04-12-2006 Council Agenda - Laserfiche WebLink

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28/02/2006 11:24 541 -883 -1361 David Larson Page 2/2 LIOUnAs;ON TECHNOLOGY Our bids are based on a variety of factors that pertain to the length of time it takes to accomplish our work. The main consideration is the amount of sediment that has to be removed. This of course is mainty influenced by the floor area of the reservoir and the depth of the sediment. The following factors influence the length of time and our ability to accomplish the work. This quote is based and contingent upon the following: (C = Cleaning, CI = Cleaning or Inspection). 1. That all information provided us is correct, entry hatches are large enough for a diver to enter, and all reservoirs are accessible by four wheel drive pick -up truck pulling a 14'- 18'trailer. (CI) 2. During cleaning reservoir water levels must be kept at or near full capacity unless instructed prior to proceeding with work, (C) 3. Placement and disposal of effluent removed from the reservoir is done at the direction of the Customer. (C) 4. Quotes for cleaning assume that the sediment is normal material (such as silt, flocculated material, insects, light sand, manganese, rust, etc.) found in potable water reservoirs that is easily removed by our vacuum system. If the sediment is difficult to remove such as large amounts of concrete chips, gravel, rocks, detached coating debris, etc., then our hourly rate shall apply for each hour (over the first hour) for removing this material. (C) 5. Unless specified in quote detail we clean all submerged horizontal and angled berm or sloped surfaces. Vertical surfaces such as the walls can be cleaned but must be listed separately in the quote detail or estimated by the divers upon inspection. We do not clean surfaceathat are out of the water. (C) 6. If any information provided to us is incorrect or if any problems exist that inhibit our ability to complete the job on a timely schedule, then we will notify you of the problem and reserve the right to add on to the quote based on our estimate of the additional time it will take to complete the.work. Charges for time delays are listed on page 1. This paragraph only applies to any problems that are your responsibility. (CI) 7. Laboratory analysis of water, coating, or debris samples is your responsibility unless specified earlier. (CI) 8. If filtration or dechlorinaflon of discharged effluent is required there are additional charges for cost of materials. The additional cost is listed in line #3 of your quote. All inspections are done according to ASNT / NACE standards. All of our commercial divers and ROV operators are trained in nondestructive.testing and inspection procedures. All disinfection, cleaning and training procedures are in accordance with AWWA standards. Inspection reports include a high resolution color video tape /CD with real time imprint and a time log indicating where each feature or problem area maybe found. The video tape /CD is narrated live by the divers and your personnel (in the control trailer). One copy of a computer generated, printed report is also provided with still color images of the fixtures and problem areas along with a schematic diagram of each tank. Our inspection procedure includes the following checklist: • Security - , • Exterior Ladder • Floor and Wall Seams • Scour / Drain • Man Entry . • Installed Sensors • Interior Floor and Walls Coating • Water Taps • Entry Hatch • Chlorine Injection • Cathodic Protection • Exterior Reservoir • Overflow:: - • Sediment Depth • All (inlet) / Discharge (outlet) • Manual Level Indicator • Ceiling • Interior Ladder • Support Columns • Exterior Vents & Screens For the total time we are - inside the tank the job is on video and can be viewed by your personnel. We record any portions of the job that you request, or in your absence, we record the areas of interest listed above with particular attention to areas in need of further maintenance. We are prepared:to give you an estimate for and accomplish repairs at the time of inspection. Our cleaning procedure is accomplished utilizing our proprietary vacuum cleaner, the "LiquiVacTM" (Patented). The LiquiVacTM pumps an average of 200 -240 gallons per minute. It has a rotating soft bristle brush that scrubs the floor clean and removes all sediment without creating turbidity in your reservoir. This is the only way to ensure that all biofilm is removed from the interior surfaces without getting any of it mixed into the water column. This system also enables us to clean walls. For coating repair in steel tanks we use a two part underwater epoxy. Each rust nodule or area of coating defect is wire brushed to bare metal and epoxy is applied over the area. The epoxy chemically bonds to the steel, displaces water, and remains intact with a greater bond than the original coaling. All of our repair, sealing and coating materials meet or exceed NSF 60 & 61 standards. For leaks or cracks in concrete reservoirs we utilize a dye injection leak detection and epoxy repair procedure. The first stage of repair is to perform a:leak detection using a FDA approved dye which is injected around suspected cracks or seams. When the leaks are located they are repaired with the appropriate material. -13-