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Well Construction. TCEQ’S Environmental Trade Fair - Austin, Texas May 6-7, 2014 Craig A. Stowell, P.E. Utilities Technical R eview Team (UTRT). Protection Strategy Multi-Barrier Approach. Site restrictions Well construction Disinfection - Treatment Monitoring. TCEQ Rules.

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Well Construction

TCEQ’S Environmental Trade Fair - Austin, Texas

May 6-7, 2014

Craig A. Stowell, P.E.

Utilities Technical Review Team (UTRT)


Protection StrategyMulti-Barrier Approach

  • Site restrictions

  • Well construction

  • Disinfection - Treatment

  • Monitoring


TCEQ Rules

  • Public Water System (PWS) definition

    • 15 or more connections

    • 25 or more individuals at least 60 days

      [30 TAC §290.38(66)]

  • PWS well

    • 30 TAC §290.41(c) Groundwater sources and development

    • 30 TAC §290.42(b) Groundwater Treatment

      http://www.tceq.texas.gov/publications/rg/rg-195.html


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


Public Drinking vs. Domestic Water Wells


Process Flow Diagram for Proposed Wells


Proposed Well Submittal Documents

  • Cover letter

  • Form TCEQ-10233

  • Engineering report

  • Pollution hazard survey

  • Draft sanitary control easement

  • Scalable map

  • Engineering plans & specifications


Proposed New Systems Additional Documents

  • Business plan

  • Core Data Form TCEQ-10400

  • Water systems within ½ mile and evidence of attempt to connect


Engineering Report

  • Area Served

  • PWS classification

  • Capacity Requirements

  • Proposed Facilities

    • Disinfection system

    • Pressure tank

    • Storage tank

    • Pumps


Pollution Hazards Survey

  • 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)]


Set Back Distances cont.

  • 300 feet

    • Sewage wet well, lift station, drainage ditch

  • 500 feet

    • Sewage treatment plant, animal feed lots, solid waste disposal sites

    • Properties treated with sewage

      [§290.41(c)(1)(A)-(D)]


Set Backs


Map of Well Location


Draft Sanitary Control Easement

  • Use restrictions within 150 feet of well

  • Landowners must record easement

  • Improperly constructed wells

  • Substitute deed if PWS owns all property


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


Proposed Well Construction(continue 1)

  • 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(continue 2)

  • Well Head Requirements;

    • Two feet above 100-year flood elevation

    • Slab edge three feet from the 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(continue 3)

  • 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

      [§290.42(b)(1)]


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

      [§290.42(b)(2)]


Ground Water Under the Direct Influence of Surface Water


Rule Exceptions

  • Must proceed the submission of plans

  • Submit to Technical Review & Oversight Team (TROT)

    • Written request with documentation

    • Cite regulations for exception

    • Cannot compromise public health

      [§290.39(l)(1-4)


Exception Flow Chart


Common Exceptions

  • Setbacks

  • Sanitary control easement

  • Improper pressure cementation

  • Treatment technologies


Potential Approval Conditions

  • Steel casing required if petroleum tanks are in the vicinity of a well

  • Increased raw water sampling

  • Granted exceptions subject to revocation


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 UTRT at (512) 239-4691


Well Completion Submittal

  • 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

  • Bacteriological tests


Final Steps

  • Receive interim approval

  • Call TCEQ to arrange for the official samples to be taken by TCEQ contractor

  • Receive final approval

  • Continuous monitoring as PWS


PLAN REVIEW STAFF

  • Vera Poe, P.E. (Team Leader)[email protected]

  • Kamal Adhikari, E.I.T. [email protected]

  • Brian [email protected]

  • Heidi Graham, E.I.T. Heidi.Graham @tceq.texas.gov

  • John Lock, P.E. [email protected]

  • Craig A. Stowell, [email protected]

  • Johnathan Pi, P.E. [email protected]

  • Pritesh [email protected]

  • Jose Castillo, [email protected]

    Telephone (512) 239-4691

    TCEQ Website – www.tceq.texas.gov

    Plan Review Website:

    http://www.tceq.texas.gov/utilities/planrev.html


Forms and Checklists

  • Plan Review Website:

    http://www.tceq.texas.gov/utilities/planrev.html

    • Check Plan Review Status

    • Download Well Construction and Well Completion for Interim Approval Checklists

    • TCEQ Well Standard Construction Notes

    • Links to Public Drinking Water Staff Guidance Documents


Questions?

TCEQ

Utilities Technical Review Team

[email protected]

(512) 239-4633


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