SW1221003_Design Calculations_20230314

Appendix 2
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ion
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Advanced Drainage Systems, Inc.
Mills River Townhornes BMP #1
Mills River- NC
BAYSAVER BAYFILTER SPECIFICATIONS
PRODUCTS
A. INTERNAL COMPONENTS: ALL COMPONENTS INCLUDING CONCRETE STRUCTURE(S), PVC MANIFOLD PIPING AND FILTER CARTRIDGES,
SHALL BE PROVIDED BY BAYSAVER TECHNOLOGIES LLC, 1030 DEER HOLLOW DRIVE, MOUNTAIRY, MD (800.229.7283).
B. PVC MANIFOLD PIPING: ALL INTERNAL PVC PIPE AND FITTINGS SHALL MEET ASTM D1785. MANIFOLD PIPING SHALL BE PROVIDED TO THE
CONTRACTOR PARTIALLY PRE-CUTAND PRE -ASSEMBLED.
C. FILTER CARTRIDGES: EXTERNAL SHELL OF THE FILTER CARTRIDGES SHALL BE SUBSTANTIALLY CONSTRUCTED OF POLYETHYLENE OR
EQUIVALENT MATERIAL ACCEPTABLE TO THE MANUFACTURER. FILTRATION MEDIA SHALL BE ARRANGED IN A SPIRAL LAYERED FASHION
TO MAXIMIZE AVAILABLE FILTRATION AREA. AN ORIFICE PLATE SHALL BE SUPPLIED WITH EACH CARTRIDGE TO RESTRICT THE FLOW RATE
TOAMAXIMUM OF45GPM.
D. FILTER MEDIA: FILTER MEDIA SHALL BE BY BAYSAVER TECHNOLOGIES LLC AND SHALL CONSIST OF THE FOLLOWING MIX: A BLEND OF
ZEOLITE, PERLITE AND ACTIVATED ALUMINA.
E. PRECAST CONCRETE VAULT: CONCRETE STRUCTURES SHALL BE PROVIDED ACCORDING TO ASTM C. THE MATERIALS AND STRUCTURAL
DESIGN OF THE DEVICES SHALL BE PER ASTM C478, C857 AND C858. PRECAST CONCRETE SHALL BE PROVIDED BY BAYSAVER
TECHNOLOGIES, LLC.
PERFORMANCE
A. THE STORMWATER FILTER SYSTEM SHALL BEAN OFFLINE DESIGN CAPABLE OFTREATING 100%OFTHE REQUIRED TREATMENT FLOWAT
FULLSEDIMENT LOAD CONDITIONS.
B. THE STORMWATER FILTER SYSTEM'S CARTRIDGES SHALL HAVE NO MOVING PARTS.
C. THE STORMWATER TREATMENT UNIT SHALL BE DESIGNED TO REMOVE AT LEAST 85% OF SUSPENDED SOLIDS, 65% OF TOTAL
PHOSPHORUS, 65% OF TURBIDITY, 40% OFTOTAL COPPER, AND 40% OF TOTAL ZINC BASED ON FIELD DATA COLLECTED IN COMPLIANCE
WITH THE TECHNOLOGY ACCEPTANCE RECIPROCITY PARTNERSHIPTIER IITEST PROTOCOL.
D. THE STORMWATER FILTRATION SYSTEM SHALL REDUCE INCOMING TURBIDITY (MEASURED AS NTUs) BY 50% OR MOREAND SHALL NOT
HAVE ANY COMPONENTS THAT LEACH NITRATES OR PHOSPHATES.
E. THE STORMWATER FILTRATION CARTRIDGE SHALL BE EQUIPPED WITH A HYDRODYNAMIC BACKWASH MECHANISM TO EXTEND THE
FILTER'S LIFEAND OPTIMIZE ITS PERFORMANCE.
F. THE STORMWATER FILTRATION SYSTEM SHALL BE DESIGNED TO REMOVE A MINIMUM OF 65% OFTHE INCOMING TOTAL PHOSPHORUS
(TP) LOAD.
G. THE STORMWATER FILTRATION SYSTEM'S CARTRIDGES SHALL HAVE A TREATED SEDIMENT CAPACITY FOR 80%TSS REMOVAL BETWEEN
150-350LBS.
BAYFILTER MAINTENANCE
THE BAYFILTER SYSTEM REQUIRES PERIODIC MAINTENANCE TO CONTINUE OPERATING AT ITS PEAK EFFICIENCY DESIGN. THE MAINTENANCE
PROCESS COMPRISES THE REMOVAL AND REPLACEMENT OF EACH BAYFILTER CARTRIDGE AND THE CLEANING OF THE VAULT OR MANHOLE WITH A
VACUUM TRUCK. FOR BEST RESULTS, BAYFILTER MAINTENANCE SHOULD BE PERFORMED BY A CERTIFIED MAINTENANCE CONTRACTOR. A QUICK
CALL TO AN ADS ENGINEER OR CUSTOMER SERVICE REPRESENTATIVE WILL PROVIDE YOU WITH A LIST OF RELIABLE CONTRACTORS IN YOUR AREA.
WHEN BAYFILTER IS INITIALLY INSTALLED, WE RECOMMEND THAT AN INSPECTION BE PERFORMED ON THE SYSTEM IN THE FIRST SIX (6) MONTHS.
AFTER THAT, THE INSPECTION CYCLE TYPICALLY FALLS INTO A BIANNUAL PATTERN GIVEN NORMAL STORM OCCURRENCE AND ACTUAL SOLIDS
LOADS.
WHEN BAYFILTER EXHIBITS FLOWS BELOW DESIGN LEVELS, THE SYSTEM SHOULD BE INSPECTED AND MAINTAINED AS SOON AS PRACTICAL.
REPLACING A BAYFILTER CARTRIDGE SHOULD BE CONSIDERED AT ORABOVE THE LEVEL OF THE MANIFOLD.
MAINTENANCE PROCEDURES
1. REMOVE THE MANHOLE COVERS AND OPEN ALLACCESS HATCHES.
2. BEFORE ENTERING THE SYSTEM MAKE SURE THE AIR IS SAFE PER OSHA STANDARDS OR USE BREATHING APPARATUS. USE LOW 02, HIGH
CO, OR OTHER APPLICABLE WARNING DEVICES PER REGULATORY REQUIREMENTS.
3. USING A VACUUM TRUCK, REMOVE ANY LIQUID AND SEDIMENTS THAT CAN BE REMOVED PRIOR TO ENTRY.
4. USING A SMALL LIFT OR THE BOOM OF THE VACUUM TRUCK, REMOVE THE USED CARTRIDGES BY LIFTING THEM OUT.
5. ANY CARTRIDGES THAT CANNOT BE READILY LIFTED CAN BE EASILY SLID ALONG THE FLOOR TO A LOCATION THEY CAN BE LIFTED VIA BOOM
LIFT.
6. WHEN ALL THE CARTRIDGES HAVE BEEN REMOVED, IT IS NOW PRACTICAL TO REMOVE THE BALANCE OF THE SOLIDS AND WATER. LOOSEN THE
STAINLESS CLAMPS ON THE FERNCO COUPLINGS FOR THE MANIFOLD AND REMOVE THE DRAINPIPES AS WELL. CAREFULLY CAP THE MANIFOLD
AND THE FERNCO'S AND RINSE THE FLOOR, WASHING AWAY THE BALANCE OFANY REMAINING COLLECTED SOLIDS.
7. CLEAN THE MANIFOLD PIPES, INSPECT, AND REINSTALL.
8. INSTALLTHE EXCHANGE CARTRIDGES AND CLOSE ALL COVERS.
9. THE USED CARTRIDGES MUST BE SENT BACK TO ADS FOR EXCHANGE/RECYCLING AND CREDIT ON UNDAMAGED UNITS.
BAYFILTER INSTALLATION NOTES
1. CONTACT UTILITY LOCATOR TO MARKANY NEARBY UNDERGROUND UTILITIES AND MAKE SURE ITISSAFETO EXCAVATE.
2. REFERENCE THE SITE PLAN AND STAKE OUT THE LOCATION OFTHE BAYFILTER VAULT.
3. EXCAVATE THE HOLE, PROVIDING ANY SHEETING AND SHORING NECESSARY TO COMPLY WITH ALL FEDERAL, STATE AND LOCALSAFETY
REGULATIONS.
4. LEVELTHE SUB- GRADE TO THE PROPER ELEVATION. VERIFY THE ELEVATION AGAINST THE MANHOLE DIMENSIONS, THE INVERT ELEVATIONS,
AND THE SITE PLANS. ADJUST THE BASE AGGREGATE, IFNECESSARY.
5. HAVE THE SOIL BEARING CAPACITY VERIFIED BYA LICENSED/ENGINEER FOR THE REQUIRED LOAD BEARING CAPACITY. ON SOLID SUB- GRADE,
SET THE FIRST SECTION OF THE BAYFILTER PRE --CAST VAULT.
6. CHECK THE LEVELAND ELEVATION OF THE FIRST SECTION TO ENSURE IT IS CORRECT BEFORE ADDING ANY RISER SECTIONS.
7. IFADDITIONAL SECTION(S)ARE REQUIRED, ADD A WATERTIGHT SEAL TO THE FIRST SECTION OFTHE BAYFILTER VAULT. SET ADDITIONAL
SECTION(S) OF THE VAULT, ADDING A WATERTIGHT SEAL TO EACH JOINT.
8. INSTALL THE PVC OUTLET MANIFOLD.
9. INSTALL THE PVC OUTLET PIPE IN BAYFILTER VAULT.
10. INSTALL THE INLET PIPE TO THE BAYFILTER VAULT.
11. AFTER THE SITE IS STABILIZED, REMOVE ANY ACCUMULATED SEDIMENT OR DEBRIS FROM THE VAULT AND INSTALL THE FLOW DISKS,
DRAINDOWN MODULES (IFAPPLICABLE), AND THE BAYFILTER CARTRIDGES.
12. PLACE FULL SET OF HOLD DOWN BARS AND BRACKETS INTO PLACE.
2021 ADS, INC.

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///ADS,.
Mills River Townhomes BMP #1
BAYFILTER 545 - 26x10x6.67ft BILL OF MATERIALS
22'(6.7056M) Ray Length
VD &D
141414114
PART NUMBER
QUANTITY
DESCRIPTION
1
28
6-IN PVC TEE WITH 1.5-
IN FLOWDISK
2
2
6-IN PVC TEE
3
28
24" L X 6" D PVC STUB
4
28
545 CARTRIDGES
5
6
DRAINDOWN
6
1
OUTLET PIPE
7
1
INLET PIPE
8
2
6-IN FLEXIBLE COUPLER
9
2
6-IN PVC (8 INCHES)
10
7
HOLD DOWN BAR (10
FEET)
11
1
TROLLEY SYSTEM
12
26
6-IN PVC PLUG

r DD)l
Detain kd #1A
BMP #1
StormTech DC-780
Subcat Reach on Link Routing Diagram for Mills River Townhomes
Prepared by {enter your company name here}, Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC

Mills River Townhomes Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment Pr D1: Detained #1A
Runoff = 32.51 cfs @ 11.96 hrs, Volume= 66,136 cf, Depth= 3.46"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.10"
Area (sf) CN Description
147,209
98 Impervious, HSG B
82,125
61 >75% Grass cover, Good, HSG B
229,334
85 Weighted Average
82,125
35.81 % Pervious Area
147,209
64.19% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
N
U
3
0
LL
Subcatchment Pr D1: Detained #1A
Hydrograph
36
34 32.51 cfs
32
30
28 _
26
Ay-
24
22
7
20
18
16
14
12
10
8
6
4
2
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 3
Hydrograph for Subcatchment Pr D1: Detained #1A
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.11
0.00
0.00
4.00
0.24
0.00
0.00
6.00
0.41
0.00
0.03
8.00
0.61
0.03
0.14
10.00
0.92
0.14
0.44
12.00
3.38
1.91
27.43
14.00
4.18
2.62
0.94
16.00
4.49
2.90
0.58
18.00
4.70
3.09
0.45
20.00
4.86
3.23
0.33
22.00
4.98
3.35
0.30
24.00
5.10
3.46
0.28
26.00
5.10
3.46
0.00
28.00
5.10
3.46
0.00
30.00
5.10
3.46
0.00
32.00
5.10
3.46
0.00
34.00
5.10
3.46
0.00
36.00
5.10
3.46
0.00
38.00
5.10
3.46
0.00
40.00
5.10
3.46
0.00
42.00
5.10
3.46
0.00
44.00
5.10
3.46
0.00
46.00
5.10
3.46
0.00
48.00
5.10
3.46
0.00
50.00
5.10
3.46
0.00
52.00
5.10
3.46
0.00
54.00
5.10
3.46
0.00
56.00
5.10
3.46
0.00
58.00
5.10
3.46
0.00
60.00
5.10
3.46
0.00
62.00
5.10
3.46
0.00
64.00
5.10
3.46
0.00
66.00
5.10
3.46
0.00
68.00
5.10
3.46
0.00
70.00
5.10
3.46
0.00
72.00
5.10
3.46
0.00
74.00
5.10
3.46
0.00
76.00
5.10
3.46
0.00
78.00
5.10
3.46
0.00
80.00
5.10
3.46
0.00
82.00
5.10
3.46
0.00
84.00
5.10
3.46
0.00
86.00
5.10
3.46
0.00
88.00
5.10
3.46
0.00
90.00
5.10
3.46
0.00
92.00
5.10
3.46
0.00
94.00
5.10
3.46
0.00
96.00
5.10
3.46
0.00
98.00
5.10
3.46
0.00
100.00
5.10
3.46
0.00
102.00
5.10
3.46
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
5.10
3.46
0.00
106.00
5.10
3.46
0.00
108.00
5.10
3.46
0.00
110.00
5.10
3.46
0.00
112.00
5.10
3.46
0.00
114.00
5.10
3.46
0.00
116.00
5.10
3.46
0.00
118.00
5.10
3.46
0.00
120.00
5.10
3.46
0.00
122.00
5.10
3.46
0.00
124.00
5.10
3.46
0.00
126.00
5.10
3.46
0.00
128.00
5.10
3.46
0.00
130.00
5.10
3.46
0.00
132.00
5.10
3.46
0.00
134.00
5.10
3.46
0.00
136.00
5.10
3.46
0.00
138.00
5.10
3.46
0.00
140.00
5.10
3.46
0.00
142.00
5.10
3.46
0.00
144.00
5.10
3.46
0.00
146.00
5.10
3.46
0.00
148.00
5.10
3.46
0.00
150.00
5.10
3.46
0.00
152.00
5.10
3.46
0.00
154.00
5.10
3.46
0.00
156.00
5.10
3.46
0.00
158.00
5.10
3.46
0.00
160.00
5.10
3.46
0.00
162.00
5.10
3.46
0.00
164.00
5.10
3.46
0.00
166.00
5.10
3.46
0.00
168.00
5.10
3.46
0.00
170.00
5.10
3.46
0.00
172.00
5.10
3.46
0.00
174.00
5.10
3.46
0.00
176.00
5.10
3.46
0.00
178.00
5.10
3.46
0.00
180.00
5.10
3.46
0.00
182.00
5.10
3.46
0.00
184.00
5.10
3.46
0.00
186.00
5.10
3.46
0.00
188.00
5.10
3.46
0.00
190.00
5.10
3.46
0.00
192.00
5.10
3.46
0.00
194.00
5.10
3.46
0.00
196.00
5.10
3.46
0.00
198.00
5.10
3.46
0.00
200.00
5.10
3.46
0.00

