Block 9 stage 2 – schedules 1 and 4




НазваниеBlock 9 stage 2 – schedules 1 and 4
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SECTION 3.5   SURFACING


3.5.1 GRAVEL SURFACING


a. General.   The Contractor shall furnish and place gravel surfacing on the pumping plant and tank yards and portions of the O&M road as shown on the drawings. The surfacing material shall be placed to the width and thickness shown on the drawings.


b. Material.   The gravel surfacing material shall consist of sand and gravel from which all rocks having a maximum dimension of more than 1 inch shall be removed. The material from gravel sources shall be selected to include a sufficient quantity of natural cementitious or binding material such that the surfacing will bond readily under the action of traffic.


(1) Grading.   The gravel surfacing material shall conform to the following limits of gradation:


Screen Size

Percent Passing

1 inch

100

3/4 inch

90 to 100

No. 4 sieve

45 to 75

No. 200 sieve

8 to 15


The plasticity index of material passing the No. 40 sieve shall be between four and nine.


(2) Quality.   When subjected to the Los Angeles abrasion test, the aggregate shall have a loss using grading A not to exceed 50 percent, by weight, at 500 revolutions.


c. Placing.   Surfaces to receive the gravel shall be bladed or dragged to secure a uniform subgrade. The surfacing material shall be spread uniformly on the prepared subgrade to the required depth and dimensions, and moistened, if required. The material shall be rolled and compacted in accordance with paragraph 3.1.1 to a thickness of 4 inches.


d. Measurement and payment.   Measurement for payment for furnishing and placing 4 inch thick gravel surfacing will be based on the surface area of the subgrade required to be covered with gravel surfacing.


Payment for furnishing and placing 4 inch thick gravel surfacing will be made at the unit price per square yard bid therefore in the schedule, which unit price shall include the cost of furnishing or procuring the gravel and binder, preparing the subgrade, and of hauling, moistening, spreading, and compacting the material.


3.5.2 SOIL APPLIED HERBICIDE


a. General.   The Contractor shall furnish and apply soil applied herbicide in accordance with this paragraph. Soil applied herbicide shall be applied to all gravel surfacing placed under these specifications.


Soil applied herbicide shall be applied only with the approval of the COR, and the use plan, storage, mixing, application, and records of soil applied herbicide shall be in accordance with the requirements of paragraph 1.5.9. The Contractor shall contact NAPI two weeks before any herbicide application.


b. Submittals.   Submittals shall be in accordance with this paragraph and paragraph 1.1.5. The Contractor shall submit:


(1) A use plan for soil applied herbicide. The use plan for soil applied herbicide shall be included in the pesticide use plan submitted in accordance with paragraph 1.5.9.


(2) The applier certification required in subparagraph e. below.


c. Materials.   Soil applied herbicide shall bear the EPA (Environmental Protection Agency) pesticide registration number on the label.


The soil applied herbicide shall conform, at the Contractor's option, to one of the following (commercial mixtures meeting the requirements may be used):


(1) Atrazine.   Composed of a finely divided, wettable powder containing a minimum of 80 percent 2 chloro 4 ethylamino 6 isopropylamino s triazine and related compounds. If this option is applied between May through December, approval shall be obtained from NAPI.


(2) Bromacil.   Composed of a finely divided, wettable powder containing a minimum of 80 percent 5 bromo 3 sec butyl 6 methyluracil.


d. Mixing.   The soil applied herbicide shall be mixed as follows: Atrazine and bromacil shall be mixed with water and applied uniformly so that the equivalent of 0.035 pounds of dry product is used per 100 square feet (about 15 pounds per acre). A minimum of 2 gallons of water shall be applied with each pound of dry product. Material shall be kept in suspension at all times during application by continuous agitation.


e. Application.   Soil applied herbicide shall not be applied until after the gravel surfacing has been placed. Application shall be in accordance with label directions and applicable EPA, State, and local laws and regulations, and shall be coordinated with NAPI. Appliers shall be certified by appropriate State or local agencies, as required.


f. Measurement and payment.   Measurement for payment for furnishing and applying soil applied herbicide will be made of the areas treated. Payment for furnishing and applying soil applied herbicide will be made at the unit price per square yard bid therefore in the schedule.

