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HomeMy WebLinkAbout1.12 Relevant specificationsChevron 0 Washington Group International Integrated Engineering, Construction, and Management Solutions PICEANCE BASIN NATURAL GAS DEVELOPMENT PROGRAM GARFIELD COUNTY, COLORADO SPECIFICATION FOR RE- VEGETATION OF DISTURBED AREAS REVISIONS CLIENT: Chevron North America Exploration and Production PROJECT: Piceance Basin Natural Gas Development Program JOB NO.: 29021 -003 DOC. NO.: WGI- 29021 - 003 -12 -0 -004 B Updated with Specific State / County Requirements SMC 12 -18 -07 A Issued Preliminary for Review and Comments KCH JRV 8 -17 -07 REV. DESCRIPTION BY CHKD APVD RVWD DATE REVISIONS CLIENT: Chevron North America Exploration and Production PROJECT: Piceance Basin Natural Gas Development Program JOB NO.: 29021 -003 DOC. NO.: WGI- 29021 - 003 -12 -0 -004 Ch 0 Washington Group International Date: Rev: 8/10/07 A RE- VEGETATION OF DISTURBED AREAS PiCEANCE NATURAL GAS DEVELOPMENT PROGRAM Doc. No. WGI- 29021- 003 - 12.0.004 Page: 2 of 10 TABLE OF CONTENTS SECTION PAGE 1. GENERAL 3 1.1 Scope 3 1.2 Related Specifications 3 1.3 Definitions 3 1.4 References and Standards 3 1.5 Submittals 4 1.6 Quality Assurance 4 1.7 Delivery, Storage, and Handling 4 1.8 Warranty 4 2. PRODUCTS 5 2.1 Materials 5 3. EXECUTION 6 3.1 General 6 3.2 Seeding Methods for Slopes Less than 3% 6 3.3 Seeding Methods for Slopes Greater than 3% 7 3.4 Mulching 7 3.5 Maintenance 7 3.6 Workmanship 8 3.7 Field Quality Control 8 3.8 Adjusting and Cleaning 8 3.9 Protection 8 Chevron 0 Washington Group International Date: 8/10/07 RE- VEGETATION OF DISTURBED AREAS Doc. No. WG1- 29021- 003 -12 -0 -004 Rev: A PICEANCE NATURAL GAS DEVELOPMENT PROGRAM Page: 3of 10 1. GENERAL 1.1 Scope This Specification covers the site conditions, materials and construction requirements for native grass seeding for the Chevron Piceance Basin Natural Gas Development Program. Services for this work shall consist of, but not necessarily be limited to the following: general preparation, preparation for seeding, seed placement, mulching, maintenance, workmanship, field quality control, adjusting, cleaning and protection. State and local laws concerning pollution abatement will be followed. 1.2 Related Specifications 1.2.1 Specification No.12 -0 -002 — Site Preparation and Earthwork 1.2.2 Specification No.12 -0 -003 — Erosion and Sediment Control 1.3 Definitions 1.3.1 Owner: Chevron North America Exploration and Production Company 1.3.2 Engineer: Washington Group International, Inc. All references to Engineer refer to the Engineer or his /her designated representative. 1.3.3 Contractor: TBN 1.3.4 Subcontractor: Firm undertaking the scope of work as defined in this Specification 1.3.5 State: Refers to the state of Colorado 1.4 References, Standards, and Guidance The codes, standards, regulations, and guidance documents of the following organizations in effect as of August 10, 2007 form a part of this Specification to the extent indicated by the references thereto: 1.4.1 Occupational Safety and Health Act (OSHA), 24, CFR 1926, OSHA Standards for the Construction Industry. 1.4.2 Colorado Department of Transportation (CDOT), Standard Specifications for Road and Bridge Construction. 1.4.3 Bureau of Land Management (BLM) — Oil and Gas, Surface Operating Standards for Oil and Gas Exploration and Development. Fourth Edition. 