31 73 00.pdf

Emsworth L/D - Back Channel Left Abutment Stabilization and Scour Protection

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 73 00

UNDER APRON GROUTING

PART 1 GENERAL

1.1 SUMMARY

1.2 REFERENCES

1.3 SYSTEM DESCRIPTION

1.4 SUBMITTALS

1.5 QUALIFICATIONS

1.6 PROJECT/SITE CONDITIONS

PART 2 PRODUCTS

2.1 GROUT MATERIALS

2.1.1 Water

2.1.2 Cement

2.1.3 Sand

2.1.4 Admixtures

2.1.5 Mineral Filler

2.1.6 Fluidifier

2.1.7 Grouting Material Samples

2.2 PIPE AND FITTINGS

PART 3 EXECUTION

3.1 EQUIPMENT

3.1.1 Drilling Equipment

3.1.2 Grouting Equipment

3.1.2.1 Cement Grouting Equipment

3.1.3 Field Mix Design Testing

3.1.4 Other Mix Designs

3.2 GROUT, DRAINAGE, AND VENT HOLES

3.2.1 Embedded Pipe

3.2.2 Grout Hole Drilling

3.2.3 Vent Hole Drilling

3.3 GROUTING PROCEDURES

3.3.1 Grouting Pressures

3.3.2 Grout Mixes

3.3.3 Backfilling of Dam Apron Holes

3.3.4 Equipment Arrangement and Operation

3.3.5 Waste Water and Grout

3.4 COMMUNICATIONS

3.5 RECORDS

3.6 CONTRACTOR QUALITY CONTROL

3.7 ENVIRONMENTAL RESTRICTIONS

-- End of Section Table of Contents --

SECTION 31 73 00 Page 1 W911WN-10-B-0006 Added by Amendment 0001

SECTION 31 73 00

UNDER APRON GROUTING

PART 1 GENERAL

1.1 SUMMARY

This work shall consist of the work associated with the grouting beneath the existing dam apron. It shall include the drilling of vent holes and grout holes through the apron; the furnishing, handling, transporting, storing, mixing, and injecting of the grouting materials; the backfilling of the vent holes and finished grout holes; the care and disposal of drill cuttings; the handling of wastewater and waste grout; the clean up of the areas upon completion of the work; and all other operations considered incidental to the work discussed herein. The work shall be performed to the approximate locations, limits, and details as directed by the Contracting Officer.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASME INTERNATIONAL (ASME)

ASME B16.3 (1998) Malleable Iron Threaded Fittings

ASME B16.5 (2003) Pipe Flanges and Flanged Fittings

ASME B16.9 (2003) Factory-Made Wrought Steel Buttwelding Fittings

ASTM INTERNATIONAL (ASTM)

ASTM A 53/A 53M (2007) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM C 117 (2004) Standard Test Method for Materials Finer than 75-um (No. 200) Sieve in Mineral Aggregates by Washing

ASTM C 136 (2006) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM C 150 (2007) Standard Specification for Portland Cement

ASTM C 494/C 494M (2008a) Standard Specification for Chemical Admixtures for Concrete

ASTM C 618 (2008a) Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

SECTION 31 73 00 Page 2

ASTM C 937 (2002) Grout Fluidifier for Preplaced-Aggregate Concrete

ASTM C 939 (2002) Flow of Grout for Preplaced-Aggregate Concrete (Flow Cone Method)

ASTM C 940 (1998a; R 2003) Expansion and Bleeding of Freshly Mixed Grouts for Preplaced-Aggregate Concrete in the Laboratory

ASTM C 942 (1999; R 2004) Compressive Strength of Grouts for Preplaced-Aggregate Concrete in the Laboratory

U.S. ARMY CORPS OF ENGINEERS (USACE)

COE CRD-C 400 (1963) Water for Use in Mixing or Curing Concrete

EM 1110-1-3500 (1995) Chemical Grouting

EM 1110-2-2901 (1997) Tunnels and Shafts in Rock

EM 1110-2-3506 (1984) Grouting Technology

1.3 SYSTEM DESCRIPTION

The work consists of drilling vertical vent holes and grout holes as directed and performing grouting. The elevation of the existing dam apron is 693.0 feet and the designed thickness is five feet. Drilling equipment shall be permitted on the apron, provided the apron is protected from damage resulting from the drilling equipment using timbers or another equivalent means and that the bearing pressure exerted by the drilling equipment does not exceed 600 pounds per square feet. The timber matting system may be used to distribute bearing pressures. Approximately five vertical feet of soils beneath the existing concrete dam apron is proposed for grouting; these soils fill in the spaces between rows of horizontal cribbing, which extends an additional five vertical feet beneath the apron. The purpose of the grouting is to fill in void spaces and indices;

it is not intended to create a near solid or monolithic structure.

