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PROJ00124
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Last modified
11/19/2009 11:01:58 AM
Creation date
10/5/2006 11:36:51 PM
Metadata
Fields
Template:
Loan Projects
Contract/PO #
C153394
Contractor Name
Wellington, Town of
Contract Type
Loan
Water District
1
County
Larimer
Bill Number
SB 81-439
Loan Projects - Doc Type
Feasibility Study
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />DC3IG: S1.MV\RY <br /> <br />... <br /> <br />(273,750,000 gal/year or 838 ac. ft./year) <br /> <br />Design Flow Rate 750,000 GPO Peak Flow Rilte 900,000 GPO <br />Progress Description - Lime/Soda softening and/or Turbidity Removal. <br />Treatrrent Steps - Flash Mixing, Flocculation, Sedirrentation, Dual ~ia <br />Gravity Filtration, Post Chlorination and/or Pre-chlorination. <br /> <br />1. Flash Mix: <br />Cc:lTpartrrent Size <br />Volurre <br />Detention tirre <br />'I';rpe of Agitation <br />Design Velocity Gradient <br /> <br />4"x 4' x 14' SWD <br />224 ft.) <br />6. 6 minutes <br />Mechanical <br />300 see - 1 <br /> <br />O1cmicals to be <br />L~ <br />Soda Ash <br />Aluminum Sulfate <br />l'oNdered 1\ctivated Carbon <br /> <br />added to Flash Mix Carpa.rtnent (Lime Soda softening) <br />240 mg/l <br />160 mg/l <br />30 mg/l <br />as required <br /> <br />Sludge Fecyc1e fran clarifier sludge hopper via 4" 0 air liftpunp. <br /> <br />II. Flocculation: <br />CaTpartnent Size <br />Volurre <br />Detention tllre <br />Type of flocculator <br /> <br />Design Velocity Gradient <br /> <br />III. Sed.iJrentation: <br />,: Carpa..c Ulel1t Size <br />, l Volurre <br />,; Detention time <br />.' Type of sludge reroval <br />'Setting tube area <br />~. design tube flow <br />Plug Flow Velocity <br />Overflow weir length <br />Weir overflow rate <br /> <br />IV. Dual >>:rlia Gravity Filtration: <br />Number of cells <br />Q!ll Size <br />Total filter area <br />Design filtration rate <br />Max. filtration rate (intermittant) <br />Design max. backwash rate <br />Backwash punps <br />Backwash operation <br /> <br />Underdrain <br /> <br />M:dia <br /> <br />9 <br /> <br />12' X 12'-6" x 14' SWD <br />2100 ft.' <br />30 minutes <br />Horizontal paddle variable <br />speed <br />Mjustable with maximlm 75 <br />see. -1 <br /> <br />,\ <br />IS' x 30' x ~4' SlID: 'i <br />:6300 ft.' :J <br />" <br />i3.l hrs. ; i <br />,Travelling Siphon' Bridge <br />',260 ft.' mi.nirrun ,. <br />2 GPM/ft.' <br />0.33 FFM <br />88 ft. <br />8,522 GPO/ft. <br /> <br />5 <br />5' x 5' <br />125 ft.' <br />4.17 GPM/ft.' <br />5.2 GPM/ft.2 <br />20 GPM/ft.' <br />none required <br />hydraulic differential self <br />backwashing filters <br />Type 304 stainless steel <br />perforated plate <br />12" support gravel <br />12" 0.55 mn sand <br />18" No. 1 Anthracite <br />
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