Township of Northville, MI Water Mains and Appurtenances Design and Construction Standards

The general location of the water mains shall conform to the Township's water supply distribution system Master Utility Plan. Minor location changes may be considered acceptable, provided that the Director has determined that the intent of the master plan has been met.

Generally, water mains shall be installed within a public right-of-way line or in easements reserved for such use. All easements shall be a minimum of 20 feet wide. All easements and water mains shall be dedicated to the authority having jurisdiction over the system. A barrel-to-barrel horizontal separation of at least 10 feet shall be maintained between water main and sewers.

All water mains shall be installed from property line to property line of all new developments along all abutting roads, streets and at other locations where the Director has determined that future extension will be necessary.

A minimum horizontal distance of 10 feet shall be provided from any building wall line or footing line to the center line of the water main.

Water mains shall be located outside of paved areas whenever possible.

Interconnected water mains.

All water mains exceeding a maximum length of 600 feet shall have a minimum of two connections to a source of supply.

The maximum length may be exceeded, provided that future service will eliminate the dead end. Future service will be as defined in the Township's Water Distribution Master Plan.

Size.

Water main sizes shall conform to the Township's Water Supply Distribution System Master Utility Plan.

Unless specified otherwise in the above-mentioned Master Utility Plan, feeder mains 12 inches or larger in diameter shall be provided on 1/4 section line roads, county primary roads, collector streets, and elsewhere as design dictates.

Water mains for new development.

All water mains for new development shall have the following minimum sizes:

	Type of Development	Minimum Size (inches)
	Residential	8
	Commercial/office	12
	Industrial	12

Water mains must be sized to provide fire flows of at least 1,500 gpm in single-family detached residential zoning; 2,500 gpm in apartment, cluster residential zoning and similar areas; and at least 4,000 gpm in office, industrial and shopping center zoning which shall be determined by the Director. A minimum of 20 psi residual pressure shall be maintained throughout the entire system during these flows.

The minimum pipe size for all fire hydrant leads shall be six inches. Maximum length for all six-inch water mains is 50 feet. No service connection shall be made to a fire hydrant lead.

Easements.

All water mains, fire hydrants, valves, service valve boxes and other appurtenances shall be located within a twenty-foot-wide easement, centered on the water main, and dedicated to the Township.

Easements for possible extensions shall be provided to the property lines at locations designated by the engineer.

Easements shall be extended to a point 10 feet beyond all hydrant leads.

All easements shall be granted to the Township prior to the issuance of a final occupancy permit.

Soil conditions.

When required by the Director, exploratory borings shall be provided by the developer. Boring locations shall be indicated on the plans. Boring logs and soil analysis shall be submitted to the Township.

Water main design, relative to pipe bedding and locations, shall reflect the proper selection of materials and construction method compatible with the field conditions. Areas which show unsatisfactory ground material for pipe bearing or possible chemical deterioration due to soils shall be avoided, or the pipe shall be suitably installed on adequately designed bedding and/or in protective wrap or coating.

Materials.

Pipe and fittings. Pipe for open cut applications shall be ductile iron. Pipe for directional drill applications shall be ductile iron, HDPE, or PVC. No secondhand material or salvaged material shall be permitted.

Ductile iron.

Ductile-iron pipe water main shall meet all the requirements of the latest revision of the AWWA/ANSI C151/A21.51. Pipe shall be furnished in eighteen-foot or twenty-foot lengths, unless otherwise required. Pipe shall be double cement-lined and seal coated with an approved bituminous seal coating accordance with AWWA/ANSI C104/A21.4. A manufacturer's certificate shall be provided to the Township, certifying that all pipe delivered meets all specification requirements. The pipe shall meet the thickness class requirements shown in the table below:

	Size (inches)	Class
	6	350
	8	350
	10	350
	12	350
	14	300
	16	300
	18	250
	20	250
	24	250

Push-on joints shall meet all requirements of AWWA/ANSI C111/A21.11. Push-on joints shall consist of a ductile-iron bell provided with a recess to receive a circular molder rubber gasket to effect the joint seal. A rubber gasket and sufficient lubricant to assemble the joint shall be furnished with each joint. The lubricant shall have no deleterious effect upon the color, taste or odor of potable water and shall not be corrosive to either the pipe or gasket. Pipe furnished with push-on type joints shall be equal in strength and leak tightness to pipe furnished with mechanical joints as specified when installed under identical conditions and shall meet all other requirements of these specifications. In addition to the above requirements, the gasket and lubricant shall conform to the latest revision of AWWA/ANSI C111/A21.11.

