface of Backfilling: Plus or minus 1 inch from required elevations.
B. The OWNER or Construction Quality Assurance (CQA) Monitor, Officer, or Engineer will determine optimum moisture content, maximum density, and plasticity index for engineered fill materials in accordance with ASTM D1557-12e1 and ASTM D4318-17e1 or by other means if so directed by the OWNER (City).
C. In-place density and moisture content will be dete rmined by one or more of the following methods:
ASTM D2937-17e2, ASTM D6938-17a, ASTM D1556/D1556M-15e1, or ASTM D2216-19.
D. Cooperate fully with the OWNER in their performance of sampling and testing and in-place density and moisture testing.
E. Protect finished Work.
F. Reshape and re-compact fills subjected to vehicular traffic during construction. During Construction, trenching across main or otherwise commonly used haul and access roads shall be protected with metal
plates per Caltrans Construction Standards during trench excavation so that vehicular traffic may safely pass over the trench area. CONTRACTOR sha ll coordinate any road trenching with the OWNER prior to constructing this Work element.
END OF SECTION
11180-1 LANDFILL GAS (LFG) EXTRACTION
WELLS & VENT WELLS
SECTION 11180
LANDFILL GAS (LFG) EXTRACTION & VENT WELLS
PART 1 GENERAL
1.01 DESCRIPTION
A. Work Included:
1. The work described in this section consists of furnishing all labor, materials, equip- ment, and appurtenances necessary to drill, install, test, and make ready landfill gas (LFG) extraction wells, including valves, flexible connectors, at the locations shown on the Contract Drawings and specified herein.
B. The well screens, seals, gravel, and soil backfill packs shall be set at depths shown on the Contract Drawings or as designated in the field by the City (Owner) or Engineer. It is expected that combustible gas will be venting from boreholes drilled to install extraction wells. The Contractor’s bid price shall include provision for all equipment and procedures necessary to safely install wells under such conditions.
C. Related Work Described Elsewhere:
1. Section 02221 – Excavation.
2. Section 02225 – Trenching and Backfilling.
3. Section 15100 – Landfill Gas Piping.
4. Section 15200 – Valves and Appurtenances.
D. All work shall be performed by qualified workers in accordance with the best standards and practices of the trade.
E. The Contractor, at all times, shall keep the premises free from accumulation of waste materials or rubbish caused by their operations. Upon completion of the work, Contractor shall remove all their waste materials and rubbish from the site, as well as all their tools, construction equipment, machinery, and surplus materials, and shall leave the work “Broom Clean.”
1.02 SUBMITTALS
A. Submittals shall be made in accordance with Contract Documents – Submittals Section. In general, the following data or Shop Drawings shall be submitted to the Engineer for approval two weeks prior to construction:
11180-2 LANDFILL GAS (LFG) EXTRACTION
WELLS & VENT WELLS
1. Solid and slotted HDPE pipes.
2. Sieve analysis for gravel.
3. Bentonite data.
PART 2 PRODUCTS
2.01 PIPE AND FITTINGS
A. All HDPE pipe and fittings shall conform to the requirements of Section 15100 – Landfill Gas Piping.
2.02 GRAVEL
A. Gravel used for backfilling annular space around the slotted well casing (LFG extraction well) shall be clean, washed, and well graded in size 1-inch to 3-inch. The gravel shall be composed of clean, hard, and durable fragments or particles, free from dirt, vegetation, or other objectionable matter, and free from an excess of soft, thin elongated, laminated or disintegrated pieces.
2.03 BENTONITE
A. The bentonite material shall be granular bentonite and shall be Benseal as manufactured by Baroid Drilling Fluids, Inc. of Houston, Texas, Crumbles 8 Mesh as manufactured by Colloid Environmental Technologies Company (CETCO), Enviroplug No. 8 as manufac- tured by Wyoben, or approved equal.
2.04 VALVES
A. PVC cock valves and gate valves shall conform to the requirements of Section 15200 – Valves and Appurtenances.
2.05 FLEXIBLE CONNECTORS (NOT-IN-CONTRACT)
A. A flexible connector shall be used to connect the wellhead to the wellhead lateral or LFG lateral.
B. The connector shall be of size shown on the Contract Drawings, and shall be U.V. resistant reinforced PVC hose manufactured by QED or approved equal. The connector shall also include banding clamps and coils kit as manufactured by QED or approved equal.
C. Flex connector shall be capable of withstanding a vacuum of 29.8 inches of mercury, a pressure of 5 psi, have an operating range of -65 to 325 0 F, and provide 50 percent
contraction and 20 percent extension. The connector bend radius shall be, at minimum, 1.5 times the diameter of the hose.
