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HomeMy WebLinkAboutAGENDA REPORT 1993 0721 CC REG ITEM 11C •. ITEM 1I . G,. AGENDA REPORT )ORPARK, CALIFO^A' C=TY OF MOORPARK City Council Meeting of 199 3 TO: The Honorable City Council A - i• re FROM: Kenneth C. Gilbert, Director of Public Works ;� A� By06,4,7 DATE: July 14, 1993 (Council Meeting 7-21-93) pd1. SUBJECT: Consider Approval of Phase I Water Well Rehabilitation Program for Arroyo Vista Community Park. BACKGROUND As you may recall, the parksite conveyed to the City by Urban West Communities (UWC) came with two water wells. These wells were used to provide irrigation water for the prior agricultural use of the property. The City required the landscape architect to design an irrigation system for the park which utilized these water wells as the source of the irrigation water for the park. The water supply for the buildings will be provided by a domestic water service. DISCUSSION A. Cost Savings Irrigating the park with water from City-owned water wells is much more cost effective than using a domestic water supply. A comparison of the estimated cost for these two water sources is summarized as follows: Domestic Water City Water Description Service Costs ($) Well Costs ($) Calleguas Municipal Water 70,000 0 District Connection Fees Water Works District #1 19,000 0 Capital Connection fees Water meter installation 1,500 0 charges Water usage per year 30,000 1,000 Phase I (33 acres) Water usage per year 60,000 1,500 Total Park (69 acres) Water well maintenacne 0 1,000 and operation (electrical energy, oil, etc. ) Arroyo Vista Community Park Water Wells Page 2 B. Existing Wells The existing water wells were constructed twenty (20) to thirty (30) years ago. The condition of these water wells is in doubt. At a minimum, the age of the wells, the pump motors and related equipment gives rise to concerns regarding the long term reliability of this water source. In addition, the performance capability of the two wells is different. One well has a thirty (30) HP motor. The other has a fifty (50) HP motor. Presently we are only using the well with the fifty (50) HP motor. This well is able to provide the water pressure and flow rate required to operate the park irrigation system. The other well does not produce a flow rate and pressure which can be used to irrigate the park at the same rate. To switch to the back-up well requires the re-programming of the irrigation controller. C. Preliminary Investigation Staff has retained the services of Coast Pump to conduct a preliminary investigation of the wells, perform certain minor maintenance and to give staff some training on the maintenance and operation of the wells. In addition, staff used Coast Pump as a resource in developing the various tasks and approaches to be considered when rehabilitating a water well. D. Proposed Rehabilitation Program It is recommended that the City embark on a phased program to rehabilitate the water wells and replace the well pumps at Arroyo Vista Community Park. The recommended approach to be taken in this effort is outlined as follows: Phase 1: Rehabilitation of the thirty (30) HP pump and well. As discussed above, this well is presently not being used due to the incompatibility of its operational characteristics with those of the primary well. A. Investigation and Recommendation: Retain Coast Pump to perform the following tasks: ■ Pull the well column pipe and inspect same. ■ Perform a television inspection of the well casing. ■ Provide a general description of the condition of the well, including the depth of the well and the depth of the water level in the well; ■ Provide a general description of the condition of the well pump components. ■ Develop a profile of the required pumping characteristics (pressure, flow rate, drawdown, etc. ) Arroyo Vista Community Park Water Wells Page 3 ■ Develop and provide recommendations regarding the following: • the conditions of the well casing and the method to be used, if any, to clean same (chemical, blasting, brushing, etc. ) ; • the method to be used to remove the debris from the well produced by cleaning or other sources; • the type of well motor replacement; and, • specifications for all of the above. B. Improvement: Based on the findings and recommendations developed in Phase 1A, proceed with the following: ■ Develop plans and specifications for a contract for the upgrading of the well. ■ Obtain City Council approval of said plans and specifications, as well as authorization to advertise for bids. ■ Advertise and award a contract for this work. Phase 2: Rehabilitation of the fifty (50) HP pump and well. Perform all of the above tasks on the second water well after the first well is rehabilitated. This phase could be deferred to a later date if necessary for funding reasons. E. Fiscal Impact The cost to have the preliminary investigation and analysis performed (Phase 1A) is approximately $2,500. The cost upgrade the well (Phase 1B) cannot be determined until after Phase 1A is completed and the well improvement plans and specifications are prepared. It is anticipated that the well improvement costs will be $25,000 to $50,000 per well, depending on the level of effort required and the type of well pump to be installed. Again, these details will be discussed in more detail after the design is completed and presented to the City Council for approval. It is recommended that the required expenditure for Phase 1A be authorized under the park construction cost contingency previously approved by the City Council. A more complete fiscal analysis of this element of the required park improvements will be presented to the City Council at the time the Phase 1B plans are presented for approval. F. Committee Review Staff has discussed this matter with the Public Works, Facilities and Solid Waste Committee (Mayor Pro Tem Montgomery and Councilmember Wozniak) . The Committee members stated their support of proceeding with this program. Arroyo Vista Community Park Water Wells Page 4 RECOMMENDATION The Public Works, Facilities and Solid Waste Committee and staff recommend that the City Council authorize staff to proceed with the Phase 1A water well investigation as generally described in this report. wp\rpt\avpwelll