NC0026921_Effluent Toxicity_20110428

Lopez, Dale
From: Lopez, Dale
Sent: Monday, February 07, 2011 5:02 PM
To: Henson, Belinda; Rawls, Paul; Brantley, Mark; Allen, Trent; White, Hughie; Lawyer, Mike;
Danny Strickland
Cc: Lopez, Dale
Subject: Parkton's Whole Effluent Toxicity for January 2011
The January 2011 WET resulted in a "fail" due to reproduction. Terry Wages doesn't know what might have caused the
failure. He will set up Multiple Dilution WET testing for February and March 2011.
1

Lopez, Dale
From: Lopez, Dale
Sent: Monday, March 07, 2011 2:52 PM
To: Lopez, Dale; Henson, Belinda; Rawls, Paul; Brantley, Mark; Allen, Trent; White, Hughie;
Lawyer, Mike; Danny Strickland
Subject: RE: Parkton's Whole Effluent Toxicity for January 2011
Parkton failed at 31.8% in February with the multiple dilution method. Terry Wages now thinks that the failures were
due to the MISS being too low (1,250 mg/L). He wasted too much.
From: Lopez, Dale
Sent: Wednesday, February 09, 2011 11:42 AM
To: Henson, Belinda; Rawls, Paul; Brantley, Mark; Allen, Trent; White, Hughie; Lawyer, Mike; Danny Strickland
Cc: Lopez, Dale
Subject: FW: Parkton's Whole Effluent Toxicity for January 2011
I phoned Terry Wages today to question him about what might have caused the January "Fail" for the Whole Effluent
Toxicity, because earlier, he said that he didn't have any idea what could have done it. These are some potential causes
that he told me were occurring during the WET sampling week: the ammonia was between 5 and 6 mg/L, there was
increased flow due to l&I (snow & ice melt --- any unusual runoff from road salt), he was decanting the aerobic digester
during that week. The effluent was showing chlorines of about 20 micrograms/L during that week (so I don't think he
was over-dechlorinating with the Norwalk tablets). Terry is doing the multiple dilution' WET this week, and he'll let me
know the results.
From: Lopez, Dale
Sent: Monday, February 07, 2011 5:02 PM
To: Henson, Belinda; Rawls, Paul; Brantley, Mark; Allen, Trent; White, Hughie; Lawyer, Mike; Danny Strickland
Cc: Lopez, Dale
Subject: Parkton's Whole Effluent Toxicity for January 2011
The January 2011 WET resulted in a "fail" due to reproduction. Terry Wages doesn't know what might have caused the
failure. He will set up Multiple Dilution WET testing for February and March 2011.
1

Lopez, Dale
From: Lopez, Dale
Sent: Thursday, April 28, 2011 4:03 PM
To: Henson, Belinda
Cc: Lopez, Dale
Subject: RE: Parkton's Whole Effluent Toxicity for January 2011
Presently the flow paced part of the chlorine gas feed is not working (it stopped working sometime last year), so Terry is
making adjustments. Terry plans to get it fixed when he has the money to do so. They are still using the dechlor
tablets. All of the "fail" WETs had <0.1 mg/L chlorine (performed by Meritech). Terry Wages' chlorine results, for
January and February's DMRs, ranged from <15 to 27 ug/L. I thought that they were over-dechlorinating, but then I saw
on their DMRs that there were several chlorine results that were above Parkton's minimum reporting level of 15 ug/L.
From: Henson, Belinda
Sent: Thursday, April 28, 2011 3:41 PM
To: Lopez, Dale
Subject: RE: Parkton's Whole Effluent Toxicity for January 2011
Dale,
Could chlorine possibly be the culprit of the Tox failures? Historically that has been an issue with those chlorine tablets.
Thanks.
Belinda
From: Lopez, Dale
Sent: Thursday, April 28, 2011 3:11 PM
To: Lopez, Dale; Henson, Belinda; Rawls, Paul; Brantley, Mark; Allen, Trent; White, Hughie; Lawyer, Mike; Danny
Strickland
Subject: RE: Parkton's Whole Effluent Toxicity for January 2011
Parkton's April 2011 sample resulted in another "Fail" for the WET. Since their first failure in January 2011, their other
failed WETs are: February = 31.8%, March = 82.2%, April = "Fail". Parkton's NPDES limit dilution is 90%. The April failure
had reduced reproduction with two mortalities in the test samples. The cause for the failures hasn't yet been
determined. During the whole month of March 2011, the ammonia results ranged between 0.1 and < 0.1 mg/L, which
indicated that ammonia wasn't the toxicant. But during the months of October 2010 thru March 31, 2011, they ranged
from 0.3 to 8.4 mg/L, and ammonia might have contributed to the toxicity. On April 8th, the Copper was 7.95 ug/L, and
the Zinc was 36.5 ug/L
From: Lopez, Dale
Sent: Monday, March 07, 2011 2:52 PM
To: Lopez, Dale; Henson, Belinda; Rawls, Paul; Brantley, Mark; Allen, Trent; White, Hughie; Lawyer, Mike; Danny
Strickland
Subject: RE: Parkton's Whole Effluent Toxicity for January 2011
Parkton failed at 31.8% in February with the multiple dilution method. Terry Wages now thinks that the failures were
due to the MLSS being too low (1,250 mg/L). He wasted too much.
From: Lopez, Dale
Sent: Wednesday, February 09, 2011 11:42 AM
To: Henson, Belinda; Rawls, Paul; Brantley, Mark; Allen, Trent; White, Hughie; Lawyer, Mike; Danny Strickland
1

Cc: Lopez, Dale
Subject: FW: Parkton's Whole Effluent Toxicity for January 2011
1 phoned Terry Wages today to question him about what might have caused the January "Fail" for the Whole Effluent
Toxicity, because earlier, he said that he didn't have any idea what could have done it. These are some potential causes
that he told me were occurring during the WET sampling week: the ammonia was between 5 and 6 mg/L, there was _
increased flow due to I&I (snow & ice melt --- any unusual runoff from road salt), he was decanting the aerobic digester
during that week. The effluent was showing chlorines of about 20 micrograms/L during that week (so 1 don't think he
was over-dechlorinating with the Norwalk tablets). Terry is doing the multiple dilution WET this week, and he'll let me
know the results.
From: Lopez, Dale
Sent: Monday, February 07, 2011 5:02 PM
To: Henson, Belinda; Rawls, Paul; Brantley, Mark; Allen, Trent; White, Hughie; Lawyer, Mike; Danny Strickland
Cc: Lopez, Dale
Subject: Parkton's Whole Effluent Toxicity for January 2011
The January 2011 WET resulted in a "fail" due to reproduction. Terry Wages doesn't know what might have caused the
failure. He will set up Multiple Dilution WET testing for February and March 2011.
2