Grouting operations of vent holes and grout holes shall only be performed in a manner that meets the construction sequence phasing approach and Government safety requirements. The Contractor shall follow the grout bag staging phasing plan as shown in the drawings.

Vent drilling may be required to define problem areas or verify results ahead of the grouting operations. Grouting mixes, pressures, pumping rates, the sequence in which holes are drilled and/or grouted, and the total amount of drilling and grouting required is not known and will be determined by conditions encountered as the work progresses. Work under this section shall be be performed in accordance with EM 1110-1-3500, EM 1110-2-2901, and EM 1110-2-3506.

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

SECTION 31 73 00 Page 3 submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Grout Plant Plan; G|RE

A detailed plan shall be submitted showing equipment and grout plant layout proposed for mixing and placing grout.

SD-02 Shop Drawings

Drilling Operations Cement Grouting Operations

Submit duplicate records of all grout hole and vent hole drilling operations, all pressure washing and pressure testing operations, and all cement grouting operations. The Government must receive the originals of all such records before final payment will be processed.

SD-03 Product Data

Drilling Equipment; G|RE Grouting Equipment; G|RE

Details and data on the drilling and grouting equipment shall be submitted for conformance with the requirements of paragraph "Equipment".

Admixtures

Product data sheets for all admixtures used in the mix designs shall be submitted with the mix designs.

SD-04 Samples

Grouting Material Samples; G|RE

Samples of grouting material for Government testing and approval.

SD-05 Design Data

Grout Mixes; G|RE

Mix designs of the grout mixes to be used shall be submitted as described in paragraph "Grout Mixes".

SD-06 Test Reports

Grout Materials; G|RE

Reports of the test results of the sand to be used in the grout shall be submitted according to paragraph "Sand".

Field Mix Design Testing; G|RE

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Results of field mix design testing shall be submitted as described in paragraph "Field Mix Design Testing".

SD-07 Certificates

Qualifications

Submit evidence that the grouting specialist or grouting foreman has had at least 10 years experience on similar grouting projects of the magnitude discussed and under the subsurface conditions stated.

1.5 QUALIFICATIONS

Grouting shall be performed by a specialty Contractor or subcontractor experienced and competent in both cement and chemical grouting. All grouting work shall be done under the direct field supervision of a qualified grouting specialist or grouting foreman whose qualifications have been provided to the Contracting Officer. The foreman or specialist shall supervise the performance of the work in compliance with these specifications.

1.6 PROJECT/SITE CONDITIONS

The program described is based on currently available information.

Conditions encountered during construction may require additions or deletions. Subsurface soil data logs are shown on the drawings. The subsurface investigation report and samples of materials, as taken from subsurface investigations, may be available for examination. The Contractor shall be prepared for any changes in the geology from the current known conditions. The grouting program shall not be modified or curtailed as a construction expediency. It is a required part of design and shall not become secondary to any time or scheduling restrictions.

Grouting mixes, pressures, injection rate, and the sequence in which the holes are drilled and grouted will be determined in the field and shall be as directed.

PART 2 PRODUCTS

2.1 GROUT MATERIALS

Grout shall be of a non-shrink type and shall be composed of water, cement, and fluidifier with shrinkage compensators (expanding agents). Sand, admixtures to vary grout properties, and mineral fillers shall also be used as specified or approved. The grout mixes shall be designed by the Contractor and approved by the Contracting Officer, and shall vary to meet the characteristics of each hole or situation as determined by the conditions encountered. The grout mixture shall be designed to expand 3 to 5 percent when tested in accordance with ASTM C 940. Grout flow time-of-efflux, when tested in accordance with ASTM C 939, shall be between 10 and 30 seconds. The unconfined compressive strength of the solidified grout shall range between 2,000 psi and 3,000 psi when tested in accordance with ASTM C 942. The various materials furnished shall conform to the following paragraphs.

