ADDENDUM #1. PROJECT: Montrose Water Sports Park Construction BID NO: FROM: Scott Murphy DATE: August 15, 2014

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1 ADDENDUM #1 PROJECT: BID NO: FROM: Scott Murphy DATE: Questions and Answers 1. Is angular or rounded rock wanted for this project? Answer: All foundation and pool armoring rock shall be angular. Others used for bank terracing and wing areas should be sub-rounded. 2. Will sandstone boulders be allowed for use on this project? Answer: Dense, durable sandstone boulders may be used above the ordinary high water mark for bank terracing and the like. It shall be the responsibility of the contractor to select a durable stone that will remain structurally stable in this application without any excessive deterioration or weathering. Stone below the ordinary high water mark may not be sandstone and shall be durable, hard stone free from seams and cracks as originally specified in the plans. Stone below the ordinary high water mark shall not have a wear greater than 40 percent when tested in accordance with ASTM C535: Standard Test Method for Resistance to Degradation of Large-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine. 3. Will boulders need to be chinked when set in place? Answer: Yes, all boulders must be bedded and/or chinked and stable as directed in the field by a representative from Recreation, Engineering, and Planning (REP). 4. Is a construction dewatering permit required for this work? Answer: No, contrary to the plan note (see plan revisions below for removal of this note), a construction dewatering permit will not be required for this project. The already-received 401 permit will cover this aspect of the work. Water quality BMPs and the water treatment system will still be required to maintain water quality as specified elsewhere in the plans. 5. Who is responsible for the long-term durability and functionality of the water sports park and its structures? Answer: The professional engineer stamping the structural design of the precast structures and its associated concrete fill, attached components, and structural connections is responsible for the design and structural durability of these concrete structures. The professional engineer stamping the overall plan set, REP, is responsible for the design and functionality of the structure foundation, layout, and adjacent grading and armoring. The contractor is responsible for constructing all of these project elements according to best industry practices in conformance with the plans and field direction from REP. 6. What does the typical winter flow look like on the river? Answer: The typical flow regime for the Uncompahgre River within the project area is included with the 404 permit report posted with the original bid documents. An as-built report and a video from the fish habitat improvement work performed immediately upstream of the water sports park in February 2014 has also been uploaded with this addendum to show what the

2 Page 2 winter time flow generally looks like. Although flows decrease substantially in winter months, it is not known exactly what they will be and the contractor should keep in mind and account for the potential range of flows that may be present within the project area during the work. 7. What is the budget for this project? Answer: The City does not release the engineer s estimate prior to bid opening. However, in general terms, the project budget is between $500,000 and $1,000, Must all working fronts be maintained in a dewatered condition for construction? Answer: The active working front for construction of project elements must be maintained in a dewatered state in order to provide visibility for proper placement of materials and structures. Stream diversion construction, construction of the grade control mattress, and placement of the habitat boulder clusters will be performed in the wet. 9. Which areas and roadways are available for project access and staging? Answer: The project may be accessed and staging areas constructed on either side of the river at the discretion of the contractor. On the eastern side, access would be from existing roadways within Riverbottom Park. Parking and park areas are available for staging with City approval but must be protected or restored to their pre-project condition if used. The cost of this restoration should be included in Line Item 17 on the bid form (Site Restoration and Revegetation). On the western side, the City owns the adjacent property and this is available for project access and staging, although access to this site is relatively difficult. Access is gained from Cerise Park via a windy, narrow crusher fines pedestrian path as shown in Photo 1 and Figure 1 (attached). If this access point is used, it is the contractor s responsibility to improve the road as necessary to support haul traffic and the contractor must restore the roadway and any adjacent sod and sprinklers to their pre-project condition following project completion. A small 2 inch diameter pressure sewer line is also located several feet below this roadway that must be protected. As above, the restoration cost for this access point, if used, should be included in Line Item 17 on the bid form. The costs for any improvements and/or fill needed to construct/protect staging areas will not be paid for separately but should be included in the cost of mobilization. 10. Have seed mixes been specified for this project? Answer: No, seed mixes for upland and wetland restoration should be determined by the contractor through consultation with qualified landscaping companies or local experts. The seed mix must be approved by the City before use. 11. May the City s abandoned gravel pit be used to dispose of materials unsuitable for re-use? Answer: The City owns an exhausted gravel pit south of the project area at the location shown on the attached Figure 2. The gravel pit is accessed via Chipeta Drive. This area may be used to temporarily stockpile and dewater material excavated from the river; however, following dewatering, the contractor must remove these materials from the pit and dispose of them elsewhere. In other words, the City s gravel pit may be used for stockpiling and dewatering during the project, not for final disposal. The final disposal location will need to be arranged by