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 4
Summary for Pond BMP #1: StormTech DC-780
Inflow Area =
229,334 sf,
64.19% Impervious,
Inflow Depth = 3.46" for 10-Year event
Inflow =
32.51 cfs @
11.96 hrs, Volume=
66,136 cf
Outflow =
32.42 cfs @
11.96 hrs, Volume=
66,136 cf, Atten= 0%, Lag= 0.2 min
Primary =
32.42 cfs @
11.96 hrs, Volume=
66,136 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,080.49' @ 11.96 hrs Surf.Area= 1,534 sf Storage= 3,251 cf
Plug -Flow detention time= 6.2 min calculated for 66,133 cf (100% of inflow)
Center -of -Mass det. time= 6.2 min ( 808.9 - 802.8 )
Volume Invert Avail.Storage Storage Description
#1A 2,077.00' 1,561 cf 20.50'W x 74.82'L x 3.75'H Field A
5,752 cf Overall - 1,850 cf Embedded = 3,902 cf x 40.0% Voids
#2A 2,077.75' 1,850 cf ADS _StormTech DC-780 +Cap x 40 Inside #1
Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.121 = 46.2 cf
Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap
40 Chambers in 4 Rows
3,410 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,077.00'
36.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,077.00' / 2,076.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 7.07 sf
#2
Device 1
2,077.00'
6.0" Vert. Orifice X 2.00 C= 0.600
#3
Device 1
2,079.50'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 9.00 9.00
Primary OutFlow Max=32.35 cfs @ 11.96 hrs HW=2,080.49' (Free Discharge)
L1=Culvert (Passes 32.35 cfs of 41.86 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 3.40 cfs @ 8.66 fps)
(Weir Controls 28.95 cfs @ 3.26 fps)

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 5
Pond BMP #1: StormTech DC-780
Hyd rog raph
— Inflow
Primary
lin 1
Time (hours)

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 6
Hydrograph for Pond BMP #1: StormTech DC-780
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,077.00
0.00
5.00
0.00
0
2,077.00
0.00
10.00
0.44
175
2,077.29
0.42
15.00
0.75
254
2,077.41
0.76
20.00
0.33
153
2,077.25
0.33
25.00
0.00
15
2,077.02
0.01
30.00
0.00
0
2,077.00
0.00
35.00
0.00
0
2,077.00
0.00
40.00
0.00
0
2,077.00
0.00
45.00
0.00
0
2,077.00
0.00
50.00
0.00
0
2,077.00
0.00
55.00
0.00
0
2,077.00
0.00
60.00
0.00
0
2,077.00
0.00
65.00
0.00
0
2,077.00
0.00
70.00
0.00
0
2,077.00
0.00
75.00
0.00
0
2,077.00
0.00
80.00
0.00
0
2,077.00
0.00
85.00
0.00
0
2,077.00
0.00
90.00
0.00
0
2,077.00
0.00
95.00
0.00
0
2,077.00
0.00
100.00
0.00
0
2,077.00
0.00
105.00
0.00
0
2,077.00
0.00
110.00
0.00
0
2,077.00
0.00
115.00
0.00
0
2,077.00
0.00
120.00
0.00
0
2,077.00
0.00
125.00
0.00
0
2,077.00
0.00
130.00
0.00
0
2,077.00
0.00
135.00
0.00
0
2,077.00
0.00
140.00
0.00
0
2,077.00
0.00
145.00
0.00
0
2,077.00
0.00
150.00
0.00
0
2,077.00
0.00
155.00
0.00
0
2,077.00
0.00
160.00
0.00
0
2,077.00
0.00
165.00
0.00
0
2,077.00
0.00
170.00
0.00
0
2,077.00
0.00
175.00
0.00
0
2,077.00
0.00
180.00
0.00
0
2,077.00
0.00
185.00
0.00
0
2,077.00
0.00
190.00
0.00
0
2,077.00
0.00
195.00
0.00
0
2,077.00
0.00
200.00
0.00
0
2,077.00
0.00

Mills River Townhomes Type 11 24-hr 25-Year Rainfall=6. 01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment Pr D1: Detained #1A
Runoff = 39.98 cfs @ 11.96 hrs, Volume= 82,406 cf, Depth= 4.31"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.01"
Area (sf) CN Description
147,209
98 Impervious, HSG B
82,125
61 >75% Grass cover, Good, HSG B
229,334
85 Weighted Average
82,125
35.81 % Pervious Area
147,209
64.19% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
4
4
4
3
3
3
3
3
2
2
N
u 2
3 2
0 2
if:1
1
1
1
1
Subcatchment Pr D1: Detained #1A
Hydrograph
S
39.98 cfs
S
S
S
A�U
kma=
S
7
S
S_
s
C=
min
S_
S
S
S
S
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 8
Hydrograph for Subcatchment Pr D1: Detained #1A
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.13
0.00
0.00
4.00
0.29
0.00
0.00
6.00
0.48
0.01
0.07
8.00
0.72
0.06
0.22
10.00
1.09
0.22
0.61
12.00
3.98
2.44
33.59
14.00
4.93
3.30
1.13
16.00
5.29
3.64
0.70
18.00
5.54
3.87
0.54
20.00
5.72
4.04
0.40
22.00
5.87
4.18
0.36
24.00
6.01
4.31
0.33
26.00
6.01
4.31
0.00
28.00
6.01
4.31
0.00
30.00
6.01
4.31
0.00
32.00
6.01
4.31
0.00
34.00
6.01
4.31
0.00
36.00
6.01
4.31
0.00
38.00
6.01
4.31
0.00
40.00
6.01
4.31
0.00
42.00
6.01
4.31
0.00
44.00
6.01
4.31
0.00
46.00
6.01
4.31
0.00
48.00
6.01
4.31
0.00
50.00
6.01
4.31
0.00
52.00
6.01
4.31
0.00
54.00
6.01
4.31
0.00
56.00
6.01
4.31
0.00
58.00
6.01
4.31
0.00
60.00
6.01
4.31
0.00
62.00
6.01
4.31
0.00
64.00
6.01
4.31
0.00
66.00
6.01
4.31
0.00
68.00
6.01
4.31
0.00
70.00
6.01
4.31
0.00
72.00
6.01
4.31
0.00
74.00
6.01
4.31
0.00
76.00
6.01
4.31
0.00
78.00
6.01
4.31
0.00
80.00
6.01
4.31
0.00
82.00
6.01
4.31
0.00
84.00
6.01
4.31
0.00
86.00
6.01
4.31
0.00
88.00
6.01
4.31
0.00
90.00
6.01
4.31
0.00
92.00
6.01
4.31
0.00
94.00
6.01
4.31
0.00
96.00
6.01
4.31
0.00
98.00
6.01
4.31
0.00
100.00
6.01
4.31
0.00
102.00
6.01
4.31
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
6.01
4.31
0.00
106.00
6.01
4.31
0.00
108.00
6.01
4.31
0.00
110.00
6.01
4.31
0.00
112.00
6.01
4.31
0.00
114.00
6.01
4.31
0.00
116.00
6.01
4.31
0.00
118.00
6.01
4.31
0.00
120.00
6.01
4.31
0.00
122.00
6.01
4.31
0.00
124.00
6.01
4.31
0.00
126.00
6.01
4.31
0.00
128.00
6.01
4.31
0.00
130.00
6.01
4.31
0.00
132.00
6.01
4.31
0.00
134.00
6.01
4.31
0.00
136.00
6.01
4.31
0.00
138.00
6.01
4.31
0.00
140.00
6.01
4.31
0.00
142.00
6.01
4.31
0.00
144.00
6.01
4.31
0.00
146.00
6.01
4.31
0.00
148.00
6.01
4.31
0.00
150.00
6.01
4.31
0.00
152.00
6.01
4.31
0.00
154.00
6.01
4.31
0.00
156.00
6.01
4.31
0.00
158.00
6.01
4.31
0.00
160.00
6.01
4.31
0.00
162.00
6.01
4.31
0.00
164.00
6.01
4.31
0.00
166.00
6.01
4.31
0.00
168.00
6.01
4.31
0.00
170.00
6.01
4.31
0.00
172.00
6.01
4.31
0.00
174.00
6.01
4.31
0.00
176.00
6.01
4.31
0.00
178.00
6.01
4.31
0.00
180.00
6.01
4.31
0.00
182.00
6.01
4.31
0.00
184.00
6.01
4.31
0.00
186.00
6.01
4.31
0.00
188.00
6.01
4.31
0.00
190.00
6.01
4.31
0.00
192.00
6.01
4.31
0.00
194.00
6.01
4.31
0.00
196.00
6.01
4.31
0.00
198.00
6.01
4.31
0.00
200.00
6.01
4.31
0.00

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 9
Summary for Pond BMP #1: StormTech DC-780
Inflow Area =
229,334 sf,
64.19% Impervious,
Inflow Depth = 4.31" for 25-Year event
Inflow =
39.98 cfs @
11.96 hrs, Volume=
82,406 cf
Outflow =
39.88 cfs @
11.96 hrs, Volume=
82,409 cf, Atten= 0%, Lag= 0.2 min
Primary =
39.88 cfs @
11.96 hrs, Volume=
82,409 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,080.65' @ 11.96 hrs Surf.Area= 1,534 sf Storage= 3,349 cf
Plug -Flow detention time= 5.8 min calculated for 82,405 cf (100% of inflow)
Center -of -Mass det. time= 5.8 min ( 802.4 - 796.5 )
Volume Invert Avail.Storage Storage Description
#1A 2,077.00' 1,561 cf 20.50'W x 74.82'L x 3.75'H Field A
5,752 cf Overall - 1,850 cf Embedded = 3,902 cf x 40.0% Voids
#2A 2,077.75' 1,850 cf ADS _StormTech DC-780 +Cap x 40 Inside #1
Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.121 = 46.2 cf
Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap
40 Chambers in 4 Rows
3,410 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,077.00'
36.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,077.00' / 2,076.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 7.07 sf
#2
Device 1
2,077.00'
6.0" Vert. Orifice X 2.00 C= 0.600
#3
Device 1
2,079.50'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 9.00 9.00
Primary OutFlow Max=39.81 cfs @ 11.96 hrs HW=2,080.65' (Free Discharge)
L1=Culvert (Passes 39.81 cfs of 44.18 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 3.49 cfs @ 8.88 fps)
(Weir Controls 36.33 cfs @ 3.51 fps)

Mills River Townhomes Type 11 24-hr 25-Year Rainfall=6. 01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 10
Pond BMP #1: StormTech DC-780
Hyd rog raph
4
2
39.88
0
8
6
cfs
_
4
2
e
V
0
8
_
6
4
2
0
8
6
4
2
0
8
6
4
2
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Inflow
Primary

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 11
Hydrograph for Pond BMP #1: StormTech DC-780
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,077.00
0.00
5.00
0.01
3
2,077.01
0.00
10.00
0.61
214
2,077.35
0.59
15.00
0.90
298
2,077.49
0.92
20.00
0.40
170
2,077.28
0.40
25.00
0.00
15
2,077.02
0.01
30.00
0.00
0
2,077.00
0.00
35.00
0.00
0
2,077.00
0.00
40.00
0.00
0
2,077.00
0.00
45.00
0.00
0
2,077.00
0.00
50.00
0.00
0
2,077.00
0.00
55.00
0.00
0
2,077.00
0.00
60.00
0.00
0
2,077.00
0.00
65.00
0.00
0
2,077.00
0.00
70.00
0.00
0
2,077.00
0.00
75.00
0.00
0
2,077.00
0.00
80.00
0.00
0
2,077.00
0.00
85.00
0.00
0
2,077.00
0.00
90.00
0.00
0
2,077.00
0.00
95.00
0.00
0
2,077.00
0.00
100.00
0.00
0
2,077.00
0.00
105.00
0.00
0
2,077.00
0.00
110.00
0.00
0
2,077.00
0.00
115.00
0.00
0
2,077.00
0.00
120.00
0.00
0
2,077.00
0.00
125.00
0.00
0
2,077.00
0.00
130.00
0.00
0
2,077.00
0.00
135.00
0.00
0
2,077.00
0.00
140.00
0.00
0
2,077.00
0.00
145.00
0.00
0
2,077.00
0.00
150.00
0.00
0
2,077.00
0.00
155.00
0.00
0
2,077.00
0.00
160.00
0.00
0
2,077.00
0.00
165.00
0.00
0
2,077.00
0.00
170.00
0.00
0
2,077.00
0.00
175.00
0.00
0
2,077.00
0.00
180.00
0.00
0
2,077.00
0.00
185.00
0.00
0
2,077.00
0.00
190.00
0.00
0
2,077.00
0.00
195.00
0.00
0
2,077.00
0.00
200.00
0.00
0
2,077.00
0.00

