02-11-1985 Council Packet - Laserfiche WebLink

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tions exist, the Contractor shall excavate to a depth to insure proper founds- t ion. The excavation shall then be brought tip to pipe foundation grade with gravel stabilization thoroughly compacted. CA-4 aggregate conforming to the Minnesota Highway Department Specification 3137 or other approved aggregate shall he used for the stabilization material. Class 4 gravel may be used if no water table exists. Weight slips will be required for measurement and pay- ment. No pavment will he made for rock installed without the knowledge or consent of the Engineer nor will pavment be made for rock installed only for dewatering purposes. Payment will be made for only the authorized gravel stabilization placed under the pipe. It shall be the Contractor's responsibility to notify the Engineer of changing soil conditions which may he of poor bearing capacity and when organic soils are encountered. Where utilities are placed on unstable soils without notifi- cation of the Engineer, the Contractor shall be responsible for all repairs and correction of the installation without further compensation. 24,000.3.E6. Pipe- Clearance in Rock: Ledge rock, boulders and large stones shall be removed to provide la clearance of at least 6 inches below the outside barrel of the pipe and to a clear width of 6 inches on each side of all pipe and appurtenances for pipe 15 inches or less in diameter; for pipes larger than 15 inches, a clearance of 6 inches below and a clear width of 9 inches on each side of outside diameter of pipe shall he provided. Adequate clearance for properly jointing pipe laid in rock trenches shall be provided at bell holes. 24,000.3.E7. Pipe Foundation in Rock: Where rock is encountered, the space between the rock and the pipe surfaces shall be backfiiled with a sand cushion of suitable granular base material thoroughly tamped. The material from the trench excavation, other than rock, boulders, Feat, silt or other unacceptable material, shall be considered as suitable material. No additional compensa- tion for placing or tamping this material shall be allowed. However, in the event that additional material must b,2 hauled in, the hauling of the suitable granular material for the pipe bed shall be paid for on a weight basis only when ordered placed by the Engineer. 24,000.3.F.$. Solid Rock Excavation Defined: Solid rock excavation shall in- clude such rocks as are not decomposed, weathered or shattered and which will require blasting, barring, wedging or use of air tools for removal. Under this classification shall be included the removal of any conere r, or masonry structures (except concrete pavement, curb, getter an,l sidewalk) or boulders exceeding on.. -ha i f ( 1 /2) cubic yard in volume that may hp enc--,ntercd in the work. 24,000.3.F.9. Blasting Procedure: Blasting for exacavat.ion will not proceed until the Contractor has notified the Engineer of the necessity to do so, such notification shall in no manner relieve the Contractor of the �,azaria and lia- bility contingent in blasting operations. The hours of blasting will be fixed by the Owner. Any damage caused by hlastink shall be repaired by the I:ontrac- tor at his expense. The Contractor's methods of pr.ict-dure relative to blast- ing %hall conform to local and state lawq anti ;aunicipal nrdlnancrR. '0410-N 2/R4/4554b ropvright IQ94 Bonestrou, Roliene, Andotltk b Associates, Inc.