1.4.4 Garfield County Vegetation Management Guidance — Noxious Weed List, Reclamation Standards, Weed Management Plan, Re- vegetation Guidelines Should a conflict be found to exist between any applicable portion of the referenced codes and standards and this Specification, the conflict shall be submitted to the Engineer for resolution before proceeding with the affected work. Chevron 0 Washington Group International Date: 8/10/07 RE- VEGETATION OF DISTURBED AREAS Doc. No. WGE- 23021 - 003 -12 -0 -004 Rev: A PICEANCE NATURAL GAS DEVELOPMENT PROGRAM Page: 4 0110 1.5 Submittals 1.5.1 If requested by the Engineer, furnish an affidavit from each manufacturer or producer certifying that the materials or products delivered to the Project site meet the specified requirements. A. However, such certification shall not relieve the Subcontractor from the responsibility of complying with added requirements specified herein. 1.5.2 Furnish to Engineer, a signed statement certifying that the seed furnished is from a lot that has been tested by a recognized laboratory for seed testing, six months prior to date of delivery. A. Provide certification tags for the seeds. 1.6 Quality Assurance Qualifications: Work to be performed shall be executed by a single firm who specializes and has full knowledge and experience in re- vegetating disturbed areas in Colorado using native species and who has satisfactorily performed work of this type on other projects of comparable size and scope as this Project. 1.7 Delivery, Storage, and Handling 1.7.1 Seed: Deliver each specified seed species to Project site in separate, sealed, original containers which show an analysis of the seed made by an approved authority. A. Seed shall be fresh stock and labeled in accordance with U.S. Department of Agriculture Rules and Regulations under the Federal Seed Act. B. Upon request of the Engineer or its designated representative, submit two copies of invoices showing type and quantity of seed materials. 1.7.2 Mulch (if used): Do not use old dry straw that breaks in the crimping process in lieu of bending. A. Such straw will not be accepted, and shall be removed from the Project site. B. All mulch shall be certified noxious weed free. 1.8 Warranty 1,8.1 Photographic documentation of the construction site is required to establish the baseline for the warranty. 1.8.2 Subcontractor shall continue to monitor the re- vegetated area and reseed areas as required until the conditions in B. are met. A. Warranty period shall commence upon acceptance of work by the Engineer. B. Warranty period shall end when the Engineer has determined that the vegetation density of the reseeded area has reached 70 percent of the original vegetation density. 1.8.3 Reseed all areas where there is not a satisfactory stand of native grass as determined by the Engineer. The length of the warranty period will vary by season and will be agreed to between Subcontractor and Engineer at the time of re- vegetation activities. 0 Washington Group International Chevron NINO Date: 8/10/07 RE- VEGETATION OF DISTURBED AREAS Doc. No. WGI- 29021 - 003 -12 -0 -004 Rev: A PICEANCE NATURAL GAS DEVELOPMENT PROGRAM Page: 5 of 10 A. Process will be repeated until the stand of native grass over all areas designated for re- vegetation has met the 70 percent of original vegetation criterion. Reseeding shall be at the Subcontractor's expense. 