Public Water Supply Well Requirements - TCEQ...Jan 15, 2019 · Public Drinking vs. Domestic Water Wells. Poorly Constructed and Operated Wells can result in \爀ऀ䈀愀挀琀攀爀椀漀氀漀最椀挀愀氀
34
Public Water Supply Well Requirements Plan Review Team Austin, Texas January 15, 2019 Craig A. Stowell, P.E. Plan Review Team (PRT)
When is a PWS well required? – See definition: A system that provides to the public water for human consumption through pipes or other constructed conveyances, which includes all uses described under the definition for drinking water. Such a system must have at least 15 service connections, or serve at least 25 individuals at least 60 days out of the year.
Other Rules• Domestic Wells
• 16 TAC §76 Texas Department of Licensing and Regulation
• Both PWS and Domestic Wells• Local Groundwater Conservation Districts• Texas Water Development Board http://www.twdb.state.tx.us/groundwater/conservation_districts/index.asp
Presenter
Presentation Notes
TDLR regulates domestic wells TWDB has map of all GCDs
Public Drinking vs. Domestic Water Wells
Presenter
Presentation Notes
Poorly Constructed and Operated Wells can result in Bacteriological and/or Chemical Contamination of Wells Domestic Water Wells Less stringent siting and construction No required treatment or monitoring
Process Flow Diagram for Proposed Wells
Well Proposal to TCEQ
TCEQ Approves Construction or
Request Information
Upon Approval, Well is Constructed. Well
Data is Gathered and Submitted to TCEQ
Interim Use Granted or Denied
Official Sampling and Results. Continuous
Monitoring
Presenter
Presentation Notes
Depicts the plan approval process including plans approval, well approval and final sampling and approval.
Forms and Checklists
• Plan Review Websites:https://www.tceq.texas.gov/drinkingwater/planrev.html
• Plan Submittal information• Checklists• Forms• TCEQ Standard Construction Notes• Links to Public Drinking Water Staff Guidance
Documents• Check Plan Review Status
Presenter
Presentation Notes
Plan Review Website - https://www.tceq.texas.gov/drinkingwater/planrev.html Check Plan Review Status Download Well Construction and Well Completion for Interim Approval Checklists Get updates on rules and new information Links to Public Drinking Water Staff Guidance Documents
• Cover letter• Form TCEQ-10233• Engineering report• Pollution hazard survey• Draft sanitary control easement• Scalable map• Engineering plans & specifications
Presenter
Presentation Notes
Proposed Well Construction Checklist Engineering Report; System capacity requirements Well size and components Engineering plans & specifications by a Texas registered professional engineer; [§290.39(d)(1)] Pollution hazard survey; [§290.41(c)(1)(E)] Draft sanitary control easement; [§290.41(c)(1)(F)] Well location map.
Proposed New Systems Additional Documents
• Business plan• Core Data Form TCEQ-10400• Water systems within ½ mile and
evidence of attempt to connect• Two copies of submittal
Presenter
Presentation Notes
Business plan; [§290.39(f)] Engineering Report; [§290.39(e)(1)] Capacity requirements; [§290.45] Present and Future conditions Normal and Emergency operation Water systems within ½ mile and evidence of attempt to connect; [§290.39(c)] Core Data Form
Engineering Report
• Area Served• PWS classification• Capacity Requirements• Proposed Facilities
• Abandoned or inoperative wells• Landfill and dump sites• Animal feedlots• Military, industrial or wood treatment facilities• Liquid petroleum and petrochemical production,
storage and transmission facilities• Class 1, 2, 3 and 4 injection wells• Pesticide storage and mixing facilities
[§290.41(c)(1)(E)]
Presenter
Presentation Notes
Survey of Pollution Hazards within ¼ mile Abandoned or inoperative wells Landfill and dump sites Animal feedlots Military, industrial or wood treatment facilities Liquid petroleum and petrochemical production, storage and transmission facilities Class 1, 2, 3 and 4 injection wells Pesticide storage and mixing facilities [§290.41(c)(1)(E)]
Set Back Distances• 50 feet
• Sanitary sewer, septic tank, storm sewer• Livestock in pasture
• 150 feet• Septic tank drain-field, low dosage irrigation, low
angle OSSF• UG petroleum or chemical storage tank• Improperly constructed well
[§290.41(c)(1)(A)-(D)]
Presenter
Presentation Notes
50 feet Sanitary sewer, septic tank, storm sewer Livestock in pasture 150 feet Septic tank drain-field, low dosage irrigation, low angle OSSF UG petroleum or chemical storage tank Improperly constructed well [§290.41(c)(1)(A)-(D)]
Site map(s) with appropriate scale showing the following: [§290.41(c)(3)(A)] (i) Proposed location of the well with coordinates; (ii) Named roadways; (iii) All property boundaries within 150 feet of the proposed well location and the property owners’ names; (iv) Concentric circles with the proposed well location as the center point with radii of 10 foot, 50 foot, 150, foot, and ¼ mile; (v) Any site improvements and existing buildings; (vi) Any existing or potential pollution hazards; and (vii) Map must be scalable with a north arrow.
