SOW and Specs 23-033 Ladd Marsh WLA Domestic Water Well Improvements.pdf

TECHNICAL SPECIFICATIONS

LADD MARSH WILDLIFE AREA

DOMESTIC WATER WELL IMPROVEMENTS

TABLE OF CONTENTS TS-i Ladd Marsh Wildlife Area Domestic Water Well Improvements Engineering Project # 23-033

TABLE OF CONTENTS

Division .... Section Title.. ...................................................................................................... Page Number

DIVISION 1 – GENERAL REQUIREMENTS

01 10 00 Summary of Work .......................................................................................................... TS-3

DIVISION 31 – EARTHWORK

31 20 00 Earthwork and Trenching ............................................................................................... TS-7

31 23 10 Site Demolition and Preparation .................................................................................... TS-17

DIVISION 33 – UTILITIES 23-24

33 21 13 Public Water Supply Wells ............................................................................................ TS-25

TECHNICAL SPECIFICATIONS

LADD MARSH WILDLIFE AREA

DOMESTIC WATER WELL IMPROVEMENTS

TABLE OF CONTENTS TS-ii

Domestic Water Well Improvements Engineering Project # 23-033

TABLE OF CONTENTS - CONTINUED

Division .... Section Title.. ...................................................................................................... Page Number

PAGE LEFT BLANK INTENTIONALLY

DIVISION 01 – GENERAL

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DIVISION 01 – GENERAL REQUIREMENTS

DIVISION 01 – GENERAL

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SUMMARY OF WORK 01 10 00

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SECTION 01 10 00 – SUMMARY OF WORK

PART 1 – GENERAL

1.1 SECTION INCLUDES

A. This section includes a general description of the Work required for this Contract.

1.2 CONTRACT DOCUMENTS

A. This Project shall be constructed in accordance with:

1. Ladd Marsh Wildlife Area – Domestic Water Well Improvements – Project Manual

2. Ladd Marsh Wildlife Area – Domestic Water Well Improvements – Construction Draw-ings.

3. Oregon Standard Specifications for Construction, Current Edition.

B. Standard Plans or Specifications, when referenced in this Project Manual, shall mean Oregon Standard Specifications for Construction, most current Edition; Volume 2; Technical Specifi-cations.

1.3 PROJECT DESCRIPTION

A. The Oregon Department of Fish and Wildlife (OWNER) plans to drill, develop, install well pump and test an approximately 300-feet-deep domestic well located on the Ladd Marsh Wildlife Area. Headquarters office is located at 59116 Pierce Road, La Grande, OR 97850.

B. The well shall be constructed with a pitless adaptor and a 60-gallon bladder pressure tank and well pump system.

C. For purposes of comparing bids: The well is expected to be completed with a 10-inch-diameter surface seal to an approximate depth of 20 feet below ground surface (bgs) and permanently cased with 6-inch-diameter min. steel casing to an approximate depth of 200 feet bgs with a yield of 10 gpm for purposes of comparing bids.

D. Location of Work:

1. The well to be constructed is located at 58725 Pierce Rd, La Grande OR 97850, which is on the Ladd Marsh Wildlife Area property.

2. Site GPS Location: 45.249847, -118.013740

E. The Contractor shall provide all necessary expertise, labor, equipment, materials, and inci-dentals.

1.4 PERMITS

A. The Contractor shall be responsible for obtaining and paying for all permits necessary to complete the Work.

1.5 SUBSTANTIAL COMPLETION

A. Substantial completion dates are listed in the ITB.

PART 2 – PRODUCTS (NOT USED)

PART 3 – EXECUTION (NOT USED)

END OF SECTION 01 10 00

SUMMARY OF WORK 01 10 00

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DIVISION 31 – EARTHWORK

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EARTHWORK AND TRENCHING 31 20 00

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SECTION 31 20 00 – EARTHWORK AND TRENCHING

PART 1 – GENERAL

1.1 SUMMARY

A. This section specifies earthwork which consists of excavation, filling, grading, trenching, imported fill materials, geotextile fabrics, stockpiling, and excess material control. Section includes:

1. Pipeline trenching and backfill.

2. Excavation and backfill for concrete structures.

B. Requirements of Regulatory Agencies:

1. Comply with all applicable requirements of local, State, and Federal agencies.

2. Comply with Oregon Occupational Safety and Health Code.

1.2 SUBMITTALS

A. Samples:

1. All imported materials proposed for the Work, seven (7) days in advance of use.

a. Quantity: 0.5 cubic feet of each type of material.

B. Disposal Site for Excavated Materials:

1. Location and owner of permitted disposal site for non-hazardous excavated material.

1.3 DEFINITIONS

A. Compaction: The degree of compaction is specified as percent compaction. Maximum or relative densities refer to soil densities obtainable at optimum moisture content.

B. Backfill: Soil material or controlled density fill material used to fill an excavation.

C. Borrow Soil: Satisfactory soil imported from off-site for use as fill or backfill.

D. Drainage Course: Aggregate layer supporting the slab-on-grade that also minimizes upward capillary flow of pore water.

E. Excavation: Removal of material encountered above subgrade elevations and to lines and dimensions indicated.

1. Authorized Additional Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions as directed by Owner’s Authorized Representative.

Authorized additional excavation and replacement material will be paid for according to Contract provisions for changes in the Work.

2. Unauthorized Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions without direction by Owner’s Authorized Representative.