2. PRODUCTS 2.1 Materials 2.1.1 Seed: Seed shall be in accordance with the seed mix identified in B. Seed and seed labels shall comply with all current state and federal regulations and shall be subject to the testing provisions of the association of official seed analysis. A. Provide fresh, clean, new -crop seed complying with the tolerance for purity and germination established by the Official Seed Analysts of North America. B. Provide seed of the grass species, proportions, and minimum percentages of purity, germination, and maximum percentage of weed seed specified as follows.. Seed Mix for Sites below 7000 ft Scientific Name Seeds per pound Common Name/ Preferred Cultivar PLS/ ftZ of mix by PLS weight Application Rate (Ibs PLS /acre) _ Achnathernum hymenoides 140,000 Indian ricegrass/ Paloma* 4 12.5 1.25 Hesperostipa comata comata 115,000 Needle and thread 4 15 1.5 Pascopyrum smithii 140,000 Western wheatgrass/ Arriba* 10 31 3.1 Pseudoroegneria spicata spicata 140,000 Bluebunch wheatgrass/ P7 10 31 3.1 Sifaniorr hystrlx 192,000 Bottlebrush /squirreltail 4 10 0.90 Poa canbyi 925,000 Canby bluegrass/ Canbar 4 0.5 0.19 Total 36 100 _ 10.04 * Use only this cultivar, as recommended by Natural Resources Conservation Service and the Colorado Natural Heritage Program, 1998. Seed Mix for Sites above 7000 ft See Attachment 1, which describes seed mixes for three higher - elevation environments developed by the Bureau of Land Management Glenwood Springs Energy Office (memo dated April 16, 2007). C. Notify the Engineer in writing prior to seeding, for review of the following: • Seed mix to be used. • Percentage of purity and germination. • Pounds of pure live seed per pound of seed. • Selected method of seeding. D. Furnish seed free from noxious weeds. Chevron 0 Washington Group international Date: 8/10/07 RE- VEGETATION OF DISTURBED AREAS Doe. No. WGI- 29021 - 003 -12 -0 -004 Rev: A PICEANCE NATURAL GAS DEVELOPMENT PROGRAM Page: 6 of 10 E. Do not use seed that has become wet, moldy or otherwise damaged in transit or in storage. F. Use only seeds from a lot tested by a recognized laboratory within six months prior to delivery. G. Seed purity, germination, and mixture proportions shall meet the requirements listed in B above. 2.1.2 Topsoil: Use nearby topsoil stockpiles that were set aside as part of the excavation. Areas with minimal topsoil may require the addition of mulch. A. See 3.2 and 3.3 for soil preparation requirements. 3. EXECUTION 3.1 General 3.1.1 Do not start preparation work until after all related site work within the areas to be revegetated, including site utilities, has been completed, tested, and backfilled to the satisfaction of the Contractor. The following general requirements apply: A. Seeding activities should be limited to cooler, wetter months (typically September through June) when conditions are favorable for germination, B. Fertilization is not required (promotes rapid weed growth), C. Do not seed when wind velocity exceeds five miles per hour, and D. Sow no less than the quantity of seed specified. 3.2 Seeding Methods for Slopes Less than 3% 3.2.1 Each species of seed shall be in separate bags so that each size group of seed can be metered at the appropriate rate. 3.2.2 Small seeds, such as canby bluegrass (Poa canbyl), can be difficult to apply at the small rates required. Use of wheat bran or rice hulls or other adjuvant to assist metering of the small seeds may be required. 3.2.3 Preferred Method: Multiple Seed Bin Rangeland Drill A. No soil preparation required other than simple grading to slope and waterbars at 50 -foot spacing. 3.2.4 Alternative Methods A. Broadcast seeding methods: Seeding rate must be doubled for broadcast application. 1. Harrow: Harrow with just enough soil moisture to create a rough surface; broadcast seed and re- harrow at 90° to first harrow. 2. Hand raking and broadcast seeding followed by re- raking at a 90° angle to the first raking. Chevron Washington Group International Date: 8/10/07 RE- VEGETATION OF DISTURBED AREAS Doc. No. WGI- 29021- 003 -12 -0 -004 Rev: A PICEANCE NATURAL GAS DEVELOPMENT PROGRAM Page: 7 of 10 B. Hydro - seeding C. Other methods as agreed to by Engineer. 