11180-3 LANDFILL GAS (LFG) EXTRACTION
WELLS & VENT WELLS
2.06 WELLHEADS (NOT-IN-CONTRACT)
A. LFG extraction wells shall be equipped with a 3” diameter flanged gate valve (approved by the City) and 3” HDPE Cam-lock fittings and threaded male adaptors as shown on the Contract Drawings. Note that City Operators may elect to use different wellheads compo- nents other than those described above. Contractor will be required to construct wells under the Contract, but are not responsible for procuring or installing wellheads. See Construction Drawing details for Contractor responsibility for materials procurement and installation.
B. The wellheads shall be suitable for measuring LFG flow up to 75 scfm and comprise of the following components (City to provide and install wellheads and flexible connectors):
a) Landfill Gas Well Cap, 6” diameter wells, flange adaptors, and 6”x3” HDPE bell reducer with power lock clamps, sample ports with plugs (1/2-inch NPT), or approved equal.
b) Flex connection tubing shall be Solar guard w/ 2.38" ID x 5’ Length with yellow tint and UV inhibitors, QED Model 40947, and include banding kit, QED Model 40979. c) Gas Header adapters shall include 4"x2" Fernco flexible couplings w/ stainless steel bands, HDPE Cam-lock fittings and a 4"x 24" HDPE pipe stub up prior to a 90-degree elbow to the LFG lateral piping (Diameter shown on the Contract Drawings). d) The wellhead shall be constructed as shown on the Contract Drawings.
2.07 NUTS AND BOLTS
A. For above- and below-ground installation, bolts shall conform to the requirements of ASTM A307-14e1. Unless stated otherwise, all bolts shall be carbon steel, Grade B, heavy hex, hot dip zinc-coated in accordance with the requirements of Class C of ASTM A153/A153M-16a. Nuts shall conform to the requirements of ASTM A563-15. Nuts shall be Grade A, heavy hex, hot dip zinc-coated in accordance with Class C of ASTM A153/A153M-16a. Washers shall be Grade A, hot dip zinc-coated in accordance with Class C of ASTM A153/A153M-16a.
PART 3 EXECUTION
3.01 LFG VERTICAL WELL INSTALLATION
A. General:
11180-4 LANDFILL GAS (LFG) EXTRACTION
WELLS & VENT WELLS
1. Materials delivery, storage, and handling:
a. All HDPE blank casing and slotted casing supplied under this Contract shall be shipped, stored, and handled in accordance with the recommendations of the man- ufacturer.
2. Material Inspection:
a. Prior to well installation, all pipes, fittings, slotted casings, valves, gravel, and bentonite shall be inspected by the Contractor in the presence of the City or Engi- neer for conformance with the standards and specifications. b. All materials not meeting the requirements of the applicable specifications shall be rejected.
B. Borehole Drilling:
1. Prior to drilling, the Contractor shall have a licensed land surveyor stake the locations of the extraction wells as shown on the Drawings and have them approved by the Owner (City) or Engineer. Survey information will include horizontal and vertical coordinates. Survey may be conducted by a City licensed land surveyor, subject to approval by the City, upon Contractor request and if so specified in the Contract Doc- uments for such allowance. Some wells may be relocated to suit the field conditions.
Contractor shall have wells re-surveyed if their locations change.
2. Contractor shall coordinate the start of drilling with the City/Engineer.
3. Provide at all times a thoroughly experienced, competent driller during all operations at the drill site. The driller shall be pre-qualified by the City. The Contractor shall submit to the City/Engineer driller’s qualifications as part of bid submittal.
4. Boreholes shall be of diameter as shown on the Contract Drawings.
5. Drilling shall continue in each borehole to the depths as indicated on the Contract Drawings. The Contractor will not be paid for over-drilling beyond the depths shown on the Contract Drawings, unless authorized in writing by the Owner (City).
6. In the event that a borehole must be abandoned, the Contractor shall plug and abandon the hole from the bottom to within 5 feet of the surface using a mixture of bentonite powder and soil (5 pounds of bentonite per cubic foot of soil) and from 5 feet to the surface using a cement grout or graded bentonite plugging material, in a manner ap- proved by the Engineer. The Engineer will determine the need for abandonment. The Contractor will be paid for the time and materials expended in plugging the abandoned borehole at the price quoted in their bid, provided that the abandonment is not due to the Contractor’s negligence, carelessness, or defective equipment.
11180-5 LANDFILL GAS (LFG) EXTRACTION
WELLS & VENT WELLS
7. On completion of the drilling operation and before commencement of well casing installation, the Contractor must place a steel safety grate over the borehole as shown on the Contract Drawings. The platform shall be of sufficient size and structural strength to support expected loads during well installation. The safety grate size shall be such that all the edges rest on the undisturbed ground at least 3 feet from the edge of the borehole, which will give workers sufficient time to get away from the borehole in the event of a well-bore cave-in.