Bolts and nuts for buried service shall be made of noncorrosive, high-strength, low-alloy steel having the characteristics specified in AAWWA/ANSI C111/A21.11. Bolts and nuts shall also be Cor-Blue T-Bolts with a ceramic-filled, baked-on carbon resin.

Flanged joints shall conform to ANSI B16.1 Class 125.

Ductile-iron or cast-iron fittings shall meet all the requirements of the latest revision AWWA/ANSI C110/A21.10 for full body fittings and AWWA/ANSI C153/A21.53 for compact fittings (three inches through 16 inches) for a minimum working pressure of 250 psi and be of the mechanical joint type. Plugs, where shown on the plans, shall be solid mechanical joint plug type.

All ductile-iron pipe and fittings shall be poly-wrap encased. The polyethylene encasement to be used with ductile-iron pipe and fittings shall be manufactured in accordance with the specifications and requirements of AWWA/ANSI C105/A21.5. Encasement shall be a linear low-density polyethylene film with a minimum thickness of 8 mils. The polyethylene encasement shall be installed in accordance with the specifications and requirements of AWWA 600. Overlap and taping requirements shall be per manufacturer specifications.

[7]

Ductile-iron pipe for directional drill applications shall utilize one of the following approved pipe joints: American Snap-lok Flex-Ring, Clow Super Lock or U.S. Pipe TR Flex.

HDPE.

HDPE pipe and fittings shall be high-density polyethylene plastic pipe, DR-9, DIPS, manufactured in accordance with the specifications and requirements of ANSI/AWWA C906 for use with potable water. All pipes shall have a blue strip to indicate use with potable water.

Materials used for the manufacturing of HDPE pipe and fittings shall be extra-high molecular weight, high-density PE 4710 polyethylene resin meeting the ASTM D3350 minimum cell classification of PE 345464C. The properties of the HDPE material shall be certified by the supplier.

HDPE fittings shall be in accordance with ASTM D3261 (butt fused) and shall be manufactured by injection molding, a combination of extrusion and machining, or fabrication from HDPE pipe conforming to this specification and by the manufacturer of the pipe. The fittings shall be fully pressure rated and provide a working pressure equal to that of the pipe with an included 2:1 safety factor. The fittings shall be manufactured from the same base resin type and cell classification as the pipe itself. The fittings shall be homogeneous throughout and free from cracks, holes, foreign inclusions, voids, or other injurious defects.

Mechanical fittings including flanged joints, restrained mechanical joints used with polyethylene pipe shall be specifically designed for restrained mechanical joints, or tested and found to be acceptable for use with polyethylene pipe by the fitting manufacturer.

HDPE pipe shall only be used in directional bore applications.

PVC, C900 or C905.

Fusible PVC plastic material for pipe shall conform to AWWA C900 or C905, DR-14 (C900) OR DR21 (C905), DIPS, ASTM D1784, and cell classification 12454. Compound formulation shall be in accordance with PPI TR-2/2006. Fusible PVC shall be manufactured in forty-foot nominal lengths and shall be blue in color.

Pipe shall be manufactured with 100% virgin resin. Pipe shall also have 0% recycled plastics content and shall not consist of any rework compound, even that obtained from the manufacturer's own production using the same formulation.

Acceptable ductile iron mechanical fitting for use with fusible PVC pipe shall include standard ductile iron fittings conforming to AWWA/ANSI C110/A21.10 or AWWA/ANSI C153/A21.53 and AWWA/ANSI C111/A21.11. Restrained connections to fusible PVC pipe may be made using a restraint gland product for C-900 or C-905 DIPS sizing to be Mega-lug, Series 2000PV by EBAA Iron or approved equal.

Sleeve-type mechanical couplings shall be manufactured for use with PVC pipe, shall be restrained or by acceptable sleeve-type mechanical joint coupling for a restrained type coupling for transition between PVC, C-900/C-905 pipe and ductile-iron pipe shall be EBAA Iron Series 3800 or approved equal for applicable size of pipe as shown on plans.

PVC pipe shall only be used in directional bore applications.

Pipe shall be marked per AWWA C900 or AWWA C905 as specified on the plans and shall include, as a minimum:

[a]

Nominal size.

[b]

PVC.

[c]

Dimension Ratio, Standard Dimension Ratio or Schedule - DR-14 (C900) OR DR-18 (C905), DIPS.

[d]

AWWA pressure class or rating.

[e]

AWWA Standard designation number.

[f]

Extrusion production-record code.