Unauthorized excavation, as well as remedial Work directed by Owner’s Authorized Representative, shall be without additional compensation.

F. Fill: Soil materials used to raise existing grades.

G. Rock Excavation: Removal of boulders having a volume of 2 cubic yards or more, solid bedrock, or ledge rock that cannot be excavated or removed by dozers with rippers but requires systematic drilling or the use of pneumatic rock splitters, hammers, and wedges.

H. Structures: Footings, foundations, retaining walls, slabs, tanks, curbs, mechanical and electrical appurtenances, or other man-made stationary features constructed above or below the ground surface.

I. Subgrade: Uppermost surface of an excavation or the top surface of a fill or backfill immediately below subbase, drainage fill, drainage course, or topsoil materials.

J. Utilities: On-site underground pipes, conduits, ducts, and cables.

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1.4 PROJECT CONDITIONS

A. Trenching Protection:

1. Protect adjacent structures and surrounding areas from damage during dewatering, shoring installation and removal, excavation, drilling, and backfilling.

2. Maintain a minimum of 5 feet between shoring or edge of trench and adjacent property boundary, construction easement line or designated construction limit as shown on the Drawings.

B. Weather:

1. Do not backfill or construct fills or embankments during freezing weather.

2. Do not use frozen materials, snow, or ice in any backfill, fill area, or embankment.

3. Do not backfill or construct fill or embankments on any frozen surface.

4. Comply with wet weather working conditions recommendations provided in the

Geotechnical Report.

C. Remove and handle all excavated material regardless of its type, condition, or depth.

D. Traffic: Minimize interference with adjoining roads, driveways, and other adjacent occupied or used facilities during earth moving operations.

1. Do not close or obstruct streets, walks, or other adjacent occupied or used facilities without written permission from Owner’s Authorized Representative.

2. Provide alternate routes around closed or obstructed traffic ways if required by Owner’s

Authorized Representative.

E. Utility Locator Service: Notify utility locator service “Call Before You Dig” for area where

Project is located before beginning earth moving operations.

F. The following practices are prohibited within protection zones:

1. Storage of construction materials, debris, or excavated material.

2. Parking vehicles or equipment.

3. Foot traffic.

4. Erection of sheds or structures.

5. Impoundment of water.

6. Excavation unless otherwise indicated.

7. Attachment of signs to or wrapping materials around trees or plants unless otherwise indicated.

G. Do not direct vehicle or equipment exhaust towards protection zones.

H. Prohibit heat sources, flames, ignition sources, and smoking within or near protection zones.

PART 2 – PRODUCTS

2.1 SOIL MATERIALS

A. Drain Rock:

1. Imported, open graded, granular material with a maximum size of 1-1/2 inch and less than 2 percent passing the No. 200 sieve (washed analysis).

B. Fine Granular Material:

1. Fine granular material consisting of 1 inch-minus, well graded, angular, crushed gravel or rock, in accordance with Standard Specifications Section 02630.10.

C. Trench Bottom Stabilization Rock

1. Clean, open-graded crushed rock granular material of 3/4 to 1-1 /2 inch gradation having a nominal maximum size of 4 inch. Clean on-site sandy gravel may be acceptable for this material. Use of on-site material shall be approved by the Owner’s Authorized Representative.

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D. Pipe Bedding and Pipe Zone:

1. Clean, 3/4-minus crushed rock with less than about 5 percent passing the No. 200 sieve

(washed analysis).

E. Trench Backfill:

1. Granular material consisting of sand and gravel or crushed rock. Maximum particle size shall be 2 inch.

2. On-site sandy gravel may be acceptable for this material. Use of on-site material shall be approved by the Owner’s Authorized Representative.

F. Crushed Rock Surfacing:

1. Fine Granular Material in accordance with paragraph 2.1 B.

G. Controlled Low Strength Materials (CLSM) or Controlled Density Fill (CDF):

1. Flowable lean concrete mix meeting requirements of Oregon Department of

Transportation (ODOT) Standard Specification 00442.

H. General:

1. Provide borrow soil materials when sufficient satisfactory soil materials are not available from excavations.

I. Satisfactory Soils:

1. Soil Classification Groups GW, GP, GM, SW, SP, and SM according to ASTM D 2487 or a combination of these groups; free of rock or gravel larger than 3 inches in any dimension, debris, waste, frozen materials, vegetation, and other deleterious matter.

J. Unsatisfactory Soils:

1. Soil Classification Groups GC, SC, CL, ML, OL, CH, MH, OH, and PT according to

ASTM D 2487, or a combination of these groups.

K. Engineered Fill:

1. Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; with at least 90 percent passing a 1-1/2 inch sieve and not more than 12 percent passing a No. 200 sieve.

L. Granular Drainage Blanket:

1. Graded mixture meeting requirements of Oregon Department of Transportation (ODOT)

Standard Specification 00360.11.

2. Material may be accepted without testing if the Owner’s Authorized Representative visually determines compliance with ODOT standards.

PART 3 – EXECUTION

3.1 PREPARATION

A. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earth moving operations.

B. Protect and maintain erosion and sedimentation controls during earth moving operations.

C. Protect subgrades and foundation soils from freezing temperatures and frost. Remove temporary protection before placing subsequent materials.

3.2 DEWATERING

A. Prevent surface water and ground water from entering excavations, from ponding on prepared subgrades, and from flooding Project Site and surrounding area.

