NC0063096_Meeting Notes_20030603

NPDES DOCUHENT $CANNIN`: COVER SHEET
NC0063096
Holly Springs WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
r
Meeting Notes
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
June 3, 2003
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Davis -Martin -Powell
Holly Springs, NC
Wastewater Planning Meeting
June 3, 2003
Agenda / Discussion topics
A. Introducctions
B. Why we are here
1. NPDES Permit has been issued for 2.4 MGD Expansion
2. Town will prepare a 201 Amendment and apply for SRF funding of the next expansion
3. Town applied for a Clean Water Management Trust Fund Grant for reuse
4. Town's growth is continuing at a rapid pace
5. Town is concerned about "Flow Allocation Amounts" in the interim period
C. Flow & Performance History
1. 2001/2002 History
2. Flows show a gradual increase in flows over the last 24 months
3. Performance of WWTP has been excellent during this period
4. Inflow/Infiltration — ongoing flow logging in the system, budgeted additional money for
analysis and rehab next year.
D. Proposed Plan
1. Re -rate the WWTP for 1.75 MGD (an additional 250,000 GPD)
2. Oxidation Ditch train would provide the bulk of increased capacity to equalize aeration times
between trains
3. Planning / Design / Construction of the 2.4 MGD expansion will proceed accordingly
4. Effluent Filters and Disinfection will need upgrade when reuse is implemented
5. Town is participating in the West Wake County Regional planning effort for long-term
P:IPROJ ECT\E32261Corr\DENR_mtg.doc

HISTORICAL SUMMARY
The review of the 2001-02 DMR's provided show that in general this facility is operating very well. The
following average and peak parameters were observed:
Parameter
Flow
BOD
NH4
TSS
Influent
Effluent
Average Peak Dav Average, Peak Day
----- ----- 0.76 MGD 2.308 MGD
306 mg/L 1560 mg/L 1.0 mg/L 18 mg/L
35 mg/L 55 mg/L 0.3 mg/L 10 mg/L
408 mg/L 2306 mg/L 1.5 mg/L 59 mg/L
Despite the variations in influent BOD and TSS, percent removal of BOD, TSS, and ammonia have all
averaged over 99%. The Town is pursuing the source of the high strength wastewater being
discharged.
PRELIMINARY DESIGN
A few components will be operating above typical loading rates:
o Effluent filters loading will be 2.3 gpm/SF; slightly above the typical 2.0 gpm/SF. This is within
the general range of 2 - 6 gpm/SF, which may require more frequent backwashing.
o The UV system will operate at 38 GPM per lamp at peak flow. Normal operation will be about
15 gpm/lamp.
o The BOD loading on the aeration basins will be 22 lb/day/kft3 at a 300 mg/I influent design,
slightly exceeding the 20 Ib/day/kft3 rate for conventional activated sludge.
o Use of the PTU's second aeration basin for waste sludge storage must be discontinued,
resulting in a loss in storage volume. Timely land disposal will be critical to performance.
Preliminary Design Criteria
Component Average,
Anaerobic Zone 2.0
Oxidation Ditch Flow 1.375
Oxidation Ditch 20.0
PTU Aeration Flow 0.375
PTU Aeration 20.1
PTU Clarifiers #1, #2 347
Clarifier #3 357
Effluent Filters 2.28
Peak
0.80
347
1,039
5.70
Hours Detention
MGD
Hours Detention
MGD
Hours Detention
Surface Loading, GPD/SF
Surface Loading, GPD/SF
Surface Loading, gpm/SF

Town of Holly Springs
2.50 -
2.25
2.00
1.75
1.50
O • 1.25
5
1.00 -
0.75
0.50
0.25
0.00
C
co
Utley Creek WWTP
Flow Summary
—Avg Flow
- Min Flow
—�--Max Flow
Flow Limit
— — Flow Trend
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Month
Davis -Martin -Powell & Associates

Town of Holly Springs
16.00
14.00
12.00
10.00
0 8.00
2
6.00
4.00
2.00
0.00
Utley Creek WWTP
Effluent Ammonia
❑ Max Flow
■Avg NH4
♦ Max NH4
♦
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Month
Davis -Martin -Powell & Associates

Town of Holly Springs
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40.00
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20.00
10.00
0.00
Utley Creek WWTP
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Davis -Martin -Powell & Associates

2.4 MGD Expansion
Technical 201 Amendment
CG&L Approval
Final Design
Review & Approval
Bidding
Construction
dmp 1 holly-schedule.xls
Town of Holly Springs
2.4 MGD WWTP Expansion
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