Mills River Townhomes Type 11 24-hr WQ-BMP #1 Rainfall= 1. 77"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment Pr D1: Detained #1A
Runoff = 6.17 cfs @ 11.97 hrs, Volume= 12,061 cf, Depth= 0.63"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr WQ-BMP #1 Rainfall=1.77"
Area (sf) CN Description
147,209
98 Impervious, HSG B
82,125
61 >75% Grass cover, Good, HSG B
229,334
85 Weighted Average
82,125
35.81 % Pervious Area
147,209
64.19% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
6�
5
4-
N
U
3
0
LL 3-
2
1
Subcatchment Pr D1: Detained #1A
Hydrograph
6.17 cfs
ViQ-IBIYIIP
#1 111ai
Type
nfall=
1 I
4-
.7
r
"
Rur
Runoff
off
VOIIIJIM=12.0
Ara
22
,3
4
1
sf
f
u
of
D
pt
=
.6
"
C14=815
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr WQ-BMP #1 Rainfall= 1. 77"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 13
Hydrograph for Subcatchment Pr D1: Detained #1A
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.04
0.00
0.00
4.00
0.08
0.00
0.00
6.00
0.14
0.00
0.00
8.00
0.21
0.00
0.00
10.00
0.32
0.00
0.00
12.00
1.17
0.26
5.46
14.00
1.45
0.42
0.22
16.00
1.56
0.49
0.14
18.00
1.63
0.54
0.11
20.00
1.69
0.57
0.08
22.00
1.73
0.60
0.08
24.00
1.77
0.63
0.07
26.00
1.77
0.63
0.00
28.00
1.77
0.63
0.00
30.00
1.77
0.63
0.00
32.00
1.77
0.63
0.00
34.00
1.77
0.63
0.00
36.00
1.77
0.63
0.00
38.00
1.77
0.63
0.00
40.00
1.77
0.63
0.00
42.00
1.77
0.63
0.00
44.00
1.77
0.63
0.00
46.00
1.77
0.63
0.00
48.00
1.77
0.63
0.00
50.00
1.77
0.63
0.00
52.00
1.77
0.63
0.00
54.00
1.77
0.63
0.00
56.00
1.77
0.63
0.00
58.00
1.77
0.63
0.00
60.00
1.77
0.63
0.00
62.00
1.77
0.63
0.00
64.00
1.77
0.63
0.00
66.00
1.77
0.63
0.00
68.00
1.77
0.63
0.00
70.00
1.77
0.63
0.00
72.00
1.77
0.63
0.00
74.00
1.77
0.63
0.00
76.00
1.77
0.63
0.00
78.00
1.77
0.63
0.00
80.00
1.77
0.63
0.00
82.00
1.77
0.63
0.00
84.00
1.77
0.63
0.00
86.00
1.77
0.63
0.00
88.00
1.77
0.63
0.00
90.00
1.77
0.63
0.00
92.00
1.77
0.63
0.00
94.00
1.77
0.63
0.00
96.00
1.77
0.63
0.00
98.00
1.77
0.63
0.00
100.00
1.77
0.63
0.00
102.00
1.77
0.63
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
1.77
0.63
0.00
106.00
1.77
0.63
0.00
108.00
1.77
0.63
0.00
110.00
1.77
0.63
0.00
112.00
1.77
0.63
0.00
114.00
1.77
0.63
0.00
116.00
1.77
0.63
0.00
118.00
1.77
0.63
0.00
120.00
1.77
0.63
0.00
122.00
1.77
0.63
0.00
124.00
1.77
0.63
0.00
126.00
1.77
0.63
0.00
128.00
1.77
0.63
0.00
130.00
1.77
0.63
0.00
132.00
1.77
0.63
0.00
134.00
1.77
0.63
0.00
136.00
1.77
0.63
0.00
138.00
1.77
0.63
0.00
140.00
1.77
0.63
0.00
142.00
1.77
0.63
0.00
144.00
1.77
0.63
0.00
146.00
1.77
0.63
0.00
148.00
1.77
0.63
0.00
150.00
1.77
0.63
0.00
152.00
1.77
0.63
0.00
154.00
1.77
0.63
0.00
156.00
1.77
0.63
0.00
158.00
1.77
0.63
0.00
160.00
1.77
0.63
0.00
162.00
1.77
0.63
0.00
164.00
1.77
0.63
0.00
166.00
1.77
0.63
0.00
168.00
1.77
0.63
0.00
170.00
1.77
0.63
0.00
172.00
1.77
0.63
0.00
174.00
1.77
0.63
0.00
176.00
1.77
0.63
0.00
178.00
1.77
0.63
0.00
180.00
1.77
0.63
0.00
182.00
1.77
0.63
0.00
184.00
1.77
0.63
0.00
186.00
1.77
0.63
0.00
188.00
1.77
0.63
0.00
190.00
1.77
0.63
0.00
192.00
1.77
0.63
0.00
194.00
1.77
0.63
0.00
196.00
1.77
0.63
0.00
198.00
1.77
0.63
0.00
200.00
1.77
0.63
0.00

Mills River Townhomes
Type 11 24-hr WQ-BMP #1 Rainfall= 1. 77"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 14
Summary for Pond BMP #1: StormTech DC-780
Inflow Area =
229,334 sf,
64.19% Impervious,
Inflow Depth = 0.63" for WQ-BMP #1 event
Inflow =
6.17 cfs @
11.97 hrs, Volume=
12,061 cf
Outflow =
2.76 cfs @
12.05 hrs, Volume=
12,061 cf, Atten= 55%, Lag= 5.3 min
Primary =
2.76 cfs @
12.05 hrs, Volume=
12,061 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,079.38' @ 12.05 hrs Surf.Area= 1,534 sf Storage= 2,365 cf
Plug -Flow detention time= 10.7 min calculated for 12,061 cf (100% of inflow)
Center -of -Mass det. time= 10.8 min ( 862.7 - 851.9 )
Volume Invert Avail.Storage Storage Description
#1A 2,077.00' 1,561 cf 20.50'W x 74.82'L x 3.75'H Field A
5,752 cf Overall - 1,850 cf Embedded = 3,902 cf x 40.0% Voids
#2A 2,077.75' 1,850 cf ADS _StormTech DC-780 +Cap x 40 Inside #1
Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.121 = 46.2 cf
Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap
40 Chambers in 4 Rows
3,410 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,077.00'
36.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,077.00' / 2,076.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 7.07 sf
#2
Device 1
2,077.00'
6.0" Vert. Orifice X 2.00 C= 0.600
#3
Device 1
2,079.50'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 9.00 9.00
Primary OutFlow Max=2.76 cfs @ 12.05 hrs HW=2,079.38' (Free Discharge)
L1=Culvert (Passes 2.76 cfs of 23.63 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 2.76 cfs @ 7.02 fps)
( Controls 0.00 cfs)

Mills River Townhomes Type 11 24-hr WQ-BMP #1 Rainfall= 1. 77"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 15
N
U
3
0
LL
Pond BMP #1: StormTech DC-780
Hyd rog raph
6.17 cfs
Inflow A e =2 9 33 f
5
t rage 2 365 df
4
3 2.76 cfs
2
1
0
0 10 20 30 40 50 60 70 80 90 160 110 120 130 140 150 160 170 180 190 200
Time (hours)
Inflow
Primary

Mills River Townhomes
Type 11 24-hr WQ-BMP #1 Rainfall= 1. 77"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 16
Hydrograph for Pond BMP #1: StormTech DC-780
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,077.00
0.00
5.00
0.00
0
2,077.00
0.00
10.00
0.00
0
2,077.00
0.00
15.00
0.18
111
2,077.18
0.19
20.00
0.08
73
2,077.12
0.09
25.00
0.00
12
2,077.02
0.00
30.00
0.00
0
2,077.00
0.00
35.00
0.00
0
2,077.00
0.00
40.00
0.00
0
2,077.00
0.00
45.00
0.00
0
2,077.00
0.00
50.00
0.00
0
2,077.00
0.00
55.00
0.00
0
2,077.00
0.00
60.00
0.00
0
2,077.00
0.00
65.00
0.00
0
2,077.00
0.00
70.00
0.00
0
2,077.00
0.00
75.00
0.00
0
2,077.00
0.00
80.00
0.00
0
2,077.00
0.00
85.00
0.00
0
2,077.00
0.00
90.00
0.00
0
2,077.00
0.00
95.00
0.00
0
2,077.00
0.00
100.00
0.00
0
2,077.00
0.00
105.00
0.00
0
2,077.00
0.00
110.00
0.00
0
2,077.00
0.00
115.00
0.00
0
2,077.00
0.00
120.00
0.00
0
2,077.00
0.00
125.00
0.00
0
2,077.00
0.00
130.00
0.00
0
2,077.00
0.00
135.00
0.00
0
2,077.00
0.00
140.00
0.00
0
2,077.00
0.00
145.00
0.00
0
2,077.00
0.00
150.00
0.00
0
2,077.00
0.00
155.00
0.00
0
2,077.00
0.00
160.00
0.00
0
2,077.00
0.00
165.00
0.00
0
2,077.00
0.00
170.00
0.00
0
2,077.00
0.00
175.00
0.00
0
2,077.00
0.00
180.00
0.00
0
2,077.00
0.00
185.00
0.00
0
2,077.00
0.00
190.00
0.00
0
2,077.00
0.00
195.00
0.00
0
2,077.00
0.00
200.00
0.00
0
2,077.00
0.00

//fic)STIVI
Advanced Drainage Systems, Inc.
Mills River Townhornes BMP#2
Mills River- NC
BAYSAVER BAYFILTER SPECIFICATIONS
PRODUCTS
A. INTERNAL COMPONENTS: ALL COMPONENTS INCLUDING CONCRETE STRUCTURE(S), PVC MANIFOLD PIPING AND FILTER CARTRIDGES,
SHALL BE PROVIDED BY BAYSAVER TECHNOLOGIES LLC, 1030 DEER HOLLOW DRIVE, MOUNTAIRY, MD (800.229.7283).
B. PVC MANIFOLD PIPING: ALL INTERNAL PVC PIPE AND FITTINGS SHALL MEET ASTM D1785. MANIFOLD PIPING SHALL BE PROVIDED TO THE
CONTRACTOR PARTIALLY PRE-CUTAND PRE -ASSEMBLED.
C. FILTER CARTRIDGES: EXTERNAL SHELL OF THE FILTER CARTRIDGES SHALL BE SUBSTANTIALLY CONSTRUCTED OF POLYETHYLENE OR
EQUIVALENT MATERIAL ACCEPTABLE TO THE MANUFACTURER. FILTRATION MEDIA SHALL BE ARRANGED IN A SPIRAL LAYERED FASHION
TO MAXIMIZE AVAILABLE FILTRATION AREA. AN ORIFICE PLATE SHALL BE SUPPLIED WITH EACH CARTRIDGE TO RESTRICT THE FLOW RATE
TOAMAXIMUM OF45GPM.
D. FILTER MEDIA: FILTER MEDIA SHALL BE BY BAYSAVER TECHNOLOGIES LLC AND SHALL CONSIST OF THE FOLLOWING MIX: A BLEND OF
ZEOLITE, PERLITE AND ACTIVATED ALUMINA.
E. PRECAST CONCRETE VAULT: CONCRETE STRUCTURES SHALL BE PROVIDED ACCORDING TO ASTM C. THE MATERIALS AND STRUCTURAL
DESIGN OF THE DEVICES SHALL BE PER ASTM C478, C857 AND C858. PRECAST CONCRETE SHALL BE PROVIDED BY BAYSAVER
TECHNOLOGIES, LLC.
PERFORMANCE
A. THE STORMWATER FILTER SYSTEM SHALL BEAN OFFLINE DESIGN CAPABLE OFTREATING 100%OFTHE REQUIRED TREATMENT FLOWAT
FULLSEDIMENT LOAD CONDITIONS.
B. THE STORMWATER FILTER SYSTEM'S CARTRIDGES SHALL HAVE NO MOVING PARTS.
C. THE STORMWATER TREATMENT UNIT SHALL BE DESIGNED TO REMOVE AT LEAST 85% OF SUSPENDED SOLIDS, 65% OF TOTAL
PHOSPHORUS, 65% OF TURBIDITY, 40% OFTOTAL COPPER, AND 40% OF TOTAL ZINC BASED ON FIELD DATA COLLECTED IN COMPLIANCE
WITH THE TECHNOLOGY ACCEPTANCE RECIPROCITY PARTNERSHIPTIER IITEST PROTOCOL.
D. THE STORMWATER FILTRATION SYSTEM SHALL REDUCE INCOMING TURBIDITY (MEASURED AS NTUs) BY 50% OR MOREAND SHALL NOT
HAVE ANY COMPONENTS THAT LEACH NITRATES OR PHOSPHATES.
E. THE STORMWATER FILTRATION CARTRIDGE SHALL BE EQUIPPED WITH A HYDRODYNAMIC BACKWASH MECHANISM TO EXTEND THE
FILTER'S LIFEAND OPTIMIZE ITS PERFORMANCE.
F. THE STORMWATER FILTRATION SYSTEM SHALL BE DESIGNED TO REMOVE A MINIMUM OF 65% OFTHE INCOMING TOTAL PHOSPHORUS
(TP) LOAD.
G. THE STORMWATER FILTRATION SYSTEM'S CARTRIDGES SHALL HAVE A TREATED SEDIMENT CAPACITY FOR 80%TSS REMOVAL BETWEEN
150-350LBS.
BAYFILTER MAINTENANCE
THE BAYFILTER SYSTEM REQUIRES PERIODIC MAINTENANCE TO CONTINUE OPERATING AT ITS PEAK EFFICIENCY DESIGN. THE MAINTENANCE
PROCESS COMPRISES THE REMOVAL AND REPLACEMENT OF EACH BAYFILTER CARTRIDGE AND THE CLEANING OF THE VAULT OR MANHOLE WITH A
VACUUM TRUCK. FOR BEST RESULTS, BAYFILTER MAINTENANCE SHOULD BE PERFORMED BY A CERTIFIED MAINTENANCE CONTRACTOR. A QUICK
CALL TO AN ADS ENGINEER OR CUSTOMER SERVICE REPRESENTATIVE WILL PROVIDE YOU WITH A LIST OF RELIABLE CONTRACTORS IN YOUR AREA.
WHEN BAYFILTER IS INITIALLY INSTALLED, WE RECOMMEND THAT AN INSPECTION BE PERFORMED ON THE SYSTEM IN THE FIRST SIX (6) MONTHS.
AFTER THAT, THE INSPECTION CYCLE TYPICALLY FALLS INTO A BIANNUAL PATTERN GIVEN NORMAL STORM OCCURRENCE AND ACTUAL SOLIDS
LOADS.
WHEN BAYFILTER EXHIBITS FLOWS BELOW DESIGN LEVELS, THE SYSTEM SHOULD BE INSPECTED AND MAINTAINED AS SOON AS PRACTICAL.
REPLACING A BAYFILTER CARTRIDGE SHOULD BE CONSIDERED AT ORABOVE THE LEVEL OF THE MANIFOLD.
MAINTENANCE PROCEDURES
1. REMOVE THE MANHOLE COVERS AND OPEN ALLACCESS HATCHES.
2. BEFORE ENTERING THE SYSTEM MAKE SURE THE AIR IS SAFE PER OSHA STANDARDS OR USE BREATHING APPARATUS. USE LOW 02, HIGH
CO, OR OTHER APPLICABLE WARNING DEVICES PER REGULATORY REQUIREMENTS.
3. USING A VACUUM TRUCK, REMOVE ANY LIQUID AND SEDIMENTS THAT CAN BE REMOVED PRIOR TO ENTRY.
4. USING A SMALL LIFT OR THE BOOM OF THE VACUUM TRUCK, REMOVE THE USED CARTRIDGES BY LIFTING THEM OUT.
5. ANY CARTRIDGES THAT CANNOT BE READILY LIFTED CAN BE EASILY SLID ALONG THE FLOOR TO A LOCATION THEY CAN BE LIFTED VIA BOOM
LIFT.
6. WHEN ALL THE CARTRIDGES HAVE BEEN REMOVED, IT IS NOW PRACTICAL TO REMOVE THE BALANCE OF THE SOLIDS AND WATER. LOOSEN THE
STAINLESS CLAMPS ON THE FERNCO COUPLINGS FOR THE MANIFOLD AND REMOVE THE DRAINPIPES AS WELL. CAREFULLY CAP THE MANIFOLD
AND THE FERNCO'S AND RINSE THE FLOOR, WASHING AWAY THE BALANCE OFANY REMAINING COLLECTED SOLIDS.
7. CLEAN THE MANIFOLD PIPES, INSPECT, AND REINSTALL.
8. INSTALLTHE EXCHANGE CARTRIDGES AND CLOSE ALL COVERS.
9. THE USED CARTRIDGES MUST BE SENT BACK TO ADS FOR EXCHANGE/RECYCLING AND CREDIT ON UNDAMAGED UNITS.
BAYFILTER INSTALLATION NOTES
1. CONTACT UTILITY LOCATOR TO MARKANY NEARBY UNDERGROUND UTILITIES AND MAKE SURE ITISSAFETO EXCAVATE.
2. REFERENCE THE SITE PLAN AND STAKE OUT THE LOCATION OFTHE BAYFILTER VAULT.
3. EXCAVATE THE HOLE, PROVIDING ANY SHEETING AND SHORING NECESSARY TO COMPLY WITH ALL FEDERAL, STATE AND LOCALSAFETY
REGULATIONS.
4. LEVELTHE SUB- GRADE TO THE PROPER ELEVATION. VERIFY THE ELEVATION AGAINST THE MANHOLE DIMENSIONS, THE INVERT ELEVATIONS,
AND THE SITE PLANS. ADJUST THE BASE AGGREGATE, IFNECESSARY.
5. HAVE THE SOIL BEARING CAPACITY VERIFIED BYA LICENSED/ENGINEER FOR THE REQUIRED LOAD BEARING CAPACITY. ON SOLID SUB- GRADE,
SET THE FIRST SECTION OF THE BAYFILTER PRE --CAST VAULT.
6. CHECK THE LEVELAND ELEVATION OF THE FIRST SECTION TO ENSURE IT IS CORRECT BEFORE ADDING ANY RISER SECTIONS.
7. IFADDITIONAL SECTION(S)ARE REQUIRED, ADD A WATERTIGHT SEAL TO THE FIRST SECTION OFTHE BAYFILTER VAULT. SET ADDITIONAL
SECTION(S) OF THE VAULT, ADDING A WATERTIGHT SEAL TO EACH JOINT.
8. INSTALL THE PVC OUTLET MANIFOLD.
9. INSTALL THE PVC OUTLET PIPE IN BAYFILTER VAULT.
10. INSTALL THE INLET PIPE TO THE BAYFILTER VAULT.
11. AFTER THE SITE IS STABILIZED, REMOVE ANY ACCUMULATED SEDIMENT OR DEBRIS FROM THE VAULT AND INSTALL THE FLOW DISKS,
DRAINDOWN MODULES (IFAPPLICABLE), AND THE BAYFILTER CARTRIDGES.
12. PLACE FULL SET OF HOLD DOWN BARS AND BRACKETS INTO PLACE.
2021 ADS, INC.