DIVISION 4   PIPELINES


SECTION 4.1   PIPELINES, GENERAL


4.1.1 PIPE, GENERAL


The Contractor shall furnish and lay line pipe for the lateral pipelines and structures as shown on the drawings and as specified in these specifications. The types of pipe permitted under these specifications are specified in paragraph 4.1.2.


Pipe is designated on the plan and profile drawings by an alphanumeric symbol. For PVC pipe, the symbol identifies the pipe diameter and dimension ratio as follows: the first number in the symbol indicates the nominal diameter in inches; the alphanumeric indicates the dimension ratio as defined in AWWA C900 and C905; and the number in parenthesis is the hydrostatic head measured to the centerline of the pipe. A symbol of 24DR25 (325) means the pipe is 24 inches in diameter with a dimension ratio (DR) of 25 and 325 feet of hydrostatic head. The pipe designations shown on the drawings and in these specifications establish the minimum requirements for all the pipe types allowed under these specifications.


The Contractor shall submit for informational purposes pipelaying diagrams showing position and marking of various pipe sections to the Construction Engineer in accordance with paragraph 1.1.5.


Pipelaying diagrams shall include centerline and invert stationing and elevations at all horizontal and vertical breaks in alignment and shall also include the subgrade elevation for each pipe fitting.


Three copies of each revised diagram shall be submitted to the Construction Engineer as soon as revisions are made.


During manufacturing, transporting, storing, and laying pipe and pipefittings, the pipe and pipefittings shall not be dropped or subjected to any unnecessary jar, impact, or other treatment that could crack the shell, coating, lining or otherwise damage the pipe. Pipe shall not be loaded and hauled to the worksite until after the specified curing period.


Pipe shall not be stored in the yard or on the jobsite under any conditions that would cause injurious drying out of the concrete, mortar coating or lining, or ultraviolet degradation of PVC pipe. Whenever necessary, in order to prevent cracking of the concrete, coating and lining, or other objectionable effects of drying, pipe shall be adequately protected by means of shelter or application of water. Any length of pipe that in the opinion of the Contracting Officer’s Representative (COR) is damaged beyond repair by the Contractor in hauling, handling, unloading, storing, exposure to cold weather, or otherwise shall be removed from the worksite and replaced by and at the expense of the Contractor with another length of pipe of equal or greater design strength.


The Contractor shall not lay any pipe by using a method of stabbing or swinging one joint into the collar or bell of another joint. Bumping or pushing of pipe units with pneumatic tire equipment will not be permitted. Pipe with spigot and bell type joints shall be laid spigot to bell.


R type joints are defined as flexible joints having a rubber gasket.


Except for PVC pipe, the Contractor shall not reuse rubber gaskets when pipe joints are pulled and refitted. Rubber gaskets for PVC pipe may be reused if the gaskets are not visibly damaged.


At all times, the Contractor shall take necessary precautions, such as adequate sumps and pumps, to avoid floating or otherwise displacing the pipe. If a portion of the pipeline is floated or otherwise displaced, those pipe sections that floated or were displaced shall be removed, any damage to the soil cement slurry or bedding material around the pipe sections shall be repaired, and the pipe sections shall be relaid, all at the expense of the Contractor. If any pipe sections are damaged due to the flotation or displacement, the damaged pipe sections either shall be repaired to the satisfaction of the COR or shall be removed from the worksite and replaced with a new pipe section. Such repair or replacement shall be at the expense of the Contractor.


