NC0073741_Wasteload Allocation_19930429

NPDES DOCUI4ENT SCANNING COVER SHEET
NPDES Permit:
NC0073741 ,/ our- m V4://e
Subdivision
Document Type:
Permit Issuance
i
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
April 29, 1993
This locum iit is pri=ited oa reuse paper - ignore airy
coate=it on the reYerse side

PERMIT NO.: NC0073741
PERM11'1'LE NAME: Hydrologic, Inc.
FACILITY NAME: Mountain Valley Subdivision
Facility Status: Existing
Permit Status: Renewal
Major
NPDES WASTE LOAD ALLOCATION
Pipe No.: 001
Minor
Design Capacity: 0.04 MGD
Domestic (% of Flow): 100
Industrial (% of Flow):
Comments:
refer: Basinwide / Streamline WLA file
at front of subbasin
RECEIVING STREAM: French Broad River
Class: C
Sub -Basin: 04-03-02
Reference USGS Quad: F8SE
County: Henderson
Regional Office: Asheville Regional Office
Previous Exp. Date: 7/29/93 Treatment Plant Class: II?
Classification changes within three miles:
(please attach)
2-16- /3
Requested by: Susan Robson Date: 12/30/92-
Prepared by: 4/, 4auAte_ Date: OC./q,3
1 / I
Reviewed ( L� >JQi' 2/_/ Date: `-I j/94 I)
�L o b �l �3
Modeler
Date Rec.
#
.3-44A/
,21i6 /93
733 el
Drainage Area (mi2 ) 3/ 9
7Q10 (cfs) d1c
Avg. Streamflow (cfs): f01,6
Winter 7Q10 (cfs) 2 77 30Q2 (cfs) g/ 7
Toxicity Limits: 1WC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
rr=
0,o2.0Akie,
o.aro MG.O
Effluent
Characteristics
Summer
Winter
BOD5 (mg/1)
.3J (et)
NH3-N (mg/1)
0/0//
D.O. (mg/1)
4,-
TSS (mg/1)
3 o
F. Col. (/100 ml)
h,,-
pH (SU)
h/
:N
U
.. k
ipLu
i
BOO
Comments:

•M
2/7
1 ROAD
t :-
•
4.� a mnSin
/1j
eu.h�,

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WAS 1'ELOAD ALLOCATION
Request # 7339
Hydrologic -Mountain Valley Subdivision
NC0073741
Domestic - 100%
Existing
Renewal
French Broad River
C
040302
Henderson
ARO
Robson
2/16/93
F8SE
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
318
226
277
1046
417
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Facility requesting renewal of existing NPDES permit. ARO indicates that only 50% of permitted
flow has been constructed and plant currently averages 1600 gpd of flow. They request that
Hydrologic provide justification of the need for the additional 20,000 gpd permitted to them.
Model results indicate that secondary limits would protect at both flows.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by;
Reviewed by
Instream Assessment:
Regional Supor:
Permits & Engineering:
Date: q/ 1l 3
Date: Lf-1I G/ %3
Date: 0
RETURN TO TECHNICAL SERVICES BY: MAY 1 1993
. r----1
APR 141993
WATER QUALITY SECTION
ASHEVILL RFGIONAI f1FFICF
IMMO

2
Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Temperature (C):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 mi):
pH (SU):
Temperature (C):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Limits Changes Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures
New facility information
0.020
30
monitor
nr
30
nr
nr
monitor
CONVENTIONAL PARAMETERS
Monthly Average
Summer Winter
0.040
30
monitor
nr
30
nr
nr
monitor
Monthly Average Monthly Average
WQ or EL WQ or EL
0.040
EL 30 EL
monitor
nr
EL 30 EL
nr
nr
monitor
Parameter(s) Affected
Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
N No parameters are water quality limited, but this discharge may affect future allocations.

3
INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No t)(/ NU L /44(7S C AVGC.
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

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HYDROLOGIC- MT. VALLEY
HYDROLOGIC -MT. VALLEY SUBD.
Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/l)
Fecal Limit
(based on 331 : 1)
226
0.02
0.031
17.0
0
0.01
123952.48
Not Required
Ammonia as NH3
(summer)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
Ammonia as NH3
(winter)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
226
0.02
0.031
1.0
0.22
0.01
5687.45
226
0.02
0.031
1.8
0.22
0.01
11520.51
4/5/93

HYDROLOGIC- MT. VALLEY
HYDROLOGIC -MT. VALLEY SUBD.
Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/l)
Fecal Limit
(based on 331 : 1)
226
0.04
0.062
17.0
0
0.03
61984.74
Not Required
Ammonia as NH3
(summer)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/l)
Ammonia as NH3
(winter)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
226
0.04
0.062
1.0
0.22
0.03
2844.23
226
0.04
0.062
1.8
0.22
0.03
5761.15
4/5/93