B. Protect subgrades from softening, undermining, washout, and damage by rain or water accumulation.

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C. Dewater excavations free from water during construction in accordance with the recommendations contained in the Geotechnical Report.

D. Have on hand pumping equipment and machinery in good working condition for emergency and have workers available for its operation.

E. Operate dewatering systems continuously (24 hours per day, 7 days per week) until backfill has been completed to 1 foot above the normal static groundwater.

3.3 EXPLOSIVES

A. Do not use explosives.

3.4 HAULING

A. Hauling and Traffic Patterns:

1. When hauling is done over highways or city streets trim the loads and clean the vehicle shelf areas after each loading.

2. Cover the loads after trimming to minimize dust.

3. Maintain traffic patterns in the existing structural filled areas which preserve the stability of the soil under all future structural foundations or paved areas.

B. Haul Roads:

1. Utilize existing haul roads and/or construct new haul roads as required to transport materials on site.

2. Select alignment of haul roads to avoid interference with any construction and to minimize disruption of local traffic.

3.5 EXCAVATION, GENERAL

A. Unclassified Excavation: Excavate to subgrade elevations regardless of the character of surface and subsurface conditions encountered. Unclassified excavated materials may include rock, soil materials, and obstructions. No changes in the Contract Sum or the Contract Time will be authorized for rock excavation or removal of obstructions.

1. If excavated materials intended for fill and backfill include unsatisfactory soil materials and rock, replace with satisfactory soil materials.

2. Remove rock to lines and grades indicated to permit installation of permanent construction without exceeding the following dimensions:

a. 24 inches outside of concrete forms other than at footings.

b. 12 inches outside of concrete forms at footings.

c. 6 inches outside of minimum required dimensions of concrete cast against grade.

d. Outside dimensions of concrete walls indicated to be cast against rock without forms or exterior waterproofing treatments.

e. 6 inches beneath bottom of concrete mats or slabs-on-grade.

B. Classified Excavation: Excavate to subgrade elevations. Material to be excavated will be classified as earth and rock. Do not excavate rock until it has been classified and cross sectioned by Owner’s Authorized Representative. The Contract Sum will be adjusted for rock excavation according to unit prices included in the Contract Documents.

1. Earth excavation includes excavating pavements and obstructions visible on surface;

underground structures, utilities, and other items indicated to be removed; together with soil, boulders, and other materials not classified as rock or unauthorized excavation.

a. Intermittent drilling; ram hammering; or ripping of material not classified as rock excavation is earth excavation.

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2. Rock excavation includes removal and disposal of rock. Remove rock to lines and subgrade elevations indicated to permit installation of permanent construction without exceeding the following dimensions:

a. 24 inches outside of concrete forms other than at footings.

b. 12 inches outside of concrete forms at footings.

c. 6 inches outside of minimum required dimensions of concrete cast against grade.

d. Outside dimensions of concrete walls indicated to be cast against rock without forms or exterior waterproofing treatments.

e. 6 inches beneath bottom of concrete mats or slabs-on-grade.

C. Clear and grub site areas to receive structural or surfacing improvements in accordance to Section 31 23 10 “Site Demolition and Preparation.”

D. Except as otherwise noted or specified, any method of excavation may be used which meets the intent of the Contract Documents and does not damage adjacent improvements. Material excavated may be placed adjacent to the excavation if space is available. The toe of the slope of the spoil material must be at least 2 feet from the edge of the excavation. Pile trench spoils in a manner to prevent surface water from flowing into the excavation.

E. Existing utilities of record are shown on the Drawings. These are shown for convenience only and the Owner assumes no responsibility for improper locations or failure to show utility locations on the Drawings. Protect existing utilities and infrastructure, not scheduled for demolition, from damage at all times.

F. Perform all excavation of every description and of whatever materials encountered to the depth indicated on the Drawings or specified. Make excavations by open cut in all locations, except as indicated on the Drawings. Excavate all footings and pipe trenches to true and smooth bottom grades and in accordance with the grades shown. Prepare the bottom of excavations to provide uniform bearing and support by undisturbed soil for each footing or slab on grade structure. Cobbles and boulders that would otherwise extend into the trench or footing design limits shall be removed and replaced with structural foundation stabilization material. Proof roll the top 12 inches of subgrades for pavements and building slabs.

G. Exercise sound construction practices in excavating and maintain it so that no damage will occur to any foundation, structure, pole line, pipeline, or other adjacent facility because of slough or slopes, or from any other cause. If, as a result of the excavation, there is ground deformation which may endanger other property, immediately take remedial action to correct the problem. No act, representation, or instruction of the Owner’s Authorized Representative shall in any way relieve the Contractor from liability for damages or costs that result from excavation.

H. Prior to installation of structures or bedding and pipe, bring the excavation bottom to grade as indicated for the type of bedding specified, and compact the subgrade as necessary by tamping, with mechanical compactors to provide a foundation capable of supporting the pipe in its proper position.

I. Take care not to excavate below the depth specified. If ground is excavated below the depth specified, backfill excavation below that depth with structural fill and compact as specified herein at no cost to the Owner.

J. Stockpiling of topsoil, excess material and unsuitable material at the worksite is allowed at the existing stockpile area, segregate materials by soil type.

3.6 EXCAVATION FOR STRUCTURES

A. Excavate to indicated elevations and dimensions within a tolerance of plus or minus 1 inch.

If applicable, extend excavations a sufficient distance from structures for placing and

Domestic Water Well Improvements Engineering Project # 23-033 TS-12 removing concrete formwork, for installing services and other construction, and for inspections.

