1999 AGN MAR 02 I11 - Laserfiche WebLink

Browse Search

Tuesday, February 23, 1999 9:36 AM To: Tom Clark From: TRW Page: 1 of 1 MEMORANDUM (GTS ASSOCIATES INC. MANAGEMENT - ENGINEERING - ARCHITECTURE - PLANNING 1685 COUNTRYCLUB DRIVE, REDLANDS, CA 92373 (909) 792-4893 FAX (909) 792-3852 3272 NO. -E° STREET, SUITE A, SAN BERNARDINO, CA 92405 (909) 824-3199 FAX (909) 792-3852 DATE: 2-23-99 FILE: 86000WTR.DOC TO: Tom Clark, Public Utilities Director City of Colton c/o Lorraine June FROM: Tim R. Wilson, P.E. A.I.A Colton City Engineer's Office SUBJECT. --Recommendation for selecting an Engineering firm for the Water Well project Based upon interviews conducted February 17,1999 1 have found that any of the firms responding to the RFP would be capable to doing a fine job for the City of Colton. There are three primary reasons for selecting Kennedy -Jenks for this project. 1. Kennedy -Jenks is the only firm who proposed a time frame completing the well design and construction work which met the City's aggressive time line. They proposed a completed well and pump facility which should reduce staff time and possibly consultant costs. I was impressed when they submitted a specification for the well drilling portion of the project at the interview. I am convinced that they can come close to meeting but not exceeding the City's schedule. I estimate more time is needed by the City and Contractor than granted in the schedule which completes the project 3 weeks early. I would be happy to be proved wrong here. 2. There were several design methodologies presented by the four firms. Kennedy- Jenk's design method calls for well drilling and testing prior to pump design completion. This method is the most conservative and ensures the well characteristics will be certain at the time of pump design. This assures an efficient pump design. This was the design method of Kreiger and Stewart, my second highest rated firm. In my opinion, delaysand change orders are more likely in alternative design methodologies presented by the remaining two firms which release a single bid to a contractor to drill and construct the pump. 3. Kennedy -Jenks also offered a design solution for the problem of dual zone service by the pumps. Each zone has a different pressure demand which reduces pump efficiency. A variable frequency drive was proposed by Kennedy -Jenks to solve this problem. Concerns were raised about the serviceability of such a system which may or may not be a problem to Colton. This option and it's cost is better resolved during the design phase of the project and does not exclude a conventional final pump design. I was pleased to see that Kennedy -Jenks was thinking creatively to solve this unusual problem. Although Kennedy -Jenks has done work for Colton in the past, they appear to be a less utilized firm by Colton. However, their presentation was well made and their abilities appear to exceed the problem at hand. The aggressive schedule will require significant up -front staff attention, however l expect the overall load on City staff to be less since the project will be significantly less time. If you have any other questions about my review of these firms, please let me know. CC: File 212 319 9