[g]

Trademark or trade name.

[h]

Cell Classification 12454 and/or PVC material code 1120 may also be included.

§ 72-26 Valves.

General.

A tapping sleeve, valve and well shall be provided at every connection to existing water mains unless otherwise approved by the Director. All such connections shall be provided so as not to disrupt the existing water services.

Gate valves shall be used on mains less than 16 inches in diameter. Butterfly valves shall be used on mains greater than 16 inches in diameter.

In general, valves shall be arranged so that no single line failure will require more than 800 feet of main to be out of service, and on feeder mains, valves shall be spaced not more than 1/4 mile apart. Valves shall be so arranged that any section can be isolated by closing not more than four valves. The isolated section shall not include service to more than:

Twenty detached single-family dwelling units.

Thirty multiple units (apartments, condominium units, duplex units, etc.).

Two fire hydrants.

A full-size valve in a gate well shall be provided at every dead end where required by the Director for future extension.

Pressure-reducing valves.

Installation of pressure-reducing valves may be required where two or more pressure districts are to be interconnected. Pressure-reducing valves shall be furnished and installed within a concrete vault.

A line gate valve shall be installed both upstream and downstream of each pressure-reducing valve to permit isolation of the pressure-reducing valve for maintenance or repair. A bypass line of equivalent size pipe at the water main and an additional bypass gate valve and well shall be provided.

Materials. All valves installed under this specification shall conform to the applicable requirements of AWWA C500 and C504 standards governing construction materials and workmanship. Each valve shall carry the name or trademark of the manufacturer. All valves shall have operating nuts that turn clockwise to open.

Gate valves. Gate valves shall be resilient seated and shall have a cast or ductile iron body and bonnet. Valves shall have a minimum non-shock W.O.G. working of 200 psi. The wedge shall be ductile iron or cast iron encased in a bonded-in-place styrene butadiene elastomer covering to form resilient seating surfaces. Stems shall be bronze of non-rising design with double O-ring packing. Joints shall be mechanical joint type. Resilient seated gate valves shall be Series 2500 as manufactured by American Flow Control, or equal.

Butterfly valves. Butterfly valves shall have a cast-iron body, neck and top piece with a minimum non-shock W.O.G. working pressure of 150 psi. Seats shall be Hycarbuna "N" providing leakproof shutoff with the disc and acting as a body liner to prevent corrosion. Disc shall be ni-resist cast iron with a 304 stainless steel shaft rotating in permanently lubricated bearings. Stem seal shall be Hycarbuna "N." Joints shall be flanged. Flanged to mechanical joint adapters shall be provided for each valve. Butterfly valves shall be Groundhog as manufactured by Pratt Valve Company, or equal.

Tapping valves. Tapping valves shall meet the specifications for gate valves except that the valve shall have a flange compatible with the tapping sleeve.

Tapping sleeves. Tapping sleeves shall be full length of heavy-duty stainless steel construction designed for use with the type of pipe to be tapped. Tapping sleeve body shall be 18-8 Type 304 stainless steel. Bolts shall be 304 stainless steel. Gaskets shall be full circumferential SBR compounded for water service. Tapping sleeve shall contain a test plug to assure seal prior to tapping. Tapping sleeve shall be JCM Industries type 432; Romac Industries, Type SST; or equal.

Valve boxes. Valve boxes shall be of cast-iron construction. They shall be of three-piece, screw-type adjustment design. All valve boxes shall be of three-piece, screw-type adjustment design. All valve boxes shall be installed flush with the top of the proposed site grade. Cover shall be designed to be removed easily to provide access to the valve. Valve boxes shall be EJIW 8560 with number 6 base, or equal.

Corporation stops. Corporation stops used for insertion into mains shall be Mueller Type B-25000, Ford FB600 or McDonald 4701B. All stops shall have bronze cast bodies, keys, stem washers and nuts. Inlet threads shall conform to the latest revision of AWWA C800. The outlet connection shall be able to receive the flared end of the copper service pipe.

Post indicator valves. Post indicator valves shall meet the specifications for gate valves.

(8)

Post indicator posts. Post indicator posts shall be manufactured of cast iron and adjustable. The indicator window shall be mounted at a height of 30 inches above grade. Those portions of the post above grade shall have two coats of red enamel. The indicator window shall be masked during paint application to keep window clear. All unpainted surfaces shall have two coats of coal tar pitch varnish. Post indicators shall be Mueller Model A-20806.

§ 72-27 Gate wells.

General.

