SUMMARY TABLE OF QUARTERLY SAMPLING
RESULTS FOR CALENDAR YEAR 2023
PFHxS Results in Ground Water Sources
1 The well for which the sample exceeded the response level was immediately taken out of service and remained out of service until DDW approved our PFHxS blending plan. 2 The well was placed out of service in February due to mechanical issues and it has been repaired and placed back in operation in August.
ND: Non-detect
Well
Number
Notification
Level
Response
Level
Jan- March
Results
April – June
Results
July- Sept
Results
VO-1 >3 ng/L >20 ng/L 2.1 4.9 4.9
VO-2 >3 ng/L >20 ng/L ND ND ND
VO-3 >3 ng/L >20 ng/L 5.4 ND 6.0
VO-4 >3 ng/L >20 ng/L 3.9 7.9 12
VO-5 >3 ng/L >20 ng/L 20 23 Off-line1
VO-6 >3 ng/L >20 ng/L 5.5 9.4 9.1
VO-7 >3 ng/L >20 ng/L Off-line 2 Off-line 2 5.6
VO-8 >3 ng/L >20 ng/L ND 4.6 4.1
ATTACHMENT 5
A5-1
PFOA Results in Ground Water Sources
1 Notification of exceedance provided to City Council (Attachment 1) 2 The well for which the sample exceeded the response level for PFHxS was immediately taken out of service and remained out of service until DDW approved our PFHxS blending plan 3 The well was placed out of service in February due to mechanical issues and it has been repaired and placed back in operation in August.
ND: Non-detect
Well
Number
Notification
Level
Response
Level
Jan - March
Results
April – June
Results
July- Sept
Results
VO-1 >5.1 ng/L >10 ng/L ND ND ND
VO-2 >5.1 ng/L >10 ng/L ND ND ND
VO-3 >5.1 ng/L >10 ng/L ND ND 2.3
VO-4 >5.1 ng/L >10 ng/L ND ND ND
VO-5 >5.1 ng/L >10 ng/L 5.31 4.9 Off-line 2
VO-6 >5.1 ng/L >10 ng/L 3.1 2.4 2.5
VO-7 >5.1 ng/L >10 ng/L Off-line 3 Off-line 3 2.8
VO-8 >5.1 ng/L >10 ng/L ND ND ND
ATTACHMENT 5
A5-2