8. The CQA staff conducting drilling inspection shall prepare a log for each extraction well during drilling. Well logs shall include the names of the person(s) logging the hole and an as-built description, including a well detail which indicates well depth, extent and type of filter pack, location and depths of bentonite and soil plugs, interval of perforations, existing grade elevation, etc.
9. Drilling shall only commence once the location and elevations of any well location have been approved by the Engineer and verified by CQA, driller, and Contractor that they are accurate (based upon licensed land surveyor staked locations)-No exceptions.
Adjustments to drilling depth may be required if findings indicate otherwise and will require review and approval by the Owner (City) and/or Engineer.
C. Casing Placement:
1. The blank and slotted casing shall be installed straight and plumb in the center of the borehole at the depths shown on the Contract Drawings. During installation, a cap shall be placed over the top of the casing to prevent introduction of dirt, debris, and prevent LFG venting prior to installation of wellhead assemblies. If the pipe is in- stalled out of plumb, the Contractor shall correct the alignment at their own expense.
D. Gravel Placement:
1. Initial gravel backfilling operations shall be completed while the well casing is suspended above the bottom of the hole per the Contract Drawings. The annular space surrounding the slotted well casing shall be filled with specified filter pack of clean gravel backfill to an elevation, above the top of the slotted casing, as indicated on the Contract Drawings.
E. Soil Placement:
1. Soil backfill shall be placed at the designated locations along the bore-hole, of thickness as shown on the Contract Drawings.
F. Bentonite Plug Placement:
1. Bentonite plugs shall be placed from the bottom to the top of the plug level and shall be of thickness as shown as shown on the Contract Drawings.
11180-6 LANDFILL GAS (LFG) EXTRACTION
WELLS & VENT WELLS
2. Consistency, method of mixing and placement of the bentonite plug shall be submitted to the Engineer for review and approval prior to placing of the bentonite plug. The Contractor will not be allowed to install the bentonite plug prior to written approval of the consistency, method of mixing, and placement of the plug. No method will be permitted that does not force bentonite plug from the bottom of the plug to the top.
The Contractor shall contact the manufacturer for his recommendations regarding method of mixing and placement of bentonite plug. The following is one of the meth- ods that Contractor may adopt for bentonite plug placement:
After placing the gravel in the borehole to an elevation of 1 foot above the slot- ted casing, the Contractor shall place on top of gravel layer, a soil plug of the thickness shown on the Contract Drawings. Prior to placement of the bentonite plug, the Contractor shall thoroughly wet the soil plug. Contractor shall then pour Benseal bentonite and water simultaneously (through a tremie pipe lowered to the bottom elevation of the plug and pulled slowly upwards as bentonite is being poured in the borehole) into the hole in a systematic way to achieve a uni- form plug. A minimum of two, 50-lb bags of Benseal will be required to con- struct one foot thick bentonite plug in a borehole of 24-inch diameter (Contractor to adjust quantities for larger boreholes). The amount of water necessary to be poured into the borehole will be as recommended by the bentonite manufacturer or by predetermining through experimenting with a small quantity of bentonite the actual amount of water required to achieve a good thick mud consistency mixture. When the bentonite plug has reached the specified thickness, more water shall be poured on top of the plug and adequate hydration time will be allowed before any backfilling operation commences. A minimum hydration time for bentonite seal shall be 20 minutes or as recommended by the manufac- turer.
G. Backfill:
No backfilling operations shall be permitted until the bentonite has hydrated. Hydration time for bentonite plug is a minimum 20 minutes or as recommended by the manufacturer. 11180-7 LANDFILL GAS (LFG) EXTRACTION
W
ELLS & VENT WELLS
3.02 LFG VENT WELL RISER INSTALLATION
A. General:
1. Materials delivery, storage, and handling:
a. All Schedule 80 PVC casing (flanged base) supplied under this Contract shall be shipped, stored, and handled in accordance with the recommendations of the man- ufacturer.
2. Material Inspection:
a. Prior to vent well installation, all pipes, fittings, valves, shall be inspected by the Contractor in the presence of the City or Engineer for conformance with the tech-nical specifications.
b. All materials not meeting the requirements of the applicable specifications shall be rejected.
B. Installation, Materials & Welding:
1. Vent Well Riser shall be installed as shown on the Contract Documents.
2. The Vent Well Base shall be a minimum of 3x the diameter of the riser diameter and placed above the vent strips as shown on the Contract Drawings. The flanged portion of the vent risers shall be fastened to the 12.5-foot wide vent strips every 30 degrees around the perimeter of the base using appropriate fasteners (nylon or stainless steel) prior to placement of overlying geosynthetic cover system components.
