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City of Santa Ana w to Select pipeline material, At pipes less than 24-inches in diameter, PVC and ductile iron pipe " p pPo,fi �fMUM!>'Gat Y '�IVM Ib' .are the two most economical choices. VA Select an alignment to minimize impacts to traffic. H Identify any critical crossings that result in significant risk during construction and recommend "potholing", physically locating the utility vertically and horizontally in the field. Identify locations for appurtenances and their impacts. An example is an air and vacuum valve location relative to existing parking or blow -off located near a storm drain or sewer. Identify Schools, Emergency Facilities and Public/Community Centers. There is an existing church adjacent to the project site and another along Bristol Street near the Santiago Creek Crossing. Santiago Elementary School is located south of the John Garthe Reservoir site. Develop Plan to Minimize impacts Maintain Access to Commercial/Businesses/ Residences - Limit length of Work Zone Maintain Public Use of the Park 9 Evaluate three options: - Bore and Jack the creek crossing: this has minimal impacts to the creek or bridge but results in 4 to 6 weeks of 24- hour traffic control. - Utilize the pier walls: We have done this several times for other agencies, the installation tends to be quicker than boring and jacking but the permitting for work within the creek and modifications to the existing structure tend to increase project schedule and can be difficult to obtain. IEGFNO ivrv'.+m4 awwV � ca�ww.xa..reunrcv ,m rM+wtwaautwn,w+n iOtYN11a4PtlWipiH1 EXISTING SANTIAGO CREEK BRIDGE 6oreand lack i 6-Inch Water Line 30-Inch Steel Casing Utility bay option - Utilize Abandoned tII-inch Water Line Pier WaltOption -Above Ground installation SANTIAGO CREEK BRIDGE CROSSING Utilize the alignment of an abandoned pipeline through the bridge deck: Based on our review, there is an abandoned 18-inch pipeline that was installed in the original bridge deck. The ability to utilize this alignment depends on the accessibility of the bridge cell and modifications at either bridge abutment.