1. Excavations for Footings and Foundations: Do not disturb bottom of excavation.

Excavate by hand to final grade just before placing concrete reinforcement. Trim bottoms to required lines and grades to leave solid base to receive other Work.

2. Excavation for Underground Tanks, Basins, and Mechanical or Electrical Utility Structures: Excavate to elevations and dimensions indicated within a tolerance of plus or minus 1 inch. Do not disturb bottom of excavations intended as bearing surfaces.

B. Excavations at Edges of Tree- and Plant-Protection Zones:

1. Excavate by hand to indicated lines, cross sections, elevations, and subgrades. Use narrow-tine spading forks to comb soil and expose roots. Do not break, tear, or chop exposed roots. Do not use mechanical equipment that rips, tears, or pulls roots.

2. Cut and protect roots according to requirements in Division 01 Section 31 23 10 “Site Demolition and Preparation.”

3.7 UNSUITABLE MATERIAL REMOVAL AND REPLACEMENT

A. Unsuitable materials include but are not limited to peat, soils with high organic content, and other soft, loose, saturated, and/or disturbed soils. Removal of unsuitable material below the trench bottom shall not be authorized without prior approval of the Owner’s Authorized Representative.

B. When unsuitable material is encountered at or below the trench bottom, it shall be excavated to a depth specified by the Owner’s Authorized Representative and backfilled with fill material. The material shall be placed in lifts of 8 inches maximum thickness and compacted to at least 90 percent of the maximum dry density as determined by AASHTO T-180. Each layer shall be fully compacted prior to placement of subsequent layers. The Owner’s Authorized Representative reserves the right to specify an alternate trench section in lieu of the over-excavation procedure described above.

C. Unsuitable material shall be disposed of by the Contractor within five (5) working days of the time of excavation, except in or adjacent to roadways or other improved areas where it shall be disposed of within 24 hours of excavation.

3.8 PIPELINE BEDDING

A. Where the invert of the new pipe is established in sand and gravel, favorable pipe foundation conditions should be encountered; hence, only the minimum thickness of bedding will likely be required, as approved by the Owner’s Authorized Representative. In areas where the invert will be established in cobbles and boulders, a minimum 6 inch thickness of bedding material beneath the pipe is required. It should be anticipated that some overexcavation of cobbles and boulders and subsequent backfilling will be required to provide uniform support for the pipe. The backfill placed to restore subgrade level should be firmly tamped into place prior to installing the normal bedding lift. Compact the bedding material around the pipe by the use of shovels or other approved hand-held tools, so as to provide firm and uniform support under the full length of the pipe. Compact the bedding between the pipe and trench wall using mechanical methods.

B. Take care to prevent any damage to pipe or its protective coating and to maintain the pipe within the line and grade tolerances specified in the Standard Specifications. Bedding shall be placed, compacted, and shaped to conform to the barrel of the pipe, with allowance for bells and other appurtenances, to ensure firm and continuous support for the entire length of pipe.

C. Pipe Zone: After the pipe has been installed, alignment and grade checked and the inside checked for possible obstructions, the Contractor shall backfill and compact trenches using

Domestic Water Well Improvements Engineering Project # 23-033 TS-13 pipe zone material over the pipe as shown in the Drawings, making sure the backfill is in contact with the entire periphery of the pipe. The balance of the backfill shall be placed as backfill zone material.

3.9 TRENCH BACKFILL

A. The granular backfill shall be placed in lifts and compacted to at least 95 percent of the maximum dry density as determined by ASTM D 698 to a depth of 5 feet or to a depth of 1- 1/2 times the width of the trench, whichever is deeper. Below this depth, trench backfill shall be compacted to at least 90 percent of the maximum dry density (ASTM D 698).

Compaction should be accomplished using vibratory plate compactors or tamping units.

Flooding or jetting the backfilled trenches with water to achieve the recommended compaction is not permitted.

B. Backfill above the pipe zone in such a manner that the pipe will not be shifted out of position nor damaged by impact or overloading.

3.10 SOIL FILL

A. Plow, scarify, bench, or break up sloped surfaces steeper than 1 vertical to 4 horizontal so fill material will bond with existing material.

B. Place and compact fill material in layers to required elevations as follows:

1. Under seeded and planted areas, use satisfactory soil material. Place in layers not more than 8 inches in loose depth for heavy compaction equipment and not more than 4 inches in depth for hand-operated tampers.

2. Under structural slabs and mats, use engineered fill. Place in layers not more than 12 inches in depth.

3. Under footings and foundations, use engineered fill. Place in layers not more than 12 inches in depth.

4. Under riprap slope armor, use granular drainage blanket material. Spread in layers with no layer exceeding 3 feet in depth.

5. For backfill of concrete walls, use granular drainage blanket material. Place in layers with no layer exceeding 3 feet in depth.

6. For stream bank slope armor, use loose riprap material placed on riprap geotextile.

Spread in one layer of depth indicated.

7. For stream bed construction, use streambed materials placed in one layer to elevations indicated.

C. Place soil fill materials on subgrades free of mud, frost, snow, or ice.

3.11 COMPACTION OF SOIL BACKFILLS AND FILLS

A. Place backfill and fill soil materials evenly on all sides of structures to required elevations, and uniformly along the full length of each structure.