3. Upon completion of the above, an LLDPE boot or appropriate diameter shall be welded to the LLDPE geomembrane. The method of welding shall be determined by the approved geosynthetic cover system installer and approved by the Engineer. The boot shall be clamped to the vent well riser using stainless steel clamps and the boot length shall be as shown on the Construction Drawings.
4. The Contractor shall provide the as-built description of each vent well riser, including existing grade elevation, a vent well detail which indicates well depth, and completion of all vent well risers 40-mil LLDPE well boot welded to the underlying LLDPE membrane of the geosynthetic closure cover system identified in the Contract Civil Drawings (by others). Vent wells shall be installed at locations and to depths shown on the Contract LFG Drawings. Other specified materials and details are included on the Contract LFG Drawings.
11180-8 LANDFILL GAS (LFG) EXTRACTION
WELLS & VENT WELLS
5. The Vent Well Riser shall be equipped with a 4” x 2” Fernco fitting, PVC pipe nipple and a vent body capable of releasing LFG pressure under the geosynthetic cover sys- tem. Valve material shall be polyethylene and stainless steel.
C. PVC Vent Riser Casing Placement:
1. The solid PVC casing shall be installed perpendicular to the final graded slope and at the depth shown on the Contract Drawings. During installation, a cap shall be placed over the top of the casing to prevent introduction of dirt, debris, and prevent LFG venting prior to installation of vent wellhead assemblies and pressure relief valve. If the riser pipe is installed incorrectly (i.e., not directly on the geo-vent strip), the Con- tractor shall correct the installed LFG facility at their own expense.
D. Soil Placement:
1. Soil backfill for vent well assemblies shall be compacted and placed around the perimeter vent well to thickness as shown on the Contract Drawings. Contractor shall include precautions to not allow any damage to the vent riser since it will be con- structed prior to the vegetative layer of the cover system. Should the vent riser as- sembly be damaged during construction, the Contractor shall repair the facility at their own expense.
3.03 CONTROL OF BOREHOLE EMISSION
A. It is expected that combustible gas containing trace toxic constituents will vent from boreholes. It shall be Contractor’s sole responsibility to control emissions in such a manner as to safely construct the wells, prevent violation of all applicable air quality regulations, and prevent worker exposure.
END OF SECTION
15100-1 LANDFILL GAS PIPING
SECTION 15100
LANDFILL GAS PIPING
PART 1 GENERAL
LFG HEADER AND LATERAL WORK UNDER THIS SECTION IS TO B E PERFORMED BY THE CITY. LFG WELL AND ANCILLARY EQUI PMENT/ MATERIALS IS TO B E PERFORMED BY THE CONTRACTOR.
1.01 SECTION INCLUDES
A. Furnishing all labor, materials, equipment, tools, and appurtenances required to complete the installation of the landfill gas collection piping, condensate air supply and force-main piping, and other associated piping.
1.02 RELATED SECTIONS
A. Section 02225 – Trenching and Backfilling.
1.03 REFERENCES
A. ASTM International.
B. ASTM A536-84 (2019)e1– Standard Specification for Ductile Iron Castings.
1. ASTM D2513-20 – Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings.
2. ASTM D3261-16 – Standard Specification for Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing.
3. ASTM D3350-14– Standard Specification for Polyethylene Plastics Pipe and Fittings Materials.
4. ASTM F1055-16a - Electrofusion Type Polyethylene Fittings.
C. American Society of Mechanical Engineers (ASME).
1. ASME B16.5 – Pipe Flanges and Flanged Fittings NPS 1/2 through NPS 24 Metric/Inch Standard- Revision of ASME B16.5-1999.
D. American Water Works Association (AWWA).
1. AWWA C207-18 – Steel Pipe Flanges for Waterworks Service - Sizes 4 in. Through 144 in. (100 mm through 3,600 mm).
1.04 DEFINITIONS
A. Landfill gas piping: shall include, but not be limite d to header piping and lateral piping, landfill gas (LFG) extraction well piping, landfill gas wellhead piping, and all other applicable piping associated with the landfill gas collection and control system (GCCS).
1.05 SUBMITTALS
A. Polyethylene (PE) Pipe: Submit manufacturing test specification data listing resin type, cell classification, stock density, melt flow, flexural modulus, tensile strength, and coloration. Include results of tests with shipment of materials, with 2 additional copies of test results.
15100-2 LANDFILL GAS PIPING
1.06 QUALITY CONTROL
A. Source Quality Control: If Manufacturer’s test data is inadequate or unavailable, the OWNER (City) or Engineer reserves right to reject or require additio nal tests to satisfy material requirements at no additional cost to the OWNER.