Riser sections shall be precast reinforced concrete sized as follows:

	Size to Well (I.D.)
Nominal I.D. of Water Main (inches)	Straight Through	Tee/Tap
10 and under	5 feet 0 inches	6 feet 0 inches
12	6 feet 0 inches	6 feet 0 inches
16	6 feet 0 inches	7 feet 0 inches
18 and over	7 feet 0 inches	7 feet 0 inches

A gate well shall be provided for valves six inches and larger (excluding hydrant valves and PIVs).

Brick for grade adjustment of gate wells shall meet the requirements for "medium brick" of the Standard Specifications for Concrete Sewer Brick, ASTM Serial Designation C139, or the latest revision thereof.

Mortar for masonry of plastering outside of gate wells shall be made of made of one part of Portland cement to two parts of sand. Mortar materials and mixing shall correspond, in general, to those for concrete.

Water pipe to gate well connections shall be through 1) a flexible boot which shall be securely clamped into a core-drilled port. Pipe ports shall be core-drilled at the point of manufacture and shall be accurately located within 1/2-inch of the proposed water main center line (Kor-N-Seal); or 2) a self-adjusting mechanical pipe to manhole seal which provides a resilient flexible and infiltration-proof joint (Res-seal); or 3) a flexible rubber wedge firmly rammed into a rubber gasket which is cast into the manhole (Press Wedge II), or equal. All pipe-to-manhole connections shall be installed per the manufacturer's specifications.

Extension stems and stem guides shall be provided in each gate well wherein the valve operating nut is more than five feet below the top of the gate well cover. Extension stems shall extend to within five feet of the top-of-cover elevation.

A one-inch corporation stop shall be installed in the water main on each side of the line valve in each gate well a bronze double-strap tapping saddle (service clamp) shall be installed on taps to concrete pipe.

Materials.

Gate wells shall be constructed of reinforced concrete conforming to the latest revision of ASTM Specifications for Precast Reinforced Concrete Manhole Sections, Serial Designation C478 with rubber gasket joints. The bottom section shall be furnished with an integral concrete base.

Gate well steps shall be reinforced polypropylete plastic coated steel. They shall be M.A. Industries, Inc. PS-I-PF, or equal.

Frames and covers shall be cast iron conforming to the Standard Specifications Casting Serial Designation A48, or the latest revision thereof, and shall be 1040 Type A as manufactured by East Jordan Iron Works, or equal. They shall have machined-bearing surfaces and suitable notches for convenient removal of the cover. Covers shall have the letters "NORTHVILLE TOWNSHIP WATER" cast integrally with the cover. All frames and covers shall be coated at the place of manufacturer with coal tar pitch varnish or other approved asphaltum coating.

§ 72-28 Fire hydrants and appurtenances.

Location.

Fire hydrants in subdivisions composed of detached single-family dwelling units shall have a maximum spacing of 500 feet.

Fire hydrants in all multiple, commercial, office, and industrial developments shall have a maximum spacing of 500 feet and shall further be subject to the following requirements:

In general, no part of a building shall be more than 300 feet from a fire hydrant as measured by the unobstructed hose length.

Hydrants shall be located for double coverage in multiple housing developments, but in no case shall they be located less then 40 feet from a single-family residence or 50 feet from any other structure.

Spacing of hydrants around commercial and/or manufacturing establishments shall be considered as individual cases and shall be determined by the Director.

All hydrant spacing shall be subject to review and approval by the Township's Fire Department.

Fire hydrants shall be located at street intersections where feasible. In subdivisions, hydrants shall generally be located on the extended side yard property lines.

A hydrant shall be installed at the end of every dead-end main.

In general, hydrants shall be located in the road right-of-way not more than 10 feet or less than three feet from back of curb.

Fire hydrants in parking areas shall be protected by four steel guard posts or a six-inch-high curb.

All hydrants shall be constructed with a companion gate valve and box.

Materials.

Hydrants shall be EJIW 5BR-250 or AFC Model No. WB-67-250 with breakaway traffic flange and mechanical joint connections.

Fire hydrants shall comply with the latest revision of AWWA Standard, C502. Hydrants shall be compression type to open with the pressure. They shall have a valve opening of 5 1/4 inches and six-inch mechanical joint inlet. Hydrants shall have two pumper connections of four inches with Detroit Fire Department Standard Thread.

Fire hydrants shall have an inside barrel dimension of not less than 8 1/2 inches I.D. from top to bottom. The one-and-one-eighth-inch pentagon operating nut shall open counterclockwise.

All nozzles shall be on a removable head with a flange so that they may be rotated by changing the position of the flange.

