[HISTORY: Adopted by the Town Board of the Town of Wallkill 5-10-1990 by L.L. No. 6-1990. Amendments noted where applicable.]
GENERAL REFERENCES
Large water and sewer users — Ch. 82, Art. II.
Sewers and sewage disposal — See Ch. 194.
Street and sidewalk excavations — See Ch. 205, Art I.
Street specifications — See Ch. A251.
A. 
Sewers shall be designed for capacity and flow in accordance with the Recommended Standards for Sewage Works (Ten State Standards).
B. 
No gravity sewer conveying raw sewage shall be less than eight inches in diameter.
C. 
Sewers shall be laid true to line and grade with a uniform slope between manholes. Sewers 24 inches or less shall be laid with straight alignment between manholes.
D. 
Manholes shall be installed at the end of each line; at all changes in grade, size or alignment, at all pipe intersections; and at distances not greater than 300 feet. A drop manhole, with an exterior drop pipe, shall be constructed for a sewer entering a manhole at an elevation of 24 inches or more above the manhole invert.
E. 
Sewers shall be laid at least 10 feet horizontally from any existing or proposed water main. The distance shall be measured edge to edge. Sewers crossing water mains shall be laid to provide a minimum vertical distance of 18 inches between the outside of the water main and the outside of the sewer. The crossing shall be arranged so that the sewer pipe joints will be equidistant and as far as possible from the water main joints. Any deviation from the minimum horizontal and vertical separation distances must be specifically approved by the Orange County Department of Health.
F. 
Prior to beginning the installation of sewers, the developer shall submit to the Commissioner of Public Works or his duly authorized representative the following items for review and approval:
(1) 
Sewer pipe cut sheets.
(2) 
The manufacturer's shop drawing for sewer pipes.
(3) 
The manufacturer's shop drawing for manholes.
(4) 
The manufacturer's shop drawing for frames and covers. The developer shall also submit to the Commissioner of Public Works a projected schedule for sewer installation.
A. 
Sanitary sewer pipe and fittings shall be polyvinyl chloride pipe conforming to ASTM D3034, SDR 35, in sizes four inches through 15 inches and ASTM F679, Type 1, SDR 35, in pipe sizes 18 inches through 27 inches. The joints shall meet the requirements of ASTM D3212. Gaskets shall meet the requirements of ASTM F477.
B. 
Manholes and bases, unless otherwise approved by the Commissioner of Public Works, shall be precast reinforced concrete, constructed in accordance with ASTM C478, latest revision. Precast manhole barrels and cones shall be reinforced concrete with round rubber gasketed joints conforming to ASTM C-361, latest revision.
C. 
The outside faces of precast manholes shall be coated with a bituminous waterproofing material.
D. 
Invert channels shall be smooth and accurately shaped to conform in shape and slope to that of the sewers.
E. 
Precast manhole cone sections shall be constructed with a twenty-four-inch diameter opening.
F. 
No more than two lift holes may be cast or drilled in each section. These lift holes shall be thoroughly plugged with rubber plugs made specifically for this purpose.
G. 
Manhole steps shall be extruded aluminum 6061-T6 alloy with a drop front and safe tread or copolymer polypropylene conforming to ASTM 2146-82, Type II, Grade 43758, with a one-half-inch-diameter Grade 60 steel reinforcement.
H. 
Manhole frames and covers shall be of iron castings and shall be Campbell Foundry Pattern Number 1007C or equal. All manhole covers shall have the inscription "Sewer" in letters three inches tall and raised 1/16 inch.
I. 
Sanitary sewer manholes shall be constructed to meet the resilient connectors requirements of ASTM C-923.
J. 
Built-in-place manholes may be constructed when approved by the Commissioner of Public Works. Built-in-place manholes shall be constructed of a poured concrete base, a minimum of eight inches thick on a twelve-inch compacted gravel base, precast concrete manhole blocks, cement sand mortar, aluminum steps and cast-iron frames and covers.
K. 
Built-in-place manholes shall be constructed only when the temperature is above 32º F., and all work shall be protected against freezing.
L. 
The outside and inside faces of built-in-place manholes shall be plastered and troweled smooth with 5/8 inch of mortar composed of one part cement and two parts sand.
M. 
The outside faces of built-in-place manholes shall be coated with a bituminous waterproofing material.
N. 
Manhole joints, brick work, and voids around penetrations are to be sealed with nonshrink hydrolic cement/water plugs.
[Added 5-26-2016 by L.L. No. 10-2016]
A. 
All excavations for pipe shall be carried six or more inches deeper than the final grade line of the pipe and then brought to grade line with three-quarter-inch clean crushed stone. This three-quarter-inch clean crushed stone shall have a width equal to the width of the trench at the top of the pipe.
[Amended 5-26-2016 by L.L. No. 10-2016]
B. 