B. Comply with appropriate codes and standards of following organizations for handling, fusion, and underground installation of low pressure polyethylene pipe.
1. American Gas Association (AGA).
2. Plastic Pipe Institute (PPI).
3. ASTM.
4. ANSI.
5. ASME.
C. Provide pipe welding personnel that have at least 1 year of experience in the use of the fusion welding procedure specifically in cold weather climates and currently certified as fusion welder.
1.07 DELIVERY, STORAGE, AND HANDLING
A. Store or stack pipe so as to prevent damage from marring, crushing or puncture. Limit maximum stacking height to 6 ft.
B. Store in accordance with manufacturer’s recommendations.
C. Protect pipe from excessive heat or harmful chemicals.
PART 2 PRODUCTS
2.01 POLYETHYLENE (PE) PIPE
A. Provide PE pipe of SDR indicated on the Contract Drawings complying with ASTM D 3350-14. Piping shall conform to either ASTM D 2513-20 or F 714-21 or superseded standard.
B. Physical Properties of HDPE Pipe
1. High Performance, high molecular weight, high density polyethylene pipe (type 3408 resin).
2. ASTM D3350-14, minimum cell classification value 345464C.
3. Standard dimension ratio: See Drawings.
4. Marking: Intervals of 5 ft. or less.
a. Manufacturer’s name or trademark.
b. Nominal pipe size.
c. Type of plastic pipe (i.e., PE3408/PE3608).
d. Standard dimension ratio (i.e., SDR 17) or as specified on the Construction Drawings or within these Technical Specifications.
e. ASTM D2513-20.
f. Extrusion date, period of manufacture or lot, or batch number. g. Provide PE products made from a high densit y, high modulus resin conforming with cell classification PE 345464C or better in accordance with ASTM D3350-14.
C. Dimensions:
1. Conform to standard dimensions and tolerances of ASTM D2513-20.
15100-3 LANDFILL GAS PIPING
2.02 PE FITTINGS
A. Provide fittings from polyethylene (PE) compound having cell classification equal to or exceedi ng co
mpound used in pipe to insure compatibility of polyethylene resins.
B. Flan
ge Joints:
1. 1
50-lb carbon steel or convoluted epoxy coated ductile iron backup flanges as recommended by manufacturer.
2. Zinc plated carbon steel nuts, bolts, and washers.
3. Neoprene full face flange gaskets.
4. Fl
anges and bolt patterns consistent with ASME B16.5/AWWA C207-18/ASTM A536-84(2019)e1, as recommended by manufacturer.
C. Dimensions of fittings conforming to standard dimensions and tolerances according to ASTM D3261-
16. D. Provide fittings with pressure rating equal to or greater than pressure rating of pipe.
2.03 POLYVINYL CHLORIDE (PVC) PIPE:
A. Provide Schedule 40 (if applicable) and Schedule 80 PVC pipe complying with ASTM D 1785-15e1.
B. PVC Fitting
s:
1. Provide Schedule 40 PVC fittings 8 inches and smaller complying with ASTM D 2466-17, socket-type.
2. Provide PVC fittings 10 inches and larger rated for minimum pressure of 80 psig at 73°F and injection molded from Type 1 PVC.
3. Provide Schedule 80 PVC fittings complying with ASTM D 2467-20 for socket-type and ASTM D 2464
-15 for threaded-type.
C. PVC Fla
nges:
1. Provide 150-pound, flat-face, socket-type Schedule 80 PVC flanges. Diameter and drilling of flanges shal
l comply with ANSI B16.5 for Class 150.
2. Provide full-face, neoprene flange gaskets, 1/ 16-inch thick with "A" scale hardness of 45 to 60 durometer.
3. Provide correct number and sizes of steel hexagon bolts, washers, and hexagon nuts, electrogalvanized with zinc or cadmium.
D. PVC Solvent Primer: Provide solvent primer as recommended by PVC product supplier and complying with ASTM F 656-15. Use of solvent primer is subject to approval from the Engineer.
E. PVC So
lvent Cement: Provide medium-bodied solvent cement as recommended by PVC product supplier and complying with ASTM D 2564-20. Use of solvent cement is subject to the approval from th e En
gineer.
2.04 CORRUGATED METAL PIPE (CMP) AND STEEL PIPE (IF APPLICABLE) A. All corrugated metal pipe to be used for road crossing encasements for the LFG main head er or lateral pi
pe shall be gauge 16 aluminized steel pipe. Schedule 40 Steel pipe may be used for shallow burial locations as shown on the Construction Drawings.