4.1.2 PIPE TYPES


The Contractor shall furnish and lay reinforced concrete pressure pipe and PVC pressure pipe in accordance with the requirements of Table 4A.


Table 4A.   Pipe Types

Location

Options Allowed

B0.1R Turnout Pipe Ext.

Reinforced Concrete only

All other line pipe

PVC only


Classes of PVC pressure pipe and reinforced concrete pressure pipe that correspond with the pipe classification symbols shown on the plan and profile drawings are provided in Sections 4.2 and 4.3.


The PVC pipe dimension ratios (DR) shown on the plan and profile drawings are based on AWWA Cast Iron (CI) sizes for diameters 8 inches through 36 inches. Any substitution of pipe must meet or exceed the inside diameter and pipe wall thickness for the DR shown on the plan and profile drawings.

4.1.3 MEASUREMENT AND PAYMENT FOR LINE PIPE AND PIPELINE ACCESSORIES


a. Line pipe.   Measurement for payment for furnishing and laying line pipe will be made along the centerline of the pipe between the ends of the pipe in place and will be continuous through road crossings, bends, tees, crosses, adaptors, tapers, couplings, B0.1G flowmeter, closure sections, and other fittings with no allowance for lap at joints. Measurement for payment for line pipe from pipe outlets will begin at the downstream face of the valve or flange. The stations shown on the Plan and Profile drawings shall be the break point between the various bid items for furnishing and laying line pipe.


Payment for furnishing and laying the various sizes and classes of line pipe designated by symbols will be made at the applicable unit price per linear foot bid in the schedules for furnishing and laying symbol pipe, which unit price shall include the cost of furnishing all materials, manufacturing and laying the pipe, furnishing and placing concrete in collars, encasements and blocking, and furnishing and installing warning tape. Where tapers and adaptors are used along the line, payment for the pipe in the tapers and adaptors will be made for pipe having a diameter equal to that of the largest diameter of the taper or adaptor for the minimum L length shown on the drawings. If, after award of contract, the Contractor has to provide the next larger size of pipe to meet the inside diameter requirement of the specifications, and a pipe fitting is encountered, such as a sectionalizing valve, then the fitting and associated valve must be the same as the larger pipe size. Payment for the larger size pipe, valves, and fittings will be made at the unit price bid in the schedule for the specifications denoted size and not for the larger size.


b. Repair kit.   The Contractor shall furnish a repair kit which shall consist of one standard length of pipe and two couplings that fit each of the following symbol pipe as follows:


Schedule 1: 24DR25 and 36DR25.


Schedule 2: 10DR25, 12DR25, 18DR25, 20DR25, and 24DR25.


Schedule 3: 8DR25, 12DR25, 14DR25, 16DR25, 18DR25, 24DR25, 30DR25, and 36DR25.


Schedule 4: None required.


Schedule 5: 10DR25, 18DR25, 24DR25, and 30DR25.


Schedule 6: 8DR25, 10DR25, 14DR25, 16DR25, 18DR25, 24DR25, 30DR25, and 36DR25.


The pipe shall be stored and protected as directed by the Construction Engineer.


Payment for furnishing pipe repair kit will be made at the applicable lump sum price bid therefore in the schedules.


c. Pipe outlets.   Pipe outlets from line pipe for tees, including tees for deliveries and bullheaded tees, air valves, crosses, and manholes will be paid for separately and will be in addition to the above payment for line pipe.


A pipe outlet from line pipe for an air valve assembly is defined for payment as an opening in the line pipe shell for the pipe outlet with required nozzle, bushing or coupling, corrosion rings, steel wrapper plate or single steel cylinder, and all accessories required for the pipe outlet connection.


A pipe outlet from line pipe for a tee for a delivery is defined for payment as an opening in the line pipe shell for the pipe outlet with the required steel wrapper plate, steel collar, or single steel cylinder; nozzle or steel threaded coupling; gaskets; welding flange; coating; lining; and all accessories required for the pipe outlet connection.


