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HomeMy WebLinkAboutRFP - 8820 DIRECTIONAL BORING AND TRENCHING ON-CALL (2)ADDENDUM NO. 1 SPECIFICATIONS AND CONTRACT DOCUMENTS Description of BID 8820: Directional Boring and Trenching On-Call OPENING DATE: 3:00 PM (Our Clock) November 27, 2018 To all prospective bidders under the specifications and contract documents described above, the following changes/additions are hereby made and detailed in the following sections of this addendum: Exhibit 1 – Questions and Answers Exhibit 2 – Specifications for Pipe Spacers Please contact Pat Johnson, CPPB, Senior Buyer, at (970) 221-6816 or pjohnson@fcgov.com with any questions regarding this addendum. RECEIPT OF THIS ADDENDUM MUST BE ACKNOWLEDGED BY A WRITTEN STATEMENT ENCLOSED WITH THE BID/QUOTE STATING THAT THIS ADDENDUM HAS BEEN RECEIVED. Financial Services Purchasing Division 215 N. Mason St. 2nd Floor PO Box 580 Fort Collins, CO 80522 970.221.6775 970.221.6707 fcgov.com/purchasing Addendum 1 - RFP 8820 Directional and Trenching On-Call Page 1 of 5 Exhibit 1 Questions and Answers Q1: Regarding the sample Light & Power project: a. What is the length of the bore that parallels Taft Hill? b. What is the length of the bore that crosses Evergreen? A1: a. The length of the bore that parallels Taft Hill is 150 feet. b. The length of the bore across Evergreen is 65 feet. Q2: Regarding the sample Traffic project: a. Is it to be bid as 1 caisson? b. How many caissons need dewatered? c. Are we to submit the CDOT permit and traffic control plans? d. Will the City supply the vaults? A2: a. Yes, 1 caisson. b. Only 1 caisson needs dewatered. c. For the sample project, no CDOT permit is required. Typical traffic control plans and setups for bores at an intersection will be required. d. The City will supply the vaults. Q3: Does the conduit that the Contractor may provide need to be UL listed? A3: No Q4: Are there specifications for the pipe spacers? A4: Attached is the specification for the pipe spacers. (Exhibit 2) Q5: What material is the banding? A5: Stainless Steel Addendum 1 - RFP 8820 Directional and Trenching On-Call Page 2 of 5 MINIMUM DISTANCE BETWEEN CONDUITS CONDUIT SIZE MIN. DISTANCE 2 & 2 1.500 2 & 5 1.500 5 & 5 1.500 1.261 MAXIMUM FLOAT FLOAT STOP (2 REQ'D) lb30.000 CASING OD CASING WALL /·469 THICKNESS ____,/' HIDDEN LINES REPRESENT OD OF CONDUIT BELLED ENDS.----f;l----,--+---Jlt 1.813 DIA HOLE FOR 1" VENT PIPE. CORNER IS BROKEN .312 X 22.5' ON ONE SIDE OF BORE SPACER TO AID IN THE WITHDRAWAL OF 1" VENT PIPE. LARGE GROUT OVERFLOW AREA AT THE TOP OF BORE SPACER. MATERIAL: .750 ±.075 THICK HIGH DENSITY POLYETHYLENE (HDPE) SHEETS ARE STRESS RELIEVED COLOR: NATURAL WHITE TENSILE STRENGTH: 3700 PSI, ELONGATION: 550% ltt if--f:,.-4 :--- CORNER IS BROKEN .312 X 22.5' ON ONE SIDE OF BORE SPACER TO AID IN THE WITHDRAWAL OF GROUT INJECTION PIPE. NOTES: 1. USE ONE BORE SPACER FOR EVERY 5 FEET OF DUCT BANK. 2. THE CASING ID MUST BE SMOOTH AND FREE FROM RIDGES, PROJECTIONS AND SEAMS THAT MIGHT IMPEDE THE ROLLING OF WHEELS. 3. INSTALL BORE SPACERS PERPENDICULAR TO CONDUITS TO REDUCE THE TENDENCY OF DUCT BANK TO CORKSCREW. 4. A TROUGH OR FEEDER BRIDGE SHOULD BE CON- STRUCTED AT THE LEADING END OF THE CASING TO SUPPORT SECTIONS OF DUCT BANK AS THEY ARE ASSEMBLED AND PULLED INTO THE CASING. 