B. Co
rrugated metal pipe and Schedule 40 Steel pipe shall be sized as shown on the Contract (Construction) Drawings.
15100-4 LANDFILL GAS PIPING
PART 3 EXECUTION
3.01 FIELD QUALITY CONTROL
A. Pipe will be rejected for failure to conform to Specifications, or for the following:
1. Fractures or cracks passing through pipe wall, exce pt single crack not exceeding 2 inches in length at either end of pipe which could be cut off and discarded. Pipes within one shipment will be rejected if defects exist in more than 5% of shipment or delivery.
B. Pipe will be rejected for cracks sufficient to impair strength, durability, or service-ability of pipe.
1. Defects indicating improper proportioning, mixing, and molding.
2. Damaged ends, where such damage would prevent making satisfactory joint.
C. Acceptance of fittings, stubs, or ot her specifically fabricated pipe sections will be based on visual inspection at Project site and documentation that they conform to these Specifications.
3.02 INSTALLATION
A. Trench, backfill, and compact in accordance w ith Section 02225-Trenching and Backfilling (if applicable); and, Construction Drawings.
B. Carefully lower pipes and fittings into trenches.
C. CONTRACTOR to account for seasonal impacts on PE pipe lengths prior to welding and insulation per manufacturer’s recommendations. For example, for summertime installations provide a slightly longer length of HDPE pipe when connections are made between two fixed points or structures to compensate for contraction of the pipe in a cooler trench bottom. Provide additional pipe lengths in accordance with the HDPE pipe manufacturer’s instructions and/or as shown on the Construction Drawings.
D. Install pipe and fittings so that there will be no deviation at the joints and so that inverts present a smooth surface. Pipe and fittings that do not fit together to form a tight fitting joint are not permitted.
E. Install pipes in the locations and to the required lines and grades indicated on the Construction Drawings.
F. Maintain trench excavations that are free of water du ring the progress of the work. Do not lay pipes in water. Do not weld pipe joints in water.
G. Repair trench cave-ins.
H. Maintain pipe, fittings and pipe interiors in a clean condition throughout installation.
I. Correct and adjust line and grade of pipe by scraping earth foundation or by scraping away or compacting fill under the barrel of the pipe. Do not block or wedge pipe.
J. Wherever the trench has been excavated to a depth in excess of 6 inches below design grade, correct the grade by placing crushed stone or gravel fill.
K. If unsuitable materials or unsuitable conditions are encountered in the trench, the OWNER may direct excavation below design grade and placement of gravel or crushed stone foundation to backfill the trench to design grade. This work will be done by Change Order.
L. Install fittings at locations indicated on the Constr uction Drawings. Do not install pipe fittings after laying pipe.
M. Do not change the location of trenching pipe laying or pipe sizes without OWNER’s or Engineer’s approval.
15100-5 LANDFILL GAS PIPING
N. Install piping to form a completely connected system, including connections to valves and appurtenances specified in other sections.
3.03 HEAT FUSION OF PE PIPING:
A. Join PE pipe by butt-fusion method, providing a completely uniform and monolithic pipe interior.
B. Join pipe sections at ground level to a length recommended by the manufacturer such that maximum allowable stress, when pulling the pipe into po sition alongside the trench, is not exceeded. Use appropriate materials and equipment, as recommended by the PE pipe manufacturer, when pulling butt-fused pipe sections alongside the trench to prevent pipe damage.
C. Use detergents and solvent solutions, when required to clean pipe ends. Use in accordance with manufacturer’s recommendations.
D. Do not bend pipe to a radius greater than that recommended by manufacturer for that type and grade of pipe.
E. Do not subject pipe to strains that will overstress or buckle piping or impose excessive stress on joints.
F. Join branch saddle or tee connections in accord ance with manufacturer’s recommendations and procedures. Provide branch saddle fusion equipment of the size necessary to properly facilitate saddle fusion within the trench. Tees shall be used for the project, unless specified otherwise.
G. Before butt fusing pipe, inspect each pipe section fo r presence of dirt, sand, mud, shavings, and other debris or animals. Remove debris and animals from pipe.
H. At end of each working day, cover open ends of fused pipe. Cap to prevent entry by animals or debris.
I. Use compatible fusion techniques when polyethylene pipes of different melt indexes are fused together.
Refer to manufacturer’s specifications for compatible fusion.
3.04 FLANGE JOINING
A. Use on PE flanged pipe connection sections or Electrofusion couplers as shown on the Construction drawings. Use of electrofusion couplers is at the discretion of the Engineer.
B. Connect slip-on carbon steel backup flanges with nuts and bolts.
C. Butt fuse PE fabricated flange adapters to pipe.
D. Take the following precautions when connecting flange joints.
1. Align flanges or flange/valve connections to provide tight seal. Neoprene full face gaskets are required for flange/valve connections.