Hydrants shall be fully bronze mounted, including the top of the operating stem where it passes through the double O-ring seal in the bronze packing gland. The forged operating stem in the base and the valve seat shall also be of bronze. The molded valve shall be of composition rubber, and the cast-iron valve clamps shall be packed with O-ring seals and held right to the stem by a threaded bronze locknut, anchored with set screws.

(e)

Hydrant shall be designed for 150 psi working pressure and tested to 300 psi. Those portions of the hydrant above grade shall have two coats of red enamel. All unpainted surfaces shall have two coats of coal tar pitch varnish.

(f)

Depth of bury is six feet six inches from the bottom of the connection pipe to the grade line on the hydrant.

(g)

Drain hole shall be plugged.

(h)

Each hydrant shall be equipped with one integral stortz connection on the right nozzle when facing the hydrant. The Stortz connection shall be a five-inch connector and shall be manufactured by Harrington, Inc. per HIHS trademark.

Valve boxes shall be of cast-iron construction. They shall be of three-piece, screw-type adjustment design. All valve boxes shall be installed flush with the top of the proposed site grade. Covers shall be designed to be removed easily to provide access to the valve. Valve boxes shall be EJIW 8560 with number 6 base, or equal.

§ 72-29 General.

Special crossings. Ductile-iron pipe, Class 54, shall be used for water mains as follows:

Railroad crossings: within an encasement pipe specified by the railroad for the entire width of the right-of-way, plus 20 feet. Details shall include encasement pipe thickness and diameter, water main bedding, and complete pressure grout of the encased water main.

Stream crossing. Ball joint river pipe shall be used unless otherwise approved by the Township.

Road crossings: beneath and 10 feet beyond the edges of the pavement of traveled road.

Filled areas: throughout the full length and extending 10 feet beyond each end of the fill area into undisturbed soil.

Water service.

The basis of design for size shall be considered using a flow rate of 20 gpm per residential dwelling unit. The basis of size other than for residential use shall be determined by the developer's engineer and submitted for approval by the Township prior to submittal of final plans. Minimum size of service shall be one inch. Service connections to the main must be made by the Township. Service shutoff valves must be located within a dedicated easement or road right-of-way.

Water leads shall be not more than 100 feet in length for multiple type uses; the following minimum sizes shall apply:

	Number of Units per Building	Water Service Size (inches)
	4	1 1/2
	12	1 1/2
	16	2
	24	2
	32	3

Service leads shall not be connected to hydrant leads or fire lines.

Service connection materials.

Copper service pipe. Service pipe two inches and smaller shall be copper, conform to the requirements of the Standard Specifications for Seamless Copper Water Tube, ASTM Designation B88, Type K annealed. Connections in copper service pipe, if necessary, shall be made with copper-to-copper union fittings, Mueller No. H-15404, or approved equal.

Curb stops. One-inch curb stops used for service connections shall be Ford B22-444 ball valve, McDonald 6100, Mueller B-25204, or approved equal. Curb stops 1 1/2 inches shall be Ford B22-666, McDonald 6100, or approved equal. Two-inch curb stops shall be Ford B44-777, McDonald 6100, or approved equal. All parts shall be cast from bronze. They shall have an inverted key stop. Both inlet and outlet connections shall be able to receive the flared end of the copper service pipe.

Curb boxes. Curb boxes shall be Extension Type "Arch Pattern" curb boxes, Mueller No. H-10306 or approved equal for one-inch curb stop and Mueller No. H-10310 or approved equal for one-and-one-half-inch and two-inch curb stops. Cast-iron lids shall have the word "WATER" plainly cast on top and shall have a threaded brass plug removable for the inserting of shutoff rod. Bases shall be six feet six inches long extended and shall telescope to not more than five feet six inches. The shutoff rods shall be no longer than two feet.

Saddles. Taps larger than one inch in existing six-inch mains and larger than 1 1/2 inches in eight-inch mains shall be made with saddles. Saddles shall be Smith Blair No. 323, or approved equal.

Tracer wire.

Tracer wire. Tracer wire shall be installed along the top of all water mains. For directional drilling, the tracer wire shall be installed at the same time as the pipe. For open cut construction, the tracer wire shall be installed at a height of not more than six inches above the main line pipe or service leads. Wire shall be extended to all hydrants, blowoffs, dead ends, service leads and post indicator valves. Tracer wire shall be brought to grade, leaving enough excess material to avoid loss or damage to the wire during construction and subsequent activities. Wire shall be trimmed to finish grade following completion of the landscaping.

