OHA Drinking Water Services
OR41
PWS ID: 06118 ---- COLUMBIA HILLS HOA
GW/GWUDI Source Detail

Non-purchased Groundwater/GWUDI Sources:
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SRC-AA:  WELL #1
GW, Active, Seasonal ---- Operating Period: Jan 1 - Dec 31
Disinfection:  HYPOCHLORINATION, PRE ;  RESID. MAINT. HYPOCHLORINATION
Sensitivity Analysis Data
Aquifer sensitivity: Moderate   Surface water within 500 feet: No
Construction adequate?: Yes   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: Yes   Data last updated: 01/24/2013
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.
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SRC-AG:  WELL #11
GW, Active, Permanent ---- Operating Period Unknown
Disinfection:  HYPOCHLORINATION, PRE ;  RESID. MAINT. HYPOCHLORINATION
Sensitivity Analysis Data
Aquifer sensitivity: Moderate   Surface water within 500 feet: Yes
Construction adequate?: Yes   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: No   Data last updated: 07/19/2023
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.
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SRC-AH:  WELL #14
GW, Active, Permanent ---- Operating Period Unknown
Disinfection:  HYPOCHLORINATION, PRE ;  RESID. MAINT. HYPOCHLORINATION
Sensitivity Analysis Data
Aquifer sensitivity: Moderate   Surface water within 500 feet: Yes
Construction adequate?: Yes   Surface water type: Stream
E. coli sources within 2-year time-of-travel: Yes   Data last updated: 07/17/2023
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.
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SRC-AB:  WELL #7
GW, Inactive, Other ---- Operating Period: Jan 1 - Dec 31
Disinfection:  HYPOCHLORINATION, PRE ;  RESID. MAINT. HYPOCHLORINATION
Sensitivity Analysis Data
Aquifer sensitivity: Moderate   Surface water within 500 feet: No
Construction adequate?: Yes   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: Yes   Data last updated: 01/24/2013
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.
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SRC-AC:  WELL #4
GW, Inactive, Emergency ---- Operating Period Unknown
Disinfection:  HYPOCHLORINATION, PRE ;  RESID. MAINT. HYPOCHLORINATION
Sensitivity Analysis Data
Aquifer sensitivity: High   Surface water within 500 feet: No
Construction adequate?: No - Inappropriate Depth   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: Yes   Data last updated: 01/24/2013
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? Completed

Monthly Schedule (Closed): 1 sample(s) per month to be taken beginning 10/01/2012 - 09/30/2013
 JanFebMarAprMayJunJulAugSepOctNovDecTotal
# Samples
TC+
E. coli+		1
0
0		1
0
0		1
0
0		0
-
-		1
0
0		1
0
0		1
0
0		1
0
0		1
0
0		1
0
0		1
0
0		1
0
0		11
0
0
Outcome/Determination:  Low Risk
No historic GWUDI data were found.
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SRC-AD:  WELL #2
GW, Inactive, Other ---- Operating Period: Jan 1 - Dec 31
Disinfection:  HYPOCHLORINATION, PRE ;  RESID. MAINT. HYPOCHLORINATION
Sensitivity Analysis Data
Aquifer sensitivity: Moderate   Surface water within 500 feet: No
Construction adequate?: Yes   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: Yes   Data last updated: 03/18/2015
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.
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SRC-AE:  WELL #8
GW, Inactive, Emergency ---- Operating Period Unknown
Disinfection:  HYPOCHLORINATION, PRE ;  RESID. MAINT. HYPOCHLORINATION
Sensitivity Analysis Data
Aquifer sensitivity: Unknown   Surface water within 500 feet: Unknown
Construction adequate?: Unknown   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: Unknown   Data last updated:
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? Unknown
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.
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SRC-AF:  WELL #6
GW, Inactive, Seasonal ---- Operating Period Unknown
Disinfection:  HYPOCHLORINATION, PRE ;  RESID. MAINT. HYPOCHLORINATION
Sensitivity Analysis Data
Aquifer sensitivity: Unknown   Surface water within 500 feet: Unknown
Construction adequate?: Unknown   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: Unknown   Data last updated:
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? Unknown
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.
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SRC-CA:  WELL #8F1 (NOW SRC-AA IN 06211)
GW, Inactive (Disconnected), Other ---- Operating Period Unknown
Disinfection: None
Sensitivity Analysis Data
Aquifer sensitivity: Moderate   Surface water within 500 feet: No
Construction adequate?: Yes   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: No   Data last updated: 01/24/2013
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.
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