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Item No: 71 Meeting Date: October 26, 2009 M0UNDtSVVfE_W Type of Business: Council Business Administrator Review: City of Mounds View Staff Report To: Honorable Mayor and City Council From: Nick DeBar, PW Director/ Mike Schnur, Lead Utility Operator Item Title/Subject: Resolution 7518 Authorizing Replacement Purchase of Chemical Scales and Chemical Switch-Over Units Introduction: Water Treatment Plant No. 1 (WTP#1) was constructed in 1992 and has the original chemical tank switch-over units still in use. The chemicals used to treat the raw ground water to drinking water standards rely are fed through these units as part of the treatment process. Currently, the switch-over units do not switch-over automatically to a secondary tank. When the tank becomes empty, the switch over is done manually by hand. This can lead to either not feeding chemicals into the water for a short period of time that it goes unnoticed (at nights or weekends), or switching over the tank before it's completely empty. WTP#1 had a Sulpher Dioxide scale replaced in 1998 and that scale is showing signs of failure. In addition, the chemical scales at WTP No. 2 and 3 are also failing. The digital display won't display from time to time, and although it has always come back, eventually it won't. These scales are how we verify our chemical feed dose in the water in accordance with Minnesota Department of Health Standards. Discussion: Public Works has received verbal quotes to replace the three scales and two switch over units. The following are the three quotes received: 1. Larsco: $5,985 ($1,575 each for the scales, and $630 each for the switch-over units) 2. Vesco: $7,110 ($2,370 each for the scales, and no quote given for the switch-over units) 3. Hawkins: $6,600 ($2,200 each for the scales, and no quote given for the switch-over units) No quotes were obtained for the switch-over units from Vesco or Hawkins since they would not provide them as part of the scale price. However, the quote from Larsco with the unit prices for switch-over units was still less than Vesco and Hawkins. This equipment replacement was not expected. This was not included in the adopted 2009 budget. However, monies are available in the designated account for this type of purchase. Account 700-4823- 7030, Water Infrastructure & Equipment Maintenance-Capital Equipment has $10,000 budgeted for the water tower assessment. There is also $5,000 for the water tower evaluation in this fund under 700- 4823-3030 - other professional services that the contracted study is being paid from. Therefore, staff recommends funding the purchase of the chemical scales and switch-over units from account 700-4823- 7030. Recommendation: Staff recommends adopting Resolution 7518, which would authorize the purchase of three chemical scales and two chemical switch over units from Larsco Inc. for the total price of $5,985 plus tax and shipping. Respectfully submitted, Nick DeBar- Public Works Director