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///ADS,.
Mills River Townhomes BMP#2
BAYFILTER 545 - 15x8x6.67ft BILL OF MATERIALS
PART NUMBER
QUANTITY
DESCRIPTION
1
12
6-IN PVC TEE WITH 1.5-
IN FLOWDISK
2
11
24" L X 6" D PVC STUB
3
12
545 CARTRIDGES
4
3
DRAINDOWN
5
1
OUTLET PIPE
6
1
INLET PIPE
7
1
6-IN FLEXIBLE COUPLER
8
4
6-IN PVC (8 INCHES)
9
4
HOLD DOWN BAR (8
FEET)
10
1
TROLLEY SYSTEM
11
9
6-IN PVC PLUG

Pr DD2
Detai ed #2
BMP #2
StormTech MC-3500
Subcat Reach on Link Routing Diagram for Mills River Townhomes
Prepared by {enter your company name here}, Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC

Mills River Townhomes Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment Pr D2: Detained #2
Runoff = 25.20 cfs @ 11.96 hrs, Volume= 53,778 cf, Depth= 4.08"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.10"
Area (sf) CN Description
126,729
31,471
98 Unconnected pavement, HSG B
61 >75% Grass cover, Good, HSG B
158,200
91 Weighted Average
31,471
19.89% Pervious Area
126,729
80.11% Impervious Area
126,729
100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
2s
26
24
22
20
18
H 16
U
3 14
0
LL 12
10
8
6
4
2
0
Subcatchment Pr D2: Detained #2
Hydrograph
25.20 cfs
0-"(eELrRainfall=r.
R
n
ff
r
a=15
,2
0
f
u
of:
Vlu
e5
78
f
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 3
Hydrograph for Subcatchment Pr D2: Detained #2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.11
0.00
0.00
4.00
0.24
0.00
0.02
6.00
0.41
0.04
0.10
8.00
0.61
0.12
0.20
10.00
0.92
0.31
0.48
12.00
3.38
2.43
21.00
14.00
4.18
3.19
0.69
16.00
4.49
3.49
0.42
18.00
4.70
3.69
0.33
20.00
4.86
3.84
0.24
22.00
4.98
3.97
0.22
24.00
5.10
4.08
0.20
26.00
5.10
4.08
0.00
28.00
5.10
4.08
0.00
30.00
5.10
4.08
0.00
32.00
5.10
4.08
0.00
34.00
5.10
4.08
0.00
36.00
5.10
4.08
0.00
38.00
5.10
4.08
0.00
40.00
5.10
4.08
0.00
42.00
5.10
4.08
0.00
44.00
5.10
4.08
0.00
46.00
5.10
4.08
0.00
48.00
5.10
4.08
0.00
50.00
5.10
4.08
0.00
52.00
5.10
4.08
0.00
54.00
5.10
4.08
0.00
56.00
5.10
4.08
0.00
58.00
5.10
4.08
0.00
60.00
5.10
4.08
0.00
62.00
5.10
4.08
0.00
64.00
5.10
4.08
0.00
66.00
5.10
4.08
0.00
68.00
5.10
4.08
0.00
70.00
5.10
4.08
0.00
72.00
5.10
4.08
0.00
74.00
5.10
4.08
0.00
76.00
5.10
4.08
0.00
78.00
5.10
4.08
0.00
80.00
5.10
4.08
0.00
82.00
5.10
4.08
0.00
84.00
5.10
4.08
0.00
86.00
5.10
4.08
0.00
88.00
5.10
4.08
0.00
90.00
5.10
4.08
0.00
92.00
5.10
4.08
0.00
94.00
5.10
4.08
0.00
96.00
5.10
4.08
0.00
98.00
5.10
4.08
0.00
100.00
5.10
4.08
0.00
102.00
5.10
4.08
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
5.10
4.08
0.00
106.00
5.10
4.08
0.00
108.00
5.10
4.08
0.00
110.00
5.10
4.08
0.00
112.00
5.10
4.08
0.00
114.00
5.10
4.08
0.00
116.00
5.10
4.08
0.00
118.00
5.10
4.08
0.00
120.00
5.10
4.08
0.00
122.00
5.10
4.08
0.00
124.00
5.10
4.08
0.00
126.00
5.10
4.08
0.00
128.00
5.10
4.08
0.00
130.00
5.10
4.08
0.00
132.00
5.10
4.08
0.00
134.00
5.10
4.08
0.00
136.00
5.10
4.08
0.00
138.00
5.10
4.08
0.00
140.00
5.10
4.08
0.00
142.00
5.10
4.08
0.00
144.00
5.10
4.08
0.00
146.00
5.10
4.08
0.00
148.00
5.10
4.08
0.00
150.00
5.10
4.08
0.00
152.00
5.10
4.08
0.00
154.00
5.10
4.08
0.00
156.00
5.10
4.08
0.00
158.00
5.10
4.08
0.00
160.00
5.10
4.08
0.00
162.00
5.10
4.08
0.00
164.00
5.10
4.08
0.00
166.00
5.10
4.08
0.00
168.00
5.10
4.08
0.00
170.00
5.10
4.08
0.00
172.00
5.10
4.08
0.00
174.00
5.10
4.08
0.00
176.00
5.10
4.08
0.00
178.00
5.10
4.08
0.00
180.00
5.10
4.08
0.00
182.00
5.10
4.08
0.00
184.00
5.10
4.08
0.00
186.00
5.10
4.08
0.00
188.00
5.10
4.08
0.00
190.00
5.10
4.08
0.00
192.00
5.10
4.08
0.00
194.00
5.10
4.08
0.00
196.00
5.10
4.08
0.00
198.00
5.10
4.08
0.00
200.00
5.10
4.08
0.00

Mills River Townhomes Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 4
Summary for Pond BMP #2: StormTech MC-3500
Inflow Area = 158,200 sf, 80.11% Impervious, Inflow Depth = 4.08" for 10-Year event
Inflow = 25.20 cfs @ 11.96 hrs, Volume= 53,778 cf
Outflow = 25.08 cfs @ 11.96 hrs, Volume= 53,778 cf, Atten= 0%, Lag= 0.3 min
Primary = 25.08 cfs @ 11.96 hrs, Volume= 53,778 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,079.23' @ 11.96 hrs Surf.Area= 1,318 sf Storage= 4,245 cf
Flood Elev= 2,080.50' Surf.Area= 1,318 sf Storage= 4,386 cf
Plug -Flow detention time= 16.3 min calculated for 53,775 cf (100% of inflow)
Center -of -Mass det. time= 16.3 min ( 798.3 - 782.0 )
Volume Invert Avail.Storage Storage Description
#1A 2,074.00' 1,908 cf 15.58'W x 84.57'L x 5.50'H Field A
7,248 cf Overall - 2,479 cf Embedded = 4,770 cf x 40.0% Voids
#2A 2,074.75' 2,479 cf ADS _StormTech MC-3500 d +Cap x 22 Inside #1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.171 = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
22 Chambers in 2 Rows
Cap Storaae= +14.9 cf x 2 x 2 rows = 59.6 cf
4,386 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,074.00'
30.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,074.00' / 2,073.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 4.91 sf
#2
Device 1
2,074.00'
3.5" Vert. Orifice X 2.00 C= 0.600
#3
Device 1
2,077.75'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.75
Width (feet) 4.00 4.00
Primary OutFlow Max=25.03 cfs @ 11.96 hrs HW=2,079.23' (Free Discharge)
L1=Culvert (Passes 25.03 cfs of 47.15 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 1.45 cfs @ 10.86 fps)
(Weir Controls 23.57 cfs @ 3.98 fps)

Mills River Townhomes Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 5
Pond BMP #2: StormTech MC-3500
Hyd rog raph
28
26 25.08 cfs
24—[in-ffi e
22
20 ek Iv2 7.2'
18
16
14
12
10
8
6
4
2
0
0 10 20 30 40 50 60 70 80 90 160 110 120 130 140 150 160 170 180 190 200
Time (hours)
Inflow
Primary

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 6
Hydrograph for Pond BMP #2: StormTech MC-3500
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,074.00
0.00
5.00
0.06
56
2,074.11
0.05
10.00
0.48
304
2,074.58
0.42
15.00
0.55
1,392
2,075.68
0.80
20.00
0.24
155
2,074.29
0.25
25.00
0.00
11
2,074.02
0.01
30.00
0.00
0
2,074.00
0.00
35.00
0.00
0
2,074.00
0.00
40.00
0.00
0
2,074.00
0.00
45.00
0.00
0
2,074.00
0.00
50.00
0.00
0
2,074.00
0.00
55.00
0.00
0
2,074.00
0.00
60.00
0.00
0
2,074.00
0.00
65.00
0.00
0
2,074.00
0.00
70.00
0.00
0
2,074.00
0.00
75.00
0.00
0
2,074.00
0.00
80.00
0.00
0
2,074.00
0.00
85.00
0.00
0
2,074.00
0.00
90.00
0.00
0
2,074.00
0.00
95.00
0.00
0
2,074.00
0.00
100.00
0.00
0
2,074.00
0.00
105.00
0.00
0
2,074.00
0.00
110.00
0.00
0
2,074.00
0.00
115.00
0.00
0
2,074.00
0.00
120.00
0.00
0
2,074.00
0.00
125.00
0.00
0
2,074.00
0.00
130.00
0.00
0
2,074.00
0.00
135.00
0.00
0
2,074.00
0.00
140.00
0.00
0
2,074.00
0.00
145.00
0.00
0
2,074.00
0.00
150.00
0.00
0
2,074.00
0.00
155.00
0.00
0
2,074.00
0.00
160.00
0.00
0
2,074.00
0.00
165.00
0.00
0
2,074.00
0.00
170.00
0.00
0
2,074.00
0.00
175.00
0.00
0
2,074.00
0.00
180.00
0.00
0
2,074.00
0.00
185.00
0.00
0
2,074.00
0.00
190.00
0.00
0
2,074.00
0.00
195.00
0.00
0
2,074.00
0.00
200.00
0.00
0
2,074.00
0.00

Mills River Townhomes Type 11 24-hr 25-Year Rainfall=6. 01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment Pr D2: Detained #2
Runoff = 30.28 cfs @ 11.96 hrs, Volume= 65,482 cf, Depth= 4.97"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.01"
Area (sf) CN Description
126,729
31,471
98 Unconnected pavement, HSG B
61 >75% Grass cover, Good, HSG B
158,200
91 Weighted Average
31,471
19.89% Pervious Area
126,729
80.11% Impervious Area
126,729
100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment Pr D2: Detained #2
Hydrograph
2
30.28
0
8
cfs
6
4
2
R
n
ff
r
a=15
2
0
f
o
,
6
Ru
n
o
P
=
4
2
0
8
6
4
2
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 8
Hydrograph for Subcatchment Pr D2: Detained #2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.13
0.00
0.00
4.00
0.29
0.01
0.05
6.00
0.48
0.06
0.15
8.00
0.72
0.18
0.27
10.00
1.09
0.42
0.61
12.00
3.98
3.00
25.17
14.00
4.93
3.91
0.82
16.00
5.29
4.26
0.50
18.00
5.54
4.50
0.39
20.00
5.72
4.68
0.28
22.00
5.87
4.83
0.26
24.00
6.01
4.97
0.24
26.00
6.01
4.97
0.00
28.00
6.01
4.97
0.00
30.00
6.01
4.97
0.00
32.00
6.01
4.97
0.00
34.00
6.01
4.97
0.00
36.00
6.01
4.97
0.00
38.00
6.01
4.97
0.00
40.00
6.01
4.97
0.00
42.00
6.01
4.97
0.00
44.00
6.01
4.97
0.00
46.00
6.01
4.97
0.00
48.00
6.01
4.97
0.00
50.00
6.01
4.97
0.00
52.00
6.01
4.97
0.00
54.00
6.01
4.97
0.00
56.00
6.01
4.97
0.00
58.00
6.01
4.97
0.00
60.00
6.01
4.97
0.00
62.00
6.01
4.97
0.00
64.00
6.01
4.97
0.00
66.00
6.01
4.97
0.00
68.00
6.01
4.97
0.00
70.00
6.01
4.97
0.00
72.00
6.01
4.97
0.00
74.00
6.01
4.97
0.00
76.00
6.01
4.97
0.00
78.00
6.01
4.97
0.00
80.00
6.01
4.97
0.00
82.00
6.01
4.97
0.00
84.00
6.01
4.97
0.00
86.00
6.01
4.97
0.00
88.00
6.01
4.97
0.00
90.00
6.01
4.97
0.00
92.00
6.01
4.97
0.00
94.00
6.01
4.97
0.00
96.00
6.01
4.97
0.00
98.00
6.01
4.97
0.00
100.00
6.01
4.97
0.00
102.00
6.01
4.97
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
6.01
4.97
0.00
106.00
6.01
4.97
0.00
108.00
6.01
4.97
0.00
110.00
6.01
4.97
0.00
112.00
6.01
4.97
0.00
114.00
6.01
4.97
0.00
116.00
6.01
4.97
0.00
118.00
6.01
4.97
0.00
120.00
6.01
4.97
0.00
122.00
6.01
4.97
0.00
124.00
6.01
4.97
0.00
126.00
6.01
4.97
0.00
128.00
6.01
4.97
0.00
130.00
6.01
4.97
0.00
132.00
6.01
4.97
0.00
134.00
6.01
4.97
0.00
136.00
6.01
4.97
0.00
138.00
6.01
4.97
0.00
140.00
6.01
4.97
0.00
142.00
6.01
4.97
0.00
144.00
6.01
4.97
0.00
146.00
6.01
4.97
0.00
148.00
6.01
4.97
0.00
150.00
6.01
4.97
0.00
152.00
6.01
4.97
0.00
154.00
6.01
4.97
0.00
156.00
6.01
4.97
0.00
158.00
6.01
4.97
0.00
160.00
6.01
4.97
0.00
162.00
6.01
4.97
0.00
164.00
6.01
4.97
0.00
166.00
6.01
4.97
0.00
168.00
6.01
4.97
0.00
170.00
6.01
4.97
0.00
172.00
6.01
4.97
0.00
174.00
6.01
4.97
0.00
176.00
6.01
4.97
0.00
178.00
6.01
4.97
0.00
180.00
6.01
4.97
0.00
182.00
6.01
4.97
0.00
184.00
6.01
4.97
0.00
186.00
6.01
4.97
0.00
188.00
6.01
4.97
0.00
190.00
6.01
4.97
0.00
192.00
6.01
4.97
0.00
194.00
6.01
4.97
0.00
196.00
6.01
4.97
0.00
198.00
6.01
4.97
0.00
200.00
6.01
4.97
0.00