The width of the trench at the top of the pipe shall not exceed the diameter of the pipe plus 24 inches. Excavations for manholes shall have a twelve-inch minimum and twenty-four-inch maximum clearance on all sides.
C. 
Materials such as peat or other soft material shall be reported to the Commissioner of Public Works. In the event that rock is encountered, excavation shall be carried eight inches below the bottom of the pipe and gravel shall be used for backfill and tamped thoroughly and rounded to receive pipe.
D. 
The excavation of trenches shall be fully completed a sufficient distance in advance of laying the pipe, but not more than 50 feet unless permitted by the Commissioner of Public Works, and the exposed end of all pipe shall be fully protected to prevent earth or other substances from entering the pipe. The interior of the pipe shall be carefully freed from all dirt or superfluous material as the work progresses.
E. 
The contractor shall remove, by pumping or other means, any water accumulated in the excavation and keep the trench dewatered until the bedding is complete.
F. 
The contractor shall do all bracing, sheathing and shoring necessary to perform and protect all excavation as required for safety or to conform to governing laws.
A. 
No pipes, manholes or other appurtenances shall be backfilled until inspected and approved by the Commissioner of Public Works or a duly authorized representative.
B. 
Backfilling shall be done with approved material, free from large stone or frozen earth.
C. 
Immediately after pipes have been laid, backfilling shall commence. The material surrounding the pipe, the pipe embedment zone, shall be three-quarter-inch crushed stone carefully placed and thoroughly compacted in such a manner that the line and grade of the pipe are not disturbed. Backfill material shall be placed evenly and carefully on both sides and over the pipe in six-inch lifts, and each lift shall be thoroughly compacted until two feet of cover exists over the pipe.
[Amended 5-26-2016 by L.L. No. 10-2016]
D. 
Where the pipe is installed in a utility easement right-of-way, the trench above the pipe embedment zone may be backfilled with material excavated from the trench, if approved by the Commissioner of Public Works and the Superintendent of Sewer and Water. This backfill shall contain no stones larger than eight inches in any dimension. The backfill shall be placed in eight-inch lifts and thoroughly compacted. This backfill will be carried to an elevation 12 inches below finished grade. Four inches of run-of-bank gravel shall be placed on top of the trench, covered by a layer of geotechnical fiber, Tensar SS1 Geogrid or approved equal, covered by seven inches of well-graded DOT Type 2 or Type 4 material, covered by one inch of topsoil and sod.
E. 
Where the pipe is installed in any paved area subject to vehicular traffic, the entire trench (above the pipe embedment zone) shall be backfilled to grade with NYSDOT Item 4, placed in eight-inch lifts and thoroughly compacted.
[Amended 5-26-2016 by L.L. No. 10-2016]
A. 
All pipe for service connections shall be of the same class as the main sewer pipe and shall be capped with standard manufactured plugs until ready for use.
B. 
No pipe shall be cut for connections except when permitted by the Commissioner of Public Works. Wyes, tees or saddles for service connections shall be installed as required.
C. 
The ends of pipe which enter masonry shall be neatly cut to fit the inner face of the masonry. Joints shall not be covered until duly authorized by the Commissioner of Public Works or his duly authorized representative.
A. 
The developer shall perform visual inspection and testing of gravity lines. Test sections shall not exceed 500 linear feet of interceptors, trunks or street mains, including house connections.
B. 
The developer shall notify the Commissioner of Public Works one week prior to the time the system or any part thereof is ready for visual inspection and two weeks prior to the time the system or any part thereof is ready for testing.
C. 
Upon acceptance by the Commissioner of Public Works of any corrections required from the visual inspection, the developer shall perform an infiltration or exfiltration test. An infiltration test shall be performed for those lines where the groundwater level is a minimum of four feet higher than the top of the pipe. Where the groundwater level is lower than four feet above the top of the pipe, an exfiltration test shall be performed. Water testing or air testing may be used for the exfiltration test.
D. 
The rate of infiltration or exfiltration shall not exceed 100 gallons per mile per 24 hours per inch of diameter of pipe. The air test allows a minimum amount of time for air pressure inside pipe to drop from 3.5 pounds per square inch gauge to 2.5 pounds per square inch gauge. The allowable time is a function of the pipe size.
E. 
The developer shall construct all bulkheads and provide weirs or other means of measurement, pumps, water, plugs, fittings, meters, lights, hoses and all else necessary for inspection and testing.
F. 
When performing an infiltration test, the developer shall block off a section of the system not exceeding 500 linear feet and install a measuring device at the downstream end of the test section. Infiltration shall not exceed the allowable amount specified in Subsection D. If the actual infiltration exceeds the allowable infiltration or if there are visible signs of infiltration, such as gushing or spurting streams, the developer shall effect all repairs necessary to make the pipe sufficiently watertight. The section shall be retested until the rate of allowable infiltration is met.