A pipe outlet from line pipe for bypass piping around butterfly valves is defined for payment as an opening in the line pipe shell for the pipe outlet with the required steel wrapper plate or steel collar, nozzle, welding flange, lining, and all accessories required for the pipe outlet connections.


A pipe outlet from line pipe for a manhole is defined for payment as an opening in the line pipe shell for the pipe outlet with the required sleeve and reinforcement collars, nozzle, steel plate saddle, rods, welding flange, manhole cover, gasket, bolts, lining, coating, and all accessories required for the pipe outlet connection.


A pipe outlet from line pipe for a cross is defined for payment as two openings in the lateral pipe shell for the pipe outlet with the required sleeve and reinforcement collars, steel wrapper plate or single cylinder, nozzle, steel plate saddle, rods, gasket, welding flange, coating, lining, and all accessories required for the pipe outlet connection.


Payment for providing pipe outlets from line pipe will be made at the applicable unit price per outlet bid therefore in the schedules, regardless of the type of pipe and fittings furnished, which prices shall include all costs of providing outlets as defined above. Payment for providing pipe outlets from line pipe will be made in accordance with the group listing in Table 4B. The D1 and D2 dimensions correspond to the dimensions on the applicable drawings. The cost of providing the 2 inch pipe outlets required for the flowmeter probes shall be included in the lump sum price bid in the schedule for furnishing and installing the 2 inch steel piping and 2 inch ball valve for the flowmeter probes.


Payment for valves and bypass piping shall be in accordance with paragraph 9.3.1.

Table 4B.   Line and Delivery Pipe Outlets




Diameter Dimensions, inches

Group

Line and Delivery Pipe Size (D1)

Outlet Size (D2)

I

8 through 36

2

II

8 through 36

4   10

III

8 through 36

4

IV

30 and 36

24

V

14 and 36

4 to 36


Group I is pipe outlets for 2 inch air valve assemblies from line pipe.

Group II is pipe outlets for tees for deliveries from line pipe.

Group III is pipe outlets for bypass piping around butterfly valves used as sectionalizing valves.

Group IV is pipe outlets for manholes from line pipe.

Group V is pipe outlets for crosses from line pipe.


4.1.4 FLUSHING AND FILLING LATERAL SYSTEM


The Contractor shall flush and fill with water to full static head any pipeline or portion of any pipeline constructed under these specifications that can be sectionalized by valves or gates, as soon as they are completed and can be filled with water from Burnham Lateral Reach 1 Canal during irrigation season. During non-irrigation period and prior to filling any pipeline, the Contractor shall completely clean the canal turnouts of trash, weeds, sediment, and any other foreign material.


In accordance with paragraph 1.3.14, the Contractor will not be required to furnish or haul water to fill a pipeline or portion of a pipeline. The Contractor shall notify the Construction Engineer, in writing, at least 30 days before filling a pipeline or portion of a pipeline. Flushing shall be accomplished by the following method:


Before moving to next location, flushing shall continue until water appears clear and free of dirt, sediment, and other debris. When flushing laterals and sublaterals through deliveries, the line meter in the delivery shall be removed prior to beginning flushing. The Contractor shall provide an adaptor with hose to flush water from the deliveries. All line meters removed shall be reinstalled after flushing is completed. The upstream butterfly valves on deliveries used for flushing shall be closed before proceeding with flushing of the next lateral or sublateral.


Lateral B0.1L and sublaterals: All delivery upstream butterfly valves and all sectionalizing valves, except the sectionalizing valve at Lateral B0.1L station 3+20, shall be closed. Flushing shall begin with the main stem of Lateral B0.1L flushing through Delivery B0.1L-2.60A. Sublaterals B0.1L-0.9L and B0.1L-1.7R shall then be flushed through Deliveries B0.1L-0.9L-0.55A and B0.1L-1.7R-0.38A, respectfully.


