Change to Chloramines. Teresa Rogers Texas Commission on Environmental Quality Water Supply Division - Utilities & Districts Section

Change to Chloramines Teresa Rogers Texas Commission on Environmental Quality Water Supply Division - Utilities & Districts Section

Change to Chloramines Using Chloramines Requires Getting TCEQ Approval Before You Begin

Change to Chloramines Give us the RIGHT STUFF!

Change to Chloramines How to Get Projects Approved? Give the Right Stuff Include Time for Review Learn from Goat MUD

Change to Chloramines How to Get Projects Approved The Right Stuff Cover Letter Plan Review Submittal Form Engineering Report Plans & Specs

Change to Chloramines How to Get Projects Approved The Right Stuff Sealed Cover Letter Written Request for Exception Project Description

Change to Chloramines How to Get Projects Approved The Right Stuff Sealed Cover Letter Written Request for Exception The [District] intends to change its disinfectant from chlorine to chloramines and requests approval of an exception per 30 TAC 290.39(l) and 290.42(e)(3)(G) to change its disinfectant from chlorine to chloramines.

Change to Chloramines How to Get Projects Approved The Right Stuff Sealed Cover Letter Project Description The [District] intends to add additional chlorination lines including two (2) 200 ppd each gas chlorinators. LAS injection system.including two (2) 2.0 gph each chemical metering pumps and one (1) 250 gallon HDPE double walled

Change to Chloramines How to Get Projects Approved The Right Stuff Cover Letter Plan Review Submittal Form Engineering Report Plans & Specs

Change to Chloramines How to Get Projects Approved The Right Stuff Plan Review Submittal Form X Exception X Other - Explain Complete and Seal

Change to Chloramines How to Get Projects Approved The Right Stuff Cover Letter Plan Review Submittal Form Engineering Report Plans & Specs

Change to Chloramines How to Get Projects Approved The Right Stuff Engineering Report Existing Facilities Proposed Facilities Calculations

Change to Chloramines How to Get Projects Approved The Right Stuff Engineering Report Existing Facilities Size Capacity Site Plan Proposed Facilities Calculations

Change to Chloramines How to Get Projects Approved The Right Stuff Engineering Report Existing Facilities Proposed Facilities Size Capacity Site Plan Calculations

Change to Chloramines How to Get Projects Approved The Right Stuff Engineering Report Existing Facilities Proposed Facilities Calculations Chemical Dosing Feed Pump Sizing Chemical Tank Sizing

Change to Chloramines How to Get Projects Approved The Right Stuff Cover Letter Plan Review Submittal Form Engineering Report Plans & Specs

Change to Chloramines How to Get Projects Approved Each Sheet SEALED The Right Stuff Plans & Specs Bound Cover SEALED

Change to Chloramines How to Get Projects Approved The Right Stuff Plans & Specifications Site plan with yard piping and location of all existing & proposed facilities Chemical injection & monitoring point locations

Change to Chloramines How to Get Projects Approved? Give TCEQ The Right Stuff! (1) Cover Letter (2) Submittal Form (3) Engineering Report (4) Plans & Specs

Change to Chloramines How to Get Projects Approved? The Right Stuff Include Time for Review Goat MUD Go Through

Change to Chloramines Include Time for Review Since 2004 ~600 conversions 188 in Harris County 2 in Fort Bend County ~50% Harris County MUDs Converted to Chloramines

Change to Chloramines Include Time for Review TCEQ Review Time 45-60 Days from Receipt

Change to Chloramines Include Time for Review TCEQ Review Process 150-200 Plan Sets Per Month

Change to Chloramines Include Time for Review How to Get Projects Approved? Avoid the Rush! Schedule time for TCEQ review

Change to Chloramines How to Get Projects Approved? Give the Right Stuff Include Time for Review Learn from Goat MUD

Goat MUD What happened?

First Go Through NO Cover Letter NO TCEQ Plan Submittal Form NO Engineering Report NO Plans & Specs Oh no!

Change to Chloramines Goat MUD WHAT TO DO NOW? Hire an Engineer!

Submit the complete package! Engineers Tasks: Draft Cover Letter Complete Submittal Form Write Engineering Report Develop Plans & Specs

Second Go Through Missing calculations Missing details in drawings Missing specs on tanks & pumps Missing BFP on makeup water lines Missing NSF certification chemicals

Third time s a charm! What Goat MUD did right! Cover Letter Plan Review Submittal Form Engineering Report (Example) Plans & Specs (Example)

The Engineering Report Existing Facilities 650 GPM well & 650 GPM SW 2000 GPM service pumps One chlorinator Proposed Facilities Calculations

The Engineering Report Existing Facilities Proposed Facilities 38% 1.2 SG NSF certified LAS Two feed pumps GW / SW One 200 gal bulk storage tank w/containment Calculations

Engineering Report Existing Facilities Proposed Facilities Calculations Chemical Dosing Feed Pump Sizing Chemical Tank Sizing

Engineering Report Calculations Chemical Dosing Feed Pump Sizing Chemical Tank Sizing

Engineering Report Calculations Chemical Dosing Stoichiometry Target residual 2.0 mg/l Cl 2 Assume 0.0 mg/l Cl 2 SW Feed Pump Sizing Chemical Tank Sizing

Engineering Report Calculations Chemical Dosing Feed Pump Sizing (2 pumps) LAS dose Design flow rate GW / SW LAS feed rate Chemical Tank Sizing

