Mission Viejo Municipal Code Div. 17 Steel Casing Pipe

Steel casing pipe shall be installed at the locations and to the lines and grades indicated on the plans and as herein specified. All work shall conform to the specifications and requirements of the state division of highways, the county road department, the city and/or the railroad company involved. It shall be the applicant's responsibility to secure all necessary permits for start and prosecution of casing pipe installation.

(Ord. No. 88-12, § 9(7-4-371), 6-27-88)

(a) The equipment, materials and methods used for the construction of the complete installation of the casing pipe and the sewer pipe within the casing shall be determined by the applicant to the extent that the final and completed installation receives the approval of the department and is consistent with the intent of this division.

(b) The applicant may present an alternate detailed proposal in lieu of the methods and materials specified herein to jack or bore casing pipe under the locations as shown on the plans. Such proposal shall be subject to the sole approval of the department and shall be presented 14 calendar days in advance of the work to allow adequate time for checking and must be in accordance with all the conditions set forth in the necessary permits.

(Ord. No. 88-12, § 9(7-4-372), 6-27-88)

(a) Steel casing pipe of the minimum size and thickness specified herein shall be installed in place by jacking and/or boring methods without the use of water or air at the locations shown on the plans, and to grades required to install the sewer carrying pipe. The applicant's attention is called to the fact that extreme care will be required in placing the casing pipe so as to permit the construction of the sewer pipe to the lines and grades shown on the plans. The sewer mains are gravity flow, designed at grades which will permit variance from the lines and grades as shown. It shall be the applicant's responsibility for choosing a size of casing, at or above the minimum specified, in order that the jacking may be done with a sufficient degree of accuracy to permit installation of the sewer carrying pipe to the grades shown on the plans.

(b) In general, excavated material shall be removed from the casing as jacking progresses and no accumulation of excavated material within the casing will be permitted. Should appreciable loss of ground occur, the voids shall be back-packed promptly to the extent practicable with soil cement. Upon completion of the jacking operation and before the carrier pipe is installed, all voids around the casing shall be filled by grouting through holes drilled through the casing. The grout shall be a lean mixture of sand and cement placed at low pressures. After the carrier pipe has been installed, the annular space between the carrier pipe and the casing pipe shall be backfilled with lean grout under pressure. Sand will not be permitted for such backfilling. Lean grout shall be one part of portland cement to not more than four parts of sand by volume. Grout at each end of the casing pipe shall be finished neat and flush with pipe end.

(Ord. No. 88-12, § 9(7-4-373), 6-27-88)

Vitrified clay sewer pipe conforming to the specifications of division 6 of this chapter, shall be installed within the casing pipe to the lines and grades shown on the plans. Mechanical compression joints shall be used on all vitrified clay sewer carrier pipe installed within casing pipe. The carrier pipe shall be supported on wood or metal skids prior to backfilling in such a manner as to relieve the pipe bells from all load and bearing. Prior to backfilling as specified above, such sewer carrier pipe shall pass a successful test for leakage as provided in division 21.

(Ord. No. 88-12, § 9(7-4-374), 6-27-88)