Offsets. When tracer wire is to be run along short offsets (less than 20 feet), a loop of wire shall be utilized to loop to the end of the offset, bring the loop to grade and terminate it in an approved manner. For service leads and offsets of more than 20 feet in length, or installed by directional drilling method, a splice may be utilized to make the connection at the main. The tracer wire shall then be installed and terminated in an approved manner.

Terminations. Tracer wire terminations shall be made by one of the following methods:

Tracer wire shall be terminated at hydrants by tying off the wire at the head flange, leaving excess material for future trimming following landscape activities.

Terminations at valve/curb boxes, post indicators, valves and blowoffs shall be made with two wraps of wire at grade around the box or pipe, leaving excess material for future trimming following landscaping.

Gate well terminations shall be made by running the tracer wire through the pipe opening in the wall, down to and across the floor to the steps, up the wall and secure to the top step leaving the stub accessible at the casting. Wire shall be run through the gate well such that it does not create a hazard.

Terminations at existing water mains without tracer wire shall be made at the nearest hydrant or gate well as outlined above. If no hydrant or gate well is available, an upper section of valve box shall be installed with the tracer wire stubbed up inside.

Materials.

Tracer wire to be used on open cut pipe shall be AWG No. 12 single-strand copper with blue 30 mil HDPE insulation. Connections shall be made using 3M DBR-09964 wire connectors, or equal.

Tracer wire to be used on directional drill pipe shall be AWG No. 6 stainless steel braded with blue 30 mil HDPE insulation. Connections shall be made per the manufacturer's recommendations.

§ 72-30 Plan requirements.

All construction plans shall be submitted to the Township for water main approval and shall contain, but not be limited to, the following information:

Certification. The plans and specifications shall be prepared under the supervision of a civil engineer registered in the State of Michigan. The title sheet of the plans shall contain the signature and seal of that engineer.

Plan contents. Plans shall consist of a title sheet showing a plan view of the complete job, split plan and profile sheets, and standard detail sheets. Sheet sizes shall be 24 inches by 36 inches.

Title sheet. A title sheet, or the first sheet of a set of plans, shall identify:

Project title.

Location map with North arrow and scale, drawn at a scale not greater than one inch equals 100 feet nor smaller than one inch equals 2,000 feet. Locations of proposed sewers and relationship of general project area to the surrounding area shall be shown.

Overall layout of the water system with valve and hydrant numbers.

Sheet index.

Symbol legend.

List of quantities.

Name, address, phone number and e-mail of proprietor.

(h)

Name, address, phone number and e-mail of designer.

(i)

Plan completion date and all revision dates.

(j)

A statement that the work shall conform to the Township's current standards and specifications.

Plan and profile sheets.

Scale of plan portion of sheets shall be one inch equals 50 feet, or larger, with scale of profile portion of sheet one foot equals five feet vertical or proportionally larger.

Plan portion of sheet shall include at least:

Two bench marks shall be shown on each plan sheet. Plans shall be prepared based on the Michigan South State Plane Coordinates, North American Datum of 1983 (NAD 1983) for the x and y coordinate system and based on the North American Vertical Datum of 1988 (NAVD88) for the z coordinate system.

Existing topography extending 50 feet past the site boundaries, including all existing and proposed improvements. Elevation contours shall be at a minimum of two-foot intervals.

Street names, street and easement width, subdivision names, lot numbers and lot dimensions.

Location, length, size of each section of proposed water main between valves.

Locations of all hydrants, fittings and other water appurtenances and special structures.

Service line location and diameter to all buildings other than single-family detached dwellings.

[7]

Finish grades of all hydrants, gate well rims, and other water structures. Hydrants and gate wells shall be consecutively numbered on the plans.

[8]

"Miss Dig" note.

[9]

Limits of special backfill requirements.

For all water mains 12 inches in diameter and larger, a profile view must be submitted with the plan. The profile sheet shall contain at least the following information:

Size, length, type and class of pipe.

Top-of-pipe elevations and locations of all horizontal and vertical deflection points.

Limits of special backfill requirements.

Profiled elevations over center line of proposed sewer of existing and proposed ground, and pavement surfaces. The existing profile shall be obtained from actual field survey data.

All crossings with other utilities (existing or proposed) with elevations of the top or bottom of the pipe, as appropriate, and shall have "Warning" notes for all gas main crossings in profile.

Finish grade elevations for all gate well castings and fire hydrants.

Detail sheets. Provide Township standard detail sheets consisting of specifications and drawings. Wayne County details shall also be provided, where applicable.

