Hollis Select Board Transparency Archive

027001dd0358ea65ac00bf310400

FW: ME0092920 - Hollis Town Farm Road - Change Application Approval

From

• Dick Darling <[email protected]>

To

• Carl Helsel <[email protected]>
• Duane Hanson <[email protected]>
• Jack Rogala <[email protected]>
• Matt Morrill <[email protected]>
• Michael Harvey <[email protected]>
• Ralph Wesinger <[email protected]>
• Roger Hicks <[email protected]>
• Walter Longfellow <[email protected]>

Cc

• Chuck Applebee <[email protected]>

Date

Tue, Jun 23, 2026 · 5:40 p.m. ET

• ME0092920 - Hollis Town Farm Road - ENG Approval.pdfNot posted

  The original PDF is not in this public copy. The words copied from it are below.

  Read from the file

  Drinking Water Program  www.medwp.com  Phone: (207) 287-2070  TTY Users: Dial 711 (Maine Relay)  Fax: (207) 287-4172 Maine Department of Health and Human Services Maine Center for Disease Control and Prevention 11 State House Station 286 Water Street Augusta, Maine 04333-0011 Tel; (207) 287-8016; Fax (207) 287-9058 TTY: Dial 711 (Maine Relay) Janet T. Mills Governor Sara Gagné-Holmes Commissioner June 23, 2026 Jack Rogala 34 Town Farm Road Hollis, ME 04042 Re: WATER SYSTEM DESIGN for HOLLIS TOWN FARM ROAD CHANGE APPLICATION APPROVAL PWSID# ME0092920 Dear Jack Rogala: As required by 22 M.R.S.A., Section 2612, the Drinking Water Program (DWP) has reviewed the design plans and specifications submitted by Richard E. Darling, P.E., for the installation of radon, PFAS, and arsenic water treatment equipment due to MCL exceedance for arsenic at Hollis Town Farm Road in Hollis, ME. Specifically, the project includes the installation of:  (1) Viqua Water Filter Housing (Model # AWP40B-V) with Pentair Pentek DGD Series 5-micron Cartridge Filter (Model # DGD-5005)  (1) RE Prescott Commercial Bubble-Up Radon Aeration Unit (Model # CBU-415)  (2) 13”x54” Clack Mineral Tanks, with Clack 1191 In-Out Heads, in lead-lag configuration, each containing 2.5-cuft of Clack Catalytic-High Activated Carbon (CAT-HAC) with Clack Filter Sand and Gravel underbed for PFAS removal  (1) Oxidation tank comprised of a 13”x54” Clack Mineral Tank with Clack WS-1 Head, containing 2.5-cuft of Clack Catalytic-High Activated Carbon (CAT-HAC) with Clack Filter Sand and Gravel underbed, fed by an Air Pump AP1 Series air pump for iron oxidation  (1) 13”x54” Clack Mineral Tank with Clack WS-1 Head, containing 2.5-cuft of mixed media consisting of 1.0-cuft of Resintech SBG2-HP anion resin and 1.5-cuft of Resintech CGS cation resin with Clack Filter Sand and Gravel underbed for Arsenic Removal  (1) 45-gallon Clack 18” Round Brine Tank (Model # G21840[*]B1C00) with the use of Morton Pure and Natural Water Softening Crystals  (2) 13”x54” Clack Mineral Tanks with Clack 1191 In-Out Heads in lead-lag configuration, each containing 2.5-cuft of Resintech ASM-10-HP anion resin with Clack Filter Sand and Gravel underbed for arsenic removal  (1) 13”x54” Clack Mineral Tank with Clack WS-1 Head, containing 2.5-cuft of Clack Calcite with Clack Filter Sand and Gravel underbed for pH adjustment.  (2) Norwesco 500-gallon Free Standing Water Tanks (Mode # N-43616) with SJE Pumpmaster Pump Switches (Model # 1002707)  (2) DAB EsyBox Max 60/120M Booster Pumps  (2) Viqua Arros Model 22 UV Disinfection Systems - Product is not a 4-log UV treatment system

