19970722 Ver 1_More Info Received_19980512

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PIEDMONT
TRIAD REGIONAL
WATER
MAY 1 21996
AUTHORITY
May 6, 1998
John Dorney
NC-DWQ - Wetlands/401 Group
4401 Reedy Creek Road
Raleigh, NC 27607
Re: Randleman Lake Potential Wetland Mitigation Sites
Dear Mr. Dorney:
r
NlETLANDS !;KW
I am writing in response to your April 24, 1998, letter regarding the Randleman Lake
Compensatory Mitigation Proposal. The PTRWA is pleased that our design approach for the
four primary sites was approved by your office. This "environmentally and economically sound
approach" is foremost in our minds as we continue to search for additional mitigation sites
within the Randleman Lake watershed.
This brings me to your statement, from the above referenced letter, that "the Authority has not
chosen to look for additional wetland mitigation sites". This is simply untrue. The PTRWA has
not stopped looking for appropriate sites since the first mitigation plan was presented in 1996.
An initial list of nine potential wetland mitigation sites was developed based on numerous visits
to the area by representatives from the PTRWA and DWQ. Based on additional site visits by
representatives from DWQ, four of those initial sites were eliminated as potential mitigation
sites. The PTRWA then began an in-depth evaluation of the most promising of the remaining
sites (Richland, Hickory, Muddy, and Reddicks Creeks). During this time, we also continued to
look for additional mitigation sites.
As a result of our continued study of the area, the Authority has identified three new potential
wetland mitigation sites in the watershed and has returned to four of the original nine sites for
re-evaluation. With the understanding that further study of these sites could eliminate them as
wetland mitigation sites, the PTRWA welcomes recommendations from your office as to the
specific locations of additional wetland mitigation sites within Randleman Lake watershed.
I plan on scheduling with your office a site visit of the seven potential wetland mitigation sites
identified by the PTRWA as well as any sites DWQ recommends. I will call you next week to
establish the details of this visit.
Wilmington Building, Suite 207 • 2216 West Meadowview Road • Greensboro, North Carolina 27407-3480
Telephone: [phone] • FAX: [phone]
M 7'
If you need any additional information, please call me at [phone].
Sincerely, V? . Ca
40v,
Andrea M. Spangler
Environmental and Special Projects Manager
cc: Pete Colwell, DWQ Central Office
Ron Linville, DWQ Regional Office
Ed Powell, Davis Martin Powell, Assoc.
Jerry McCrain, EcoScience Corporation
Lang Zucchino, Patton/Zucchino and Associates
John Kime, PTRWA
, 41
RANDLEMAN RESERVOIR LOADING SCENARIOS
?n,
f + H
f.
ADING CONDITION TP Load to Deep River 1* Predicted Chl a Predicted Violations
r (kg/yr - avg flow yr) (growing season avg) (% season > 40 ug/1)
Load Conditions
lExisting
Upstream Load 7,050
Direct Non Point Source Load 5,570
High Pt. Eastside WWTP Load 58,070
(10.5 MGD & TP = 4.0 mg/1)
Total Phosphorus Load 70,690 95 89.0%

2. Furure Load with Watershed Management Plan from Piedmont Triad Regional Water Authority
Upstream Load 12,690
Direct Non Point Source Load 8,110
High Pt. Eastside WWTP Load 7,190
(26 MGD & TP = 0.2 mg/1)
Total Phosphorus Load 27,990 67 73.3%
3. Estimated Load from Tetra Tech Modeling necessary to reduce chlorophyl a violations to 50%
Upstream Load 6,453
Direct Non Point Source Load 0
High Pt. Eastside WWTP Load 7,190
(26 MGD & TP = 0.2 mg/1)
Total Phosphorus Load 13,643 46 50.0/0

Future Permitted Load from WWTP 17,975
(26 MGD & TP = 0.5 mg/1)

4. Future Load with PTRWA Watershed Management Plan and no WWTP discharge to reservoir
Upstream Load 12,690
Direct Non Point Source Load 8,110
High Pt. Eastside WWTP Load 0
(discharge removed)
Total Phosphorus Load 20,800 46 48.0%
5. Existing Load Conditions with no WWTP discharge
Upstream Load 7,050
Direct Non Point Source Load 5,570
High Pt. Eastside WWTP Load 0
(discharge removed)
Total Phosphorus Load 12,620 39 38.0%
Deep River I is the modeling segment of the reservoir that recieves the wastewater discharge from the High Pt. Eastside
WWTP and is predicted to sustain the most severe and frequent water quality violations for chlorophyl a.
? A10- Draft (February 1998) Section ? - Nutrient Reduction Goals and Objectives

Figure 3. Randleman Lake Watershed Model Segmentation
Piedmont Triad Regional Water Authority 2-3

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