Lateral B0.1R and sublaterals: All delivery upstream butterfly valves and all sectionalizing valves, except the sectionalizing valve at Lateral B0.1R station 3+20, shall be closed. Flushing shall begin with the main stem of Lateral B0.1R flushing through Delivery B0.1R-2.09L. Sublateral B0.1R-1.6R shall then be flushed through Delivery B0.1R-1.6R-0.49A.


Lateral B0.1G and sublaterals: All delivery upstream butterfly valves and sectionalizing valves on Sublateral B0.1G-0.9 R shall be closed. The sectionalizing valve located at Lateral B0.1G station 49+48.73, shall be open. Flushing shall begin with the main stem of Lateral B0.1G flushing through Delivery B0.1G-2.99R. The Contractor may remove the blind flange located at Lateral B0.1G station 158+00 for flushing.


Sublateral B0.1G-0.9R shall then be flushed. All delivery upstream butterfly valves and the sectionalizing valve on Sublateral B0.1G-0.9R-0.5R shall be closed. The sectionalizing valve at Sublateral B0.1G-0.9R station 29+03.76 shall be open. Sublateral B0.1G-0.9R shall then be flushed through Delivery B0.1G-0.9R-2.21A.


Sublateral B0.1G-0.9R-0.5R shall then be flushed. All delivery upstream butterfly valves and the sectionalizing valve on Sublateral B0.1G-0.9R-0.5R-1.4R shall be closed. Sublateral B0.1G-0.9R-0.5R shall then be flushed through Delivery B0.1G-0.9R-0.5R-2.05A.


Sublateral B0.1G-0.9R-0.5R-1.4R shall then be flushed through Delivery B0.1G-0.9R-0.5R-1.4R-0.61A.


Lateral B0.9L: All delivery upstream butterfly valves and the sectionalizing valve on Sublateral B0.9L-0.4L shall be closed. The sectionalizing valve at Lateral B0.9L station 23+69.61 shall be open. Flushing shall begin with the main stem of Lateral B0.9L flushing through Delivery B0.9L-2.08A. Sublateral B0.9L-0.4L shall then be flushed through the Delivery B0.9L-0.4L-0.59A.


The COR may direct the Contractor to perform additional flushing through deliveries not listed if the COR determines it is necessary.


After the laterals and sublaterals are flushed and filled, the Contractor shall flush the remaining deliveries, beginning at the plants and working downstream. Removal of the line meter at deliveries not used for flushing laterals and sublaterals will not be required.


The pipelines or portion of a pipelines filling rate shall not exceed 2 cubic feet per second. The full static head (water at elevation E or higher in elevated tank) shall be maintained in the pipeline for 96 hours or until it is accepted by the Government. All leaks shall be repaired in an approved manner as determined by the COR before acceptance by the Government. The Contractor shall provide all labor, equipment and materials, except water, required for flushing and filling the pipelines.


The cost of flushing and filling the pipelines and maintaining them at static head shall be included in the prices bid in the schedule for furnishing and laying symbol pipe.


The Contractor shall notify NAPI, in writing, at PO Drawer 1318, Farmington NM 87449, seven calendar days prior to filling the lateral system. A copy of this letter shall also be mailed to the COR.


4.1.5 PIPE CROSSINGS AT EXISTING UTILITY PIPELINES


a. General.   The Contractor shall encase pipe and fittings furnished and laid under these specifications with polyethylene film at utility pipeline crossings and shall install petroleum resistant gaskets in accordance with the requirements of Table 4C and this paragraph. All polyethylene surfaces shall be wrapped with roofing felt.


b. References.   The publications with the approval or revision date listed below form a part of this specification to the extent referenced.


