Presented By: Fred J. Sánchez Water Quality Operations Supervisor
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1 Presented By: Fred J. Sánchez Water Quality Operations Supervisor
2 CDPHE Suspected Salmonella in Alamosa s Drinking Water Supply CDPHE & Denver Water Developed a Strategy: Water Distribution Operations Team Water Quality Monitoring/Testing Team Initial Reservoir Inspections Disinfection Method Flushing & Dechlorination Method Cross-Connection Survey CDPHE Requirements
3 Water Is Suspected by CDPHE No Common Food Source No source of contamination or initial location of Infection confirmed Confirmed Infant Infections
4 Salmonella bacteria are rod-shaped, flagellated, Gram stain-negative and are known to cause disease in humans, animals, and birds (especially poultry) worldwide. Salmonellosis is spread to people by ingestion of Salmonella bacteria that contaminate food & water.
5 Organize A Distribution Team Plan For Chlorinating & Flushing Chlorine Dose Injection Method Distribution Sectors Dechlorination Method CDPHE Samples For Salmonella Meet & Inspect Sites With Local Officials
6 Develop a strategy
7 City of Alamosa Denver Water CDPHE Colorado Rural Water Association Aurora Water Pueblo Boulder Nebraska East Cherry Creek Valley
8 Distribution Operations & CDPHE
9
10 Distribution System Craft Tower Ross Tower Weber Reservoir
11 Population: Under 10,000 Water Source: 6 Wells 1 Active During Winter Months Up to 4 During Summer Months Distribution System: 50 miles Pipe Diameter: 4-16 Pipe Type: CA, CI & PVC Average Water Temp: 75º Deep Confined Aquifer State Requirements: Chlorination Waiver Collect 10 Total Coliform Samples per Month Alternating Between Source & Distribution System Sites
12 Craft Tower Gallons: 500,000 Type: Elevated Storage Tank (Pedestal Spheroid) Condition: Good Ross Tower Gallons: 200,000 Type: Elevated Storage Tank (Standpipe) Condition: Good Weber Reservoir Gallons: 300,000 Type: Ground-level Service Storage Reservoir Condition: Poor; reservoir has noticeable cracks, etc.
13 Pittsburg Tank & Tower Inspection
14 Inspection Revealed: No Major Structural Damage Minor Structural Repair Recommended No Potential Environmental Contamination
15 Rust on Interior Roof
16 Bird Fecal Matter on Exterior Roof
17 Overflow Pipe in Good Condition
18 Cleanout Hatch Good Condition
19 Pittsburg Tank & Tower Inspection
20 Inspection Revealed: No Major Structural Damage Minor Structural Repairs Recommended Possible Environmental Contamination
21 Roof Manway Replacement
22 Weld Steel Plates Over Holes
23 Interior View of Holes
24 Denver Water & CDPHE Inspection
25 Structural Damage Potential Environmental Contamination Sand accumulation in Reservoir
26 E X T E R N A L
27 Before Repair After Repair Weber Reservoir External Problems
28 Before Repair After Repair Weber Reservoir External Problems
29 Before Repair After Repair Weber Reservoir External Problems
30 I N T E R N A L
31 Internal Sand Removal
32 Weber Spray Disinfection 100 mg/l
33 Weber Reservoir Checklist Reservoir Drained & Cleaned All Holes Patched Spray 100 mg/l Calcium Hypochlorite 12-hr disinfection contact time Selected as Super Chlorination Source 300,000 gallons at 25 mg/l Craft Tower Ross Tower 50 miles of Distribution System
34 DISINFECTION METHOD FRED J. SANCHEZ
35
36 3 Chlorination Sectors Established: Sector 1 Sector 2 Sector 3
37 Alamosa Chlorination Process Sector I 25 mg/l Sector II Sector III
38 FIRE HYDRANT
39 Fire Hose To Trailer
40 Fire Hose To Chlorine Injection
41 Chlorine Injection Point
42 Weber Well Discharge Pipe
43 Weber Reservoir Aeration Pipe
44 Disinfection (Injector) Metering Skid/ Chemical Feeder Borrowed from Alamosa s Treatment Plant
45 Flushing & Dechlorination
46
47
48 Dechlorination Tank Drip Method
49
50 PUBLIC SAFETY & COMMUNITY SUPPORT
51 3 Letters Are Hand Delivered to the Public Red -Flushing at 25 mg/l (March 25 th -28 th ) Do Not Drink! Do Not Prepare Food Do Not Bathe/Shower Toilet Use Only! Yellow -Flushing at 2mg/L (March 29 th 1 st ) Do Not Drink! Do Not Prepare Food Showering Allowed No Babies or Sr. Citizens Toilet Use Allowed Green -Water Is Safe To Drink (April 11 th ) If CDPHE Requirements Are Met: No Salmonella No Crypto No Giardia Radio & Television Also Issue Alerts!
52
53
54 Emergency Water Supplied: Bottled Water Potable Water Trucks Water Used For: Consumption Showering Allows Chlorination Efforts To Continue Begins With 25 mg/l Dose
55
56 CROSS-CONNECTION CONTROL
57 Over 100 Facilities Surveyed For: Direct Cross-Connections Backflow Prevention Hazards Divided: Extreme Must be fixed immediately! Includes: Mortuaries, Car Washes, Dry Cleaners, Meat Packing Plants High Low Priority For Inclusion into CCC Program Includes: Restaurants, Gas Stations, etc. Eventual Inclusion into CCC Program Includes: Retail Stores, Office Buildings, etc.
58 Direct Cross-Connection Water Heater
59 Direct Cross-Connection Ice Maker
60 Sanitary Sewer Truck Direct Cross-Connection
61 CDPHE REQUIREMENTS
62 Take Weber Reservoir Off-line Maintain 2mg/L Chlorine Residual In the DS and in the Reservoirs No Total Coliform & Salmonella Positive Samples Contain All Extreme Hazard Cross-Connections Test For Crypto and Giardia
63 Distribution System Monitoring Plan Developed 20 DS Sample Sites Input Sites in GIS (CO Rural Water Association) Develop an Ongoing Cross-Connection Control Program Commercial Containment Residential Well Containment
64 Commercial Containment Basic Program Tracking Installation Notification Annual Testing Surveys Residential Containment Wells Commercial & Residential Isolation Educational Campaign Cross-Connection Control Program
65
66
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