(A) Plan submittal procedure. For village approval of sanitary sewer plans, the applicant shall furnish the Village Clerk with four sets of the sanitary sewer plans along with any required fees and deposits. The Clerk will then stamp three sets as authorized to be reviewed, and the applicant will submit these copies to the Village Engineer for review, comments and/or approval. A detailed cost estimate must be submitted also at this time. The reviewing engineer shall review the plans for conformity to the standards set forth herein and certify that they are consistent with the overall utility plans of the village. After his or her review, he or she will return one of the sets with appropriate comments to the applicant and one to the Village Clerk. The applicant, after making any changes requested on the set of plans returned to him or her, shall submit a sufficient number of the revised plans to the Village Engineer for final approval. The Engineer shall review these revised plans for conformity to the comments mentioned heretofore and, if they have been properly done, will transmit a sufficient number of sets to other local and state reviewing agencies.
(B) Design standards.
(1) The following notes shall appear on the plans:
(a) All workmanship and materials shall be in accordance with the current standards and specifications of the village and Oakland County DPW. All sanitary sewer construction shall have competent full-time inspection provided by the local unit of government. Construction deposits and inspection deposits as set by the village must be made prior to the beginning of any work.
(b) It shall be the contractor’s responsibility to verify and/or obtain any information necessary regarding the presence of underground utilities which might affect this project.
(c) All trenches under or within four inches of existing and/or proposed pavement shall be sand backfilled to the elevation shown on plans (95% maximum weight density).
(d) Downspouts, weep tile, footing drains or any conduit that carries storm or ground water shall not be allowed to discharge into this sanitary sewer.
(e) No sewer installation or portion thereof shall have an infiltration exceeding 200 gallons per inch diameter per mile of pipe length per 24-hour period.
(f) Each wye or end of house lead shall contain factory installed premium joint material of a type suitable and approved for use with house lead joint specified.
(g) Whenever existing manholes or sewer pipes are to be tapped, drill holes at four inches center to center around the periphery of the opening to create a plane of weakness joint before breaking section out. Non-shrink grout shall be used to seal the opening and a concrete collar shall be poured 12 inches thick around the pipe and extended 12 inches beyond the opening.
(h) For the purpose of testing infiltration, a temporary 12-inch deep sump shall be provided in the first manhole above the connection. Sump shall be filled in by the contractor after successful completion of the infiltration test up to the standard fillet provided for the flow channel. At all connections, provide a water-tight bulkhead with a one-inch diameter pipe through the bulkhead for measuring infiltration immediately upstream.
(i) All house leads shall extend to the property line or the easement line.
(j) At all connections to sewer interceptor system shall be inserted the following note: The contractor shall provide copies to the Village of Oakland County DPW tap permit and the receipts for the required inspection deposits at least 48 hours prior to the start of construction.
(2) Prior to starting any sanitary sewer design, the applicant is encouraged to make use of maps and information available at the village office. It shall be the responsibility of the applicant to verify utility locations.
(3) The following table of minimum slopes for sanitary sewers shall be adhered to:
Size
|
Minimum slope
|
Size
|
Minimum slope
|
8-inch | @ .40% |
10-inch | @ .28% |
12-inch | @ .22% |
15-inch | @ .16% |
18-inch | @ .12% |
21-inch | @ .10% |
24-inch | @ .08% |
NOTE: The minimum allowable size of a sanitary lateral is eight inch diameter. The last upstream run of sewer must be at a slope of 0.60 or greater. | |
(4) A note or detail shall show the type of bedding upon which the sewer pipe shall be installed. Class “B” bedding is the minimum bedding allowable.
(5) The house lead installed with the lateral sewer shall be a minimum of six inches in diameter.
(6) (a) Sanitary sewer manholes spaced as follows:
Diameter of sewer
|
Maximum manhole spacing
|
8 inches to 21 inches | 400 ft |
24 inches to 30 inches | 450 ft |
36 inches to 42 inches | 500 ft |
48 inches and larger | 600 ft |
(b) Sanitary sewers may be placed in an easement in front of the lot. The sewer should be within 15 feet of the right-of-way line. In general, sanitary sewers will not be approved in the rear lot easement. Sanitary sewer manholes must be watertight and shall be precast sections with modified grooved tongue joints with rubber gaskets. Bolted watertight covers shall be used on all manholes.
(7) The following information shall be indicated on the sanitary sewer profile:
(a) Length of run between manholes;
(b) Type of pipe between manholes;
(c) Class of pipe between manholes;
(d) Size and slope of sewer between manholes;
(e) Class of bedding;
(f) Top and invert elevation of all manholes;
(g) Existing and proposed ground elevation above the route of the sewer;
(h) A logical numbering system for manholes shall be included;
(i) Sand backfill stationing shall be indicated on the profile;
(j) The plan view shall show length and size of sewer and ties to the property lines.
(8) Provide a minimum depth from top of curb (or road center line if uncurbed) to the top of any sanitary sewer of 8½ feet at local control points or a minimum of nine feet at locations where the sewer elevation is parallel to the road grade. In all cases, the sewer shall be deep enough to serve, by gravity, a standard depth basement.
(9) Each wye or end of house connection shall have an airtight or watertight plug with the same type of joint as the main sewer. The wye or end of house connection shall be marked by setting a one-inch by two-inch by six-foot oak, ash or cedar stake vertically above the end of the lead. A clay pipe shall be set enclosing the surface end of the marking stakes.
(10) Sanitary sewer pipe shall conform to the following current tentative American Society for Testing and Materials Specifications.
(a) Concrete sewer pipe, ASTM designation: C14XM (extra strength, modified so that minimum crushing strength requirements for all sizes up to and including 12 feet diameter shall be 2400 lb. per lineal foot when tested in the three-edge bearing method).
(b) Reinforced concrete sewer pipe, ASTM designation: C76.
(c) Extra strength clay pipe, ASTM designation: C-700.
(d) Composite ABS plastic and Pearlite concrete truss pipe material as manufactured by Metal Products Division of Armco Steel Corporation or equal shall conform to the requirements of ASTM D-2680-74 or latest revision thereof.
(e) PVC pipe and fittings shall conform to requirements of ASTM D-3034 (SDR 35), latest revision. Deflection of pipe shall be limited to a maximum of 5.0%.
(11) The sanitary sewer shall be installed on the opposite side of the street from the watermain.
(12) House leads shall have compacted sand backfill to within three feet of the edge of the side of the road.
(13) External drop connections are required at new manholes where the outlet pipe is 18 inches or more below the inlet pipe.
(14) Where conditions require tunneling or boring, consult the Village Engineer for specific requirements.
(C) As built plans. Prior to the acceptance of any sewer system and prior to the removal of the outlet bulkhead (except under extenuating circumstances as may be approved by the Oakland County DPW Director) as-built plans shall be provided to the Oakland County DPW and to the Village Engineer.
(O.C. § 5.702) (Am. Ord. 268, passed 9-19-22)
Cross-reference:
Sewer service, see Ch. 52