ASTM INTERNATIONAL (ASTM)

ASTM Standard

Title

D 1248  05

Polyethylene Plastics Molding and Extrusion Materials for Wire and Cable




U.S. BUREAU OF RECLAMATION (USBR)

USBR Standard Specifications

Title

M 15   October 25, 1991

Rubber Gaskets for Joining Pipe


c. Submittals.   Submittals for petroleum resistant gaskets shall be in accordance with Reclamation's Standard Specifications No. M 15 "Standard Specifications for Rubber Gaskets for Joining Pipe."


d. Materials.   Polyethylene film shall be manufactured of virgin polyethylene material conforming to the requirements of ASTM D 1248, IAE1 (natural color) or IC E1 (black).


Polyethylene film shall have a minimum nominal thickness of 0.008 inches (8 mils). The minus tolerance on thickness shall not exceed 10 percent of the nominal thickness.


The polyethylene shall be in tube or sheet form. The minimum polyethylene width for the flat tube shall be 1.65 times the outside diameter of the pipe bell, and the minimum polyethylene width for the sheet shall be 3.30 times the outside diameter of the pipe bell.


Petroleum resistant gaskets shall be in accordance with Reclamation's Standard Specifications No. M 15 "Standard Specifications for Rubber Gaskets for Joining Pipe."


Roofing felt shall be 15 pound roofing felt.


Table 4C.   Polyethylene Encasement and Petroleum resistant Gasket Requirements

for Pipe Crossings at Existing Utility Pipelines

Type of line pipe furnished

and laid by Contractor

Existing utility pipeline

Protection required

The following types of pipe with rubber gasket joints:


PVC



Metallic or nonmetallic gasoline, natural gasline, oil, or sanitary sewer


Metallic or nonmetallic water or storm sewer


1. Encase joints that are within 100 feet on each side of the crossing with polyethylene. The polyethylene shall extend for 5 feet on each side of the joint.** ***


2. Install petroleum resistant gaskets in all joints within 100 feet on each side of utility.*

None


* At natural gaslines, petroleum resistant gaskets are not required.

** At sanitary sewer crossings, encase pipe joints that are within 10 feet on each side of the crossing.

*** Not applicable if line pipe is required to be encased with polyethylene for cathodic protection and monitoring system or corrosion monitoring system.


e. Preparation and installation.   The polyethylene encasement shall prevent contact between the pipe and the surrounding backfill and bedding material but is not intended to be a completely airtight and watertight enclosure. Overlaps shall be secured by the use of adhesive tape, plastic string, or any other material capable of holding the polyethylene encasement in place until backfilling operations are completed.


Prior to encasing with polyethylene, foreign substances on the pipe and fitting surfaces, such as mud, dirt, clods, and any loose aggregate, shall be removed.

Junctions of tube or sheet polyethylene shall overlap at least 1 foot longitudinally.


Fittings for pipe shall be encased with polyethylene in the same manner as the pipe.


Rips, punctures, or other damage to the polyethylene shall be repaired with adhesive tape or with a suitable polyethylene film patch. All repairs shall be made prior to wrapping with roofing felt.


Roofing felt shall be wrapped around the entire polyethylene encasement and taped in place. Special care shall be exercised during backfilling operations as necessary to prevent puncturing the polyethylene encasement and roofing felt.


f. Cost.   No direct payment will be made to the Contractor for furnishing materials, labor, and equipment required to encase the pipe, or for furnishing and installing petroleum resistant gaskets, and the costs thereof shall be included in the prices bid in the schedule for furnishing and laying pipe for which the polyethylene encasement and petroleum resistant gaskets are required.


4.1.6 PIPE IN DELIVERY INSTALLATIONS AND BYPASSES


a. General.   Pipe in delivery installations and bypasses shall be constructed as shown on the drawings and in accordance with this paragraph.


b. References.   The publication with the approval or revision date listed below forms a part of this specification to the extent referenced.


ASTM INTERNATIONAL (ASTM)

ASTM Standard

Title

D1785 06

Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120


c. Materials.  


