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M I N N E S 0 T A <br /> ' <br /> � DEPARTMENToFHEALTH <br /> Protectin� maintaining and improving the heulth of all Minnesotans <br /> Date: August 19,2008 <br /> To: Public Water Supply O n rs/Operators <br /> From:��Gerald G. Smith,P.E. <br /> Drinking Water Protection Section <br /> Noncommunity Public Water Supply Unit <br /> Subject: Recent Revisions to Minnesota Rules, Chapter 4725, Department of Health, <br /> Wells and Borings <br /> You are being sent tYus notice because revisions to Minnesota Rules, Chapter 4725,Department <br /> of Health, Wells and Borings(commonly referred to as the"Minnesota Well Code")went into <br /> effect on August 4,2008. It is beyond the scope of this notice to inform you of all the changes <br /> that have been made in the Well Code; however, there are some revisions that pertain specifically <br /> to public water supply wells. These revisions are found in Minnesota Rules,part 4725.5825 and <br /> are briefly described below. <br /> - 1. Notification of drilling required. A licensed well contractor must notify the Minnesota <br /> Department of Health(MDH)of the proposed construction starting time of a public water <br /> supply well 24 hours in advance of beginning construction. <br /> 2. Additional disinfection or development required. Public water supply wells that are <br /> constructed in unconsolidated formations using a rotary or other method that creates an <br /> annular space and uses bentonite drilling fluid must eitlaer 1)provide an additional well <br /> disinfection after completion of driiling and prior to grouting or, 2) spend at least one hour <br /> developing the well by agitating and forcing water out of the well screen. <br /> 3. Additional grouting requirements. A public water supply well constructed with a method <br /> that creates an open annular space must be properly grouted from within ten feet of the <br /> bottom of the well casing to the ground surface or base of the pitless adaptor or unit. This is <br /> commonly referred to as"full length grout."An annular space is the void between the well <br /> casing and borehole that is created by many commonly used well construction techniques. <br /> 4. Sampling faucet required. Each new public water supply well must have a metallic water <br /> sampling faucet. The faucet must be installed a minimum of 12 inches above the ground <br /> surface,be installed between the well and water storage, and prior to any water treatment <br /> devices. <br /> � General Informarion: 651-201-5000 • Toll-free: 888-345-0823 • TTY:651-201-5797 • www.health.state.mn.us <br /> An equal opportunity employer <br />