§ 72-31 Construction standards.

All water mains and appurtenances proposed within the Township shall be constructed in accordance with the standards and specification contained herein:

Utility crossings. A minimum of 18 inches of clearance shall be provided between the water main and any existing underground utility, unless otherwise required by the Director. Whenever a main is installed under any existing utility line such as gas, buried electric power, telephone line, sewer or water, provisions shall be made to properly support or distribute any concentrated load to avoid settlement and possible failure of either main. Such provisions shall consist of concrete bedding of the main, complete concrete encasement, or some other method approved by the Director. In addition, water mains passing under sewers shall be protected by providing:

A vertical separation of at least 18 inches between the bottom of the sewer and the top of the water main.

Adequate structural support for the sewer to prevent excessive deflection of joints and settlement of the sewer about the water main, i.e., a concrete saddle under the pipe with a span length extending to undisturbed earth bearing.

Thrust blocks.

Thrust blocks shall be installed at all bends of 11 1/4° or greater, dead ends, trees and hydrants. Thrust by the safe bearing load on the soil. Thrust and safe bearing loads for soils are shown in Tables 1 and 2 below:

Table 1 Horizontal Thrust (pounds)
Main Size (inches)	Tee-Dead-End	90° Bend	45° Bend	22 1/2° Bend
6	4,250	6,000	3,250	1,660
8	7,540	10,670	5,770	2,940
12	16,970	23,990	12,980	6,620
16	30,160	42,650	23,090	11,770
20	47,120	66,650	36,070	18,390
24	67,860	98,000	51,940	26,480
36	152,680	215,920	116,860	59,580

Table 2 Safe Bearing Loads Against Horizontal Thrust
Type of Soil	Safe Bearing Load (pounds per square foot)
Muck, peat, etc.	0
Soft clay	1,000
Sand	2,000
Sand and gravel cemented	3,000
Sand and gravel cemented with clay	4,000
Hard compacted clay	5,000

In muck or peat, all thrust shall be resisted by pile supports driven to solid foundations or by removal of muck or peat and replacement with ballast of sufficient stability to resist thrusts. In all cases, thrust block size and method of thrusting must be approved by the Director before placement.

Minimum cover. Minimum cover over mains shall be six feet zero inches or six feet zero inches below the existing/proposed road pavement, whichever is lower. When installed parallel to a ditch, mains shall have cover of five feet six inches minimum, as measured from the center line of the ditch.

Backfill. Backfill material may be native or Class II granular material, as approved by the Director. Where water main is constructed in pavement areas or where the main is within a one-on-one influence of pavement, compaction testing shall be performed by an independent testing laboratory. Testing shall be performed at intervals of one test per layer per 75 feet of trench or as determined necessary by the Director.

Gate wells.

A minimum of six inches and a maximum of 15 inches height of brick shall be placed on the cone section of all precast structures.

All brick, block, mortar and concrete work shall be properly cured and protected from freezing for a minimum of 48 hours. When the temperature is 49° F. and falling, brick mortar and concrete shall be heated to a minimum temperature of 60° F.

The joint between precast riser sections and the base of the structure shall be set in a full bed of mortar on both the inside and the outside.

All precast section lift holes shall be pointed and plugged, inside and the outside, with mortar.

Hydrants.

Hydrant leads shall have a minimum of 6.0 feet of cover in all areas, including crossings through ditch sections.

Lucas tee shall not be used.

Hydrants shall be carefully plumbed, braced and backfilled so they remain plumb.

All grade, facing, and vertical alignment adjustment of hydrants shall be completed prior to pressure testing and charging of the hydrants.

All hydrants shall be cleaned and painted with a rust inhibitive, oil base paint such as "Rustoleum" or approved equal to the Township's color code prior to acceptance.

The lubricant reservoirs in all hydrants having such construction shall be filled with a lubricant acceptable to the MDEQ and recommended by hydrant manufacturer.

Backfilling around fire hydrants shall be carefully tamped sand in six-inch layers from the center line of the lead main to a height one foot below finished grade.

(8)

Immediately after installation and until the time of acceptance, a burlap sack or equivalent material shall be placed over the hydrant nozzles.

(9)

Fire hydrant nozzles shall be aligned as required by the Fire Marshal.

Acceptance tests.

Conduct of and sequence for tests.

All tests shall be conducted under the supervision of the Director. All water mains, branches and valves shall be poly-pigged for cleaning, disinfected and pressure tested for leakage. A copy of all test results shall be furnished to the Director. The contractor shall furnish all material and labor to provide for an acceptable full-size blowoff to flush the poly-pig out of the main at the far end of the project not connected to the existing system.