Mills River Townhomes Type 11 24-hr 25-Year Rainfall=6. 01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 9
Summary for Pond BMP #2: StormTech MC-3500
Inflow Area = 158,200 sf, 80.11% Impervious, Inflow Depth = 4.97" for 25-Year event
Inflow = 30.28 cfs @ 11.96 hrs, Volume= 65,482 cf
Outflow = 30.14 cfs @ 11.96 hrs, Volume= 65,482 cf, Atten= 0%, Lag= 0.3 min
Primary = 30.14 cfs @ 11.96 hrs, Volume= 65,482 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,079.44' @ 11.96 hrs Surf.Area= 1,318 sf Storage= 4,352 cf
Flood Elev= 2,080.50' Surf.Area= 1,318 sf Storage= 4,386 cf
Plug -Flow detention time= 16.0 min calculated for 65,478 cf (100% of inflow)
Center -of -Mass det. time= 16.0 min ( 792.7 - 776.7 )
Volume Invert Avail.Storage Storage Description
#1A 2,074.00' 1,908 cf 15.58'W x 84.57'L x 5.50'H Field A
7,248 cf Overall - 2,479 cf Embedded = 4,770 cf x 40.0% Voids
#2A 2,074.75' 2,479 cf ADS _StormTech MC-3500 d +Cap x 22 Inside #1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.171 = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
22 Chambers in 2 Rows
Cap Storaae= +14.9 cf x 2 x 2 rows = 59.6 cf
4,386 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,074.00'
30.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,074.00' / 2,073.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 4.91 sf
#2
Device 1
2,074.00'
3.5" Vert. Orifice X 2.00 C= 0.600
#3
Device 1
2,077.75'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.75
Width (feet) 4.00 4.00
Primary OutFlow Max=30.09 cfs @ 11.96 hrs HW=2,079.43' (Free Discharge)
L1=Culvert (Passes 30.09 cfs of 48.34 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 1.48 cfs @ 11.07 fps)
(Weir Controls 28.61 cfs @ 4.25 fps)

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 10
Pond BMP #2: StormTech MC-3500
Hyd rog raph
— Inflow
Primary
lin 1
Time (hours)

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 11
Hydrograph for Pond BMP #2: StormTech MC-3500
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,074.00
0.00
5.00
0.10
77
2,074.15
0.09
10.00
0.61
439
2,074.79
0.52
15.00
0.65
1,858
2,076.12
0.90
20.00
0.28
188
2,074.36
0.30
25.00
0.00
12
2,074.02
0.01
30.00
0.00
0
2,074.00
0.00
35.00
0.00
0
2,074.00
0.00
40.00
0.00
0
2,074.00
0.00
45.00
0.00
0
2,074.00
0.00
50.00
0.00
0
2,074.00
0.00
55.00
0.00
0
2,074.00
0.00
60.00
0.00
0
2,074.00
0.00
65.00
0.00
0
2,074.00
0.00
70.00
0.00
0
2,074.00
0.00
75.00
0.00
0
2,074.00
0.00
80.00
0.00
0
2,074.00
0.00
85.00
0.00
0
2,074.00
0.00
90.00
0.00
0
2,074.00
0.00
95.00
0.00
0
2,074.00
0.00
100.00
0.00
0
2,074.00
0.00
105.00
0.00
0
2,074.00
0.00
110.00
0.00
0
2,074.00
0.00
115.00
0.00
0
2,074.00
0.00
120.00
0.00
0
2,074.00
0.00
125.00
0.00
0
2,074.00
0.00
130.00
0.00
0
2,074.00
0.00
135.00
0.00
0
2,074.00
0.00
140.00
0.00
0
2,074.00
0.00
145.00
0.00
0
2,074.00
0.00
150.00
0.00
0
2,074.00
0.00
155.00
0.00
0
2,074.00
0.00
160.00
0.00
0
2,074.00
0.00
165.00
0.00
0
2,074.00
0.00
170.00
0.00
0
2,074.00
0.00
175.00
0.00
0
2,074.00
0.00
180.00
0.00
0
2,074.00
0.00
185.00
0.00
0
2,074.00
0.00
190.00
0.00
0
2,074.00
0.00
195.00
0.00
0
2,074.00
0.00
200.00
0.00
0
2,074.00
0.00

Mills River Townhomes Type 11 24-hr WQ-BMP #2 Rainfall=1.54"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment Pr D2: Detained #2
Runoff = 5.20 cfs @ 11.96 hrs, Volume= 10,188 cf, Depth= 0.77"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr WQ-BMP #2 Rainfall=1.54"
Area (sf) CN Description
126,729
31,471
98 Unconnected pavement, HSG B
61 >75% Grass cover, Good, HSG B
158,200
91 Weighted Average
31,471
19.89% Pervious Area
126,729
80.11% Impervious Area
126,729
100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment Pr D2: Detained #2
Hydrograph
5.20 cfs
ViQ-BIYIP
#2
ai
pe
fall=
IFA
W-1r
.5
"
Runoff
Vol
Rulof
m
=1
7
11
8
f
c
5.
C
m
=
n
1
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr WQ-BMP #2 Rainfall=1.54"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 13
Hydrograph for Subcatchment Pr D2: Detained #2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.03
0.00
0.00
4.00
0.07
0.00
0.00
6.00
0.12
0.00
0.00
8.00
0.18
0.00
0.00
10.00
0.28
0.01
0.03
12.00
1.02
0.37
4.49
14.00
1.26
0.55
0.17
16.00
1.36
0.62
0.10
18.00
1.42
0.67
0.08
20.00
1.47
0.71
0.06
22.00
1.50
0.74
0.06
24.00
1.54
0.77
0.05
26.00
1.54
0.77
0.00
28.00
1.54
0.77
0.00
30.00
1.54
0.77
0.00
32.00
1.54
0.77
0.00
34.00
1.54
0.77
0.00
36.00
1.54
0.77
0.00
38.00
1.54
0.77
0.00
40.00
1.54
0.77
0.00
42.00
1.54
0.77
0.00
44.00
1.54
0.77
0.00
46.00
1.54
0.77
0.00
48.00
1.54
0.77
0.00
50.00
1.54
0.77
0.00
52.00
1.54
0.77
0.00
54.00
1.54
0.77
0.00
56.00
1.54
0.77
0.00
58.00
1.54
0.77
0.00
60.00
1.54
0.77
0.00
62.00
1.54
0.77
0.00
64.00
1.54
0.77
0.00
66.00
1.54
0.77
0.00
68.00
1.54
0.77
0.00
70.00
1.54
0.77
0.00
72.00
1.54
0.77
0.00
74.00
1.54
0.77
0.00
76.00
1.54
0.77
0.00
78.00
1.54
0.77
0.00
80.00
1.54
0.77
0.00
82.00
1.54
0.77
0.00
84.00
1.54
0.77
0.00
86.00
1.54
0.77
0.00
88.00
1.54
0.77
0.00
90.00
1.54
0.77
0.00
92.00
1.54
0.77
0.00
94.00
1.54
0.77
0.00
96.00
1.54
0.77
0.00
98.00
1.54
0.77
0.00
100.00
1.54
0.77
0.00
102.00
1.54
0.77
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
1.54
0.77
0.00
106.00
1.54
0.77
0.00
108.00
1.54
0.77
0.00
110.00
1.54
0.77
0.00
112.00
1.54
0.77
0.00
114.00
1.54
0.77
0.00
116.00
1.54
0.77
0.00
118.00
1.54
0.77
0.00
120.00
1.54
0.77
0.00
122.00
1.54
0.77
0.00
124.00
1.54
0.77
0.00
126.00
1.54
0.77
0.00
128.00
1.54
0.77
0.00
130.00
1.54
0.77
0.00
132.00
1.54
0.77
0.00
134.00
1.54
0.77
0.00
136.00
1.54
0.77
0.00
138.00
1.54
0.77
0.00
140.00
1.54
0.77
0.00
142.00
1.54
0.77
0.00
144.00
1.54
0.77
0.00
146.00
1.54
0.77
0.00
148.00
1.54
0.77
0.00
150.00
1.54
0.77
0.00
152.00
1.54
0.77
0.00
154.00
1.54
0.77
0.00
156.00
1.54
0.77
0.00
158.00
1.54
0.77
0.00
160.00
1.54
0.77
0.00
162.00
1.54
0.77
0.00
164.00
1.54
0.77
0.00
166.00
1.54
0.77
0.00
168.00
1.54
0.77
0.00
170.00
1.54
0.77
0.00
172.00
1.54
0.77
0.00
174.00
1.54
0.77
0.00
176.00
1.54
0.77
0.00
178.00
1.54
0.77
0.00
180.00
1.54
0.77
0.00
182.00
1.54
0.77
0.00
184.00
1.54
0.77
0.00
186.00
1.54
0.77
0.00
188.00
1.54
0.77
0.00
190.00
1.54
0.77
0.00
192.00
1.54
0.77
0.00
194.00
1.54
0.77
0.00
196.00
1.54
0.77
0.00
198.00
1.54
0.77
0.00
200.00
1.54
0.77
0.00

Mills River Townhomes Type 11 24-hr WQ-BMP #2 Rainfall=1.54"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 14
Summary for Pond BMP #2: StormTech MC-3500
Inflow Area =
158,200 sf,
80.11% Impervious,
Inflow Depth = 0.77" for WQ-BMP #2 event
Inflow =
5.20 cfs @
11.96 hrs, Volume=
10,188 cf
Outflow =
1.18 cfs @
12.10 hrs, Volume=
10,188 cf, Atten= 77%, Lag= 8.1 min
Primary =
1.18 cfs @
12.10 hrs, Volume=
10,188 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,077.52' @ 12.10 hrs Surf.Area= 1,318 sf Storage= 3,184 cf
Flood Elev= 2,080.50' Surf.Area= 1,318 sf Storage= 4,386 cf
Plug -Flow detention time= 25.6 min calculated for 10,187 cf (100% of inflow)
Center -of -Mass det. time= 25.6 min ( 854.6 - 829.0 )
Volume Invert Avail.Storage Storage Description
#1A 2,074.00' 1,908 cf 15.58'W x 84.57'L x 5.50'H Field A
7,248 cf Overall - 2,479 cf Embedded = 4,770 cf x 40.0% Voids
#2A 2,074.75' 2,479 cf ADS _StormTech MC-3500 d +Cap x 22 Inside #1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.171 = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
22 Chambers in 2 Rows
Cap Storaae= +14.9 cf x 2 x 2 rows = 59.6 cf
4,386 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,074.00'
30.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,074.00' / 2,073.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 4.91 sf
#2
Device 1
2,074.00'
3.5" Vert. Orifice X 2.00 C= 0.600
#3
Device 1
2,077.75'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.75
Width (feet) 4.00 4.00
Primary OutFlow Max=1.18 cfs @ 12.10 hrs HW=2,077.52' (Free Discharge)
L1=Culvert (Passes 1.18 cfs of 33.55 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 1.18 cfs @ 8.85 fps)
( Controls 0.00 cfs)

Mills River Townhomes Type 11 24-hr WQ-BMP #2 Rainfall=1.54"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 15
5
4
N
3
3
0
LL
2
1
0
0
Pond BMP #2: StormTech MC-3500
Hyd rog raph
5.20 cfs
eklv2,7.5'
Alwa=
t
rage
318
f
1.18
cfs
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Inflow
Primary

Mills River Townhomes
Type 11 24-hr WQ-BMP #2 Rainfall=1.54"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 16
Hydrograph for Pond BMP #2: StormTech MC-3500
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,074.00
0.00
5.00
0.00
0
2,074.00
0.00
10.00
0.03
33
2,074.06
0.02
15.00
0.13
101
2,074.19
0.14
20.00
0.06
63
2,074.12
0.06
25.00
0.00
8
2,074.01
0.00
30.00
0.00
0
2,074.00
0.00
35.00
0.00
0
2,074.00
0.00
40.00
0.00
0
2,074.00
0.00
45.00
0.00
0
2,074.00
0.00
50.00
0.00
0
2,074.00
0.00
55.00
0.00
0
2,074.00
0.00
60.00
0.00
0
2,074.00
0.00
65.00
0.00
0
2,074.00
0.00
70.00
0.00
0
2,074.00
0.00
75.00
0.00
0
2,074.00
0.00
80.00
0.00
0
2,074.00
0.00
85.00
0.00
0
2,074.00
0.00
90.00
0.00
0
2,074.00
0.00
95.00
0.00
0
2,074.00
0.00
100.00
0.00
0
2,074.00
0.00
105.00
0.00
0
2,074.00
0.00
110.00
0.00
0
2,074.00
0.00
115.00
0.00
0
2,074.00
0.00
120.00
0.00
0
2,074.00
0.00
125.00
0.00
0
2,074.00
0.00
130.00
0.00
0
2,074.00
0.00
135.00
0.00
0
2,074.00
0.00
140.00
0.00
0
2,074.00
0.00
145.00
0.00
0
2,074.00
0.00
150.00
0.00
0
2,074.00
0.00
155.00
0.00
0
2,074.00
0.00
160.00
0.00
0
2,074.00
0.00
165.00
0.00
0
2,074.00
0.00
170.00
0.00
0
2,074.00
0.00
175.00
0.00
0
2,074.00
0.00
180.00
0.00
0
2,074.00
0.00
185.00
0.00
0
2,074.00
0.00
190.00
0.00
0
2,074.00
0.00
195.00
0.00
0
2,074.00
0.00
200.00
0.00
0
2,074.00
0.00