Sanitary Control Easement
• Use restrictions within 150 feet of well• New Easement Form TCEQ -20698• Easements must record by landowners within
150 foot of well (draft until well completion)• No easement required for PWS owned
property (property deed)• Improperly constructed wells must be
plugged
Presenter
Presentation Notes
Sanitary control easement Use restrictions within 150 feet of well- All setbacks and pollutions hazards. §290.41(c)(1)(F)(i) The sanitary control easement(s) secured shall provide that none of the pollution hazards covered in subparagraphs (A) - (E) of this paragraph, or any facilities that might create a danger of pollution to the water to be produced from the well, will be located thereon. §290.41(c)(1)(F)(ii) For the purpose of a sanitary control easement, an improperly constructed water well is one which fails to meet the surface and subsurface construction standards for public water supply wells. Residential type wells within a sanitary control easement must be constructed to public water well standards. [§290.41(c)]
Proposed Well Construction• Site Requirements:
• Premises, materials, tools and drilling equipment minimize contamination
• Water used for operations safe sanitary quality
• Drilling mud shall contain a chlorine residual of at least 0.5 milligrams per liter (mg/L)
• Slush pit - minimize contamination • Temporary toilet facilities within 150 feet • Safeguards from trespassers
Presenter
Presentation Notes
§290.41(c)(2) The premises, materials, tools, and drilling equipment shall be maintained so as to minimize contamination of the groundwater during drilling operation. §290.41(c)(2)(A)Water used in any drilling operation shall be of safe sanitary quality. Water used in the mixing of drilling fluids or mud shall contain a chlorine residual of at least 0.5 milligrams per liter (mg/L). §290.41(c)(2)(B) The slush pit shall be constructed and maintained so as to minimize contamination of the drilling mud. §290.41(c)(2)(C) No temporary toilet facilities shall be maintained within 150 feet of the well being constructed unless they are of a sealed, leakproof type.
Proposed Well Construction• Well Casing Requirements;
• AWWA Casing extends 18 inches above floor• Pressure cemented per AWWA Appendix C• Pressure cemented extends to developed
formation • Contains no more than 0.25% lead
Proposed Well Construction• Well Head Requirements;
• Two feet above 100-year flood elevation • Slab edge three feet from the outside wall of well
casing in all directions with slope • Sealed by a gasket or sealing compound • Blow-off line points downward• Sampling cock • Flow measuring devices
Proposed Well Construction• Other Requirements;
• Well gravel pack disinfected• Well disinfected per AWWA for six hours • All weather access road• Intruder resistance fence
Disinfection
• Disinfection facilities shall be provided for all groundwater supplies • Chlorine Gas • Sodium Hypochlorite• Chloramines (now in the rules)
• No exception needed except…
Presenter
Presentation Notes
§290.42(b)(1) Disinfection facilities shall be provided for all groundwater supplies for the purpose of microbiological control and distribution protection and shall be in conformity with applicable disinfection requirements in subsection (e) of this section. If water containing chloramines and water containing free chlorine are blended, then a case-by-case review (exception) under §290.39(l) of this title will be required; [§290.42(e)(3)(G)]
Treatment
• Treatment facilities required if water does not meet drinking water standards. • Arsenic• Iron and manganese • TDS• 4-log removal or inactivation of viruses based
on raw water sampling results• Corrosive water
Presenter
Presentation Notes
§290.42(b)(1) Disinfection facilities shall be provided for all groundwater supplies for the purpose of microbiological control and distribution protection and shall be in conformity with applicable disinfection requirements in subsection (e) of this section. §290.42(b)(8) The executive director may require 4-log removal or inactivation of viruses based on raw water sampling results required by §290.116 of this title (relating to Groundwater Corrective Actions and Treatment Techniques). §290.116(a) Applicability. All groundwater public water systems must comply with the treatment techniques and corrective actions of this section if a raw groundwater source sample was positive for fecal indicators or if the system is not required to conduct raw groundwater source monitoring because it provides at least 4-log treatment of viruses.