(1) Metal pipe and fittings.   Shall conform to paragraph 9.3.1.


(2) PVC plastic pipe, including PVC valve boxes.   ASTM D 1785, schedule 80.


(3) Line meters.   Shall conform to paragraph 9.4.3.


(4) Concrete.   Shall conform to Division 5.


d. Approval of fittings for pipe in delivery installations and bypasses.   Details for fittings shall be submitted by the Contractor for approval to the Construction Engineer in accordance with paragraph 1.1.5. Any material shipped before approval of data will be at the Contractor's risk. The time allowed for mailing and approval of data submitted to the Government for approval shall be as provided in paragraph 1.1.5. Approval of data by the Government shall not be held to relieve the Contractor of any part of the Contractor's obligation to meet all requirements of these specifications or the responsibility for the correctness of the data submitted.


e. Measurement and payment.   Measurement for payment for furnishing and laying pipe in delivery installations will be made along the centerline of the pipe between the ends of pipe in place and will be continuous through tees, bends, fittings, and adaptors with no allowance for lap at joints, except that line meters and valves will not be included in the measurement for payment.


Measurement for payment for the various types of delivery pipe and PVC pipe for drains will be as follows:


(1) Measurement for payment for delivery pipe from line pipe for delivery installations will begin at the downstream face of the tee flange or taper/adaptor, whichever is applicable.


(2) Measurement for payment for PVC pipe for drains in deliveries and vaults will begin at the downstream face of the elbow connection.


Payment for furnishing and laying the various diameters of steel pipe in delivery installations and payment for furnishing and laying 2-inch diameter PVC pipe for drains in deliveries and vaults will be made at the applicable unit prices per linear foot bid therefore in the schedules, which unit prices shall include the cost of furnishing and laying the pipe, fabricating elbows for vertical riser pipe, furnishing and installing hub and flange adaptors and tapers, furnishing and installing meter base metalwork, including steel flanges. Concrete in collars, blocking at tees, and encasements at tees and bends will be paid for as specified in paragraph 5.1.3. Payment for the pipe in the adaptors and tapers will be made for pipe having a diameter equal to that of the largest diameter of the adaptor or taper for the minimum L length shown on the drawings.


The cost of furnishing and laying steel pipe for bypasses shall be included in the lump sum price bid in the schedule for furnishing and installing metal piping for bypasses.


4.1.7 CONSTRUCTING ROADWAY CROSSINGS BY THREADING THROUGH EXISTING CMP


a. General. - The Contractor shall construct the roadway crossings by threading the carrier pipe through existing corrugated metal casing pipe as shown on drawing 41 (809-D-6074) and placing soil-cement slurry in the annular space between the new pipe and existing pipe. Prior to constructing the crossings, the Contractor shall verify the location and elevation of the existing casing pipe.


The Contractor shall furnish all labor, equipment, and materials; shall construct falsework, cribbing, and temporary construction; and shall perform all pumping and unwatering required for constructing the roadway crossing.


b. Submittals. - The Contractor shall submit plans for threading the carrier pipe through the existing casing pipe and details of the method for placing the soil-cement slurry, for approval, in accordance with paragraph 1.1.5.


c. Materials. -


(1) Carrier pipe. - Carrier pipe shall conform to Section 4.2.


(2) Soil-cement slurry. - The soil cement slurry shall meet the requirements of paragraph 3.3.5.


d. Threading of carrier pipe. - Threading carrier pipe through casing pipe shall conform to paragraph 4.2.3, and the method of threading the pipe shall be approved by the COR. The carrier pipe shall be threaded through the existing casing pipe to the proper grade. During the threading operation, intermediate supports shall be placed by the Contractor about the carrier pipe to maintain proper grade and prevent flotation of the carrier pipe during soil-cement slurry installation.


e. Placement of soil-cement slurry.   The annular space between the carrier pipe and the existing casing pipe shall be backfilled with soil-cement slurry. The soil cement slurry shall not be mixed or placed when the air temperature is below 40 F. Temperature of the soil cement slurry shall be between 50 and 85 F at time of placement. If the COR determines that weather conditions are unsuitable, soil-cement slurry shall not be placed.