//fic)STIVI
Advanced Drainage Systems, Inc.
Mills River Townhornes BMP #3
Mills River- NC
BAYSAVER BAYFILTER SPECIFICATIONS
PRODUCTS
A. INTERNAL COMPONENTS: ALL COMPONENTS INCLUDING CONCRETE STRUCTURE(S), PVC MANIFOLD PIPING AND FILTER CARTRIDGES,
SHALL BE PROVIDED BY BAYSAVER TECHNOLOGIES LLC, 1030 DEER HOLLOW DRIVE, MOUNTAIRY, MD (800.229.7283).
B. PVC MANIFOLD PIPING: ALL INTERNAL PVC PIPE AND FITTINGS SHALL MEET ASTM D1785. MANIFOLD PIPING SHALL BE PROVIDED TO THE
CONTRACTOR PARTIALLY PRE-CUTAND PRE -ASSEMBLED.
C. FILTER CARTRIDGES: EXTERNAL SHELL OF THE FILTER CARTRIDGES SHALL BE SUBSTANTIALLY CONSTRUCTED OF POLYETHYLENE OR
EQUIVALENT MATERIAL ACCEPTABLE TO THE MANUFACTURER. FILTRATION MEDIA SHALL BE ARRANGED IN A SPIRAL LAYERED FASHION
TO MAXIMIZE AVAILABLE FILTRATION AREA. AN ORIFICE PLATE SHALL BE SUPPLIED WITH EACH CARTRIDGE TO RESTRICT THE FLOW RATE
TOAMAXIMUM OF45GPM.
D. FILTER MEDIA: FILTER MEDIA SHALL BE BY BAYSAVER TECHNOLOGIES LLC AND SHALL CONSIST OF THE FOLLOWING MIX: A BLEND OF
ZEOLITE, PERLITE AND ACTIVATED ALUMINA.
E. PRECAST CONCRETE VAULT: CONCRETE STRUCTURES SHALL BE PROVIDED ACCORDING TO ASTM C. THE MATERIALS AND STRUCTURAL
DESIGN OF THE DEVICES SHALL BE PER ASTM C478, C857 AND C858. PRECAST CONCRETE SHALL BE PROVIDED BY BAYSAVER
TECHNOLOGIES, LLC.
PERFORMANCE
A. THE STORMWATER FILTER SYSTEM SHALL BEAN OFFLINE DESIGN CAPABLE OFTREATING 100%OFTHE REQUIRED TREATMENT FLOWAT
FULLSEDIMENT LOAD CONDITIONS.
B. THE STORMWATER FILTER SYSTEM'S CARTRIDGES SHALL HAVE NO MOVING PARTS.
C. THE STORMWATER TREATMENT UNIT SHALL BE DESIGNED TO REMOVE AT LEAST 85% OF SUSPENDED SOLIDS, 65% OF TOTAL
PHOSPHORUS, 65% OF TURBIDITY, 40% OFTOTAL COPPER, AND 40% OF TOTAL ZINC BASED ON FIELD DATA COLLECTED IN COMPLIANCE
WITH THE TECHNOLOGY ACCEPTANCE RECIPROCITY PARTNERSHIPTIER IITEST PROTOCOL.
D. THE STORMWATER FILTRATION SYSTEM SHALL REDUCE INCOMING TURBIDITY (MEASURED AS NTUs) BY 50% OR MOREAND SHALL NOT
HAVE ANY COMPONENTS THAT LEACH NITRATES OR PHOSPHATES.
E. THE STORMWATER FILTRATION CARTRIDGE SHALL BE EQUIPPED WITH A HYDRODYNAMIC BACKWASH MECHANISM TO EXTEND THE
FILTER'S LIFEAND OPTIMIZE ITS PERFORMANCE.
F. THE STORMWATER FILTRATION SYSTEM SHALL BE DESIGNED TO REMOVE A MINIMUM OF 65% OFTHE INCOMING TOTAL PHOSPHORUS
(TP) LOAD.
G. THE STORMWATER FILTRATION SYSTEM'S CARTRIDGES SHALL HAVE A TREATED SEDIMENT CAPACITY FOR 80%TSS REMOVAL BETWEEN
150-350LBS.
BAYFILTER MAINTENANCE
THE BAYFILTER SYSTEM REQUIRES PERIODIC MAINTENANCE TO CONTINUE OPERATING AT ITS PEAK EFFICIENCY DESIGN. THE MAINTENANCE
PROCESS COMPRISES THE REMOVAL AND REPLACEMENT OF EACH BAYFILTER CARTRIDGE AND THE CLEANING OF THE VAULT OR MANHOLE WITH A
VACUUM TRUCK. FOR BEST RESULTS, BAYFILTER MAINTENANCE SHOULD BE PERFORMED BY A CERTIFIED MAINTENANCE CONTRACTOR. A QUICK
CALL TO AN ADS ENGINEER OR CUSTOMER SERVICE REPRESENTATIVE WILL PROVIDE YOU WITH A LIST OF RELIABLE CONTRACTORS IN YOUR AREA.
WHEN BAYFILTER IS INITIALLY INSTALLED, WE RECOMMEND THAT AN INSPECTION BE PERFORMED ON THE SYSTEM IN THE FIRST SIX (6) MONTHS.
AFTER THAT, THE INSPECTION CYCLE TYPICALLY FALLS INTO A BIANNUAL PATTERN GIVEN NORMAL STORM OCCURRENCE AND ACTUAL SOLIDS
LOADS.
WHEN BAYFILTER EXHIBITS FLOWS BELOW DESIGN LEVELS, THE SYSTEM SHOULD BE INSPECTED AND MAINTAINED AS SOON AS PRACTICAL.
REPLACING A BAYFILTER CARTRIDGE SHOULD BE CONSIDERED AT ORABOVE THE LEVEL OF THE MANIFOLD.
MAINTENANCE PROCEDURES
1. REMOVE THE MANHOLE COVERS AND OPEN ALLACCESS HATCHES.
2. BEFORE ENTERING THE SYSTEM MAKE SURE THE AIR IS SAFE PER OSHA STANDARDS OR USE BREATHING APPARATUS. USE LOW 02, HIGH
CO, OR OTHER APPLICABLE WARNING DEVICES PER REGULATORY REQUIREMENTS.
3. USING A VACUUM TRUCK, REMOVE ANY LIQUID AND SEDIMENTS THAT CAN BE REMOVED PRIOR TO ENTRY.
4. USING A SMALL LIFT OR THE BOOM OF THE VACUUM TRUCK, REMOVE THE USED CARTRIDGES BY LIFTING THEM OUT.
5. ANY CARTRIDGES THAT CANNOT BE READILY LIFTED CAN BE EASILY SLID ALONG THE FLOOR TO A LOCATION THEY CAN BE LIFTED VIA BOOM
LIFT.
6. WHEN ALL THE CARTRIDGES HAVE BEEN REMOVED, IT IS NOW PRACTICAL TO REMOVE THE BALANCE OF THE SOLIDS AND WATER. LOOSEN THE
STAINLESS CLAMPS ON THE FERNCO COUPLINGS FOR THE MANIFOLD AND REMOVE THE DRAINPIPES AS WELL. CAREFULLY CAP THE MANIFOLD
AND THE FERNCO'S AND RINSE THE FLOOR, WASHING AWAY THE BALANCE OFANY REMAINING COLLECTED SOLIDS.
7. CLEAN THE MANIFOLD PIPES, INSPECT, AND REINSTALL.
8. INSTALLTHE EXCHANGE CARTRIDGES AND CLOSE ALL COVERS.
9. THE USED CARTRIDGES MUST BE SENT BACK TO ADS FOR EXCHANGE/RECYCLING AND CREDIT ON UNDAMAGED UNITS.
BAYFILTER INSTALLATION NOTES
1. CONTACT UTILITY LOCATOR TO MARKANY NEARBY UNDERGROUND UTILITIES AND MAKE SURE ITISSAFETO EXCAVATE.
2. REFERENCE THE SITE PLAN AND STAKE OUT THE LOCATION OFTHE BAYFILTER VAULT.
3. EXCAVATE THE HOLE, PROVIDING ANY SHEETING AND SHORING NECESSARY TO COMPLY WITH ALL FEDERAL, STATE AND LOCALSAFETY
REGULATIONS.
4. LEVELTHE SUB- GRADE TO THE PROPER ELEVATION. VERIFY THE ELEVATION AGAINST THE MANHOLE DIMENSIONS, THE INVERT ELEVATIONS,
AND THE SITE PLANS. ADJUST THE BASE AGGREGATE, IFNECESSARY.
5. HAVE THE SOIL BEARING CAPACITY VERIFIED BYA LICENSED/ENGINEER FOR THE REQUIRED LOAD BEARING CAPACITY. ON SOLID SUB- GRADE,
SET THE FIRST SECTION OF THE BAYFILTER PRE --CAST VAULT.
6. CHECK THE LEVELAND ELEVATION OF THE FIRST SECTION TO ENSURE IT IS CORRECT BEFORE ADDING ANY RISER SECTIONS.
7. IFADDITIONAL SECTION(S)ARE REQUIRED, ADD A WATERTIGHT SEAL TO THE FIRST SECTION OFTHE BAYFILTER VAULT. SET ADDITIONAL
SECTION(S) OF THE VAULT, ADDING A WATERTIGHT SEAL TO EACH JOINT.
8. INSTALL THE PVC OUTLET MANIFOLD.
9. INSTALL THE PVC OUTLET PIPE IN BAYFILTER VAULT.
10. INSTALL THE INLET PIPE TO THE BAYFILTER VAULT.
11. AFTER THE SITE IS STABILIZED, REMOVE ANY ACCUMULATED SEDIMENT OR DEBRIS FROM THE VAULT AND INSTALL THE FLOW DISKS,
DRAINDOWN MODULES (IFAPPLICABLE), AND THE BAYFILTER CARTRIDGES.
12. PLACE FULL SET OF HOLD DOWN BARS AND BRACKETS INTO PLACE.
2021 ADS, INC.

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`
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2 SHEET
OF

///ADS,.
Mills River Townhomes BMP #3
BAYFILTER 545 - 13x6x6.67ft BILL OF MATERIALS
PART NUMBER
QUANTITY
DESCRIPTION
1
6
6-IN PVC TEE WITH 1.5-
IN FLOWDISK
2
1
6-IN PVC TEE
3
6
24" L X 6" D PVC STUB
4
6
545 CARTRIDGES
5
1
DRAINDOWN
6
1
OUTLET PIPE
7
1
INLET PIPE
8
1
6-IN FLEXIBLE COUPLER
9
1
6-IN PVC (8 INCHES)
10
3
HOLD DOWN BAR (6
FEET)
11
1
TROLLEY SYSTEM
12
7
6-IN PVC PLUG

r DD)3
Detained #3
Z4; #3
StormTech MC-3500
Subcat Reach on Link Routing Diagram for Mills River Townhomes
Prepared by {enter your company name here}, Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC

Mills River Townhomes Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment Pr D3: Detained #3
Runoff = 17.80 cfs @ 11.96 hrs, Volume= 35,348 cf, Depth= 2.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.10"
Area (sf) CN Description
100,029
42,298
98 Unconnected pavement, HSG A
39 >75% Grass cover, Good, HSG A
142,327
80 Weighted Average
42,298
29.72% Pervious Area
100,029
70.28% Impervious Area
100,029
100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment Pr D3: Detained #3
Hydrograph
9
17.80 cfs
8
'—:Type
6
-
r
5
3
2
Rijn
ffAkrea=14
3
7
Rw
1
0
c=
m
n
7
6
5
4
3
2
1
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 3
Hydrograph for Subcatchment Pr D3: Detained #3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.11
0.00
0.00
4.00
0.24
0.00
0.00
6.00
0.41
0.00
0.00
8.00
0.61
0.00
0.03
10.00
0.92
0.06
0.17
12.00
3.38
1.54
15.19
14.00
4.18
2.19
0.54
16.00
4.49
2.45
0.34
18.00
4.70
2.63
0.26
20.00
4.86
2.77
0.19
22.00
4.98
2.88
0.18
24.00
5.10
2.98
0.16
26.00
5.10
2.98
0.00
28.00
5.10
2.98
0.00
30.00
5.10
2.98
0.00
32.00
5.10
2.98
0.00
34.00
5.10
2.98
0.00
36.00
5.10
2.98
0.00
38.00
5.10
2.98
0.00
40.00
5.10
2.98
0.00
42.00
5.10
2.98
0.00
44.00
5.10
2.98
0.00
46.00
5.10
2.98
0.00
48.00
5.10
2.98
0.00
50.00
5.10
2.98
0.00
52.00
5.10
2.98
0.00
54.00
5.10
2.98
0.00
56.00
5.10
2.98
0.00
58.00
5.10
2.98
0.00
60.00
5.10
2.98
0.00
62.00
5.10
2.98
0.00
64.00
5.10
2.98
0.00
66.00
5.10
2.98
0.00
68.00
5.10
2.98
0.00
70.00
5.10
2.98
0.00
72.00
5.10
2.98
0.00
74.00
5.10
2.98
0.00
76.00
5.10
2.98
0.00
78.00
5.10
2.98
0.00
80.00
5.10
2.98
0.00
82.00
5.10
2.98
0.00
84.00
5.10
2.98
0.00
86.00
5.10
2.98
0.00
88.00
5.10
2.98
0.00
90.00
5.10
2.98
0.00
92.00
5.10
2.98
0.00
94.00
5.10
2.98
0.00
96.00
5.10
2.98
0.00
98.00
5.10
2.98
0.00
100.00
5.10
2.98
0.00
102.00
5.10
2.98
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
5.10
2.98
0.00
106.00
5.10
2.98
0.00
108.00
5.10
2.98
0.00
110.00
5.10
2.98
0.00
112.00
5.10
2.98
0.00
114.00
5.10
2.98
0.00
116.00
5.10
2.98
0.00
118.00
5.10
2.98
0.00
120.00
5.10
2.98
0.00
122.00
5.10
2.98
0.00
124.00
5.10
2.98
0.00
126.00
5.10
2.98
0.00
128.00
5.10
2.98
0.00
130.00
5.10
2.98
0.00
132.00
5.10
2.98
0.00
134.00
5.10
2.98
0.00
136.00
5.10
2.98
0.00
138.00
5.10
2.98
0.00
140.00
5.10
2.98
0.00
142.00
5.10
2.98
0.00
144.00
5.10
2.98
0.00
146.00
5.10
2.98
0.00
148.00
5.10
2.98
0.00
150.00
5.10
2.98
0.00
152.00
5.10
2.98
0.00
154.00
5.10
2.98
0.00
156.00
5.10
2.98
0.00
158.00
5.10
2.98
0.00
160.00
5.10
2.98
0.00
162.00
5.10
2.98
0.00
164.00
5.10
2.98
0.00
166.00
5.10
2.98
0.00
168.00
5.10
2.98
0.00
170.00
5.10
2.98
0.00
172.00
5.10
2.98
0.00
174.00
5.10
2.98
0.00
176.00
5.10
2.98
0.00
178.00
5.10
2.98
0.00
180.00
5.10
2.98
0.00
182.00
5.10
2.98
0.00
184.00
5.10
2.98
0.00
186.00
5.10
2.98
0.00
188.00
5.10
2.98
0.00
190.00
5.10
2.98
0.00
192.00
5.10
2.98
0.00
194.00
5.10
2.98
0.00
196.00
5.10
2.98
0.00
198.00
5.10
2.98
0.00
200.00
5.10
2.98
0.00

