2003 AGN FEB 04 I01 - Laserfiche WebLink

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Colton Utility Authority Meeting of January 21, 2003 Wellhead Treatment of Well Nos. 15, 17, and 24 Page 2 of 3 a full surface water treatment train downstream of the reactor before the water can be considered safe for human consumption. Because of the complexity, initial capital cost and space requirements, ex-situ biological treatment was not considered acceptable at this time for Colton's three impacted wells. Staff has reviewed proposals from three vendors who can provide wellhead treatment systems: Basin Water Technologies, U.S. Filter Corporation, and Calgon Carbon Corporation. The proposals submitted by U.S. Filter and Calgon Carbon both utilize a non-regenerable resin technology. The proposal submitted by Basin Water Technology utilizes a regenerable resin. A synopsis of the proposals is tabulated below: Basin Water Calgon U.S. Filter Capital Cost $2,553,750 $1,415,889 $605,250 CosUAcre Foot Treated- $350 $660 $435 (All three wells combined) Total First Year Annual Cost * $2,903,750 $2,075,889 $1,040,250 ' Based on 1000 AF per well. Due to the fact that the wells are located in or adjacent to residential neighborhoods, staff has concerns regarding the impact of the truck traffic that would occur every few days to replenish and dispose of the brine associated with the regenerable brine type of system. The single pass resin also eliminates concerns regarding the future availability and potential increased costs of brine disposal. Although the Basin Water Technology proposal has a lower per-acre-foot cost, it would take 22.9 years of operation at 1000 AF annually to break even with the proposal provided by U.S. Filter due to the significantly higher initial capital cost. Until additional funding is obtained to support the ongoing costs of plume cleanup, the operation of these wells and their associated treatment system would be limited to meeting peak system demand during the summer months. Utilized in this manner, the impact to the current city water rate structure would be insignificant. In addition to the treatment system installation, some minor work will be necessary on each of the weils to provide adequate pressure to the treatment system. ALTERNATIVES Continue to purchase water from the City of San Bernardino at a cost of $3000-$6000 per day during the summer months to meet system demand. Construct additional pipeline and pumping stations to improve conveyance capacity from the northeast part of the city to the Western Pressure Zone. Initiate mandatory water rationing or serve water that exceeds the action level for perchlorate and notify the public. FINANCIAL IMPACT