1. Identify and mark out any utilities in or around the excavation area. 2. Safely excavate to expose the broken chilled water line, following all applicable OSHA standards for safe excavation including sloping, benching, shoring, or shielding. Excavation site must be properly protected at all times. 3. Isolate the affected line and drain any excess water in coordination with OPWDD site representative. 4. Properly cut out the compromised section of pipe taking care not to allow debris into the pipe. Clean out any foreign material in pipe that could get caught in the systems strainers. 5. Make the repair and support the pipe for re-pressurization. Pipe, fitting, and coupling materials must be compatible with the existing PVC and rated for the chilled water system's pressure and temperature requirements. Provide cut sheets for materials and pipe connection method used. 6. Conduct a hydrostatic pressure test on the repaired section of the pipe at 1.5 times the system's operating pressure (but not less than 100 psi) for no less than 15 minutes, as witnessed by the OPWDD site representative. Address leaks if necessary. 7. Reinsulate the pipe with an appropriate material for the conditions. 8. Re-bed the pipe and backfill with soil in uniform layers 12 inches thick. Soil must be free from rocks larger than 3” and will be compacted every 12 inches. Restore damaged landscaping.