The sequence for acceptance testing is as follows:

Connect to system on one end.

Flushing with poly-pig.

Chlorination.

Flushing.

Bacteriological testing.

Pressure testing.

[7]

Connect to system at all other locations.

Flushing.

The first flush of the water main shall be done with the use of a "poly-pig." The connection location and number of poly-pigs required to flush a project will be determined by the Director prior to the installation of the water main. The pig shall be a B-1 poly-pig manufactured by Pipeline Pigging Products or approved equal. The poly-pig shall be constructed of flexible open-cell polyurethane foam with a polyurethane elastomer coating on the rear. The installation and location of all poly-pigs must be witnessed by the on-site construction observer. All poly-pigs must be new and can be used once.

Mains shall be flushed with clean potable water until the water runs clear.

Chlorination.

All new mains and pipe or any existing mains contaminated by the contractor shall be chlorinated to a minimum residual chlorine concentration of 50 parts per million with commercial liquid chlorine solution or approved equal.

The chlorinated water shall be allowed to stand in the mains for 24 hours. At the end of the twenty-four-hour period, the chlorinated water at all parts of the mains shall show a free available chlorine residual of not less than 25 parts per million. If less than 25 parts per million residual is shown at the end of the first twenty-four-hour period, additional chlorine shall be added until a residual of not less than 25 parts per million at all parts of the system is shown after a subsequent twenty-four-hour period. The chlorinated water shall then be removed from the mains and the mains flushed with potable water for bacteriological testing.

Bacteriological testing.

The contractor shall schedule bacteriological sample of the water in the mains for analysis at two different times. The bacteriological sampling will be performed by an independent laboratory hired by the contractor. The first samples will be taken 24 hours after the mains have been satisfactorily chlorinated, flushed and filled with potable water. The second sample will be taken after satisfactory pressure testing, if pressure testing follows chlorination, or at a minimum 48 hours subsequent to taking the first samples.

The contractor shall provide a sufficient number of corporation stops and copper tubing for taking samplers. Samples shall not be collected from hoses or fire hydrants.

Pressure testing.

Testing against valves will not be permitted except for the valve at the one connection made for poly-pigging the water main.

Before applying the specified test pressure, all air shall be expelled from the pipe. If hydrants are not available at high points, the contractor shall make the necessary taps to release the air and insert plugs after the test has been completed, or install corporation stops, and leave them in place after testing.

Preliminary pressure testing of the mains shall be done by the contractor to ascertain if there are any breaks.

Temporary connections (jumpers) between existing water mains and the newly constructed system for testing purposes shall include a reduced zone backflow preventer (Watts 900, Febco 825Y, or approved equal) to prevent backflow and possible contamination of the public water.

(e)

The contractor shall pressure-test sections of water main as sections of 2,000 feet or less unless otherwise authorized by the Director.

(f)

When permitted to test lengths in excess of 2,000 feet, only the allowable leakage from 2,000 feet will be permitted.

(g)

All ductile-iron and PVC C-900/C-905 water mains shall be subject to a hydrostatic pressure of 150 psi based on the elevation of the lowest point in the system. The main shall be maintained under the test pressure for a minimum continuous period of two hours by pumping potable water into the line at frequent intervals. The volume of water so added shall be measured and considered to represent the leakage from the main. No pipeline installed will be accepted until the leakage measured over a one-hour period is less than 0.092 gallon per inch diameter of the pipe per 1,000 feet. All visible leaks must be corrected.

(h)

In the event that the leakage exceeds the specified amount, the main shall be carefully inspected for leaks and repaired as necessary. Any cracked or defective pipe, fittings, valves or hydrants discovered shall be removed and replaced with sound material and the test repeated to the satisfaction of the engineer.

(i)

All HDPE water main shall be pressure tested after the line and all fittings and valves have been installed and before being put into service. Mechanical joint or flange joint connections may be left exposed for visual leak inspection. Pressure testing shall be conducted in accordance with this specification, the standard specification/detail drawings, and the manufacturer's recommended procedure.

Documents required prior to final acceptance. Prior to the acceptance of a water system by the Township, the following documents shall be submitted:

Bill of sale conveying the water system and all appurtenances to the Township.

Construction record drawings in accordance with Article XII of these standards.

Maintenance bond in the amount of 25% of the cost of construction extending for a term of one year after conveyance to and acceptance of the water system by the Township.