3.2.5 Application Rates: A. See application rates in 2.1.1B. 3.3 Seeding Methods for Slopes Greater than 3% 3.3.1 Imprinting seedbed is required. A. Imprinting can be accomplished using dozer tracks or furrows perpendicular to the direction of the slope. B. When hydro - seeding, imprinting shall be conducted prior to seeding. C. Harrowing and broadcast seeding: imprinting shall be done as part of harrowing. D. Furrowing: obtain approval for method from Engineer. 3.3.2 If mulch will be crimped into the soil surface, imprinting is not required. 3.4 Mulching Mulching is not required for most methods. Temporary and permanent erosion control blankets may be used or straw can be crimped into soil during drill seeding. 3.5 Maintenance Maintain until the revegetated area has reached 70 percent of original vegetation density. 3.5.1 Begin maintenance of seeded areas immediately after each area is planted and continue until the Owner's acceptance of the Project. 3.5.2 Maintain seeded by preventing erosion and replanting as required to meet the 70 percent of original vegetation criterion. 3.5.3 Replant bare areas using the same materials specified above. 3.5.4 When maintenance is taken over by the Owner during the guarantee period, the Subcontractor shall periodically inspect the maintenance operation of the Owner. A. The Subcontractor shall promptly report to the Owner any methods, practices or operations which he considers unsatisfactory, not in accord with his interest or not in accord with good horticultural practices. B. Failure of Subcontractor to inspect and report shall be construed as an acceptance of Engineer operations. 1. No claims from the Subcontractor will be recognized thereafter should any defects develop later that are the result of such methods, practices or operations. Chevron 0 Washington Group International Date: Rev: 8/10/07 A RE- VEGETATION OF DISTURBED AREAS PICEANCE NATURAL GAS DEVELOPMENT PROGRAM Doc. No. Page: W GI- 29021 - 003 -12 -0 -004 8 of 10 3.6 Workmanship 3.6.1 Perform all Work in a careful and orderly manner with due consideration for the protection of adjoining property. 3.6.2 Keep drainage structures clean during installation of Work. 3.7 Field Quality Control 3.7.1 Acceptance for Start of Maintenance: Notify the Contractor or its designated representative of completion of all seeding required. A. Review of seeded areas will be by the Contractor or its designated representative, and he will determine whether Work is acceptable and whether the maintenance period can begin. 3.7.2 Final Acceptance: Notity Contractor in writing of completion of the required maintenance. A. Within ten days of owner's notification, inspection for final acceptance will be made by a representative for the Contractor and the Subcontractor. B. For final acceptance the terms of the warranty must be met and the Project site shall be in acceptable clean condition. 3.8 Adjusting and Cleaning 3.8.1 Work is complete when the premises are clear of all rubbish, refuse and debris, leaving premises in a clean and orderly condition. 3.8.2 Repair damage done to property on or off premises by reason of required Work without additional cost to the Contractor. 3.9 Protection Restrict foot and vehicular traffic on seeded areas until the completion of the established period. Chevron Washington Group International Date: 8/10/07 RE- VEGETATION OF DISTURBED AREAS Doc. No. WGI-29021-003-12-0-004 Rev: A PICEANCE NATURAL GAS DEVELOPMENT PROGRAM Page: 9 of 10 Attachment 1: Seed Mixes for Environments above 7000 ft Source: Bureau of Land Management, Glenwood Springs Energy Office, Memo, April 16. 