Laserfiche WebLink
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 (W'Materlal TBO) with arterial street <br />PRELIMINARY ANALYSIS: <br />L Sewer Material. Many factors should be considered when determining the best material for sewer construction. These include. <br />D Corrosion Weight <br />C) <br />P Abrasion Imperviousness <br />* Strength Cost <br />x Durability Hydratific Efficiency <br />0 <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 pe0orm$ well in typical urban loading <br />C) <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 />Z The City has determined that tire 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 mentions that the water well Is a sand producers but does not Indicate if the sand <br />production has Increased, It is our assumption that the 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 "Sandstane.' The most prevalent water well problems for this <br />typo of aquifer would be: <br />- FISSURE PLUGGING - CASING 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 well was constructed with corrosion In mind. This leaves plugging as the likely cause for <br />loss of production! We anticipate that I udher evaluation will lead to the following rehabilitation methods: <br />A. Aqua Freed CO2 Injection; Effective at removing mineral Incrustation, biological fouliMadphyski�inrg. <br />geological penetration, It is 100% green, and environmentally sound with no adverse chemical waste stream. <br />Provides extensive--- <br />B.Chomical andAcid Cleaning: Used in Conjunction with pumplagand surging it is effective at dissolving mineralsond 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 0: 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. Exclusions <br />)) Traffic signals and median design <br />)> Traffic Report <br />)� Right -of -Way Services <br />2. Assumptions <br />Water, sewer, and dry utilities will be protected in place Manholes and valves will be adjusted to grade <br />Storm drain will require retrofit to new curb and gutter alignment Street lights and illumination design required <br />Most meet water quality requirements Sound wall required <br />HUITT-03ILLARS <br />City of Santa Ana Civil Eflgineering Services: RFP 17-083 6 <br />,J <br />25E-276 <br />