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More specifically for this proposal the City is seeking submittal of qualifications for two options, Design and Construction support services for. <br />OPTION A; WATER RESOURCES <br />Rehabilitation of a 30 year old water well <br />1500 LF of domestic water design (12" PVC) <br />600 LF of sewer design (15" Material TOO) with arterial street <br />PRELIMINARY ANALYSIS: <br />1. Sewer Motorist. Many factors should be considered when determining the best material for sewer construction. Theseinclude: <br />• Corrosion Weight <br />• Abrasion Imperviousness <br />strength cost <br />Durability Hydraulic Efficiency <br />Of the many materials available each offers a set of unique advantages and disadvantages. For a 15" pipe, the material most <br />commonly used in local cities under an arterial roadway would be vitrified clay pipe (VCP), It performs well In typical urban loading <br />conditions and maintenance departments are well prepared to work with it, Our experience would have us assume VCP will be high on <br />the list of options. <br />2, The City has determined that the existing water well performance dropped by 35%. This percent is above the 25% rule of thumb that <br />would indicate It's time for rehabilitation. The RFP mention that the water well is a sand producers but does not Indicate if the send <br />production has increased. It is our assumption thatthe City has concluded that the sand production rate Is within an acceptable range <br />and that the Information is meant to determine that the aquifer type is "Sandstone," The most prevalent water well problemsforthis <br />type of aquifer would be: <br />- FISSURE PLUGOING - CASINO FAILURE - SAND PRODUCTION - CORROSION <br />The anticipated maintenance frequency for a sandstone aquifer would average 8 years. If the well has dropped 35% over 15 years this <br />is within the anticipated limits and sand production has not increased, casing failure is unlikely. It Is also our assumption that surface <br />equipment has been evaluated and that the wall was constructed with corrosion In mind. This leaves plugging as the likely cause for <br />loss of production! We anticipate that further evaluation will,lead to the following rehabilitation methods: <br />A. Aqua Freed UO2 Injection: Effective at removing mineral incrustation, biological fouling, and physical plugging. Provides extensive <br />geological penetration, it is 100% green, and environmentally sound with no adverse chemical waste stream. <br />-B. Chemical andAcIdClealng. Used in ConlunctIDOWIth pUmpiW6nd Surgingitis effeCtivestdissOlving minerals and imPacting-biological <br />activity and physical plugging of sands. The chemical solution is tailored specifically for the plugging problem, It offers limited geological <br />formation penetration and produces a waste stream of spent chemicals that must be neutralized and disposed of properly. <br />OPTION B: GENERAL ENGINEERING (OTHER THAN WATER RESOURCES) <br />• Conceptual street widening and rehabilitation Including parkway improvements <br />• New bike lane <br />• Intersections are complete <br />PRELIMINARY ANALYSIS: <br />1. rXclusions <br />Traffic signals and medlon design <br />Traffic Report <br />o Right -of -Way Services <br />2. Assumptions <br />Water, sewer, and dry utilities will be protected in place D Manholes and valves will be adjusted to grade t <br />>) Storm drain Will require retrofit to now curb and gutter alignment D Street lights and illumination design required <br />Must meet water quality requirements Sound wall required (J <br />HUITT-ZOLLARS City of Santa Ana Civil Eflginoerijig Spivices: RFP 17-083 6 <br />25E-230 <br />