3 Page 3 the Contractor. The City s gravel pit is also available for project staging if desired by the Contractor. 12. May two access points into the river be constructed, one upstream and one downstream of the pedestrian bridge or must everything be shuttled under the pedestrian bridge via one access point? Answer: The contractor may construct individual access points into the river both upstream and downstream of the pedestrian bridge. These access points should be situated to minimize disturbance to wetlands and will need to be restored to their original geometry, armored where necessary, and vegetation/wetlands restored upon completion of the project. 13. May the river bank be cut back laterally in order to create more room to accommodate the river bypass? Answer: No, with the exception of designated slope layback and bank terracing areas, shaping activities may only take place below the ordinary high water mark of the river. 14. Is the contractor expected to dam and bypass pump all of the river s flow to create the dewatered work area? Answer: The concept for river bypass would be to create coffer dams that confine the river to its edge, letting it flow by gravity past the project area. 15. Can the flow out of Ridgway Reservoir be cut back for the duration of this project in order to reduce flows within the project area? Answer: No, I spoke with the operators of the Ridgway Reservoir dam and they stated that this would not be possible. They also indicated that winter base flows may be slightly elevated this winter when compared to the last several years, although an exact flow number was not available. 16. What conversion factor was used for converting cubic yards to tons for rock materials? Answer: A conversion factor of 1.8 tons per cubic yard was used to convert between volume and weight for boulders. This is the conversion factor for a stockpile of rock materials, not the rock itself, so it represents the overall unit weight of the stockpiled mass including air voids. Keep in mind that all aggregates will be paid for by the ton so this conversion factor will not be used during the project or when calculating quantities. All aggregates will be paid for based on weigh tickets. If aggregates do not come from a quarry, the contractor will need to establish a tare for their haul trucks (with the tank full of fuel, to be agreed upon with the City) and weigh all aggregates at a certified scale prior to delivery to the project site. 17. What size is the City s irrigation pipe with a diversion near the head of the project? May this pipe be used to bypass some of the river s flow? Answer: The irrigation diversion pipe immediately west of the vortex weir at the head of the project is 12 inches in diameter. This pipe is partially silted up and reverse graded in some places and is therefore not suitable for bypassing any of the river s flow during the project.

4 Page 4 Clarifications and Reminders Keep in mind that rocks placed in the river may need to be re-handled several times before getting situated in their final location. This will be directed by a representative from REP. Horizontal and vertical layout of project components will be performed by REP. In several instances, benchmarks and finish elevations will be provided by REP and it is the contractor s responsibility to perform incidental surveying to set project components based on these data. Fish habitat boulder clusters already existing within the project area and some of these may be re-used for construction of the new fish habitat boulder clusters. Other competent boulders present within the project area may also be incorporated into the project. If habitat boulder structures are constructed with re-used boulders, they will still be paid for out of Line Item 8 on the bid form as this line is for construction of the clusters and already excludes the rock. There will be zero tolerance for track out of mud from the project area or leakage of muddy water from project haul trucks. Any leaking trucks or track out must be addressed and cleaned up immediately. Plan Revisions Remove The contractor shall obtain a construction dewatering permit for all construction activities from the Colorado Department of Public Health and Environment from the City of Montrose General Note 8 on page 10 of the plan set. This will be covered under the alreadyreceived 401 permit for the project. Sheet XX on Line 16 of the bid form should read Sheets 4 and 6 Acknowledgement in Receipt of Addendum FIRM NAME: BY:(Printed) BY:(Signature) TITLE: Note: A signed acknowledgement in receipt of this addendum MUST be included with your bid proposal.

5 Page 5 Photo 1: Cerise Park Pedestrian Trail Access

6 Page 6 Figure 1: Potential Western Side Access Route

7 Page 7 Figure 2: Location of the City s Gravel Pit