OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00055
Who Was Contacted and Phone: Gary McLauchlin (503) 325-3524
Contact Date: 05/19/2009
Contacted By: HOFELD, EVAN (REGION 1)
Contact Method/Location: Office
Reasons: Disinfection Byproducts
Details: SUMMARY: Questions about DBP Stage 2 DETAILS: Gary McLauchlin called about questions regarding reporting requirements for IDSE monitoring. I directed him to Wendy Marshall (EPA) who stated that when Stage 2 compliance monitoring begins, compliance will be based on a locational running annual average (LRAA) after collecting four quarters of samples. If the HAA5 (or TTHM) LRAA is greater than 0.060 ppm, public notification would be required. Earlier notification may be required if the LRAA exceeds the MCL based on fewer than four quarters regardless of the monitoring results of subsequent quarters (e.g. one results more than 4x the MCL will not be be offset by 3 subseqent non-detect results). IDSE standard monitoring sites are not compliance monitoring sites, so public notification is not required now or after the four quarterly samples are collected. However, under the CCR regulations individual sample results for the IDSE are to be included when reporting the range of TTHM and HAA5 results in the annual CCR. So, whatever the highest HAA5 (or TTHM) result you find during 2009, whether it is at your Stage 1 site or at one of the IDSE sites, that result must be reported in the 2009 CCR. ACTION NEEDED: Include IDSE results when determining the range of TTHM and HAA5 results for reporting in the annual CCR.

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