B. Compact soil materials to not less than the following percentages of maximum dry unit weight according to ASTM D 698:

1. Under structures, slabs, mats and pavements compact the top 12 inches of each layer of backfill or fill soil material at 95 percent.

2. Under seeded or unpaved areas, compact the top 12 inches of backfill or fill soil material at 85 percent.

C. Do not compact the following soil materials:

1. Granular drainage blanket material spread on stream bank slopes beneath loose riprap armor.

2. Granular drainage blanket material placed as backfill for structural walls.

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3. Loose riprap spread on stream banks as slope armor over geotextiles.

4. Streambed material placed in the stream.

3.12 COMPACTION TESTING

A. Pipe bedding and backfill: 1 ea. per 500 feet of pipe or 1 minimum per trench B. Pavement Subgrades and Bases: 1 test per lift of material, per 1,000 square feet.

C. Embankment, where required, and Structural Fill: 1 test per lift of material, per 1,000 square feet.

3.13 GRADING

A. General: Uniformly grade areas to a smooth surface, free of irregular surface changes.

Comply with compaction requirements and grade to cross sections, lines, and elevations indicated.

1. Provide a smooth transition between adjacent existing grades and new grades.

2. Cut out soft spots, fill low spots, and trim high spots to comply with required surface tolerances.

B. Site Rough Grading: Slope grades to direct water away from structures and to prevent ponding. Finish subgrades to required elevations within the following tolerances:

1. Turf or Unpaved Areas: Plus or minus 1 inch

2. Pavements: Plus or minus 1/2 inch.

3. Structures: Plus or minus 1 inch.

4. Stream Banks: Plus or minus 3 inches.

5. Streambed: Plus or minus 3 inches.

C. Grading inside Structure Lines: Finish subgrade to a tolerance of 1/2 inch when tested with a 10 foot straightedge.

D. Roadway and Parking Grading: Finish ordinarily obtainable from a blade-grader operation, but not more than 0.1 foot above or below the established grade.

3.14 GEOTEXTILE FABRIC

A. Install material following manufacturer’s recommendations.

B. Install Riprap Geotextile according to ODOT Standard Specifications Section 00390.41.

3.15 FIELD QUALITY CONTROL

A. Earthwork Inspections: Owner’s Authorized Representative will provide a qualified inspector to perform the following inspections –

1. Determine prior to placement of fill that site has been prepared in compliance with requirements.

2. Determine that fill material and maximum lift thickness comply with requirements.

3.16 PROTECTION

A. Protecting Graded Areas: Protect newly graded areas from traffic, freezing, and erosion.

Keep free of trash and debris.

B. Repair and reestablish grades to specified tolerances where completed or partially completed surfaces become eroded, rutted, settled, or where they lose compaction due to subsequent construction operations or weather conditions.

C. Where settling occurs before Project correction period elapses, remove finished surfacing, backfill with additional soil material, compact if required, and reconstruct surfacing.

1. Restore appearance, quality, and condition of finished surfacing to match adjacent Work, and eliminate evidence of restoration to greatest extent possible.

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3.17 DISPOSAL OF SURPLUS AND WASTE MATERIALS

A. Remove surplus satisfactory soil and waste materials, including unsatisfactory soil, trash, and debris, and legally dispose of them off Owner’s property.

B. Transport surplus satisfactory soil to designated storage areas on Owner’s property.

Stockpile or spread soil as directed by Owner’s Authorized Representative.

1. Remove waste materials, including unsatisfactory soil, trash, and debris, and legally dispose of them off Owner’s property.

END OF SECTION 31 20 00

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SITE DEMOLITION AND PREPARATION 31 23 10

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SECTION 31 23 10 – SITE DEMOLITION AND PREPARATION

PART 1 – GENERAL

1.1 SECTION INCLUDES

A. Work specified in this Section includes, but is not necessarily limited to, the following:

1. Demolition and removal of portion of reinforced concrete structure and related site im-provements.

2. Removing below-grade construction.

3. Filling or removal of underground pipes.

4. Disconnecting, capping or sealing, abandoning in-place and removing site utilities

5. Filling voids in subgrade as a result of demolition work.

6. Removing and disposing of vegetation, duff, organics, or other unwanted materials from the ground surface.

7. Protecting existing vegetation to remain.

8. Stripping and stockpiling topsoil.

9. Removing materials from the site.

10. Removing designated trees and protecting from harm any trees or other objects selected to remain.

11. Temporary erosion- and sedimentation-control measures.

B. Related Sections:

1. Section 01 10 00 – Summary of Work: for use of the premises and phasing requirements.

1.2 DEFINITIONS

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

B. Subsoil: All soil beneath the topsoil layer of the soil profile and typified by the lack of organic matter and soil organisms.

C. Surface Soil: Soil that is present at the top layer of the existing soil profile at the Project site.

In undisturbed areas, the surface soil is typically topsoil; but in disturbed areas such as urban environments, the surface soil can be subsoil.

D. Topsoil: Top layer of the soil profile consisting of existing native surface topsoil or existing in-place surface soil and is the zone where plant roots grow.

E. Tree-Protection Zone: Area surrounding individual trees or groups of trees to be protected during construction and indicated on Drawings.