2.1.1 Water

The water used in the grout shall be furnished by the Contractor. It shall be fresh, clean, and free from injurious amounts of sewage, oil, or organic

SECTION 31 73 00 Page 5 matter and injurious amounts of acid, alkali, and salts or other damaging substances as determined by COE CRD-C 400. The Contractor shall conduct applicable water testing and certification that the water is suitable for use in the grout. The tailwater must be filtered to remove debris prior to use in grout. Water for the grout shall come from the same source used in the field test mixes.

2.1.2 Cement

Cement used in grout shall conform to the requirements of ASTM C 150, Type I Portland cement. Storage of cement shall be as directed by the Contracting Officer. The Contractor shall employ methods of handling, transporting, and storage that are satisfactory to the Contracting Officer. Only cement furnished in cloth or paper bags will be accepted for use in the work, unless bulk cement is approved. A sufficient quantity of cement shall be stored at or near the site of the work to ensure that grouting operations will not be delayed due to shortage of cement. Care shall be taken in storage and handling to protect the cement from contamination and moisture. In the event the cement contains lumps or foreign matter that will not pass through a standard No. 100 mesh screen, the cement shall be removed from the worksite and replaced at no cost to the Government.

2.1.3 Sand

Sand for grout shall consist of hard, tough, durable, uncoated particles.

It may be composed of natural sand, manufactured sand, or a combination of natural and manufactured sand. The shape of the particles shall be generally rounded or cubical and shall not contain more than 5 percent of flat or elongated pieces having a maximum dimension in excess of five times the minimum dimension. If the sand is a combination of separately processed sizes, classification, or a combination of natural and manufactured sands, the different components shall be batched separately or, subject to written approval, blended prior to delivery to the mixing plant. The sand shall be well graded from fine to coarse and the gradation, as determined in accordance with ASTM C 136 and ASTM C 117, shall conform to the following requirements:

SIEVE DESIGNATION CUMULATIVE PERCENTAGE BY WEIGHT

(U.S. STANDARD SQUARE MESH) PASSING RETAINED

No. 8 100% 0% No. 16 95%-100% 0%-5% No. 30 60%-85% 15%-40% No. 50 20%-50% 50%-80% No. 100 10%-30% 70%-90% No. 200 0%-5% 95%-100%

In addition to the grading limits shown, all sand used in the work shall have a fineness modulus within the range of 1.50 to 2.00. The grading of the sand, as delivered to the mixes during any 24 hour period of operation, shall be controlled so that the fineness modulus of samples taken will not vary more than 0.10 from the average fineness modulus. The results of previous tests and the service record may be used to determine the acceptability of the sand. Sand shall be stored in a manner to facilitate drainage and avoid the inclusion of any foreign materials in the grout.

The storage piles shall be constructed to prevent segregation and contamination.

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2.1.4 Admixtures

An admixture is any material other than water, sand, and cement added to the grout immediately before or during its mixing to alter its chemical or physical properties to a desired characteristic during its fluid or plastic state. Admixtures shall conform to ASTM C 494/C 494M at the time of acceptance testing sample submittal, and the Contractor shall furnish certification from the manufacturer that the material meets all the requirements of these specifications. All admixtures to be used in each batch of grout shall be separately packaged and weighed prior to use.

Accelerator additive shall be calcium chloride (CaCl2) in amounts up to 2 percent (2%) of the cement by weight, or an approved product manufactured for the specific purpose of accelerating grout setup time. The calcium chloride shall be granular or flaked and added to the grout by dissolving it in a portion of the mix water.

2.1.5 Mineral Filler

Fillers used in grout, as replacement for a portion of the cement, shall be fly ash composed of finely divided siliceous residue and in accordance with ASTM C 618, Class F. If the Contractor proposes to use fly ash in the grout mix, it shall conform to the requirements of Section 03 31 01.00 10 CONCRETE AND OTHER CONCRETE SECTIONS. The source, type, and quality of the fly ash requires the Contracting Officer's approval before incorporation into the grout mix. The maximum amount of fly ash should not exceed 30 percent (30%) of the cement by weight.

2.1.6 Fluidifier

Fluidifier shall be a compound possessing characteristics which will increase the flowability of the mixture, assist in dispersal of the cement grains, and neutralize the setting shrinkage of the grout. The quality of the material shall meet the requirements specified in ASTM C 937. Sampling of fluidifier shall be done by an authorized representative of the Contracting Officer. Trial mixtures should be tested prior to using the materials in field work. All tests will be made by and at the expense of the Government.