Ground Water Under the Direct Influence of Surface Water (GUI)
• Potential GUI if:• Drilled and/or pressure cemented less than
100 feet• Close influence to surface water• Will require microbiological sampling twice a
month for 24 months• If well is determined to be a GUI:
• 2,3,4 log treatment required• Surface water rules apply
Rule Exceptions
• Must precede the submission of plans• Submit to Technical Review & Oversight
Team (TROT)• Written request with documentation• Cite regulations for exception• Cannot compromise public health
Presenter
Presentation Notes
Must proceed the submission of plans Written Request with documentation Cite the regulations for exception Submit to TROT Cannot Compromise Public Health or Degrade service or water quality
submitted to Technical and Review Team (TROT) §290.39(c)(1) or §290.39(l)(1)
TROT Approves
Well plans and specifications submitted to PRT
Upon Approval, well data used for source water assessments, sampling, and monitoring
TROT Disapproves
Revise and resubmit if applicable
Presenter
Presentation Notes
The flow chart describes the exceptions process. An exception must be approved before the plans and specifications can be approved . The well data is used by source water assessments, sampling and monitoring §290.39(c)(1) (c) Required actions and approvals prior to construction. A person may not begin construction of a public drinking water supply system unless the executive director determines the following requirements have been satisfied and approves construction of the proposed system. (1) A person proposing to install a public drinking water system within the extraterritorial jurisdiction of a municipality; or within 1/2-mile of the corporate boundaries of a district, or other political subdivision providing the same service; or within 1/2-mile of a certificated service area boundary of any other water service provider shall provide to the executive director evidence that: §290.39(l)(1) The exception must be requested in writing and must be substantiated by carefully documented data. The request for an exception shall precede the submission of engineering plans and specifications for a proposed project for which an exception is being requested.
Common Exceptions
• Setbacks• Sanitary control easement• Improper pressure cementation• Treatment technologies
Presenter
Presentation Notes
Common Exceptions Setbacks – USTs, abandoned wells, livestock, pipelines, sewage, septic tanks, etc. can infringe on setback distance to well Sanitary Control Easement Unapproved Existing Wells – Risky due to common problems such as collapsed casing, inadequate cement, etc. and can result in increased sampling costs * Arsenic, TDS, Iron
Construct Well
• TCEQ Approval Letter• Construct in Accordance with the
approved plans and specifications• 48 hours notice to TCEQ before
cementing• Unforeseen circumstances, call TCEQ
Presenter
Presentation Notes
TCEQ Approval Letter Construct in Accordance with the approved plans and specifications 48 hours notice to TCEQ before cementing Unforeseen circumstances, call TCEQ
Well Completion Submittal
• Map with final well location• Well construction data• State of Texas well report• Cementing Certificate• Recorded sanitary control easement(s)• Final property deed• Well location – USGS 7.5 Min topographic map• 36 - hour pump test• Raw water chemical analysis• Bacteriological tests
Presenter
Presentation Notes
State of Texas well report Recorded sanitary control easement Well location – USGS 7.5 Min topographic map 36- hour pump test Raw water chemical analysis – Discuss Accredited Lab Bacteriological tests[§290.41(c)(3)(A)]
Water Corrosivity Corrosive Saturation Indices forDetermination of Corrosiveness
•Langelier Saturation Index•Ryznar Stability Index•Aggressive Index
TCEQ currently uses Tetra Tech Corrosion Model for calculations.
28
New Constituents Required• Lead• Total Alkalinity (as CaCO3)• Calcium (as CaCO3)• Sodium
29
Determination of Corrosiveness
• Three scenarios based upon two temperatures (10 and 25 degree Celsius)
•Noncorrosive•Slightly Corrosive•Corrosive
30
Presenter
Presentation Notes
In water that is soft, corrosion occurs because of the lack of dissolved cations, such as calcium and magnesium in the water. Water with high levels of sodium, chloride, or other ions will increase the conductivity of the water and promote corrosion
New Systems
• Noncorrosive: Use no Problem• Slightly Corrosive: Use granted with
follow-up engineering report or proposed corrosion control treatment required
• Corrosive: No use until follow-up engineering report or corrosion control treatment approved
31
Existing Systems• Lead and Copper tap sampling is reset to
routine vs. reduced.• Noncorrosive: Use no Problem• Slightly Corrosive: Use granted with follow-
up engineering report or proposed corrosion control treatment required
• Corrosive: No use until follow-up engineering report or corrosion control treatment approved
32
Final Steps
• Receive interim use• Arrangement of official samples to be
taken by TCEQ contractor• Continuous monitoring as PWS
Presenter
Presentation Notes
TCEQ to arrange for the official samples to be taken by TCEQ contractor if not done by 180 days – please call