F. Vegetation: Trees, shrubs, groundcovers, grass, and other plants.

1.3 MATERIALS OWNERSHIP

A. No historic items are anticipated to be encountered on this Project. Should historic items, relics, and similar objects including, but not limited to, cornerstones and their contents, commemora-tive plaques and tablets, antiques, and other items of interest or value to the Owner that may be encountered during site preparation shall remain the Owner's property. Carefully remove and salvage each item or object in a manner to prevent damage and deliver promptly to the Owner’s Authorized Representative.

B. Unless otherwise indicated, demolition waste becomes property of Contractor.

C. Except for stripped topsoil and other materials indicated to be stockpiled or otherwise remain

Owner's property, cleared materials shall become Contractor's property and shall be removed from Project site.

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1.4 SUBMITTALS

A. Existing Conditions: Documentation of existing trees and plantings, adjoining construction, and site improvements that establishes preconstruction conditions that might be misconstrued as damage caused by site clearing.

1. Use sufficiently detailed photographs or video.

2. Include plans and notations to indicate specific wounds and damage conditions of each tree or other plants designated to remain.

B. Record Drawings: Identifying and accurately showing locations of capped utilities and other subsurface structural, electrical, and mechanical conditions.

C. Procedures and operational sequence for review and acceptance by the Owner’s Authorized

Representative. Include:

1. Permits for transport and disposal of debris as required.

D. Proposed Protection Measures: Submit informational report, including Drawings, that indi-cates the measures proposed for protecting individuals and property, for environmental protec-tion, for dust control and for noise control. Indicate proposed locations and construction of barriers.

E. Schedule of Structure Demolition Activities: Indicate the following:

1. Detailed sequence of demolition Work, with starting and ending dates for each activity.

2. Temporary interruption of utility services.

3. Shutoff and capping or re-routing of utility services.

F. Pre-demolition Photographs or Video: Show existing conditions of adjoining residences, con-struction and site improvements, including landscaping and finish surfaces that might be mis-construed as damage caused by demolition operations.

G. Qualifications: Previous experience record of general Contractor and specialty sub-contractors for environmentally sensitive in-stream demolition, earthwork and construction operations.

1.5 QUALITY ASSURANCE

A. Regulatory Requirements: Comply with governing EPA notification regulations before begin-ning demolition. Comply with hauling and disposal regulations of authorities having jurisdic-tion.

B. Standards: Comply with ANSI/ASSE A10.6 and NFPA 241.

C. Pre-demolition Conference: Conduct conference at Project site.

1. Inspect and discuss condition of construction to be demolished.

2. Review and finalize structure demolition schedule and verify availability of demolition personnel, equipment, and facilities needed to make progress and avoid delays.

3. Review and finalize protection requirements.

4. Review procedures for noise control and dust control.

5. Review procedures for protection of adjacent residences.

6. Review items to be removed and salvaged by Owner. Owner intends to salvage existing grip strut walkway planks from the structure prior to Award of Contract.

7. Review items to be removed and salvaged by Contractor to be reinstalled (i.e., light pole, Waterman gates, fence posts).

1.6 PROJECT CONDITIONS

A. Structures to be demolished will be abandoned and their use discontinued before start of the

Work.

B. Hazardous Materials: It is not expected that hazardous materials will be encountered in the

Work.

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C. Utility Locator Service: Notify utility locator service “Call Before You Dig” for area where Project is located before site clearing.

1.7 COORDINATION

A. Arrange demolition schedule so as not to interfere with Owner’s on-site operations or continued occupancy of adjacent residences.

1.8 DIMENSIONS AND LAYOUT

A. The Contractor shall be responsible for fencing the construction area and resetting fencing to accommodate changes in the construction area.

B. All Work, materials, methods, and personnel shall be subject to approval by the Owner’s Au-thorized Representative prior to commencing construction and on a continuing basis for each phase requiring accuracy control.

C. The Contractor is responsible for preserving all benchmarks and stakes and replacing any that are displaced or missing as a result of the Contractor’s operations.

D. The Contractor shall be responsible for locating all underground utilities prior to beginning any excavation or underground demolition.

PART 2 – PRODUCTS

2.1 SOIL MATERIALS

A. Satisfactory Soil Material: Requirements for satisfactory soil material are specified in Section

31 20 00 “Earthwork and Trenching.”

1. Obtain approved borrow soil material off-site when satisfactory soil material is not availa-ble on-site.

PART 3 – EXECUTION

3.1 DEMOLITION CONTRACTOR

A. Demolition Contractor: Experienced and qualified for environmentally sensitive in-stream demolition operations.

3.2 EXAMINATION

A. Verify clearing and grubbing and site features and site structures to be removed and demol-ished.

B. Verify that utilities have been disconnected and capped before starting demolition operations.

C. Review Project Record Documents of existing construction provided by Owner. Owner does not guarantee that existing conditions are same as those indicated in Project Record Documents.

3.3 PREPARATION

A. Protect and maintain benchmarks and survey control points from disturbance during construc-tion.

B. Locate and clearly identify trees to remain. Wrap a 1 inch blue vinyl tie tape flag around each tree trunk at 54 inches above the ground.

C. Protect existing site improvements to remain from damage during construction.

1. Restore damaged improvements to their original condition, as acceptable to Owner.

D. Existing Utilities: Locate, identify, disconnect, and seal or cap off indicated utilities serving structures to be demolished.

E. Dewatering: Install dewatering facilities to control groundwater.

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3.4 EXISTING CONDITIONS

A. Existing Residences: Protect adjacent residential driveways, carports, doorways, walkways, and other residential facilities during demolition operations. Maintain exits continuously from existing residences.