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 4
Summary for Pond BMP #3: StormTech MC-3500
Inflow Area =
142,327 sf,
70.28% Impervious,
Inflow Depth = 2.98" for 10-Year event
Inflow =
17.80 cfs @
11.96 hrs, Volume=
35,348 cf
Outflow =
17.72 cfs @
11.97 hrs, Volume=
35,347 cf, Atten= 0%, Lag= 0.3 min
Primary =
17.72 cfs @
11.97 hrs, Volume=
35,347 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,078.69' @ 11.97 hrs Surf.Area= 1,134 sf Storage= 3,334 cf
Flood Elev= 2,080.50' Surf.Area= 1,134 sf Storage= 3,701 cf
Plug -Flow detention time= 28.9 min calculated for 35,345 cf (100% of inflow)
Center -of -Mass det. time= 28.9 min ( 845.8 - 816.9 )
Volume Invert Avail.Storage Storage Description
#1A 2,074.00' 1,692 cf 8.42'W x 134.76'L x 5.50'H Field A
6,238 cf Overall - 2,009 cf Embedded = 4,229 cf x 40.0% Voids
#2A 2,074.75' 2,009 cf ADS _StormTech MC-3500 d +Cap x 18 Inside #1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.171 = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
Cap Storage= +14.9 cf x 2 x 1 rows = 29.8 cf
3,701 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,074.00'
30.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,074.00' / 2,073.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 4.91 sf
#2
Device 1
2,074.00'
3.5" Vert. Orifice C= 0.600
#3
Device 1
2,077.50'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 2.00
Width (feet) 4.00 4.00
Primary OutFlow Max=17.68 cfs @ 11.97 hrs HW=2,078.69' (Free Discharge)
L1=Culvert (Passes 17.68 cfs of 43.83 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 0.69 cfs @ 10.26 fps)
(Weir Controls 16.99 cfs @ 3.57 fps)

Mills River Townhomes Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 5
1
1
1
1
1
1
1
1
N 1
U
3 1
0
LL
Pond BMP #3: StormTech MC-3500
Hyd rog raph
9
17.72 cfs
8
'
6
e
=
5
4
1
3
2
1
0
9
8
7
6
5
4
3
2
1
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Inflow
Primary

Mills River Townhomes
Type 11 24-hr 10-Year Rainfall=5.10"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 6
Hydrograph for Pond BMP #3: StormTech MC-3500
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,074.00
0.00
5.00
0.00
0
2,074.00
0.00
10.00
0.17
150
2,074.33
0.14
15.00
0.43
2,326
2,077.06
0.55
20.00
0.19
364
2,074.78
0.26
25.00
0.00
26
2,074.06
0.01
30.00
0.00
0
2,074.00
0.00
35.00
0.00
0
2,074.00
0.00
40.00
0.00
0
2,074.00
0.00
45.00
0.00
0
2,074.00
0.00
50.00
0.00
0
2,074.00
0.00
55.00
0.00
0
2,074.00
0.00
60.00
0.00
0
2,074.00
0.00
65.00
0.00
0
2,074.00
0.00
70.00
0.00
0
2,074.00
0.00
75.00
0.00
0
2,074.00
0.00
80.00
0.00
0
2,074.00
0.00
85.00
0.00
0
2,074.00
0.00
90.00
0.00
0
2,074.00
0.00
95.00
0.00
0
2,074.00
0.00
100.00
0.00
0
2,074.00
0.00
105.00
0.00
0
2,074.00
0.00
110.00
0.00
0
2,074.00
0.00
115.00
0.00
0
2,074.00
0.00
120.00
0.00
0
2,074.00
0.00
125.00
0.00
0
2,074.00
0.00
130.00
0.00
0
2,074.00
0.00
135.00
0.00
0
2,074.00
0.00
140.00
0.00
0
2,074.00
0.00
145.00
0.00
0
2,074.00
0.00
150.00
0.00
0
2,074.00
0.00
155.00
0.00
0
2,074.00
0.00
160.00
0.00
0
2,074.00
0.00
165.00
0.00
0
2,074.00
0.00
170.00
0.00
0
2,074.00
0.00
175.00
0.00
0
2,074.00
0.00
180.00
0.00
0
2,074.00
0.00
185.00
0.00
0
2,074.00
0.00
190.00
0.00
0
2,074.00
0.00
195.00
0.00
0
2,074.00
0.00
200.00
0.00
0
2,074.00
0.00

Mills River Townhomes Type 11 24-hr 25-Year Rainfall=6. 01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment Pr D3: Detained #3
Runoff = 22.40 cfs @ 11.96 hrs, Volume= 44,955 cf, Depth= 3.79"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.01"
Area (sf) CN Description
100,029
42,298
98 Unconnected pavement, HSG A
39 >75% Grass cover, Good, HSG A
142,327
80 Weighted Average
42,298
29.72% Pervious Area
100,029
70.28% Impervious Area
100,029
100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
N
U
3
0
LL
22.40 cfs
w
to
Subcatchment Pr D3: Detained #3
Hydrograph
U IU LU JU 4U UU OU /U OU .7U IUU IIU ILU IJU 14U IUU IOU I/U IOU 1.7U LUU
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 8
Hydrograph for Subcatchment Pr D3: Detained #3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.13
0.00
0.00
4.00
0.29
0.00
0.00
6.00
0.48
0.00
0.00
8.00
0.72
0.02
0.06
10.00
1.09
0.11
0.26
12.00
3.98
2.03
19.00
14.00
4.93
2.83
0.66
16.00
5.29
3.15
0.41
18.00
5.54
3.36
0.32
20.00
5.72
3.53
0.23
22.00
5.87
3.67
0.21
24.00
6.01
3.79
0.20
26.00
6.01
3.79
0.00
28.00
6.01
3.79
0.00
30.00
6.01
3.79
0.00
32.00
6.01
3.79
0.00
34.00
6.01
3.79
0.00
36.00
6.01
3.79
0.00
38.00
6.01
3.79
0.00
40.00
6.01
3.79
0.00
42.00
6.01
3.79
0.00
44.00
6.01
3.79
0.00
46.00
6.01
3.79
0.00
48.00
6.01
3.79
0.00
50.00
6.01
3.79
0.00
52.00
6.01
3.79
0.00
54.00
6.01
3.79
0.00
56.00
6.01
3.79
0.00
58.00
6.01
3.79
0.00
60.00
6.01
3.79
0.00
62.00
6.01
3.79
0.00
64.00
6.01
3.79
0.00
66.00
6.01
3.79
0.00
68.00
6.01
3.79
0.00
70.00
6.01
3.79
0.00
72.00
6.01
3.79
0.00
74.00
6.01
3.79
0.00
76.00
6.01
3.79
0.00
78.00
6.01
3.79
0.00
80.00
6.01
3.79
0.00
82.00
6.01
3.79
0.00
84.00
6.01
3.79
0.00
86.00
6.01
3.79
0.00
88.00
6.01
3.79
0.00
90.00
6.01
3.79
0.00
92.00
6.01
3.79
0.00
94.00
6.01
3.79
0.00
96.00
6.01
3.79
0.00
98.00
6.01
3.79
0.00
100.00
6.01
3.79
0.00
102.00
6.01
3.79
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
6.01
3.79
0.00
106.00
6.01
3.79
0.00
108.00
6.01
3.79
0.00
110.00
6.01
3.79
0.00
112.00
6.01
3.79
0.00
114.00
6.01
3.79
0.00
116.00
6.01
3.79
0.00
118.00
6.01
3.79
0.00
120.00
6.01
3.79
0.00
122.00
6.01
3.79
0.00
124.00
6.01
3.79
0.00
126.00
6.01
3.79
0.00
128.00
6.01
3.79
0.00
130.00
6.01
3.79
0.00
132.00
6.01
3.79
0.00
134.00
6.01
3.79
0.00
136.00
6.01
3.79
0.00
138.00
6.01
3.79
0.00
140.00
6.01
3.79
0.00
142.00
6.01
3.79
0.00
144.00
6.01
3.79
0.00
146.00
6.01
3.79
0.00
148.00
6.01
3.79
0.00
150.00
6.01
3.79
0.00
152.00
6.01
3.79
0.00
154.00
6.01
3.79
0.00
156.00
6.01
3.79
0.00
158.00
6.01
3.79
0.00
160.00
6.01
3.79
0.00
162.00
6.01
3.79
0.00
164.00
6.01
3.79
0.00
166.00
6.01
3.79
0.00
168.00
6.01
3.79
0.00
170.00
6.01
3.79
0.00
172.00
6.01
3.79
0.00
174.00
6.01
3.79
0.00
176.00
6.01
3.79
0.00
178.00
6.01
3.79
0.00
180.00
6.01
3.79
0.00
182.00
6.01
3.79
0.00
184.00
6.01
3.79
0.00
186.00
6.01
3.79
0.00
188.00
6.01
3.79
0.00
190.00
6.01
3.79
0.00
192.00
6.01
3.79
0.00
194.00
6.01
3.79
0.00
196.00
6.01
3.79
0.00
198.00
6.01
3.79
0.00
200.00
6.01
3.79
0.00

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 9
Summary for Pond BMP #3: StormTech MC-3500
Inflow Area =
142,327 sf,
70.28% Impervious,
Inflow Depth = 3.79" for 25-Year event
Inflow =
22.40 cfs @
11.96 hrs, Volume=
44,955 cf
Outflow =
22.31 cfs @
11.97 hrs, Volume=
44,955 cf, Atten= 0%, Lag= 0.3 min
Primary =
22.31 cfs @
11.97 hrs, Volume=
44,955 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,078.90' @ 11.97 hrs Surf.Area= 1,134 sf Storage= 3,427 cf
Flood Elev= 2,080.50' Surf.Area= 1,134 sf Storage= 3,701 cf
Plug -Flow detention time= 27.6 min calculated for 44,953 cf (100% of inflow)
Center -of -Mass det. time= 27.6 min ( 837.6 - 810.1 )
Volume Invert Avail.Storage Storage Description
#1A 2,074.00' 1,692 cf 8.42'W x 134.76'L x 5.50'H Field A
6,238 cf Overall - 2,009 cf Embedded = 4,229 cf x 40.0% Voids
#2A 2,074.75' 2,009 cf ADS _StormTech MC-3500 d +Cap x 18 Inside #1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.171 = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
Cap Storage= +14.9 cf x 2 x 1 rows = 29.8 cf
3,701 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,074.00'
30.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,074.00' / 2,073.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 4.91 sf
#2
Device 1
2,074.00'
3.5" Vert. Orifice C= 0.600
#3
Device 1
2,077.50'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 2.00
Width (feet) 4.00 4.00
Primary OutFlow Max=22.25 cfs @ 11.97 hrs HW=2,078.89' (Free Discharge)
L1=Culvert (Passes 22.25 cfs of 45.11 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 0.70 cfs @ 10.49 fps)
(Weir Controls 21.55 cfs @ 3.87 fps)

Mills River Townhomes Type 11 24-hr 25-Year Rainfall=6. 01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 10
Pond BMP #3: StormTech MC-3500
Hyd rog raph
0
4
3 22.31 cfs
2
1
0
9
8
7
6
_
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Inflow
Primary

Mills River Townhomes
Type 11 24-hr 25-Year Rainfall=6.01 "
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 11
Hydrograph for Pond BMP #3: StormTech MC-3500
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,074.00
0.00
5.00
0.00
0
2,074.00
0.00
10.00
0.26
246
2,074.54
0.20
15.00
0.53
2,610
2,077.43
0.58
20.00
0.23
690
2,075.14
0.32
25.00
0.00
28
2,074.06
0.01
30.00
0.00
0
2,074.00
0.00
35.00
0.00
0
2,074.00
0.00
40.00
0.00
0
2,074.00
0.00
45.00
0.00
0
2,074.00
0.00
50.00
0.00
0
2,074.00
0.00
55.00
0.00
0
2,074.00
0.00
60.00
0.00
0
2,074.00
0.00
65.00
0.00
0
2,074.00
0.00
70.00
0.00
0
2,074.00
0.00
75.00
0.00
0
2,074.00
0.00
80.00
0.00
0
2,074.00
0.00
85.00
0.00
0
2,074.00
0.00
90.00
0.00
0
2,074.00
0.00
95.00
0.00
0
2,074.00
0.00
100.00
0.00
0
2,074.00
0.00
105.00
0.00
0
2,074.00
0.00
110.00
0.00
0
2,074.00
0.00
115.00
0.00
0
2,074.00
0.00
120.00
0.00
0
2,074.00
0.00
125.00
0.00
0
2,074.00
0.00
130.00
0.00
0
2,074.00
0.00
135.00
0.00
0
2,074.00
0.00
140.00
0.00
0
2,074.00
0.00
145.00
0.00
0
2,074.00
0.00
150.00
0.00
0
2,074.00
0.00
155.00
0.00
0
2,074.00
0.00
160.00
0.00
0
2,074.00
0.00
165.00
0.00
0
2,074.00
0.00
170.00
0.00
0
2,074.00
0.00
175.00
0.00
0
2,074.00
0.00
180.00
0.00
0
2,074.00
0.00
185.00
0.00
0
2,074.00
0.00
190.00
0.00
0
2,074.00
0.00
195.00
0.00
0
2,074.00
0.00
200.00
0.00
0
2,074.00
0.00

Mills River Townhomes Type 11 24-hr WQ-BMP #3 Rainfall=2.20"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment Pr D3: Detained #3
Runoff = 4.14 cfs @ 11.97 hrs, Volume= 8,161 cf, Depth= 0.69"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs
Type II 24-hr WQ-BMP #3 Rainfall=2.20"
Area (sf) CN Description
100,029
42,298
98 Unconnected pavement, HSG A
39 >75% Grass cover, Good, HSG A
142,327
80 Weighted Average
42,298
29.72% Pervious Area
100,029
70.28% Impervious Area
100,029
100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment Pr D3: Detained #3
Hydrograph
4.14 cfs
ViQ-BIYIP
u
1
off
3
Ara
I y
Rainfall=
pe
14
11 2.4-hr
,3
.2
7
"
f
Run
ff
Runoff
olu
D
e=
pt
,1
=
1
.6
f
"
C
-
0
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
— Runoff