Engineering Report Calculations Chemical Dosing Feed Pump Sizing Chemical Tank Sizing 15 day supply Design flow the smaller of (GW + SW) or SP Containment

Calculations Chemical Dosing Stoichiometry FORMULA MW RATIO RATIO Cl 2 / (NH 4 ) 2 SO 4 CL 2 /AS-N MW Cl 2 = (35.5)(2) = 71.00 5.07 MW NH 3 -N = 14.00 1.08 MW Ammonium Sulfate-(NH 4 ) 2 SO 4 = 132.0 4.71 MW Ammonium Sulfate-N = (14)(2) = 28.00

Engineering Report Calculations Chemical Dosing Stoichiometry Target residual 2.0 mg/l Cl 2 Assume 0.0 mg/l Cl 2 SW Calculate LAS dose (mg/l) 2.0 mg/l Cl2*(1 mg/l AS-N/1.08 mg/l Cl2) / 0.38 = 4.87 mg/l (or ppm) LAS Soln

Engineering Report Calculations Chemical Dosing Feed Pump Sizing Chemical Tank Sizing Choose Appropriate Flow Rate

Engineering Report Calculations Choose Appropriate Flow Rate ª Feed Pump Sizing (2 pumps) Ground Water (GW) / Surface Water (SW) ª Tank Sizing - smaller of Total source capacity (GW + SW) or Total service pump capacity (SP) Goat MUD Capacity (GPM) GW 650 / SW 650 / SP 2000 1300 GPM < 2000 GPM

Engineering Report Calculations Chemical Dosing Feed Pump Sizing Chemical Tank Sizing Convert Flow to MGD (1300 GPM) * (1440 min/day/10 6) = 1.87 MGD

Engineering Report Calculations Feed Pump Sizing (2 pumps) LAS dose LAS feed rate Calculate LAS feed rate lb/day [4.87 ppm LAS *1.87 MGD* 8.34 lb/gal] = 76.0 lb/day LAS Soln

Engineer Report Calculations Feed Pump Sizing (2 pumps) LAS dose Design flow rate GW + SW LAS feed rate ( x 1.5 ) Calculate LAS feed rate gal/day [ 76.0 lb/day LAS] / [1.2 SG*8.34 lb/gal ] = 7.6 gal/day x 1.5 = 11.4 gal/day LAS feed

Engineer Report Calculations Chemical Tank Sizing 15 day supply Design flow rate (GW + SW) or SP whichever is smaller Containment Calculate tank storage 7.6 gal/day LAS soln x 15 Days = 114 gal LAS soln

Engineer Report Calculations Chemical Tank Sizing 15 day supply Design flow rate (GW + SW) or SP Containment Calculate Goat MUD Tank Containment 200 gal LAS tank x 1.10 = 220 gal containment

Engineer Report Calculations Consider Double Walled Tanks Screened openings & connects through domed inner roof One drain close to bottom outer shell Inner tank level indicator & method for leak detection Anti-siphon device on piping

Engineer Report Calculations Double Walled Containment LAS

What Goat MUD did right! Cover Letter Plan Review Submittal Form Engineering Report Plans & Specifications

Plans & Specifications Locate injection & monitoring Site plan & yard piping for existing & proposed facilities Technical Specifications

Plans & Specifications Location GW line Inject LAS at least two (2) pipe diameters or 4-6 feet downstream of chlorine injection point Chlorine > Ammonia with stingers at the same depth

Plans & Specifications Location SW line (Booster Chloramination) Inject LAS upstream of chlorine as close as possible Ammonia > Chlorine with stingers at the same depth

Plans & Specifications Monitoring Instruments Must have ability to monitor for these parameters: free ammonia monochloramine total chlorine free chlorine

Plans & Specifications Locate injection & monitoring points Site plan with yard piping for existing & proposed facilities Technical Specifications

Site Plan Well Cl 2 LAS TCl 2 Mono FAA Ground Water GST D Authority Meter TCl 2 Mono FAA LAS Surface Water Cl 2 TCl 2 Mono FAA HS Pumps TCl 2 FAA NO 2 NO 3

Plans & Specifications Locate injection & monitoring points Site plan with yard piping for existing & proposed facilities Technical Specifications

Plans & Specifications Technical Specifications All proposed equipment Ammonia Lab equipment Pump model, feed rate range ANSI/NSF certified chemical Chemical tank ASTM standard Compatible/UV resistant material

Change to Chloramines Recap: How to Get Projects Approved? Give the Right Stuff Include Time for Review Learn from Goat MUD

Third time s a charm! Conditional Approval!

Conditional Approval Conditions: ª Provide TCEQ with monitoring plan Record weekly Before/after changes in source water or dosing

Conditional Approval Notifies PWS Notifies PWS N PWS N PWS Notifies PWS PWS N N ª Provide TCEQ Certification of Delivery with copy of notice

What Goat MUD did right! Verify compliance w/tceq design requirements Adequately describe the system Calculate dosing and feed rates Size pumps and tanks Consider containment Select ammonia Design booster chloramination system Locate injection & monitoring points Remember TCEQ monitoring & reporting requirements

How to Get Projects Approved Summary Give the Right Stuff Include Time for Review Learn from Goat MUD

APPROVED!

Change to Chloramines Teresa Rogers Texas Commission on Environmental Quality Water Supply Division Plan & Groundwater Section trogers@tceq.state.tx.us 512.239.1734