2.1.7 Grouting Material Samples

The Contractor shall ship grouting material samples for acceptance laboratory testing to a laboratory approved by the Government. The samples shall include:

a. 5 sacks (or 470 pounds) of cement.

b. 150 pounds of mineral filler.

c. 5 pounds of additive(s).

d. 1 cubic yard of sand.

e. 1 gallon of chemical grout (to include reactant and catalyst).

Each sample shall be from the manufacturer or supplier and representative of the materials to be used in the work, or from the shipment received at the worksite. Shipment shall be made to permit arrival at the lab 28 calendar days before the earliest start of grouting. Any substitution of materials after mix design is approved will require a new mix design and an additional 28 days. The Contractor shall state the intended grout pumping temperature range. Grout mixes will be designed and approved only for the stated temperature range.

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2.2 PIPE AND FITTINGS

All pipe shall conform to ASTM A 53/A 53M standard weight. The fittings shall be Type I malleable iron in accordance with ASME B16.3, ASME B16.5, and ASME B16.9, Class 150. Pipe shall be black steel of the diameter as directed.

PART 3 EXECUTION

3.1 EQUIPMENT

Drilling and grouting equipment shall be of a type, capacity, and mechanical condition suitable for the work, as approved by the Contracting Officer. Power, compressed air, all other equipment, and the layout thereof shall meet the requirements of local, State, and Federal regulations and codes, both with respect to safety and otherwise.

3.1.1 Drilling Equipment

Standard drilling equipment of the rotary, percussion, or rotary-percussion type shall be used to perform grout hole and vent hole drilling as described herein. The equipment shall be of a type and condition that will allow a drilling rate which will not delay the work and will be adequate to maintain an alignment within a tolerance of 4 percent or less of the depth. All drilling equipment shall be properly maintained and a sufficient supply of bits, tools, and spare parts shall be kept at the job site to avoid delays. In the case of equipment breakdown, repairs shall be made promptly.

3.1.2 Grouting Equipment

3.1.2.1 Cement Grouting Equipment

The grout plant shall be capable of supplying, mixing, stirring, and pumping the grout as specified and shall be as approved in the Grout Plant Plan. It shall be maintained in first class operating condition at all times, and any grout hole lost or damaged due to mechanical failure of equipment or inadequacy of grout supply shall be replaced at no expense to the Government. Grouting equipment to be furnished shall include the following:

a. Air or electrically powered grout pump(s) of the progressive cavity (helical screw) type that is free of surging are capable of pumping a great range of grout consistencies, provide close control of pumping pressures and variable rates of injection, and can be easily and quickly serviced during grouting operations. A minimum of one spare grout pump and spare pump parts shall be available onsite during all grouting operations.

b. Grout mixers either mechanically driven, high-speed, shear-type tub mixers with either vertical or horizontal drum, or high-speed colloidal mixers. Mixers shall be capable of effectively mixing and stirring a capacity of at least 4 cubic feet of grout with water to cement ratios from 0.6:1 to 6.0:1 and achieve mixing by constant rapid circulation of grout. The mixer shall be equipped with a suitable volume-measuring water metering device for batching water for the grout mix. The water meter shall be calibrated to read in cubic feet to the nearest tenth and designed in a manner that, after each delivery, the hands can be conveniently set back to zero. The water meter shall have a

SECTION 31 73 00 Page 8 certificate of calibration from an independent laboratory. Prior to each use, the water meter shall be checked for accuracy and, if necessary, recalibrated.

c. Holding tank(s) or sump(s) of the mechanically agitated type to provide a high volume and continuous injection of grout. The sump shall be capable of holding the solids of the mix in suspension and have a capacity of at least 12 cubic feet of grout or three times the capacity of the mixing system. Volume of grout used from the agitator holding tank(s) or sump(s) shall be measured by a vertical graduated stick or marks at different levels in the tank(s)/sump(s).

d. Valves, pressure gauges, grout lines, header arrangements, and accessories as necessary to provide a continuous supply of grout and accurate pressure control. Grout shall be conveyed between the pump and the hole using a single-line system consisting of a pipe, hose, or combination of both extending from the pump discharge to the header at the hole collar with grout injection rate controlled by the pump speed, or circulating double-line system composed of a supply line to the header at the hole collar and a return line from the header to the grout pump, sump, or holding tank. Grout lines shall consist of either black steel pipe, reinforced rubber or plastic hose, or a combination of both. The maximum inside diameter of all grout lines shall be 1 inch.