B. Temporary Protection: Erect temporary protection such as chain link metal or wood fences where required by Owner and as indicated. Comply with requirements in Section 01 50 00 “Temporary Facilities and Controls.”

1. Protect existing site improvements, appurtenances, trees and landscaping to remain.

2. Erect a plainly visible fence around drip line of individual trees or around perimeter drip line of groups of trees to remain.

3. Provide temporary barricades and other protection required to prevent injury to people and damage to adjacent residences.

4. Provide protection to ensure safe passage of people around structure demolition area and to and from occupied adjacent residences.

C. Do not shut off or cap utilities without prior notice. Maintain storm drains open for free drain-age:

1. Provide filter fabric at catch basins.

D. Remove temporary barriers and protections where hazards no longer exist. Where open exca-vations or other hazardous conditions remain, leave temporary barriers and protections in place.

3.5 CLEARING AND GRUBBING

A. General: Clear and Grub or otherwise prepare areas to receive construction or other improve-ments.

1. Excavate and remove all stumps to a depth of 3 feet below existing grade or proposed subgrade, whichever is lower.

2. Excavate and remove roots larger than 1 1/2 inches in diameter, rocks greater than 2 inch in any dimension, boulders, any asphalt and concrete paving and reservoir lining material, as well as other unsuitable materials.

3. Remove topsoil, sod, duff, organics, and loose or soft soils.

4. Use only hand methods for grubbing within protection zones.

5. Chip removed tree branches and dispose of off-site.

B. Fill depressions caused by clearing and grubbing operations with satisfactory soil material un-less further excavation or earthwork is indicated.

3.6 TOPSOIL STRIPPING

A. Remove sod and grass before stripping topsoil.

B. Strip topsoil to depth of 6 inches in a manner to prevent intermingling with underlying subsoil or other waste materials.

1. Remove subsoil and nonsoil materials from topsoil, including clay lumps, gravel, and other objects more than 2 inches in diameter; trash, debris, weeds, roots, and other waste mate-rials.

C. Stockpile topsoil away from edge of excavations without intermixing with subsoil. Grade and shape stockpiles to drain surface water. Cover to prevent windblown dust and erosion by water.

1. Limit height of topsoil stockpiles to 72 inches.

2. Do not stockpile topsoil within protection zones.

3. Dispose of surplus topsoil. Surplus topsoil is that which exceeds quantity indicated to be stockpiled or reused.

4. Stockpile surplus topsoil to allow for respreading deeper topsoil.

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3.7 TREE AND SHRUB PROTECTION

A. Provide tree and shrub protection as follows:

1. Include barricades and/or fencing and other protection for trees and shrubs indicated on the Drawings and directed by the Owner’s Authorized Representative to be saved and pro-tected.

2. Maintain existing grade within root protection zone of trees unless otherwise indicated.

3.8 SITE DEMOLITION

A. General: Demolish indicated structures and site improvements completely. Use methods re-quired to complete the Work within limitations of governing regulations B. Engineering Surveys: During demolition, perform surveys to detect hazards that may result from structure demolition activities.

C. Site Access and Temporary Controls: Conduct structure demolition and debris-removal oper-ations to ensure minimum interference with roads, streets, walks, walkways, and adjacent oc-cupied residences.

D. Explosives: Use of explosives is not permitted.

E. Proceed with demolition of structural components systematically, from higher to lower level.

F. Below-Grade Construction: Demolish completely concrete foundation walls, footings, slabs, mats and other below-grade construction.

G. Sprinkle debris with water as necessary to limit dust to lowest practicable level. Do not use water to extent causing flooding, contaminated runoff, or icing.

H. Utilities: Fill all piping to be abandoned in place with sand, CDF, or lean concrete. Remove all piping designated for removal, including underground piping and exposed piping.

1. Piping:

a. Some utility piping and structures are to remain until new services are in operation and shall be protected during construction. Damage to existing utilities, which are to re-main, shall be repaired at no additional cost to the Owner.

b. In the event the Contractor encounters utility lines not shown on the Drawings or oth-erwise indicated to be saved, removed, or abandoned, the location of such lines shall be marked in the field and the Owner’s Authorized Representative notified.

2. Existing utility lines, structures, and meters serving other properties shall remain in opera-tion unless otherwise shown. Protect and support lines and meters from damage and move-ment.

3.9 DISPOSAL OF MATERIALS

A. The refuse resulting from site preparation shall be disposed by the Contractor in a manner consistent with all government regulations.

1. No burning permitted.

2. Do not leave refuse material on the Project Site, shoved onto abutting private properties, or buried in embankments or trenches on the Project Site.

3. Do not deposit debris in stream, body of water, street or alley, or upon private property except by written consent of the private property owner.

4. Maintain hauling routes clean and free of debris resulting from Work of this Section.

3.10 SITE RESTORATION

A. Below-Grade Areas: Completely fill below-grade areas and voids resulting from structure demolition operations with satisfactory soil materials according to backfill requirements in Section 31 20 00 “Earthwork and Trenching.”

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B. Site Grading: Uniformly rough grade area of demolished construction to a smooth surface, free from irregular surface changes. Provide a smooth transition between adjacent existing grades and new grades.