Bulkheads, as shown on drawing 41 (809-D-6074), shall be in place at the downstream and upstream ends of the pipe to contain the slurry in the annular space.


Wastewater or wasted slurry from backfilling operations shall not enter flowing or dry watercourses without the approved use of turbidity control methods in accordance with paragraph 1.5.3.


f. Payment. - Payment for constructing roadway crossings by threading through existing CMP at the various locations will be made at the applicable lump sum price bid therefore in the schedules, which price shall include the costs of all labor, equipment and materials, except carrier pipe, required for constructing the roadway crossings in accordance with approved drawings and the requirements of this paragraph.


Payment for furnishing and laying carrier pipe will be made at the applicable unit prices bid in the schedules for furnishing and laying symbol pipe.


4.1.8 CONSTRUCTING ROADWAY CROSSINGS BY OPEN CUT EXCAVATION


a. General.   The Contractor shall construct the roadway crossings at the locations shown on drawings 14 (809 D 6047) and 16 (809-D-6049) by open-cut excavation. The Contractor may construct the crossings by boring provided that details are submitted to the Construction Engineer for approval. All workmanship and materials used in construction of the roadway crossing shall conform to the Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects (FP 96) and New Mexico Department of Transportation (NMDOT) Specifications.


Prior to constructing the crossings, the Contractor shall notify NMDOT.

b. Construction.   The Contractor shall construct barriers where required by the NMDOT.


The barriers and signs shall conform to the latest edition of the "Manual on Uniform Traffic Control Devices for Streets and Highways" ANSI D6.1 and NMDOT requirements. Roads shall not be closed for more than 30 Calendar days for constructing roadway crossings.


The Contractor shall saw cut the existing asphalt surfacing perpendicular to the road centerline at the limits of the surfacing to be removed.


The pipe trench shall be excavated in accordance with paragraph 3.2.3, backfilled in accordance with paragraph 3.3.3, and the backfill compacted in accordance with paragraph 3.3.4 to the densities stated in paragraph 3.1.1 . The pipe trench shall be compacted for the entire width of the NMDOT right of way (Minimum of Fence to Fence). The pipe and soil cement shall be placed in accordance with applicable paragraphs of these specifications.


An asphalt concrete pavement shall be placed across the entire width of the roadway removed. The pavement shall extend from sawcut to sawcut. The asphalt concrete pavement shall be the same thickness as the existing pavement and shall conform to NMDOT mix design.


The finished road surface shall be smooth with no dips or bumps caused by construction of the road crossing and shall the roadway strips shall be repainted to meet the NMDOT requirements and specifications.


c. Payment.   Payment for constructing roadway crossings by open cut excavation at the various locations will be made at the applicable lump sum price bid therefore in the schedules, which price shall include the cost of saw cutting, material removal, and rebuilding of the road included stripping, detours and any other NMDOT requirements.


Payment for furnishing and laying line pipe will be made in accordance with paragraph 4.1.3. Payment for excavation, backfill, and compacting backfill in pipe trenches will be made in accordance with the applicable paragraphs of Sections 3.2 and 3.3.


4.1.9 WARNING TAPE


a. General.   The Contractor shall furnish and install a warning tape at least 18 inches below the ground surface and at least 18 inches above all pipe before backfill is completed. The tape shall be 6 inches wide. The tape shall be blue and shall read "CAUTION WATER LINE BURIED BELOW FOR INFORMATION CALL NAPI O&M DIRECTOR" with this warning label repeated at least once every three feet.


b. Cost.   The cost of furnishing and installing warning tape shall be included in the unit prices bid in the schedule for furnishing and laying symbol pipe.

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