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Par. 86 4256 86. EXCAVATION FOR ?OUTH SHORE MARINA The item 0' tne sched~le for excavation, aU ctas.ses, "for south shore rnarif"!a includes all e~ca~atj_on and gradjngs required for constru1..1ion ot the south shore marina as shown on Drawing No. 45 (382.0-1431). The finishsp excal/ation shall be graded smooth to the appropriate grqdes shown on the drawings. Measurement, for p3yment, of excavation, all classes, for south shore marina will be made 85 provided in Subparagr~ph .B1d. Payment for excavation, all classes, for south shore marina will be made at the unit price per cubic yard bid therefor in the schedule, which unit price shall include all costs of grading and all costs as provided in Subparagraph 8ld. 87. EXCAVATION, COMMON, FOR CONCRETE DAM AND STILLING BASIN The item of the schedule for excavation, common, for concrete dqrrI and stilling ba$in includss all exr:avation required for r~moval of common material in the access roadway across the top of the existing concrete plug t and adjacent Buttresses 15 and 17, the roadway ramp in the downstream end of Buttr8Si 1, and the roadway ramp into the spillway Dutlst channel where the training wall is to be cpnstructed. 88. EXCAVATION, ROCK, FOR CONCRETE DIl-.M The item pf the schedule for excavation, rock, for con~rete dam includes all rock excavation required to deepen or enlarge buttress excavations to obtain the desired sound rock foundation for the dam and the additIonal excavation in Buttress 7 to acco~modate the south outlet pipes and downstream gate chamber, and will include the removal of loose rock 1 cubic yard or larger in size from existing excavated surfaces for t the concrete dam. Additional required buttress ex.cavations are shown on Drawings No. 36 (382-D.1338) and 36A 1382.0-1342). Prior to any blasting for rock excavation the contractor shall submit h\So plan for bla~~ing' roc'K excavation to the contracting officer tor appro.val. All blasting operations, drilling and b./as.ting patterns. depth and size of holes, and weight of charge per delay shaH be subject to approval by the contracting officer. The explosive shall be of such quantity and moderate SPECIFICATIONS NO. DC-6945 (SUPPLEMENTAL NOTICE NO. 31 power and shall be used in such locations as will not open seams or cracks. or cause damage to the rock outside of the prescribed limits of excavation. As the excavation approaches the final excavation lines. and except for the last 5 feet of rocl< to be excavated, the depths of blast holes shall not exceed two-thirds of the depth of the rock remaining above the final grade and the amount of explmive used in each hole shaH be reduced progressively. Whenever, in the opinion of the contracting officer. further bl-.sting might damage the rock. the use of explosive iihall be discontinued, and the excavation shall be completed by wedging, barring, channeling, line drilling and broaching, or other suitable methods. When the excavation has been completed to the final line$ shown on the drawings or established by the contracting officer, the surface shall be cleaned oft with an air and water jet under high pressure for purposes of inspection. t . The contractor shall place a concrete protective coating on the exposed shale surfaces in Buttres5i 10 upon or against which concrete will be plaaid. The contractor shall not perform excavation within the final 1 foot of finished surfaces in areas which will require protectiye coating5i until ~ll equipmwT)t and facilitie.s r~quired for immediate application of pr.otectiv,e coatings are available and in worKing t condition. The final 1 foot of e)(cavation in areas requiring protection shall be completed within 8 hours and protective .co.ating shall be qpplied to those areas so that finished excavated surfaces will be exposed for the shortest possible period of time which shall not exceed one-half hour. Exposed finished excavated shale surfaces shall be kept moist at all times to prevent evaporation of the natural moisture in the material and shall be protected from freezing. . Surfaces to be coared shall be cleaned of all loose material, dirt, dust, mud. standing water, and other foreign matter. Coatings of protective materials shall not be applied when air temperature is below 350 F, nor during rainy or other adverse weather as determined by the contracting officer. Concrete protective coating shall be applied so that the contact surface is covered to a depth of not less than 2 inches. The concrete shall conform to the applicable pfOlJi~jons specified in Paragraphs 129 to 150, inclusive. The exposed surfaces of concrete protective coating shall be considered as a construction joint and as such shall receive the same treatment required by the provIsions of Paragraph 170, prior to placement ot structural concrete on the concrete protective coating. , .' ., , , 1 . 58