_GENERAL DOCUMENTS - C1981017 (249)

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two deep (60 inch total height) on the east side to protect the Old Refuse Pile. The backhoe and Jersey barriers were paid via a change order to the Spring Maintenance contract. Rock deposition predominantly occurred as Dutch Creek rose each day in response to the days melting at higher elevations. The Creek usually began to rise in mid-afternoon, and would peak between 10:00 pm and midnight, then recede. The Backhoe would operate during these hours to sweep the accumulated rock through the culvert. Even with the backhoe operating, the creek would rise to the base of the Jersey barriers. On June 17, the area received a substantial amount of rain throughout the day. Pitkin County contacted the Division early that morning, voicing concerns of flooding along Coal Creek. A site visit during the afternoon showed that Coal and Dutch Creeks were higher than had previously been observed. At about 6:00 pm, it was observed that the facilities area drainage system had malfunctioned, and that the area was experiencing flooding. The water within the facilities area eventually reached the top of the containment berm, and overflowed in places. A second backhoe and operator were mobilized to the site at about 8:00 pm to help clear a blockage in a sump culvert which drains the facilities area. The sump blockage was cleared at approximately 1:00 am on June 18. Dutch Creek had crested an hour or two earlier without over flowing the Jersey barriers, due largely to continued sweeping of the rock through the culvert by the backhoe. Subsequent to June 17, Dutch and Coal Creeks slowly subsided, although a second peak in the flow was observed during the week of July 10. The Mine 3 pre-bid meeting was held on June 19. The road had to be cleared of snow in order for contractors to access the site. Even so, the mine entry bench had about 3 to 5 feet of snow cover at the time of the pre-bid. As a result, photographs of the site were included as part of a bid amendment. It is felt that the snow cover lead to an increased cost of the 3 Mine project, as the contractors were not able to get a good feel for the amount of dirt to be moved and the amount of demolition which needed to be accomplished. However, two of the three lowest bidders reported that they did return to the site following some degree of snow melt in order to further evaluate the project. The Mine 4 pre-bid was also scheduled for June 19, but was delayed until June 28 due to snow accumulations at that site. Again the road to 4 Mine had to be plowed open for contractor access to the site. Again, contractors were given photos of the project due to snow cover at the mine at the time of the pre-bid. It is felt that snow pack at this project site had a less significant impact on the project cost because the job was more straight forward, and the job locations were closer to each other. The low bidder reported that they also revisited the site after the pre-bid to better measure the scope of the project. 6