The grout injection rate for the single-line system shall be controlled by the pump speed so that settlement of solids within the lines will not occur when pumping at or above the minimum discharge capacity of the pump. The pressure in the double-line system shall be controlled by one or more valves on the control line. The distance between the hole and the pump or holding tanks shall be as short as possible to minimize the accumulation of solids and possible clogging. Pressure gauges shall be high precision, graduated with divisions not greater than 2 psi on the dial face, calibrated and certified correct prior to use. Gauges shall be tested for accuracy as directed by the Contracting Officer during the work by cross comparison with a standard set of oil-filled gauges. The moving parts of all gauges shall be protected from dust, grit, and direct contact with grout.

e. Flow cone(s) to ascertain the fluidity of grout mixtures. The flow cone and method of test shall be in accordance with ASTM C 939.

f. Telephone or radio communications between the grout plant and the hole being grouted when the site conditions, such as distance, noise level, or visual obstructions, negatively impact on the proper control of grouting operations.

g. Flow meters to measure flows of both water and grout. The meters shall be either magmeter or ultrasonic types of flow meters and shall be fitted with replaceable liners to avoid damage from grout build-up.

The meters shall be capable of measuring flows of up to 60 gpm to an accuracy of 1 gpm and shall be calibrated after every 40 hours of use.

3.1.3 Field Mix Design Testing

The Contractor shall conduct field mix design testing for all proposed grout mixes. These tests shall be conducted onsite, under conditions similar to actual grouting conditions. For each grout mix, the following characteristics shall be determined:

a. Specific Gravity

SECTION 31 73 00 Page 9

b. Viscosity

c. Percent Bleeding

d. Pressure Filtration Coefficient

e. Initial Set Time

f. Final Set Time

g. Compressive Strength (at 3-, 7-, 14-, and 28-day intervals)

3.1.4 Other Mix Designs

Other mix designs may be developed after the start of the grouting program if field mix design test results or other site conditions indicate it to be necessary. All such grout mixes shall be tested to determine the characteristics listed above.

3.2 GROUT, DRAINAGE, AND VENT HOLES

Holes through concrete or into the surrounding rock, for the purpose of injecting grout or air release and providing drainage, shall be as directed by the Contracting Officer. Holes shall be formed by embedding pipe in the concrete at the time of placing or they shall be made by drilling through the concrete. All grout and vent holes shall be drilled using only water or compressed air.

3.2.1 Embedded Pipe

All metal pipe and fittings required for constructing grout holes and grout hole connections shall be provided by the Contractor. All pipe and fittings embedded in concrete shall be cleaned thoroughly of dirt, grease, grout, and mortar immediately before embedding and shall be firmly held in position and protected from damage or displacement while the concrete is being placed. Great care shall be taken to avoid premature clogging of pipes and any pipe that becomes clogged or obstructed before completion of operations shall be cleaned out in a satisfactory manner or replaced at the expense of the Contractor. All piping required for the work shall be cut, threaded, fabricated, and installed by the Contractor, as required.

3.2.2 Grout Hole Drilling

Grout holes shall be located as directed by the Contracting Officer. Grout holes drilled through concrete shall be of sufficient size to permit the caulking or grouting of short lengths of minimum 2 1/2 inch diameter pipe into the hole for attachment of the grout supply line. The size of completed grout holes shall be checked frequently during the work to assure proper hole diameters are achieved. Each hole drilled shall be protected from becoming clogged or obstructed by means of a cap or other suitable device on the collar. The use of greases, "rod dope", or other lubricants on the drill rods or in grout holes will not be permitted. No core recovery will be required, and the drilling fluid shall be water or compressed air. During the drilling of grout holes, the Contractor shall take all precautionary measures to control dust, fumes, and noise in conformity with the applicable local, State, and Federal laws, codes, and regulations.

3.2.3 Vent Hole Drilling

Vent hole drilling shall be performed as directed when required to determine the condition of the apron subgrades prior to grouting or the effectiveness of the grouting operations.

SECTION 31 73 00 Page 10

3.3 GROUTING PROCEDURES

Grouting shall be done in the presence and under the direction of the Contracting Officer. Cement grout which is not injected into the hole within 1 hour after mixing (30 minutes if the mix contains fluidifier with expanding agent) shall be removed from the mixer, sump, and supply line and shall be wasted. All pressure grouting operations shall be performed in accordance with the following general procedures.

