2000-04-05_GENERAL DOCUMENTS - C1981037

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Ranney,Walker to McArdle,Nelson April 5, 2000 Page 2 of 2 Thickness of Gravel Wearing Surface. A question was asked about the 4.0" crushed rock note on Drawing 43 and the written specification (Wearing Surface,page 7) of 6". The wearing surface is to be a minimum of 6"thick. Width of Roadway. A question was asked about the width of the roadway. Suggested Response: In general, the width of the roadway is 12 feet. The entire width is to receive a gravel wearing surface. Between stations 1+60 and 3+20 (see Drawing 4), the width of the roadway is 14 feet, still a 12-foot wide gravel wearing surface. Related to this requirement, the exact location of the begin and end of the two 150-foot guard rails will be determined in the field with the project manager(or representative), but within the 14-foot-wide section of the road. Cleaning of Riprap. A question was asked if the riprap needed to washed (cleaned of grout). Suggested Response: No. Although care is requested to keep exposed riprap clean as practical, cleaning of riprap of grout spill, cover or splatter is not required. Alternate Borrow Areas: not addressed in this memorandum. The decision was made not to use the existing roadway as a source of borrow. As a fall-back position, the existing specifications for the borrow area up the valley are adequate. Conversion of the Drainage Feature Repair. This item is to be converted to a time and materials item rather than a bid item. Slopes might be constructed at 2 horizontal to 1 vertical in-lieu-of 3 horizontal to 1 vertical. If there is enough money left, recommend a fabric liner and riprap (2- foot diameter) be placed to armor the off-slope drainage to a V-section of 4 feet deep. Another Time and Materials Item. Pushing of any boulders in the drainage below the culvert down to buttress the lower drop structure would be a good added item. Files: GEC support C:\WPDOCS\gecprebidconf.sup.doc