5. THIS BORE SPACER IS DESIGNED FOR A CASING THAT IS STRAIGHT AND TRUE. 6. IT IS POSSIBLE THAT THE DUCT BANK WILL ROTATE (CORKSCREW). AS IT IS PULLED THRU THE CASING UNLESS AN 'OFF CENTER WEIGHT TECHNIQUE", "GROUT PIPE AND SLOT TECHNIQUE" OR "STABILIZATION CABLES" ARE USED. CONTOURED FLOW H . _:: O :: LE :: (3 REQUIRED) - s __ _,Mhrl--jt- ::_\ 4.653 DIA HOLE THAT CAN BE USED FOR A GROUT INJECTION PIPE OR AS A FLOW HOLE. 7. THIS BORE SPACER WILL ACCOMMODATE THE "SINGLE-END", "FLUSH COUPLED EXTRACTABLE INJECTION PIPE" OR "STATIONARY SACRIFICIAL Page 4 of 5 Page 5 of 5 INJECTION PIPE" METHODS OF GROUT FILLING. 8. IT IS ESSENTIAL THAT THE BORE SPACERS ARE HELD IN PLACE RELATIVE TO THE CONDUIT. REASON: AS THE GROUT IS PUMPED INTO THE CASING, THE COMPARTMENTS FORMED BETWEEN THE BORE SPACERS ARE MORE OR LESS FILLED SEQUENTIALLY, PLACING A TEMPORARY THRUST LOAD ON EACH BORE SPACER. OPENING FOR OPTIONAL 1/2" CABLE TO STABILIZE DUCT BANK DURING INSTALLATION. (2 REQUIRED AS SHOWN) THIS AREA OF BORE SPACER IS OPEN TO PROVIDE IMPROVED GROUT FLOW AND EASE OF ASSEMBLY. (2 PLACES) THE PERIMETER OF BORE SPACER IS SCALLOPED FOR MAXIMUM GROUT FLOW AREA.---- SECURE CONDUITS TO BORE SPACERS BY INSTALLING ONE OF THE FOLLOWING ON EACH SIDE OF EACH BORE SPACER AS SHOWN BY THE PHANTOM LINES: A. 5/8" WIDE X .030 THICK 201 STAINLESS STEEL BANDS & BUCKLES HAVING A MIN. BREAKING STRENGTH OF 1875 LBS. B. 3/4" WIDE POLYPROPYLENE STRAPPING HAVING A 1400 LB BREAKING STRENGTH, 7% MAX. STRETCH, & STEEL SEALS.----------' THIS BORE SPACER DESIGN IS COVERED BY ONE DR MORE PENDING PATENT APPLICATIONS. FURTHER, THIS DRAI.IING AND PROPRIETARY DESIGN IS SDLEL Y THE PROPERTY OF UNDERGROUND DEVICES, INC. AND IS SUBMITTED 1./ITH THE UNDERSTANDING THAT IT 1./ILL BE KEPT IN STRICT CONFIDENCE. FACTORY INSTALLED 3" DIAMETER POLYOLEFIN, WHEEL ASSEMBLY WHEELS ARE RATED AT 300 LBS (2 REQUIRED) UNDERGROUND DEVICES CATALOG NO. BS4669W2 4.500 DIA CLEARANCE FOR OPTIONAL GROUT INJECTION PIPE. SLOT IS CHAMFERED .312 X 22.5' ON ONE SIDE OF BORE SPACER TO AID IN THE WITHDRAWAL OF THE GROUT INJECTION PIPE. THIS INFORMATION IS BASED ON DUR EXPERIENCE TD DATE AND WE BELIEVE IT TD BE RELIABLE. IT IS INTENDED ONLY AS A GUIDE FDR USE AT YOUR DISCRETION AND RISK. WE CANNOT GUARANTEE FAVORABLE RESULTS AND ASSUME ND LIABILITY IN CONNECTION WITH ITS USE DR USE OF THE PRODUCTS DESCRIBED. UNDERGROUND DEVICES CATALOG NUMBER: SCALE: ______ B_S_4_6_6_9_W_2 ____ .... 6.50 LBS EACH---u-- 1 . 000 © FEBRUARY 22, 2008 - ALL RIGHTS RESERVED BY UNDERGROUND DEVICES, INC. (140) 9. THE DUCT BANK MUST BE HELD IN POSITION AT BOTH ENDS TO ACCOMMODATE POSSIBLE UNEVEN THRUST LOADS THAT MAY BE GENERATED DURING THE GROUTING OPERATION. 10. WHEN FILLING THE AREA BETWEEN THE CONDUITS AND CASING WITH GROUT, TAKE CARE NOT TO EXCEED THE HYDRAULIC COLLAPSE PRESSURE OF THE CONDUITS. 11. DEPENDING ON THE GROUT SPECIFIC GRAVITY AND GROUT FLOW, IT IS POSSIBLE THAT THE DUCT BANK WILL FLOAT TO THE TOP OF THE CASING. 12. ACTUAL QUANTITY OF GROUT USED SHOULD BE MEASURED AND RECORDED. With FULL 8 Ea. COMPLEMENT 5" & 4 Ea. 2" BORE EPC40 (SPACER Sch.40) PVC Conduits In A 30.000 OD X .469 Wall Steel Casing m See At Left 1m11111:A!an Armslron w11:B.Muehlenbeck lllflllll: Don McCo 111: 2-22-08 MM111: 111111 C 7-5-16 NORTHBROOK, UNDERGROUND ILLINOIS 60062 DEVICES - PHONE: (847) , 205-INC 9000 . DRAWINGN:PAGE 90 -4669 · 1 OF 3 Exhibit 2 Page 3 of 5