DDW-2024-011362

September 26, 2024
Zachary Renstrom, Manager
Washington County Water Conservancy District
Washington County WCD – Sand Hollow
533 East Waterworks Drive
St. George, Utah 84770
Subject:Plan Approval, Sand Hollow Well 2 Chemical Rehabilitation, (WS005);
Washington County WCD – Sand Hollow, System #27073, File #16607
Dear Zachary Renstrom:The Division of Drinking Water (the Division) received the plan from you to do a chemical rehabilitation of Sand Hollow Well 2 on September 17, 2024. This project
has met the conditions for receiving a plan approval.Due to high amounts of iron bacteria and other scale buildup, Sand Hollow Well 2 (WS005) was taken out of production several years
ago and has been listed Inactive in the Division’s Inventory. Water Systems Engineering, Inc. did a complete well profile analysis and provided a recommendation for how to rehabilitate
the well and bring it back into production. You have contracted with Widdison Well Services to implement the recommendations outlined by Water Systems Engineering, Inc. A basic description
of the well rehabilitation and chemicals to be used is provided below. Mechanical cleaning of the well using brushing and swabbing followed by bailing to remove as much physical material
from the well casing as possible.Chemical Cleaning with acid descaler and water using the following chemicals that are ANSI/NSF 60 certified:Bonderite 103, NPF35% Hydrochloric AcidKlearWell
186 BioMin DispersantKlearWell NIS SurfactantSoda Ash - for neutralization, as needed12.5% Sodium Hypochlorite for disinfectionThese chemicals will be introduced into the well in prescribed
quantities, according to the plan that was submitted, and will be left in the well up to 48 hours. The well will be swabbed to remove scaling with the acid descaler in the well. Once
this is complete, the chemicals will begin to be removed and held in a Baker Tank, while the pH level is monitored and neutralized with soda ash. The last step is to disinfect the well
using a 275 mg/l (ppm) dose of chlorine. The chlorine solution will be removed and neutralized before collection and disposal.
We have completed our review of the plans submitted by you as recommended and prepared by Water Systems Engineering, Inc.and find they basically comply with the applicable portions of
Utah’s Administrative Rules for Public Drinking Water Systems in R309. On this basis, the plan for the Sand Hollow Well 2 (WS005) Chemical Rehabilitation is hereby approved.
This approval pertains to construction only. Since this well has been listed as Inactive, and it is our understanding that you intend on making it Active, an Operating Permit must be
obtained from the Director before Sand Hollow Well 2 may be put back in service. You should also work closely with Division Staff to meet any additional requirements since it has been
Inactive. A checklist outlining the items required for operating permit issuance is enclosed for your information.Approvals or permits from the local authority or the county may be necessary
before beginning construction of this project. As the project proceeds, notice of any changes in the approved design, as well as any change affecting the quantity or quality of the delivered
water, must be submitted to the Division. We may also conduct interim and final inspections of this project. Please notify us when actual construction begins so that these inspections
can be scheduled.
This approval must be renewed if construction has not begun or if substantial equipment has not been ordered within one year of the date of this letter.
If you have any questions regarding this approval, please contact J. Paul Wright, P.E., DEQ Southwest District office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
JPW/mrn/mdbEnclosures –Operating Permit Checklistcc:Jeremy Roberts, Southwest Utah Public Health Dept., [e-mail] Renstrom, Washington County WCD, [e-mail]
Bundy, Washington County WCD, [e-mail]. Paul Wright, P.E., DEQ Southwest District Engineer, [e-mail] 27073 16607 WS005 Well Rehab
Utah Division of Drinking Water ― Checklist for Issuing Operating PermitsWater System Name:System Number: Project Description:File Number:
Items 1 through 8 below must be submitted to the Division and found to be acceptable prior to operating permit issuance (unless a water line project meets the requirements of R309-500-7
and is not required to obtain an Operating Permit).
Distribution lines (not including in-line booster pump stations) requiring Plan Approval may be placed into service prior to submitting all of the following items and receipt of Operating
Permit if the water system has received items 1 and 4 below.☐1.Certification of Rule Conformance by a professional engineer (P.E.) that all conditions of Plan Approval were accomplished,
and if applicable, changes made during construction were in conformance with rules R309-500 through 550☐2.As-built or record drawings incorporating all changes to approved plans and
specifications (unless no changes were made to the previously approved plans during construction)☐3.Confirmation that as-built or record drawings have been received by the water system☐4.Satisfactory
bacteriological samples as evidence of proper disinfection and flushing in accordance with the appropriate ANSI/AWWA standards:
☐ANSI/AWWA C651-14 AWWA Standard for Disinfecting Water MainsTwo consecutive sample sets at least 16 hours apart, none positive (e.g., every 1,200 feet, end-of-line, each branch)☐ANSI/AWWA
C652-11 AWWA Standard for Disinfection of Water-Storage FacilitiesOne or more samples, none positive☐ANSI/AWWA C653-13 AWWA Standard for Disinfection of Water Treatment PlantsTwo consecutive
samples per unit, none positive, no less than 30 minutes apart☐ANSI/AWWA C654-13 AWWA Standard for Disinfection of WellsTwo consecutive samples, none positive, no less than 30 minutes
apart☐5.Water quality data, where appropriate [For example, include raw and finished water data that demonstrate satisfactory performance of the treatment facility; sample should be
taken from a storage tank for residual volatile organic compounds after tank interior re-coating; etc.]☐6.If applicable, all other documentation that may have been required during the
plan review process☐7.If applicable, confirmation that the water system owner has received the O&M manual for the new facility☐8.If applicable, location data of new storage tank, treatment
facility, or source