2000 Table 1 -2. Pinyon - Juniper W'oodlancl and/or Mountain/Wyoming! Big Sagebrush Shrubland Colnmoui lame Scientific Names Variety Season Form PLS Ibs /acre^ Plant the Follotsittg (10% Total) lncltan Ricegrass .iclmathei•um (0t?._opsis] ii rnenoides Nezlaar_ Paloam. 1 Rin ock Cool Bunch 1.9 and Both of the Following (154b Each. 50% Total) Galleta Pleuaaphis (Htlona] jainesii Viva florets Warm Bunch 2.5 Bluebuncb Zt heatgrass Pseudoroegne-ria spicara, Agr open on spicanmrri Secar_ P -7. Anatone Cool Bunch 2.8 and One of the Following (20% Total) Thick -spike \Vheatgrass Eltr,ms Inrtceolorhs ssu. la�iceolants, -4gropircn dastSiaClitldfli C'ritana. Cllt 2lld11tYa1' Cool Sod - forming 3.3 Slender tti'lteatgrass Elvr us naeJlycaulus, .-Igropsroti rraclrscaaltltu San Luis Cool Bunch 3.3 and Two of the Following (40% Total) Muttongtass Pon feudlerrnrta Cool Bunch 0.6 Sandberg Bluegrass Pon saii(rbe gtt, Pon secnnda Cool Bunch 0.6 Bottlebnssh Squineltail Elanus eh'moides, Sitanion lirsnir Cool Bunch 2.7 'Based on 60 pure lire weds (PLS% per srinare foot, drill - seeded. Double tin's rate (I20 PLS per square foot) if broadcasr or hvdroseeded. 0 Washington Group International Chevron IWO Date: 5/10/07 RE- VEGETATION OF DISTURBED AREAS Doc. No. WGI- 29021 - 003 -12 -0 -004 Rev: A PICEANCE NATURAL GAS DEVELOPMENT PROGRAM Page: 10 of 10 Table 1 -3. Mixed Mountain Shrublaiid.I 'chiding Oakbrusli Common Name Scientific Naives Variety Season Form PLS lbslacre* Plant Both of the Following (20% Each, 401/4 Total) Thic:spike Theatorass El:rows lanceolatrrs 5s p lanceolatrrs, A�ror. ro! dasistncJ na Critaua, Scnceudsmar Cool Sod- forming .1 Bluebunch Sheatgrass .Pseirioroeeneria spicata, Agopiror spit-rem Seca *, Auatoua Cool Bunch 3.3 and One of the Following (201 Total) Bottlebrush Scluirreltail Eh•mus el4'nroides, Sirarrion iil'sttis Cool Buick 2.7 Slender 4 1ieatgrass Et1mns tr•acltiraulru, .- tgrapirall rr•ackvcarrlrirn San Luis Cool Bunch 3.3 and One of the Following (201:4 Total) Canby Bluegrass Pon canbii, P. secunda C'anbar Cool Bunch 0.6 Mutton Bluegrass Pon feiu11'i ana Cool Cool B,umai 0.6 and One of the Following (10 °/4 Iotal) Letierrnan Needlegrass .KCit tin therm [Stipa] letter•rnanii Sod-forming Cool Bunch 1.7 Columbia Xeedlegrass .4ci! athEr•unr [5 ipaJ nelsoN'ii, 577-pa coiiurnbinma Cool Bunch 1.7 and One of the Following (101/4 Total) Indian Ricegrass .iclirtarhorrim [0i u_opsisj iiivirenoides .Nezpar, Palorna, Riituock Cool Bunch 1.9 Junegrass Kortler•ia macrarrtha, K. cristata Cool Bunch 0.1 *Bitted arr 60 pure live seeds (PLS') per stlnnre foot, drill - seemed. Doable this rate (120PL.S'per square foot) if broadcast or lrs-drose ded. Table 1 -4. Spruce -Fir Forest, Including Mountain -lfeadows C:otnrnoru Name Scientific Names Variety Season Form PLS lbstacre'° Plant Both of the Following (204 Each, 401/4 Total) ' Mountain Biome Broarops(s 1BrotntrsJ itrniginnrus Gannet Cool Bunch 5.8 Slender 1 beatgiass Etyma nac'hi'catihrnr San Luis Cool Bunch 3.3 and Three of the Following (201/4 Each, 601/4 Total) Leiterrllaa Iti�eedlegra °,5 .4ci?ii ither trm [S•tipa] lettermen -11i Cool Bunch 3.5 Blue tk ilds� a Elyorus glarrcus Arlington Cool Bunch Tliickspike 5L`lieatgrass Elyraiis larrceolatus sty. lanceolatrrs, .fgrapivorr danstachi ton Critana. Schwendimar Cool Sod-forming Idaho Fescue Festrrca idahoeirsis Joseph Cool Branch Wheeler Bluegrass Pon nervosa Cool Sod-forming 0.6 *Based on 60 pare live seeds (PLS) per square foot, drill-seeded. Double this rate (120 PL.Sper square foot) if broadcast or li•droseeded.