Sample Typical Contaminant MCL PHG Level Found Range Violation Date Source TT = 5.0 NTU N/A 1 NTU N/A 2017 No soil runoff Turbidity TT = 95% of 93% N/A samples NTU ≤0.5 For slow sand filtration: Sample Typical Contaminant MCL PHG Found Range Violation Date Source TT = 5.0 NTU N/A 1 NTU N/A 2017 No Soil runoff Turbidity TT = 95% of 93% N/A samples NTU ≤1.0 For alternative filtration technology: Sample Typical Contaminant MCL PHG Level Found Range Violation Date Source TT = * N/A N/A 2017 Soil runoff Turbidity TT = * N/A * Refer to turbidity limits established by the State Board. Example that demonstrates reporting of lead results [section 64481(d)(2)(F)]: Example Data Lead Monitoring – Lead Action Level (90th percentile) 0.015 ppm Lead DLR 5 ppb AL in CCR units 15 ppb July 2017 Lead Results Site Site Site Site Site Site Site Site Site Site (ppb) 1 2 3 4 5 6 7 8 9 10 Lab Reported Results ND ND 8 12 9 5 ND <5 6 10 Results Converted per 0 0 8 12 9 5 0 0 6 10 section 64678(c) Note: If the lab reports a finding of or (numerical value of DLR)”, replace the finding with a “ND” “< (0) per section 64678(c). “zero” To calculate the 90th percentile: The results of all samples taken during a monitoring period shall be placed in ascending order from the sample with the lowest concentration to the sample with the highest concentration. Each sample result shall be assigned a number starting with the number 1 for the lowest value. The number of samples taken during the monitoring period shall be multiplied by 0.9. The contaminant concentration in the numbered sample yielded by this calculation is the 90th percentile. Example: July 2017 Lead Order Order Order Order Order Order Order Order Order Order Results (ppb) 1 2 3 4 5 6 7 8 9 10
Contaminant MCL PHG Level Found Range Sample Date Violation Typical Source Turbidity TT = 5.0 NTU N/A 1 NTU N/A 2017 No soil runoff TT = 95% of samples ≤0.5 NTU 93% N/A For slow sand filtration: Contaminant MCL PHG Found Range Sample Date Violation Typical Source Turbidity TT = 5.0 NTU N/A 1 NTU N/A 2017 No Soil runoff TT = 95% of samples ≤1.0 NTU 93% N/A For alternative filtration technology: Contaminant MCL PHG Level Found Range Sample Date Violation Typical Source Turbidity TT = * N/A N/A 2017 Soil runoff TT = * N/A * Refer to turbidity limits established by the State Board. Example that demonstrates reporting of lead results [section 64481(d)(2)(F)]: Example Data – Lead Monitoring Lead Action Level (90th percentile) 0.015 ppm Lead DLR 5 ppb AL in CCR units 15 ppb July 2017 Lead Results (ppb) Site 1 Site 2 Site 3 Site 4 Site 5 Site 6 Site 7 Site 8 Site 9 Site 10 Lab Reported Results ND ND 8 12 9 5 ND <5 6 10 Results Converted per section 64678(c) 0 0 8 12 9 5 0 0 6 10 Note: If the lab reports a finding of “ND” or “< (numerical value of DLR)”, replace the finding with a “zero” (0) per section 64678(c). To calculate the 90th percentile: The results of all samples taken during a monitoring period shall be placed in ascending order from the sample with the lowest concentration to the sample with the highest concentration. Each sample result shall be assigned a number starting with the number 1 for the lowest value. The number of samples taken during the monitoring period shall be multiplied by 0.9. The contaminant concentration in the numbered sample yielded by this calculation is the 90th percentile. Example: July 2017 Lead Results (ppb) Order 1 Order 2 Order 3 Order 4 Order 5 Order 6 Order 7 Order 8 Order 9 Order 10