3.11 REPAIRS

A. Promptly repair damage to adjacent residences caused by demolition operations.

3.12 CLEAN-UP

A. Upon completion of the Work of this Section, remove all rubbish, trash, and debris resulting from operations.

B. Remove equipment and tools; leave the site in a neat and orderly condition acceptable to the

Owner’s Authorized Representative.

END OF SECTION 31 23 10

DIVISION 33 – UTILITIES

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33 21 13 PUBLIC WATER SUPPLY WELLS

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SECTION 33 21 13 – PUBLIC WATER SUPPLY WELLS

PART 1 – GENERAL

1.1 DESCRIPTION

A. Construct water well(s) as specified in section 011000 Scope of Work, to provide sufficient supply for the population of the facility. The well construction and water well capacity shall be based on the allowable safe yield of the new well determined by a well yield/pump test as described in accordance with Oregon Administrative Rules (OAR) Chapter 690, “Administrative Rules for Water Supply Well Construction and Maintenance Standards and American Water Works Association (AWWA) A100-90, “Water Wells”, latest version. The new well site shall be at a location approved by the Owner’s Authorized Representative. The new well site shall be no closer than 100 feet from any existing wells.

1.2 SCOPE

A. This Section includes furnishing all labor, equipment, materials, tools, and services required to drill, sample, case, develop, seal, test, disinfect and installation of well pump and piping and electrical, and connections to existing services.

B. The purpose of this Work is to drill, construct, and test a well for the Owner as a domestic water supply. The target drilling depth is 300 feet with a yield of 10 gpm for the purposes of comparing bids. The well shall be completed in accordance with all Oregon Water Resources Department minimum well construction standards in effect at the time the bid is submitted to the Owner.

C. It is the intent and purpose of these Specifications to drill and construct a groundwater well that penetrates suitable water-bearing zone(s) capable of delivering a long-term yield, and then to test the same formation for water quality and quantity, for the least practical cost to the Owner.

D. The Work shall include, but is not limited to, the following:

1. Mobilize equipment and crews to site and complete operations.

2. Drill, sample and case the geologic formation to the required depths.

3. Install casing and complete a surface seal to the required depths.

4. Install permanent casing to the required depths.

5. Develop the well.

6. Conduct pumping tests and collect water samples.

7. *** Abandon the well if water quantity or quality is unacceptable and if directed by the

Owner.

8. Furnish and install well pump, drop piping, and electrical conductors, and connect to existing water system.

9. Clean and disinfect the well.

10. Collect and submit required water quality tests. Repeat until passed.

11. Cleanup the drill site and demobilize equipment and crews from site.

E. All Work under this Section shall be performed in accordance with approved trade standards and all equipment installed as recommended by the manufacturer.

F. Except as modified herein, the well shall be drilled and completed in accordance with Oregon Administrative Rules (OAR) Chapter 690, “Administrative Rules for Water Supply Well Construction and Maintenance Standards and American Water Works Association (AWWA) A100-90, “Water Wells.”

G. If, during construction, the Contractor becomes aware of any conditions in these

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Specifications or direction from the Owner’s Authorized Representative that would conflict with meeting the above-referenced Oregon Water Resources Department minimum well construction standards in effect at the time of the Work, the Contractor shall promptly advise the Owner’s Authorized Representative of this conflict. Depending on circumstances, the Owner may direct the Contractor to apply to the Oregon Water Resources Department for a waiver or variance of the standards. In no way shall the Owner or Owner’s Authorized Representative be responsible for the Contractor’s failure to construct the well to Oregon Water Resources Department minimum well construction standards or to the requirements of any waiver or variance approved by the Oregon Water Resources Department. Correction of any conditions not meeting the standards or requirements of any approved waiver or variance shall be completed at no expense to the Owner.

1.3 SUBMITTALS

A. Submittals shall be in accordance with the requirements of these Contract Documents and shall include that information outlined below.

B. Prior to mobilization to the site, the following information shall be submitted to the Owner’s

Authorized Representative.

1. Copy of the Contractor’s current Water Well Constructor License issued by the Oregon

Department of Water Resources.

2. Copies of all permits, registrations, and notifications required by agencies having jurisdiction.

3. Description of drill rig(s) and major equipment to be provided.

4. Proposed Project schedule.

5. Proposed Well pump, pressure tank (if applicable), and control panel.

6. Drilling report and test logs as specified.

7. Water Well Report and Water quality Report from samples.

PART 2 – PRODUCTS

2.1 PERSONNEL AND DRILLING EQUIPMENT

A. The Contractor shall supply capable and experienced personnel and suitable drilling equipment and test pumping equipment to perform this Work.

2.2 DRILLING FLUID

A. No drilling fluids shall be used except for clean, potable water, unless otherwise authorized by the Owner’s Authorized Representative.

2.3 WELL CASING

A. All permanent casings shall be new steel pipe, seamless or welded, in conformance with

American Society for Testing and Materials (ASTM) A-53A or B specifications for steel pipe.

B. The casing diameter specified or shown on the Drawings shall be interpreted as the minimum allowable inside diameter of the well casing. Unless otherwise specified, the inside diameter of the casing shall not be less than the nominal diameter specified.

C. All well casing and liner joints shall be fully penetrating welds. All welds shall be at least equal in thickness and tensile strength to the original casing.

D. All steel casings shall have the following minimum wall thickness (see table below). It shall be the Contractor’s responsibility to verify that the strength of the casing is sufficient to withstand all installation, casing pull back and grouting operations.

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