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CC 2015-07-28_08g Purchase of Tank Mixers pRROyO INCORPORATED 9Z V T * JULY 10, 1811 MEMORANDUM 4"tIFOVIL ' TO: CITY COUNCIL FROM: GEOFF ENGLISH, DIRECTOR OF PUBLIC WORKS,:::,,,e25 BY: SHANE TAYLOR, PUBLIC WORKS SUPERVISOR — UTILITIES SUBJECT: CONSIDERATION TO APPROVE THE PURCHASE OF TANK MIXERS DATE: JULY 28, 2015 RECOMMENDATION: It is recommended the City Council approve the purchase of four (4) tank mixers for Reservoirs 1, 2, 4, & 5 in the amount of$34,484.80. IMPACT ON FINANCIAL AND PERSONNEL RESOURCES: The funding for the mixers is included in the Water Fund Account # 640-5969-7001. The work to install the mixers is part of the nitrification reduction in-house capital improvement project, which is budgeted at $100,000. BACKGROUND: For many years the City's water supply reservoirs during early summer to fall experience nitrification problems. Nitrification is a microbial process in which ammonia is sequentially oxidized to nitrite. This leads to loss of chlorine residual. This results in immediate "shock" chlorination by City staff to eliminate the problem. There is a constant battle during the warmer months to keep our tanks from nitrification as it is temperature dependent. Once the water temperature drops below 70° F the activity stops. To correct this problem an evaluation/trial study was conducted in the summer/fall of 2013. The result of the study was that tank mixing, along with supplemental disinfection would help inactivate the nitrifying bacteria. ANALYSIS OF ISSUES: In order to understand the performance of the tank mixers, the two top manufacturers were contacted and free demonstrations were set up. The PAX water mixer and Solar Bee mixer both were evaluated for three months. During the duration of both trials, temperature data was recorded at multiple levels within the tank. Both mixers performed well with equal results. The Solar Bee mixer however is $25,000 less expensive per unit. Hopkins Technical Products is the only factory authorized, stocking distributor for the Medora Corporation GS Series Potable Tank Mixes in the State of Item 8.g. - Page 1 CITY COUNCIL CONSIDERATION TO APPROVE THE PURCHASE OF TANK MIXERS JULY 28, 2015 PAGE 2 California. Per the City's Purchasing Policies and Procedures Manual this purchase is allowed as a sole source procurement (see attachement#2). ALTERNATIVES: The following alternatives are provided for Council consideration: - Approve a purchase order in the amount of$34,484.80; - Do not approve the purchase order; - Modify as appropriate and and approve staff's recommendation; or - Provide direction to staff. ADVANTAGES: Purchase and installation of the mixers will allow the nitrification reduction capital improvement project to proceed and control the nitrification problem in the water tanks. DISADVANTAGES: No disadvantages noted at this time. ENVIRONMENTAL REVIEW: No environmental review is required for this item. PUBLIC NOTIFICATION AND COMMENTS: The Agenda was posted in front of City Hall on Thursday, July 23, 2015. The Agenda and staff report were posted on the City's website on Friday, July 24, 2015. Attachments: 1. Quotation from Hopkins Technical Products 2. Letter from mixer manufacturer identifying Hopkins Technical Products as the only factory authorized, stocking distributor in California Item 8.g. - Page 2 ATTACHMENT 1 <F I Hopkins Technical Products i; July 9,2015 Quote#: HTP-14709 City of Arroyo Grande 1375 Ash Street Arroyo Grande,CA 93421 I Attention:Shane Taylor i� Project:Medora Corporation—GridBee GS-'12 Submersible Tank Mixer �1 j We are pleased to offer you the following quotation for your favorable consideration. 1 �l �l 1. Medora Corporation GridBee Submersible Mixer. it Part#:GS-12 I� a. Dimensions:36" Long x 11.5" Diameter. i; b. Weight:70 Pounds. ' C. Power Requirements:120 Vac,60 Hz,Single Phase. it j; d. Warranty:5 years Parts and Labor. e. NSF/ANSI=61:Approved. f. Mixer Accessories: L 75-Foot Power cord. ;j ii. 75-Foot Suspension/Retrieval. ;I iii. Lexel Sealant. i +� iv. Cord Penetration Bolt. i. V. Kellum Grip Cord Strain Relief. j vi. Cord Grip. vii. NEMA U Junction Box. viii. 1-5/16" Hole Saw. I; ix. Quick Link X. Operation Manual i; Qty.4 @...$7,890.00 each...$31,560.00 1 I, 2155 Elkins Way,Suite A Telephone:(925)240-216o Serving the water treatment industry j Brentwood,CA 94513 Telefas:(925)240-2166 with Municipal&Industrial chemical ww.11tpine.com metering equipment. 1� ,1 Item 8.g. - Page 3 i t City of Arroyo Grande Quote#: HTP-14709 x July 9,2015 I Page Two b k r 2. Freight to Jobsite: i b Qty.4 @...$100.00 each...$400.00 ti ;i 3. City of Arroyo Grande Tax Rate @ 8.0% i' i I. $ 31,560.00 x 8.0%-$2,524.80 I i, GRAND TOTAL FOR ABOVE...$.34;484.80 1' Terms: Net 30 Days. Quote is Valid for 60 Days. j State and Local taxes and fees Not included. l� F.O.B.: Brentwood Freight: Included Above Delivery: 1 week ARO. i� �i If you have any questions,or if we can be of further service, please do not hesitate to contact us at(925) 240-2160 Sincerely, I I Richard M. Hopkins General Manager Hopkins Technical Products, Inc. Item 8.g. - Page 4 ATTACHMENT 2 IGridBee' Main Office and Service Center David Summerfield Medora Corporation•3225 Hwy 22•Dickinson,NO•58601 6264 Urban St Arvada, CO 80004 +1 (701)225-4495•Fax(701)225-0002•www.medoraco.com 951-265-2321, Dave.S @Medoraco.com Arroyo Grande Water Department 300 East Branch Street Arroyo Grande, CA 93420 July 1, 2015 Dear Mr Taylor, This letter confirms that Hopkins Technical Products based out of Brentwood, CA is the only factory authorized, stocking distributor for the Medora Corporation GS series potable tank mixers in the State of California. The GS series potable tank mixing line includes both the electric GS-9 and GS-12 potable tank mixers. Thank you for your interest of our potable tank mixing equipment. Sincerely,• j' 'S David Summerfield Regional Manager Medora Corporation Item 8.g. - Page 5 THIS PAGE INTENTIONALLY LEFT BLANK Item 8.g. - Page 6