NC0020354_Headworks Analysis_20020626

OF W ATFL Michael F. Easley
Governor
Uj r William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
p Alan W. Klimek, P.E., Director
Division of Water Quality
June 26, 2002
MR. HUGH MONTGOMERY
TOWN MANAGER
TOWN OF PITTSBORO
PO BOX 759
PITTSBORO NC 27312
Subject: Pretreatment Unit Review of Headworks Analysis (HWA)
Town of Pittsboro (NPDES # NC0020354)
Chatham County
Dear Mr. Montgomery:
The Pretreatment Unit of the Division of Water Quality has reviewed the Headworks Analysis (HWA) for
the Town of Pittsboro. This HWA was received by the Division on April 23, 2001.
The HWA submission addressed revisions for BOD, NH3, and Phosphorus. We regret the extreme delay
in providing you our review comments. Indeed, the POTW has an upcoming August 1, 2002, due date
for submittal of an updated HWA based on recent collection of Short Term Monitoring Plan (STMP)
data. Therefore, rather than approving or disapproving the April 2001 submission, we are offering
comments for your consideration as you prepare this new HWA for submission:
Phosphorus: The April 2001 HWA submission for phosphorus did provide a discussion of phosphorus
treatment at the WWTP, but did not provide a specific allowable load based on a specific Design influent
criteria to use to develop a Design Maximum Allowable Headworks Loading (MARL). If the Town
wishes to pursue development of an MAHL based on Design, additional information must be provided on
the actual capacity.
BOD and NH3: The April 2001 HWA submission, with the February 2001 letter from Diehl and Phillips,
the POTW's engineers, included development of a BOD MAHL of 1514 lbs/day based on a Design
Criteria of 242 mg/l influent BOD. Likewise, the submission included development of a NH3 as N
MARL of 219 lbs/day based on a Design criteria of 35 mg/1 NH3 as N. If you wish to continue with your
request for approval of this 1VIAHL, please state this in the submission of your next HWA, due August 1,
2002, including a synopsis of the criteria and calculations.
Thank you for your continued cooperation with the Pretreatment Program requirements. If you have any
questions or comments, please contact me at [phone] (ext. 523) [email: [e-mail]],
or Tom S. Poe (ext. 522), Supervisor of the Pretreatment Unit.
drf/pittsborohwa.004
cc: Mr. John Poteat, Town of Pittsboro
Mr. Perry Dunn, Town of Pittsboro
Central_Ezies
DRF, Pretreatment Unit
Myrl Nisely, Raleigh Regional Office
NC—DENR, DWQ, PRETREATMENT UNIT
1617 MAIL SERVICE CENTER, RALEIGH, NC 27699-1617
Website: http://h2o.enr.state.ne.us/Pretreat/index.html
Sincerely,
Drx� r&e4 �v
Dana Rees Folley
Pretreatment Staff
*Mw
Telephone: [phone] Fax: [phone] NCDENR
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