  The arsenic removal system will backwash to the combined septic field approximately every 11 days, with approximately 190 gals to waste. The backwash frequency is based on measured water use in the building averaging 250 GPD. The septic system is designed for 1,275 GPD. The proposed design is in compliance with applicable standards and policies, and approval is granted with the following conditions:  Bypasses on PFAS treatment are not allowed. A built-in bypass (e.g., a Clack V3006 bypass assembly or similar) on an individual GAC unit control valve is also not permissible for PFAS treatment. Any built-in or spooled bypasses must be removed prior to final installation. No other permanent bypasses of DWP-required treatment are permitted.  All new components of the treatment system that will come in contact with the water must be certified to meet NSF/ANSI/CAN Standard 61.  UV disinfection systems that will come in contact with the water must be certified to meet NSF/ANSI/CAN Standard 55.  All new chemicals added to drinking water must be certified to meet NSF/ANSI/CAN Standard 60.  All plumbing components must meet the Reduction of Lead in Drinking Water Act (requirements and exemptions can be found at www.epa.gov/safewater)  If not already in place, a raw water sample tap, directly followed by a check valve, must be installed prior to any treatment, storage, or pressure tanks.  Sampling taps shall be installed before and after the UV units.  All drinking water treatment equipment shall be labeled to indicate the purpose of the equipment and the contents of the vessels, e.g., arsenic removal and type of media.  All backwash line(s) must have an air gap that is at least two times the diameter of the discharging pipe prior to the inlet of the sanitary sewer line.  Salt used for arsenic removal must be certified to meet NSF Standard 60. Evidence of certification must be provided at the system inspection.  The waste air discharge must be vented to the outside, located above the eaves of the roof, and above head level. When treating radon, the vent must be positioned a minimum of 10 feet above ground level (see ASTM E2121-03). Place the discharge vent in a location that will prevent exposure of people to waste air, away from windows, and on the downwind side of the prevailing wind direction.  The waste air discharge line(s) must be a minimum of 3” diameter (nominal) (see ASTM E2121- 03).  The waste air discharge line(s) must include a manufactured T-type vent cap (Ex.: Vent Cap for 3” or 4” Schedule 40 by RadonAway, or similar), or the vent end should be turned down towards the ground to prevent the entry of dust, bird droppings, small animals, and other bacterial hazards.  The waste air discharge vent location must be positioned away from the air intake supply line.  The waste air line connections must be air-tight within the structure housing the aeration system to prevent leakage of hazardous gas. The following are not requirements, but are recommendations to optimize the water system:  Mist will carry over from the aerator into the waste air vent line, and condensation may also occur. Both the intake and waste air lines should be sloped to allow drainage for moisture.  Use HEPA filters on the input air supply to the aeration blowers.

   Install a rodent screen only at the end of the vent; installing a rodent screen at some other point in the pipe allows creatures or organic matter to accumulate in the pipe and decay, becoming a probable future source of drinking water contamination. The following changes will also be made to your monitoring and reporting requirements as a result of this treatment change:  Your system will remain on 6-month monitoring for lead and copper once the treatment is installed. You will need to collect a set of 5 distribution lead/copper samples from high-risk locations, collecting your first set after the treatment has been in place/operational for 30 days.  The Drinking Water Program (DWP) also recommends your system collect daily pH readings for the first 30 days after treatment is installed. This will help determine if the treatment is impacting your water quality.  System is encouraged to continue with pH readings at least every other week after the first month to help track when calcite media is depleted. This information can be recorded on a monthly operating report- MOR 001 or MOR 013.  After two 6-month rounds of sampling, the DWP will review the lead/copper results and determine if your system is eligible to move to a reduced testing frequency.  Once treatment is installed, collect a quarterly arsenic sample at the entry point to distribution (after the arsenic treatment) to ensure the treatment is functioning properly,  Collect routine maintenance arsenic samples at the port between the lead and lag filters each quarter to determine when the lead tank fails and needs to be replaced.  System will be placed on quarterly monitoring for PFAS once treatment is installed to ensure the treatment is working properly. Samples should be taken at the entry point to the distribution system after the arsenic treatment to ensure the treatment is working properly.  System should take periodic operations and maintenance (O&M) samples for radon to ensure your treatment is working properly but there is no routine required testing for this treatment.  System will remain on permanent monthly monitoring for bacteria- not eligible for quarterly monitoring.  System will have to take two bacteria samples per month- in the distribution system after each of the two UV units.  System should develop a maintenance/bulb replacement schedule to ensure the UV unit is working optimally at all times.  Your system should complete a Monthly Operating Report (MOR) and submit it to the DWP by the 10 th of each month (for the month prior) using the small system UV monthly operating report - MOR 014. MORs can be found on our website at https://www.maine.gov/dhhs/mecdc/sites/maine.gov.dhhs.mecdc/files/cet/MOR-014.pdf. The MOR can be submitted electronically to the following email: [email protected]. Immediately upon installation, contact your Public Water System Inspector conduct an inspection and review the operation of the treatment system with the water operator before treatment is brought on- line. If you have any questions, please contact your Public Water System Inspector, Ralph Wesinger, at 207- 441-6573 or at [email protected].

  Sincerely, Joshua Gildert, P.E. Engineering Review Drinking Water Program 207-215-7172 [email protected] EC: Richard Darling (WQ&CS), Ralph Wesinger (DWP), Chuck Applebee (WQME), Eduard Chenette (DWP), Maraquita Hollman (DWP), Amilyn Stillings (DWP)