2. Place U.S. Standard round stainle ss steel (SS) washers as may be required on some flanges per manufacturer’s recommendations. Lubricate bolts in accordance with manufacturer’s recommendations.
3. Tighten flange bolts in sequence and accordance with manufacturer’s recommendations. CAUTION:
Do not over-torque bolts.
4. Tighten bolts in sequence to uniform torque in accordance with manufacturer’s recommendations.
3.05 PIPE PLACEMENT
A. Provide grade control equipment to accurately install pipe to design grades and slopes. Slope may not vary by more than 0.1% from the design slope, unless otherwise approved by the City.
15100-6 LANDFILL GAS PIPING
B. Maximum lengths of fused pipe to be handled as one section shall be placed according to manufacturer’s recommendations as to pipe size, pipe SDR, and topography so as to not cause excessive gouging or surface abrasion; and, not to exceed 400 ft.
C. Correct irregularities found during inspection.
D. Complete tie-ins within trench (if applicable) whenever possible to prevent overstressed connections.
E. Allow pipe sufficient time to adjust to trench te mperature prior to any testing, segment tie-ins, or backfilling activity.
F. Install reducers adjacent to PE laterals or tees.
G. Place in trench (if applicable) by allowing at least 12 in. /100 ft for thermal contraction and expansion.
3.06 PIPE TESTING
A. Test pipe sections in accordance with LFG Design Engineer directives.
B. Pig all piping sections to clean pipe shavings prior to placing the LFG piping in operation.
END OF SECTION
15200 - 1 VALVES AND APPURTENANCES
SECTION 15200
VALVES AND APPURTENANCES
PART 1 GENERAL
LFG VALVES AND APPURTENANCES UNDER THIS SECTION IS TO BE
PERFORMED BY THE CITY UNLESS OT HERWISE SHOWN ON THE CONTRACT DRAWINGS.
1.01 SECTION INCLUDES
A. Furnishing all labor, materials, tools, equipment, and performing all work and services necessary for or incidental to installation of all types of valves in corporated in the work, including the items in the schedules indicated on the Construction or Contract Drawings and as specified herein.
B. Although such work is not specifically shown or sp ecified, furnishing and installing supplementary or miscellaneous items, appurtenances and devices incide ntal to or necessary for sound, secure, complete and compatible installations.
1.02 RELATED SECTIONS
A. Section 02221 – Excavating.
B. Section 02225 – Trenching and Backfilling.
1.03 REFERENCES
A. ASTM D1784-20 – Standard Specification for Rigid Poly Vinyl Chloride (PVC) Compounds and Chlorinated Poly Vinyl Chloride (CPVC) Compounds.
1.04 SUBMITTALS
A. Per Contract Documents (City Bid Documents) Submittal Section.
B. Information contained in submittals must include, but is not necessarily limited to, the following:
1. Valve pressure/temperature rating and flange rating.
2. Valve body material and valve trim.
3. Operator and actuators.
4. Inner lining material, lining pressure and temperature.
5. Indicator attachments.
6. Valve dimensions, weight and class.
7. Maximum non-shock shutoff.
8. Valve flow coefficient Cv.
15200 - 2 VALVES AND APPURTENANCES
1.05 DELIVERY, STORAGE, AND HANDLING
A. Inspect materials thoroughly upon arrival. Examin e materials for damage. Report damaged material immediately. Secure and pay for replacement material items immediately.
B. Store valves in approved sheltered locations. Ensure site is accessible in all types of weather.
C. Observe manufacturer’s directions regarding storage, handling, and incorporating in Work.
PART 2 PRODUCTS
2.01 GENERAL
A. Provide valves of same manufacturer throughout where possible.
B. Provide valves with manufacturer’s name and pressure rating clearly marked on outside of body.
C. Valves to be same size as pipe in which they are installed unless otherwise indicated on the Construction Drawings.
D. Handle valves, fittings, and other accessories in such manner as to ensure delivery to the point of installation in sound, undamaged condition. Carry, do not drag structures and materials to the point of installation.
E. Provide all valves, except those specified otherwise, with appropriate operator. Ensure direction of rotation to open each valve is from right to left (counter-clockwise). Furnish valve body or operator with impression cast showing word “OPEN” and arrow indicating open direction.
F. Furnish valves suitable for their intended use.
2.02 VALVES
A. Butterfly Valves:
1. Valve manufacturer and type: ABZ, butterfly type.
2. 6 inch and smaller: Provide lever-operated handle.
3. 8 inch and larger: Provide gear-operated handle.
