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HomeMy WebLinkAboutGrading Attachment for Pipeline ConditionsCONDITIONS TO ALL PIPELINE GRADING AND INSTALLATION PERMITS FOR GARFIELD COUNTY 1. All work to comply with ASME B31.8-2007 and manufacturers recommendations for steel pipelines. 2. All work to comply with ASTM D2774 for pressure poly pipe installations and ASTM D2321 for gravity flow poly pipe installations. Follow all manufacture’s recommendations. 3. Minimum cover over all installations is 48 inches. 4. Properly compacted backfill is required between parallel pipes in a common trench. Provide adequate space between the pipes to achieve adequate compaction. 5. The trench bottom should have stable (firm) soils and free of protruding rocks. A minimum of 4 inches of Class I bedding is required under poly pipe. 6. Compaction requirements are 85% standard Proctor for Class I and Class II backfill (including padding), 90% standard Proctor for Class III backfill, and 95% standard Proctor for Class IVA soils and for all backfill under and within 6 feet of roads. Maximum lifts of 12-inches for Class I, 8- inches for Class II, and 6-inches for all other classes. Compaction test are required every 200 feet until compaction practices meet these requirement. Compaction once established must be spot checked every 400 ft. or when fill materials or processes changes. 7. Padding (shading) of all pipes is required a minimum of 24-inches around the pipe with 12- inches of padding over the pipe. Padding particle size of no greater than 1 1/2 -inch for a 10- inch to 15-inch diameter pipe. If the pipe is 16-inches or larger, the 2 inch maximum particle is allowed. Inspection Reports shall be completed to verify the above specifications. In addition the reports shall show: • Name of the inspector, date, time on site, and weather; • A description of the work in progress; • Summary of conversations with contractors/others; • Summary of sampling and testing activities; • Verification of pipe material, grade and alignment; • Observation of pipe installation, placement of padding and backfill materials, and trench excavation methods; • Verification of proper pipe storage, handling, and installation procedures are followed; • Copies of all pressure integrity, non destructive X-Ray and compaction test; and • Pictures to document the construction. Stormwater management plans require routine inspections during all phases of work every 14 days and after a precipitation-related event.