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2.u ENVIItONMENTAL C~IECKLIST DISCUSSION a,b) Pipeline would be installed within roadway right-of-ways using standard open-cut trenching techniques by means of speed shoring or trench box bracing. Bore and jack methods would be used under creeks. Table 1-2 summarizes the anticipated construction methods for each pipeline segment. Traffic-generating construction activities related to pipeline installation would consist of the daily arrival and departure of construction workers to the work site; trucks hauling equipment and materials to the work site; and the hauling of excavated spoils from, and import of new fill to, each work site. An estimated 10 workers would be used for the pipeline construction crew. Construction equipment used for pipeline construction would include backhoes, front-end loaders, dump trucks, flatbed delivery trucks, cranes, compactors, concrete trucks, and paving equipment. Based on the estimated crew size, and assuming some overlap in construction activities at the work site, construction worker trips traveling to and from the work site are not anticipated to exceed 15 round trips (30 one-way trips) per day. As discussed in Section 1.0, the trench size for open-cut installation within paved roadways would be approximately four feet wide and six feet deep. The active work areas of about eight feet on one side of the trench and 10 to 12 feet on the other side for access by tracks and loaders. This would result in a construction easement of approximately 30 feet in width. It is expected that open trench construction within paved roadways would proceed at the rate of approximately 200 feet per day, with an overall work zone of 300 to 600 feet. Using the above trench size and construction rate estimates, and assuming full backfilling of soil, it is estimated that up to 178 cubic yards (cy) of trench spoils would be hauled offsite daily, and 165 cy of new fill would be imported daily. Using an average haul load of 10 cy per truck, this would amount to up to 18 truck haul round trips (38 one-way trips) generated per work day. Accounting for the delivery of pipes and other construction components (which would be shipped on demand to the Project site throughout the construction period), the total number of off-site construction truck trips would be approximately 34 round trips (68 one-way trips) per work day. The pipeline alignments would follow within and/or across several roadways. The exact placement of the pipeline in the roadways is not known at this time, but regardless of where it would be installed, pipeline installation activities would temporarily disrupt existing transportation, and circulation patterns in the vicinity. Impacts would include direct disruption of traffic flows and street operations. Lane blockages during pipe installation would result in a reduction in travel lanes, on-street and off-street parking. No constntction is pzoposed within and/or across high traffic volume arterials. Traffic analysis of the pipeline alignments found that the Project would not significantly affect roadway segments and intersections at all locations if the construction zone were to reduce the travel width during peak traffic periods. The impacts during peak traffic periods would not be significant because they would result in either roadway or intersection levels of service (LOS) that would not be unacceptable (i. e., worse than LOS D). The decrease in traffic volumes outside the peak periods typically, but not universally, is sufficient to allow the reduced number of travel lanes to accommodate the traffic flow without significant delays. Delays also would be experienced by drivers during off-peak hours, but because of the lower volume, fewer people would be affected by the delays during those periods. San Leandro Recyclcd W ater Projcct 2.-44 ESA /?A3193 Draft iS/MND