Item 18 - Traffic Signal Installation at Segerstrom Avenue and Rosewood Avenue

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CITY OF SANTA ANA SPECIFICATIONS PROJECT NO.: 25-6030 TRAFFIC SIGNAL INSTALLATION AT SEGERSTROM AVENUE AND ROSEWOOD AVENUE Pipe bedding and trench backfill shall be accomplished in accordance with the City of Santa Ana Standard Plan No. 1150, these Special Provisions, and the trench details on the construction drawings. For VCP sewers, the pipe zone and bedding material shall be 3/4- inch crushed rock. For VCP sewers in high groundwater conditions, the pipe zone and bedding material shall be 1/2" crushed rock wrapped in geofabric (Mirafi 140N or approved equal). For PVC pipe and ductile iron pipe sewers, the pipe zone and bedding material shall be imported SE-30 sand. The trench zone backfill shall be Class II aggregate base. All material tickets (i.e. Sand, Class II Base, Crushed Rock, Asphalt, Concrete, etc.) shall be given to the City Inspector on a daily basis. No backfill shall be placed until the sewer pipe laid has been approved by the City Inspector. Crushed rock products shall be in accordance with subsection 200-1.2 and Table 200- 1.2(A) of the Standard Specifications. The seventh and eighth paragraphs of Subsection 306-1.3.1 of the Standard Specifications are hereby deleted and replaced with the following: Rocks greater than 4 inches in any dimension will not be permitted in backfill placed between 1-foot above the top of any pipe and 1-foot below pavement subgrade. Backfill around sewer manhole and structures shall be sand placed a minimum of 2' laterally around structure and backfilled to subgrade. The following test methods shall be used for determining relative compaction: California Test 216 (Sand Cone Method) California Test 231 (Nuclear Gauge Method) The Contractor will be provided with compaction test at locations deemed necessary by the Engineer. If compaction fails to meet the Contract Specifications, then the Contractor shall make the necessary adjustments and is responsible for the cost of additional compaction tests until compaction per the specifications is met. All trench and structure backfill sand, crushed rock and Class II aggregate base and native material shall be compacted to 95% of maximum density at optimum moisture. If any trench, through the neglect of the Contractor, is excavated below the grade required by the plans and these Special Provisions, it shall be refilled to grade with additional bedding.