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Project 144 - Proposal - Hamers - 1997-02-28 ROBIN B HAMERS 234 E 17TH ST SUITE 206 6. ASSOCIATES INC COSTA MESA, CA 92627 CIVIL ENGINEERS • PLANNERS • SURVEYORS (714) 546-1192 February 28 1997 FAX (714) 946-6x16 Board of Directors Costa Mesa Sanitary District P 0 Box 1200 Costa Mesa, CA 92628 RE PROPOSAL TO PROVIDE INSPECTION SERVICES PROJECT 1112100-144 MANHOLE REHABILITATION Dear Board of Directors The following proposal is submitted to provide the necessary engineering services during the construction phase of said project Construction is scheduled to be completed within a 12 week period beginning in April 1997 The necessary services to oversee the project are engineering, drafting and inspection and the estimated maximum number of hours and proposed rate for each are as follows Engineering 32 hrs @ $ 63 00/hr = $ 2 016 00 Draftsman 8 hrs @ 47 00/hr = 376 00 Inspection 160 hrs @ 42 00/hr = 6 720 00 TOTAL $ 9 112 00 Attached are copies of the project report as described in the 1995-96 Capital Improvement Program as well as the Boyle Engineering independent report The above are maximums and billing will be only for actual time worked Sincerely OW4( Robin B Harriers RBH/jp/proposal cms ® Pr nted Recycled Pape ct9 — °((e C Ani l-Ai_ :CH p,zo vet.'i� eta eAti Project 1112100-144 Manhole Rehabilitation The project will rehabilitate various manholes with various problems throughout the District as described below Adjacent to each pumping station is a sewer manhole where the last leg of the gravity system exists prior to entering the pumping station This manhole usually has two or more sewer lines flowing into it and serves as a confluence manhole for all flows entering the station Due to the turbulence associated with the confluence causing high strength gas concentration, plus gas coming from the pumping station wet well into the manhole erosion of the manhole walls and bottom occurs It is proposed to coat the manhole interior with industry standard polyurethane coating which will prevent erosion Prior to receiving the coating the walls will be built back to full thickness and waterproofed Other manholes in the District require various other rehabilitation methods such as replacing corroded metal steps with plastic steps, replacing ring and covers worn from traffic, adjusting manhole covers to the appropriate elevation rechanneling manhole bottoms , and replacing aluminum access covers to pumping station wet wells Also one pumping station requires a repair coating on the existing polyurethane coating on the walls An estimate of the project costs is as follows Design $ 9, 500 Construction 65 000 Inspection 9 500 Reserve or Contingency 16 000 TOTAL $100 000 - 3 - Bowie Engineering Corporation consultlnq engineers arcn,tects 7501 Qu it Street 714 476-3300 PO. Box 3030 FAX 714/721 7142 Net 'oert Beach, CA 92658-9020 Telex 685561 - •dr"f:YY^j::A<' "v-^...air -I. . ..:..:.ti:... [.,.,_I�.i.n.W.n.S.:h:,W-' .:ti...Y.<..'. ... _+I,t i.v...F-iila_Y =a.. TRRflSPORTRTIOf SERVICES Mr Robin Hamers. District Manager/Engineer August 29 1995 COSTA MESA SANITARY DISTRICT Post Office Box 1200 Costa Mesa. CA 92628-1200 1995-96 Capital Improvement Program (CIP) Review I have completed my review of the Costa Mesa Sanitary District (District) s CIP report for the 1995-96 fiscal year The review consisted of reading the project descriptions. telephone conversations with District staff(Robin Hamers) and an independent analysis of construction costs. design and construction engineering costs, and contingency costs. The following represents nn analysis of each of the CIP projects. This is the fourth independent review of the District s CIP program, 1992 93 being the first year reviewed. The 1995-96 proposed improvement projects appear warranted and the report continues to properh reflect the on-going capital improvement program. Project 1112100-144 Manhole Rehabilitation This is the first on what appears to be an on-going rehab of manholes. Existing manholes are experiencing deterioration due to gas and flow turbulence. Project will rebuild walls to bring them back to standard thickness prior to coating with polyurethane. For budget purposes the estimated design/construction cost and contingency cost appear reasonable. It is suggested that future and similar projects include a location/vicinit\ map and/or estimated cost per location.