Bear Trap Dunes Water Treatment Facility

Report conducted by

KPC Water Team

S Team members– Tim Sweany– Trevor Irvine– Thomas Burton– Tyler Wingate

S Experience– 10 years combined experience in Water/Wastewater field

Mission

KPC Environmental Group is an environmental company which performs water treatment consulting in Delaware.

• Purpose: Analyze Bear Trap Water Treatment plant– Determine compliance with regulations/ permits– Issue findings– Make Recommendations for possible improvements

Bear Trap CustomersS Area Served– Bethany Bay/Ocean View System– One of Five water treatment plants

Bear Trap CustomersS Population Served– 814 accounts in Bear Trap development– Seasonal occupancy (5,043 accounts system wide)• 3,992 Full time residents in system• 21,058 Transient residents from May-September

Aerial View of Facility

Facility Overview

S Construction Dates– Wells - April 2007– Plant - May 2008– Open - May 2008

S Wells– Well #1- 675 gpm– Well #2- 425 gpm– Water tower- 350,000 gal– Average production- 500,000 gpd– Maximum production- 775,000 gpd at 540 gpm– Maximum design production- 1,728,000 gpd

TreatmentS Pre-filtration Chemical Addition– Caustic, Chlorine, & Potassium Permanganate

S Greensand Filtration– 3 Filtration units with 540 gpm total flow– 180 gpm per filter

S Post-Filtration Chemical Addition– Caustic, Chlorine (Disinfectant) &

Zinc Orthophosphate

S Filter Backwash– Stored in decant tank– Re-treated at 54 gpm

Sampling, Testing and Data Recording

S Potassium Permanganate AnalyzerS Chlorine AnalyzerS pH AnalyzerS Chart Recorders– Chlorine– pH– Tower level– Decant tank level

Operator Lab and Testing

S Distribution sample– Once per week

S Treatment plant sampling– Pre-filtration– Post-filtration (each filter)– Effluent• Chlorine• Iron• pH• Zinc

Research and Regulations

S Operating Requirements– Operator visit three times per week

S Distribution System Monitoring Requirements– Monthly Bacterial 30 (May-Sept.)

4 (Oct.-April)– Lead and Copper 40 every six months– WQP2 6 every six months

S Facility Monitoring requirements– RIOC 1 every 9 years– RRAD 1 every 3 years– Fluoride and Nitrate 1 every year

S State of Delaware Drinking Water Branch

Research and Regulations cont.S Monitoring Summary– System failed lead and copper (2009-2010)– Bear Trap Dunes area had no failures

S Water Characteristics Influent Effluent

Iron 2.0 - 2.5 mg/L 0.00 - 0.11 mg/L

pH 6.25 7.5 - 8.0

Temperature 15.3 - 17.2 °C 13.9 - 18.8 °C

Chlorine Residual None 1.0 - 1.5 mg/L

Audit

S KPC conducted a facility audit/sanitary survey on 04/28/2012– Toured the plant– Asked operator questions– Viewed records

S Reviewed available permits Researched information about system on state

website

Audit FindingsS Shower/Eyewash Station– Not clear of obstructions– Difficult to access in emergency

S Caustic Soda Tank– Not located in chemical room– Creates PPE issue in Filter area

S Confined Space– Decant Tank entry points not labeled as Confined Space

S Housekeeping

Audit Findings

S Operations and Maintenance Manuals– Manuals provided by Tidewater are lacking key elements– They do not include Greensand units

S Standard Operating Procedures– Not yet created

S Plant Production– Rated for 1200 gpm– Produces 540 gpm

S Decant Tank Size– Inadequate– Must be pumped every six days

Audit Findings

S Connection Discrepancy– State-6,804 connections– Tidewater-5,043 accounts

S Facility Walls– Made of plywood

S Weekly manual m-scope readings– Additional time– Possibility of contamination

S No PPE onsite

RecommendationsS Shower/eyewash Station– Tank configuration re-ordering to allow access– Change location of eyewash station

S Caustic Soda Tank– Put in chemical room– Put exclusion zone around tank

S Confined Space– Add sign to all entrances

S Housekeeping– Allocate time for organization

RecommendationsS Standard Operating Procedures– Create a book of SOP’s available for review at the facility

S Operations and Maintenance Manuals– The manuals should be revised to include information on

greensand units

S Plant Production– Missing out on production ability that you paid to receive– Possibility of future growth necessitates a solution

S Decant Tank Size– Additional tank– Expand existing tank

RecommendationsS Weekly manual m-scope readings– Permanent level reading device with chartable readings

S Connection Discrepancy– Accounts vs. Connections

S Facility Walls– Add a dehumidifier– Replace walls with fiberglass reinforced plastic walls that

were described in design specifications

S No PPE onsite– Personal protective equipment at the facility

Conclusion

Facility is in compliance with regulations

S Main issues to be addressed – Safety• Shower/eyewash station• Caustic soda tank location• Confined Space signs and SOP for sludge removal

– O&M Manuals• Need revision, and additions

THE END