NC0026051_Staff Comments_20000515

"PDE 5 r/h: t •
TELEPHONE RECORD
Date: 5/15/00
Time: 1315
❑ Return Mr./ Mrs. Ms. Deborah Gore
❑ Call to Address
(El Call from
Telephone: [phone]
FAX:
Subject: Reporting of quarterly averages
2 22I
Pi4lAS
Representing: Triangle WWTP
Durham County
NC0026051
Project: Same
JUL - 7 27)0
DENR - WATER (:U6di1Y
POINT SC ,CH
NOTES/ SUMMARY
Ms. Gore asked how they should be reporting Total Phosphorus data on their DMRs. Their TP limit of 0.5 mg/L
is a quarterly average; the DMR form has a line for monthly - but not quarterly - averages. In the past, they filled
in each DMR and calculated the monthly average; if they could meet the limit on a monthly basis, they clearly
met the quarterly limit. The WWTP recently switched from alum to sodium aluminate for phosphate removal, and
TP numbers ran higher than usual while they adjusted to the new operation (0.49 mg/L for the month of April).
She wanted to know how to properly report their monitoring results for phosphorus.
We discussed a couple of options, and I suggested they do the following:
1. Continue to report the individual sample results and show them on each month's DMR
2. On the final DMR for each quarter, calculate the quarterly average and enter in the "Monthly Average" box;
enter the quarterly limit in the "Monthly Limit" box. In the other two months of each quarter, continue to enter
the monthly average, but leave the "Monthly Limit" box empty.
3. At the end of each quarter, add a note to the DMR cover letter summarizing the phosphorus monitoring
results and compliance for the quarter.
NEEDED FOLLOW-UP ACTION(S)
1. Relay info to Compliance and RRO for feedback.
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Signed
cc: WO Supervisor, Raleigh Regional Office
Shannon Langley, Pt. Source Compliance & Enforcement
Mike Templeton
NPDES Unit, DWQ, Raleigh