NC0026646_Instream Assessment_19800307

NPDES DOCUHENT :SCANNING COVER SHEET
NPDES Permit:
NC0026646
Pilot Mountain WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
.
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
March 7, 1980
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North Carolina Department of Natural
Resources &Community Development
Jarnes B. F111nr, .Jr , Hc;;v. rri H. Lee, Ser,retary
DIVISION OF ENVIRONMENTAL MANAGEMENT
March 7, 1980
MEMORANDUM
TO: Larry D. Coble
North Piedmont Regional Office
FROM: Forrest Westall
SUBJECT: In -Stream Assessment Pilot Mtn. Wastewater
Treatment Plant-Surry County
qv
`Df Ur \M em
2QA„cAk Uk 6(06 ctmArkA
Per your request a Level B analysis done by our office shows the following
results for the Pilot Mtn. Wastewater Treatment Plant discharge into
Heatherly Creek for 7-day I0-year low flow conditions:
For a BODu = BOD5 + 4 x (NH3-N)
= 110 mg/P + 4 x (3.34 mg/P)
= 123.36 mg/P
Flow Predicted D.O. Sag Pt. Location
MGD Min., mg/P (miles from plant)
0.60
0.61
0.62
0.63
3.58
3.57
3.55
3.54
The average BOD5 of 110 mg/P during the summer was used because the 7Q10
most likely occurs during summer months.
We believe that the projected increases in plant flow will have little
detrimental effect on D.O. concentrations in Heatherly Creek, above the
effects caused by the plant's present flow and loading. It is important to
note that present operation at the plant is very likely causing D.O. violations
at conditions less critical than 7/10 flow levels.
If you have any questions, please contact this office.
cc: Steve _uney
Ma Castleberry
nnifer Buzun
r' u.

NORTH CAROLINA DEPARTMENT OF NATURAL RESOURCES & COMMUNITY DEVELOPMENT
DIVISION OF ENVIRONMENTAL MANAGEMENT
Winston-Salem Regional Office
February 8, 1980
MEMORANDUM
TO: Mr. Forrest Westall
THRU: M. Steven Mauney -1)141
Permits & Engineering Coordinator
FROM: Larry D. Coble
Environmental Engineer
SUBJECT: In -stream Assessment
Pilot Mountain Wastewater Treatment Plant
Surry County
Due to a request for additional flow to be added to the subject wastewater
treatment plant as provided for in Senate Bill 666, we are hereby requesting
that the in -stream impact of the Pilot Mountain Wastewater Treatment Plant be
analyzed under the following conditions: (data summarized for December, 1978
through November)
A. Average Effluent Characteristics Average Yearly Plant Efficiency
Flow - 0.6 from 201 Plan
BOD5 - 105.64 mg/1 (110 mg/1 summer) 87%
TSS - 58 mg/1 Increase
NH3 as N - 3.34 mg/1 Increase
B. And for incremental flow increases of 0.01 MGD, 0.020 MGD and 0.03 MGD
with the same conditions as in A above.

Memo to Forrest Westall
February 8, 1980
Page 2
These increased flows appear to be what the city thinks will be needed
between now and the time the plant will be upgraded as outlined in the 201
Plan. This requested information is necessary in order to determine if the
flow increase will have a detrimental effect on the receiving stream. Also,
it is requested that the D.O. sag -point be calculated so that we can do some
downstream sampling.
If you have any questions or require additional information, please
advise.
cs

TOWN OF PILOT MOUNTAIN
SELF -MONITORING DATA EFFLUENT
Date BOD5mg/1
12/78 57
1/79 67
3/79 130
4/79 50
5/79 78
6/79 75
7/79 190
8/79 65
9/79 110
10/79 130
11/79 210
Yearly Average 105.64
TSS mg/1 NHias N
50 0.22
90 6.8
72
20 3.0
58 3.34
SELF -MONITORING DATA INFLUENT
BODSmg/1
TSS mg/1 NH3as N
190
203 18 3.2
160
300 28 5.2
300
260
430 41 1.0
340
380
380 36 3.4
170
Yearly Average 283 30.75 3.2

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TOWN OF PILOT MOUNTAIN
P. 0. DRAWER AA
FROM THE OFFICE OF PILOT MOUNTAIN, N. C. 27041 PHONE [phone]
Town Manager
June 28, 1979
Mr. Forrest R. Westall
Division of Environmental Management
N. C. Dept. of Natural Resources and
Community Development
P. 0. Box 27687
Raleigh, NC 27611
Re: Pilot Mountain Wastewater Land Allocation
Dear Forrest:
On October 31, 1979, the Division of Environmental
Management issued effluent limits for discharges in
the Pilot Mountain area. The results of review meetings
on the 201 Plan indicate that final limits for the dis-
charge of 1.5 MGD of wastewater at the existing site
could be altered as follows:
BODu - 71 mg/1
BOD5 - 30 mg/1
NH3-N - 10 mg/1
We request that these limits apply for our proposed
plant discharge at this site. Please contact me if
there are any questions.
Sincerely,
TOWN OF PILOT MOUNTAIN
By �►��►C.5.7
Ames E. Carter
-own Manager

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