2.03 PIPE SUPPORTS
A. Provide the pipe supports as shown on the Contract (Construction) Drawings, specified, and required to adequately support and secure all piping systems.
1. Provide pipe supports fabricated from metal fra ming channel and fittings with electrogalvanized zinc or cadmium finish, as supplied by Unistrut, Superstrut, or Engineer or City approved equal.
2. Provide pipe anchors and guides fabricated from galvanized steel to the dimensions shown in the LFG Contract Drawings. Anchors should not allow pipe slippage under loading. Provide clearance between guides and the outside diameter of the pipes, to allow free sliding.
15200 - 3 VALVES AND APPURTENANCES
IMPORTANT: A GEOSYNTHETIC COVER SYSTEM UNDERLIES THE ANCHORS.
SPECIAL CARE SHALL BE TAKEN TO NOT DAMAGE THE UNDERLYING CLOSURE COVER SYSTEM.
PART 3 EXECUTION
3.01 INSTALLATION
A. Install valves with stems upright or horizontal, not inverted.
B. Tighten valve flange bolting per manufacturer’s recommendations.
C. Install valves per manufacturer’s recommendations.
3.02 TRENCH EXCAVATION, BEDDING, AND BACKFILL (IF APPLICABLE) A. Trench excavation, bedding, and backfill conforming to the requirements of Section 02225.
3.03 PLACEMENT
A. Place all structures and maintain lines and grades as indicated on the Drawings. Do not deviate from the required line or grade except with permission of the OWNER.
B. Strictly adhere to the installation recommendations of the equipment or material manufacturers.
C. Also comply with the following requirements. Provide all special tools and devices such as jacks, chokers, and similar items necessary for the installation.
END OF SECTION
RESOLUTION NO. 2025-
Adopted by the Sacramento City Council on June ___, 2025
Suspend Competitive Bidding and Award a Construction Contract for the City of Sacramento Cannon-Scollan Landfill Closure Program (Y13000200)
BACKGROUND
A. The Cannon-Scollan Landfill, owned by the City of Sacramento, originally consisted of two separate sites used for refuse disposal sites in the late 1950s. Under current regulations, landfills that no longer accept waste must be properly capped and closed. The City is responsible for preparing both the Cannon-Scollan Landfill and the adjacent Dellar Slope property for postclosure maintenance in accordance with an approved plan and construction schedule.
B. On March 18, 2025, the Department of Public Works issued Request For Bid (RFB) No. B25014541001 for the Cannon-Scollan Landfill Closure Project. The engineer’s estimate for this project was $2,500,000. Bids closed on April 23, 2025. No contractors submitted a bid. Republishing the bid would cause delays with the construction schedule. Any delay may impact the City’s ability to complete the project before the June 30, 2026 expiration date of the grant from the California Department of Resources Recycling and Recovery (CalRecycle) that partially funds this project. Suspending competitive bidding allows the City to complete the project on time with grant funding, which is in the best interest of the City.
C. The estimated cost to complete the Cannon-Scollan Landfill Closure Project (Y13000200) is $4,262,101. These funds are designated for administrative and construction costs related to the project.
D. Upon approval of the transfer of $2,900,000 (General Fund, Fund 1001) there will be sufficient funding within the Cannon-Scollan Landfill Closure Project (Y13000200) to cover the total project cost, including the construction contract with Carone and Company, Inc. for $3,326,593, as well as other project expenses such as internal City staff time, project management, and a minor contingency. Any project savings will be returned to the Commercial Waste Compliance Project (I15220000) upon completion.
E. There is sufficient funding within the Commercial Waste Compliance Project (I15220000) to complete the transfer of $2,900,000 (General Fund, Fund 1001) to Cannon-Scollan Landfill Closure Project (Y13000200).
BASED ON THE FACTS SET FORTH IN THE BACKGROUND, THE CITY COUNCIL RESOLVES AS FOLLOWS:
Section 1. In the best interests of the City, competitive bidding is suspended for the Cannon-Scollan Landfill and Dellar Slope Closure project construction contract. This will allow the City to complete the project on time with grant funding, which is in the best interest of the City.
Section 2. The City Manager or designee is authorized to award a construction contract to Carone and Company, Inc. in an amount not to exceed $3,326,593 for the Cannon-Scollan Landfill Closure Project.
Section 3. The City Manager or designee is authorized to transfer $2,900,000 (General Fund, Fund 1001) from the expenditure budget of the Commercial Waste Compliance Project (I15220000) to the Cannon-Scollan Landfill Closure (Y13000200).
Section 4. The City Manager or designee is authorized to execute the construction contract to Carone and Company, Inc. in an amount not to exceed $3,326,593 for the Cannon-Scollan Landfill Closure Project (Y13000200).