3.3.1 Grouting Pressures

Grouting pressures to be used in the work will vary with conditions encountered in the respective holes and pressures used shall be as directed. It is anticipated that pressures will range from 2 psi to 8 psi, but in no event will pressures in excess of 10 psi be required or allowed.

3.3.2 Grout Mixes

The grout mixes used shall be as directed by the Contracting Officer and shall be selected from the various mix designs submitted and tested by the Contractor. Mixes will be selected based upon the characteristics of each hole as revealed by the drilling, pressure testing, and grouting operations.

3.3.3 Backfilling of Dam Apron Holes

Holes shall be backfilled with grout proportioned as directed by the Contracting Officer and generally having a water/cement ratio less than

1.0. The backfilling shall be accomplished by injection of grout through a tremie pipe or hose inserted to full depth of hole and finished flush with the surface of the dam apron. When grout vents at the surface, the tremie shall be gradually withdrawn, maintaining grout in pipe or hose until completely removed. Holes containing freshly injected grout shall not be backfilled until the injected grout has set. No separate payment will be made for backfilling holes; however, grout will be paid for at the contract unit price for the grout placement therein.

3.3.4 Equipment Arrangement and Operation

The arrangement of the grouting equipment shall be such as to provide a continuous circulation of grout throughout the system and to permit accurate pressure control by operation of a valve on the grout return line, regardless of how small the grout take may be. The equipment and lines shall be prevented from becoming fouled by the constant circulation of grout and by the periodic flushing out of the system with water. Flushing shall be done with the grout intake valve closed, the water supply valve open, and the pump running at full speed.

3.3.5 Waste Water and Grout

Grout that cannot be placed or injected prior to initial set or maximum specified time limit shall be wasted. If such grout is mixed at the direction or approval of the Government Representative, it shall be paid for at the applicable contract unit prices for the material constituents of the wasted grout. During the progress of the work, the Contractor shall provide for adequate disposal of all wash and waste water and remove all waste grout, on a daily basis if necessary, to maintain a safe and effective grouting operation.

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3.4 COMMUNICATIONS

When, for his own convenience, the Contractor has the individual elements of his plant so located that communication by normal voice between these elements is not satisfactory, the Contracting Officer may require him to install a satisfactory mechanical means of communications, such as a two-way radio, cellular telephone, or other suitable device.

3.5 RECORDS

The Contractor shall prepare, on a daily basis, records of all grout hole and vent hole drilling operations, all pressure washing and pressure testing operations, and all cement grouting operations. These records shall include: driller's logs of all grout holes, drain holes, and vent holes; pressure washing information and pressure testing results; grouting data, including time of each change of operation, rate of pumping, grouting pressures, changes in water-cement ratio, changes in proportions of additives, such as fluidifier, accelerator, or sand, and amounts of various materials injected; core logging data on Government provided ENG FORM 1836 at a vertical scale of 1 inch equals 1 foot; and other data considered necessary as determined by the Contracting Officer.

3.6 CONTRACTOR QUALITY CONTROL

In accordance with Section 01 45 01 USACE QUALITY CONTROL, quality control shall be established and maintained which shall specifically include, but not be limited by, inspections to assure that:

a. The specified qualification requirements are met.

b. Drilling and grouting equipment is provided as specified and maintained in satisfactory condition.

c. The required amount of cement or chemical grout materials are kept on hand during grouting operations.

d. Grouting is performed in the presence of a Government Representative.

e. Required records are kept and submitted as specified.

f. Accurate cement or chemical grout mixture proportions are maintained as directed or as recommended by the manufacturer or supplier.

g. Materials are properly protected from moisture and contamination after delivery and transportation to the site.

h. Only approved materials are used.

i. The quantity of bulk materials used equals the computed amount.

3.7 ENVIRONMENTAL RESTRICTIONS

The Contractor shall use procedures to minimize or avoid environmental impacts due to grouting activities and to comply with applicable environmental regulations and requirements of Section 01 57 20.00 10 ENVIRONMENTAL PROTECTION. The Contractor shall have full responsibility for violating any of the environmental regulations and requirements of Section 01 57 20.00 10 ENVIRONMENTAL PROTECTION, and associated fines.

SECTION 31 73 00 Page 12

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SECTION 31 73 00 Page 13

2.2 PIPE AND FITTINGS