§ 31-05 Standards for Installation of Sewer Connections.
RCNY § 31-05
(a)General Requirements. All new sewer connections shall comply with this Rule. All work must be done in such a way that the connection to the sewer will not result in any protrusion beyond the internal wall of the sewer.
(b)Specific Requirements.
(1)Sewer connections may be made to available existing sewers, drains, or approved outlets, upon the issuance of a permit.
(2)New sewer connections shall have a minimum of four (4) feet of cover unless the DEP grants approval for a lesser cover. No cover above a sewer connection less than two and a half (2.5) feet shall be permissible. Sewer connections with less than three (3) feet of cover must be encased in concrete.
(3)Connections to sewers supported by piles must be ductile iron pipe Class fifty-six (56), on broken stone with push on joints. The thickness of the broken stone bedding shall be a minimum of nine (9) inches.
(4)Where the replacement or repair of an existing sewer connection results in damage or defect to adjacent or connected facilities, the Commissioner, upon being notified of such damage or defect, may order the Licensed Master Plumber to investigate and effect any repairs to the adjacent or connected facilities that may be required at such plumber's own expense. Representatives of adjacent or connected facilities shall be mailed copies of the Commissioner's order.
(5)Catch basin connections to storm or combined sewers of forty-eight (48) inches in diameter or smaller shall be made to existing or new manholes. For sewers larger than forty-eight (48) inches in diameter, the catch basin connections shall be made to existing manholes, if available, or directly to the sewer. Details of all other methods of connections shall be reviewed and approved by the DEP. All work must be in accordance with any Builders Pavement Plan, approved by the City.
(6)New sewer connections shall be made to existing spurs fronting the property.
(7)In cases where no spurs exist, or connection to an existing spur is not feasible, one of the following methods of connection shall be used: (i) For six (6) inch diameter sewer connections to six (6) inch diameter sewers or drains, or eight (8) inch diameter sewer connections to eight (8) inch diameter sewers or drains; when connecting to clay sewers, three (3) sections of the existing sewer or drain shall be replaced with two (2) straight pipe sections and a central spur piece; when connecting to sewers or drains of other materials, minimum one section shall be replaced with three (3) shorter segments with minimum length of four (4) feet each.
(ii)For six (6) inch diameter sewer connections to eight (8) inch diameter sewers or drains, or eight (8) inch diameter sewer connections to ten (10) inch diameter sewers or drains, if the existing eight (8) or ten (10) inch diameter sewer or drain is not supported by a concrete cradle, the connection method described in subparagraph (i) of this paragraph (7) shall apply. For sewers or drains on concrete cradles, a minimum of two (2) feet in length of the existing sewer or drain on either side of the point of connection shall be encased in concrete. The concrete encasement shall follow Department sewer design standards. The concrete shall be allowed to set for forty-eight (48) hours, after which time, core drilling shall be performed.
(iii)Core drilling to install a spur into an existing sewer or drain shall only be performed with an approved coring machine. Such coring shall be made at the one (1) or two (2) o’clock or ten (10) to eleven (11) o’clock position as described in paragraph (9) of this subdivision (b). The cored portion of the sewer shall be retained and submitted to the Inspector. Core drilling shall only be permitted in the following circumstances: (A) where the new sewer connection is six (6) inches in diameter and the existing sewer or drain is ten (10) inches in diameter or larger; (B) where the new sewer connection is eight (8) inches in diameter and the existing sewer or drain is twelve (12) inches in diameter or larger; (C) where the new sewer connection is ten (10) inches in diameter and the existing sewer or drain is fifteen (15) inches in diameter or larger; (D) where the new sewer connection is twelve (12) inches in diameter and the existing sewer or drain is eighteen (18) inches in diameter or larger; and (E) where the new sewer connection is fifteen (15) or sixteen (16) inches in diameter and the existing sewer or drain is thirty (30) inches in diameter or larger.
(iv)Any sewer connection ten (10) inches in diameter to existing sewers or drains less than 15 (fifteen) inches in diameter; or sewer connection twelve (12) inches in diameter to existing sewers or drains less than eighteen (18) inches in diameter; or sewer connection fifteen (15) or sixteen (16) inches in diameter to existing sewers or drains less than thirty (30) inches in diameter, shall be made only to an existing or proposed manhole. For sewer connections larger than sixteen (16) inches in diameter, the applicant shall submit a detail of the proposed method of connection to the Department for review and approval, and a manhole must be constructed in accordance with Department standards to accommodate the connection. When a non-standard manhole is required, an additional Department review is required. No new manhole may be built on a Department sewer within 50’ of an existing manhole without proof of substantial hardship.
(8)Core drilling. Core drilling shall be performed in accordance with the following requirements: (i) Clay or Cement Sewers or Drains. A six (6) inch thick concrete encasement on top and bottom of the existing sewer or drain for a minimum of four (4) feet length along the existing sewer shall be provided. The concrete encasement shall be allowed to set for a minimum of twenty-four (24) hours before the core drill may be performed.
(9)Installation of a spur on the existing sewer or drain shall be performed in accordance with the following requirements: (i) A hole shall be core drilled with an approved core drilling machine to produce a smooth hole equal to the inside diameter of the sewer connection. A tap saddle/tee made of cast iron shall be installed and bonded to the existing sewer or drain with a quick setting two-part mix of epoxy adhesive that will harden in four (4) to seven (7) hours.
(10)Should unanticipated field conditions necessitate a different method of construction than that shown on the certified sewer certification application, such method shall be submitted for review and approval by the DEP, prior to any work being performed.
(c)Materials.
(d)Manhole Connections.
(e)Seepage Basins, Catch Basins and Catch Basin Connections.
(f)Trench Excavation.
(g)Backfilling.
