California Code of Regulations
Title 23 - Waters
Division 2 - Department of Water Resources
Chapter 6 - Encroachments
Article 6 - Requirements for Specific Types of Encroachments
Section 612.63 - Casing Requirements

(a) Pipelines carrying hazardous material or pollutants, including, but not limited to: oils, gasoline, sewage, contaminated waters, non-potable waters, shall be encased. Pipelines transporting potable water do not require casings.

(b) Pipelines attached to a bridge or an overchute shall be sleeved through the aqueduct embankment and protective dikes.

(c) The applicant shall provide a 5/16-inch minimum thickness steel casing pipe. The inside diameter of the casing pipe shall be a minimum of 4 inches larger than the maximum outside joint diameter of the carrier pipe. The ends of casing pipes shall be sealed with casing end seals (LINK SEAL or an equivalent approved by the Department). The casing shall be leak tested in the presence of a Department inspector to verify that it is sealed.

(d) The sleeve or casing for pipelines buried beneath the primary and secondary operating roads along the open canal embankments shall be fully concrete encased through the canal embankments, unless stamped engineering calculations are submitted to the Department that verify that encasement is not required.

(e) A minimum two (2)-inch inner diameter drain line shall be provided at the low end of the casing pipe and drain away from the aqueduct. The drain line shall terminate in a valve protected from vandalism and the drain valve shall be maintained in the open position. A three (3)-inch galvanized steel guard post (Schedule 80 or better) shall be installed adjacent to each drain line. The posts shall extend five (5) feet above the ground and eighteen (18) inches below ground. The bottom of the posts shall be embedded in at least one (1) cubic foot of concrete. A sign shall be installed containing the name of the owner/operator, contents of the pipeline, utility identification, and emergency contact telephone number.

(f) Casing couplings shall be a flexible single and expansion type coupling equivelant to Smith Blair Type 611 or Dresser Style 63 that will account for a differential temperature range of 140 degrees Fahrenheit. The casing shall be mounted to the bridge or overchute by placing Teflon pads around the casing between the wall hanger brackets and U-bolts. The U-bolts should be installed with lock nuts at the top of the bracket and below the top angle and tightened to a point that stills movement.