G. 
The water exfiltration test shall be performed between consecutive manholes, after water has been introduced into the section and all air expelled. A stabilization period shall be allowed for the absorption of water. The water level shall then be raised to two feet above the top of the pipe in the upstream manhole. The quantity of water required to maintain this level over a forty-eight-hour period shall be measured. Exfiltration shall not exceed the allowable as specified in Subsection D. If the actual exfiltration exceeds the allowable exfiltration or if there are visible signs of exfiltration from the pipe, the developer shall effect all repairs necessary to make the pipe sufficiently watertight. The section shall be retested until the rate of allowable exfiltration is met.
H. 
Air testing.
(1) 
Air testing may be used instead of the water exfiltration test to measure exfiltration. The section to be tested shall be between consecutive manholes. Each end of pipe and all branches, laterals and wyes shall be plugged and securely braced. The plug at each end of pipe shall have a provision to connect an air hose. Air shall be supplied to the section and monitored so as not to exceed 5.0 pounds per square inch gauge. The air pressure shall be maintained between 4.0 and 3.5 pounds per square inch gauge for at least two minutes to allow the air temperature to come to an equilibrium with the pipe walls. The air supply shall then be disconnected and the air pressure allowed to decrease to 3.5 pounds per square inch gauge. At 3.5 pounds per square inch gauge, the time shall be measured for the pressure to drop to 2.5 pounds per square inch gauge. The following table shows the allowable time for a loss of 1.0 pounds per square inch gauge at an average pressure of 3.0 pounds per square inch gauge.
Pipe Size
(inches)
Allowable Time
(minutes: seconds)
6
2:15
8
3:57
10
4:43
12
5:40
15
7:05
18
8:30
20
9:50
24
11:20
27
12:40
30
14:30
33
15:50
36
17:10
TABLE I
MINIMUM SPECIFIED TIME REQUIRED FOR A 1.0 PSIG PRESSURE DROP FOR SIZE AND LENGTH OF PIPE INDICATED FOR Q = 0.0015
1 Pipe Dia- meter
(inches)
2 Mini- mum Time (min: sec)
3 Length for Mini- mum Time
(feet)
4 Time for Longer Length
(second)
Specification Time for Length (L) Shown (min:sec)
100 feet
150 feet
200 feet
250 feet
300 feet
350 feet
400 feet
450 feet
4
3:46
597
0.380 L
3:46
3:46
3:46
3:46
3:46
3:46
3:46
3:46
6
5:40
398
0.854 L
5:40
5:40
5:40
5:40
5:40
5:40
5:42
6:24
8
7:34
298
1.520 L
7:34
7:34
7:34
7:34
7:36
8:52
10:08
11:24
10
9:26
239
2.374 L
9:26
9:26
9:26
9:53
11:52
13:51
15:49
17:48
12
11:20
199
3.418 L
11:20
11:20
11:24
14:15
17:05
19:56
22:47
25:38
15
14:10
159
5.342 L
14:10
14:10
17:48
22:15
26:42
31:09
35:36
40:04
18
17:00
133
7.692 L
17:00
19:13
25:38
32:03
38:27
44:52
51:16
57:41
21
19:50
114
10.470 L
19:50
26:10
34:54
43:37
52:21
61:00
69:48
78:31
24
22:40
99
13.674 L
22:47
34:11
45:34
56:58
68:22
79:46
91:10
102:33
27
25:30
88
17.306 L
28:51
43:16
57:41
72:07
86:32
100:57
115:22
129:48
30
28:20
80
21.366 L
35:37
53:25
71:13
89:02
106:50
124:38
142:26
160:15
33
31:10
72
25.852 L
43:05
64:38
86:10
107:43
129:16
150:43
172:21
193:53
36
34:00
66
30.768 L
51:17
76:55
102:34
128:12
153:50
179:29
205:07
230:46
42
39:48
57
41.883 L
69:48
104:42
139:37
174:30
209:24
244:19
279:13
314:07
48
45:34
50
54.705 L
91:10
136:45
182:21
227:55
273:31
319:06
364:42
410:17
54
51:02
44
69.236 L
115:24
173:05
230:47
288:29
346:11
403:53
461:34
519:16
60
56:40
40
85.476 L
142:28
213:41
284:55
356:09
427:23
498:37
569:50
641:04
Note: If there has been no leakage (zero psig drop) after one hour of testing, the test section shall be accepted and the test complete. (See Section 7.5.)
(2) 
If the actual time for a loss of 1.0 pounds per square inch gauge is less than the allowable time shown on the above table, the developer shall determine the source of leakage and effect all repairs necessary to make the pipe sufficiently airtight. The section shall be retested until the allowable time is met or exceeded.[1]
[1]
Editor’s Note: Former Subsection I, Final inspection, which immediately followed, was repealed 5-26-2016 by L.L. No. 10-2016.