Mills River Townhomes
Type 11 24-hr WQ-BMP #3 Rainfall=2.20"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 13
Hydrograph for Subcatchment Pr D3: Detained #3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
2.00
0.05
0.00
0.00
4.00
0.11
0.00
0.00
6.00
0.18
0.00
0.00
8.00
0.26
0.00
0.00
10.00
0.40
0.00
0.00
12.00
1.46
0.27
3.70
14.00
1.80
0.45
0.16
16.00
1.94
0.52
0.10
18.00
2.03
0.58
0.08
20.00
2.09
0.62
0.06
22.00
2.15
0.66
0.06
24.00
2.20
0.69
0.05
26.00
2.20
0.69
0.00
28.00
2.20
0.69
0.00
30.00
2.20
0.69
0.00
32.00
2.20
0.69
0.00
34.00
2.20
0.69
0.00
36.00
2.20
0.69
0.00
38.00
2.20
0.69
0.00
40.00
2.20
0.69
0.00
42.00
2.20
0.69
0.00
44.00
2.20
0.69
0.00
46.00
2.20
0.69
0.00
48.00
2.20
0.69
0.00
50.00
2.20
0.69
0.00
52.00
2.20
0.69
0.00
54.00
2.20
0.69
0.00
56.00
2.20
0.69
0.00
58.00
2.20
0.69
0.00
60.00
2.20
0.69
0.00
62.00
2.20
0.69
0.00
64.00
2.20
0.69
0.00
66.00
2.20
0.69
0.00
68.00
2.20
0.69
0.00
70.00
2.20
0.69
0.00
72.00
2.20
0.69
0.00
74.00
2.20
0.69
0.00
76.00
2.20
0.69
0.00
78.00
2.20
0.69
0.00
80.00
2.20
0.69
0.00
82.00
2.20
0.69
0.00
84.00
2.20
0.69
0.00
86.00
2.20
0.69
0.00
88.00
2.20
0.69
0.00
90.00
2.20
0.69
0.00
92.00
2.20
0.69
0.00
94.00
2.20
0.69
0.00
96.00
2.20
0.69
0.00
98.00
2.20
0.69
0.00
100.00
2.20
0.69
0.00
102.00
2.20
0.69
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
104.00
2.20
0.69
0.00
106.00
2.20
0.69
0.00
108.00
2.20
0.69
0.00
110.00
2.20
0.69
0.00
112.00
2.20
0.69
0.00
114.00
2.20
0.69
0.00
116.00
2.20
0.69
0.00
118.00
2.20
0.69
0.00
120.00
2.20
0.69
0.00
122.00
2.20
0.69
0.00
124.00
2.20
0.69
0.00
126.00
2.20
0.69
0.00
128.00
2.20
0.69
0.00
130.00
2.20
0.69
0.00
132.00
2.20
0.69
0.00
134.00
2.20
0.69
0.00
136.00
2.20
0.69
0.00
138.00
2.20
0.69
0.00
140.00
2.20
0.69
0.00
142.00
2.20
0.69
0.00
144.00
2.20
0.69
0.00
146.00
2.20
0.69
0.00
148.00
2.20
0.69
0.00
150.00
2.20
0.69
0.00
152.00
2.20
0.69
0.00
154.00
2.20
0.69
0.00
156.00
2.20
0.69
0.00
158.00
2.20
0.69
0.00
160.00
2.20
0.69
0.00
162.00
2.20
0.69
0.00
164.00
2.20
0.69
0.00
166.00
2.20
0.69
0.00
168.00
2.20
0.69
0.00
170.00
2.20
0.69
0.00
172.00
2.20
0.69
0.00
174.00
2.20
0.69
0.00
176.00
2.20
0.69
0.00
178.00
2.20
0.69
0.00
180.00
2.20
0.69
0.00
182.00
2.20
0.69
0.00
184.00
2.20
0.69
0.00
186.00
2.20
0.69
0.00
188.00
2.20
0.69
0.00
190.00
2.20
0.69
0.00
192.00
2.20
0.69
0.00
194.00
2.20
0.69
0.00
196.00
2.20
0.69
0.00
198.00
2.20
0.69
0.00
200.00
2.20
0.69
0.00

Mills River Townhomes
Type 11 24-hr WQ-BMP #3 Rainfall=2.20"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 14
Summary for Pond BMP #3: StormTech MC-3500
Inflow Area =
142,327 sf,
70.28% Impervious,
Inflow Depth = 0.69" for WQ-BMP #3 event
Inflow =
4.14 cfs @
11.97 hrs, Volume=
8,161 cf
Outflow =
0.60 cfs @
12.23 hrs, Volume=
8,161 cf, Atten= 86%, Lag= 15.9 min
Primary =
0.60 cfs @
12.23 hrs, Volume=
8,161 cf
Routing by Stor-Ind method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs / 2
Peak Elev= 2,077.51' @ 12.23 hrs Surf.Area= 1,134 sf Storage= 2,662 cf
Flood Elev= 2,080.50' Surf.Area= 1,134 sf Storage= 3,701 cf
Plug -Flow detention time= 45.5 min calculated for 8,161 cf (100% of inflow)
Center -of -Mass det. time= 45.5 min ( 905.5 - 860.0 )
Volume Invert Avail.Storage Storage Description
#1A 2,074.00' 1,692 cf 8.42'W x 134.76'L x 5.50'H Field A
6,238 cf Overall - 2,009 cf Embedded = 4,229 cf x 40.0% Voids
#2A 2,074.75' 2,009 cf ADS _StormTech MC-3500 d +Cap x 18 Inside #1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.171 = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
Cap Storage= +14.9 cf x 2 x 1 rows = 29.8 cf
3,701 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
2,074.00'
30.0" Round Culvert
L= 5.0' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 2,074.00' / 2,073.90' S= 0.0200 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior, Flow Area= 4.91 sf
#2
Device 1
2,074.00'
3.5" Vert. Orifice C= 0.600
#3
Device 1
2,077.50'
Weir, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 2.00
Width (feet) 4.00 4.00
Primary OutFlow Max=0.60 cfs @ 12.23 hrs HW=2,077.51' (Free Discharge)
L1=Culvert (Passes 0.60 cfs of 33.31 cfs potential flow)
�__3=Weir
2=Orifice (Orifice Controls 0.59 cfs @ 8.83 fps)
(Weir Controls 0.01 cfs @ 0.24 fps)

Mills River Townhomes Type 11 24-hr WQ-BMP #3 Rainfall=2.20"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 15
Pond BMP #3: StormTech MC-3500
Hyd rog raph
4.14 cfs
4 e a = 4 7
eklv2,7.5'
3
2
1
0.60 cfs
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Time (hours)
Inflow
Primary

Mills River Townhomes
Type 11 24-hr WQ-BMP #3 Rainfall=2.20"
Prepared by {enter your company name here} Printed 3/10/2023
HydroCAD® 10.00-24 s/n 08975 © 2018 HydroCAD Software Solutions LLC Page 16
Hydrograph for Pond BMP #3: StormTech MC-3500
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
2,074.00
0.00
5.00
0.00
0
2,074.00
0.00
10.00
0.00
0
2,074.00
0.00
15.00
0.13
478
2,074.90
0.28
20.00
0.06
81
2,074.18
0.06
25.00
0.00
18
2,074.04
0.01
30.00
0.00
0
2,074.00
0.00
35.00
0.00
0
2,074.00
0.00
40.00
0.00
0
2,074.00
0.00
45.00
0.00
0
2,074.00
0.00
50.00
0.00
0
2,074.00
0.00
55.00
0.00
0
2,074.00
0.00
60.00
0.00
0
2,074.00
0.00
65.00
0.00
0
2,074.00
0.00
70.00
0.00
0
2,074.00
0.00
75.00
0.00
0
2,074.00
0.00
80.00
0.00
0
2,074.00
0.00
85.00
0.00
0
2,074.00
0.00
90.00
0.00
0
2,074.00
0.00
95.00
0.00
0
2,074.00
0.00
100.00
0.00
0
2,074.00
0.00
105.00
0.00
0
2,074.00
0.00
110.00
0.00
0
2,074.00
0.00
115.00
0.00
0
2,074.00
0.00
120.00
0.00
0
2,074.00
0.00
125.00
0.00
0
2,074.00
0.00
130.00
0.00
0
2,074.00
0.00
135.00
0.00
0
2,074.00
0.00
140.00
0.00
0
2,074.00
0.00
145.00
0.00
0
2,074.00
0.00
150.00
0.00
0
2,074.00
0.00
155.00
0.00
0
2,074.00
0.00
160.00
0.00
0
2,074.00
0.00
165.00
0.00
0
2,074.00
0.00
170.00
0.00
0
2,074.00
0.00
175.00
0.00
0
2,074.00
0.00
180.00
0.00
0
2,074.00
0.00
185.00
0.00
0
2,074.00
0.00
190.00
0.00
0
2,074.00
0.00
195.00
0.00
0
2,074.00
0.00
200.00
0.00
0
2,074.00
0.00

Appendix 3

k7D.scription
Product
TEMPORARY
Typical
Longevity Applications
Slope
Channel
Application
Accelerated
photodegradahle,
polypropylene top
45 days
41 -3:1
1.55 psf / 5.0 fps
net, 100% straw
fiber matrix
0575
Accelerated
photodegradahle,
'
polypropylene
60 days
3:1 -2:1
1.75 psf / 6.0 fps
top B bottom net,
100% straw fiber
GS150
matrix
Photodegradahle,
polypropylene topOk,
12 months
4:1 -3:1
1.55 psf / 5.0 fps
net, 100% straw
fiber matrix
575
Photodegradahle,
polypropylene
top B bottom net,
12 months
3:1 - 2:1
1.75 psf / 6.0 fps
100% straw fiber
matrix
5150
UV -stable
polypropylene
top net, 70%
straw/30
coconut
24 months
2:1-1:1
2.0 psf/8.0 fps
fiber matrix,
photodegradahle
polypropylene
S1150
bottom net
ilk
UV stable
polypropylene top
2.25 psf / 10.0
EW
6 bottom nets,
36 months 11
and Greater
fps
100% coconut
fiber matrix
1125
BIONET
Leno woven
biodegradable
jute top net,
12 months
4:1-3:1
1.6 psf/5.0 fps
-
100% straw fiber
S75BN
matrix
Woven
biodegradable
jute top and
12 months
3:1 - 2:1
1.85 psf / 6.0 fps
bottom net, 100%
straw fiber matrix
S150BN
Woven
hiodegradahle
jute top and
bottom net,
18months
2:1-1:1
2.10psf /8.Ofps
i
70 % straw/30%
coconut fiber
matrix
S1150BN
go
Prod uct
TEMPORARY
Typical Slope
Longevity Applications
Channel
Application
Description
Woven
biodegradable
jute top and
2.35psf /10.0
bottom net, 100%
36 mo. 1:1 and Greater
fps
coconut fiber
L125BN
matrix
700 g woven
biodegradable
coirtop net, 100
Z35 psf /10.0
coconut fiber
36 mo. 11 and Greater
fps
matrix, woven
biodegrdable jute
C700BN
bottom net
PERMANENT
ERONET
UV -stable
Unvegetated
00
polypropylene
3.0 psf/9.0 fps
(PP)top and
Permanent 1:1
bottom net, 100%
Vegetated
PP fiber matrix
10 psf / 16.0 fps
P300
VMAX
UV -stable PP top
5 bottom nets,
Unvegetated
0UV-stable
PP
2.3 psf/8.5 fps
crimped center
permanent 11 and Greater
net, 100 % straw
Vegetated
fiber matrix
8 psf / 18
5200
UV -stable PP
top 5 bottom
nets, UV -stable
Unvegetated
PP crimped
3.0 psf/9.5 fps
center net, 70 %
Permanent 11 and Greater
straw/30%
Vegetated
coconut fiber
10 psf /15.0 fps
S1250
matrix
UV -stable PP
top 5 bottom
Unvegetated
10
nets, UV -stable
3.2 psf/10.5 fps
PP crimped
Permanent 11 and Greater
center net, 100%
Vegetated
mconutfiber
12 psf / 20 fps
1350
matrix
UV -stable PP top
Unvegetated
G bottom nets,
4.0 psf/12.5 fps
UV -stable PP
permanent 1:1 and Greater
crimped center
Vegetated
net, 100% PP fiber
matrix
14 psf / 25 fps)
P550
Vegetated
100% UV -stable
TMax: 15 psf /
monofilament
permanent 11 and Greater
25fps
ya ns, innt
yarns, woven into
a 3-13 structure
TMax-3k: 12 psf /
TMAX/
20 fps
TMAX3k

s
Mills River Townhomes Single Family Attached Development
SKIMMER SEDIMENT BASIN SIZING CHART
Basin
Drainage Area / Flow Calcs.:
Min. Size Calcs.:
Basin Storage Dimensions:
Spillway Calcs.:
#
Draina a area ac.
Weighted
C:
2yr
intensity:
10yr
intensity:
Q2
cfs :
Q10
cfs :
Min. Surface
Area ftZ
Min. Volume
ft3
Bottom
Elevation:
Width ft :
Length ft.:
Area
(ft):
Depth
ft.:
Volume
(ft):
Dewatering
Time hrs.:
Number of
Skimmers:
Skimmer
Size:
Skimmer
Orifice Size:
Ponding
Elevation:
Emergency
Spillway El.:
Emergency
S illwa Dim.:
Emergency
S illwa V f/s :
Water
De th ft :
Free -board
(ft):
Top of
Dam El.:
Total:
Disturbed:
Top:
Bottom:
Top:
Bottom:
1
2.30
2.10
0.39
5.27
7.10
4.69
6.32
2,053.7
3,780.0
2088.0'
32.0
22.0
65.0
55.0
2,080.0
2.5
4,112.5
48 hours
1
2.5in
2.Oin
2090.5'
2091.0'
4.0' X 2.0'
1.58
0.70
1.30
2093.0'
2
4.16
3.23
0.37
5.27
7.10
8.03
10.82
3,517.8
5,814.0
2076.0'
38.0
30.0
94.0
86.0
3,572.0
2.0
6,152.0
48 hours
1
2.5in
2.Oin
2078.0'
2078.5'
6.0' X 2.0'
1.80
0.77
1.23
2080.5'
3
1.48
1.48
0.40
5.27
7.10
3.12
4.20
1,366.0
2,664.0
2078.0'
26.0
14.0
54.0
42.0
1,404.0
3.0
2,988.0
48 hours
1
1.5 in
1.4in
2081.0'
2081.5'
3.0' X 2.0'
1.40
0.65
1.85
2084.0'
4
3.40
3.40
0.40
5.27
7.10
7.17
9.66
3,138.2
6,120.0
2074.0'
28.0
20.0
140.0
132.0
3,920.0
2.0
6,560.0
48 hours
1
2.0 in
1.8in
2076.0'
2076.5'
5.0' X 2.0'
1.93
0.80
1.70
2079.0'
1.70
1.70
0.40
5.27
7.10
3.58
4.83
1,569.1
3,060.0
2074.0'
20.0
12.0
100.0
92.0
2,000.0
2.0
3,104.0
48 hours
1
1.5 in
1.4in
2076.0'
2076.5'
3.0' X 2.0'
1.61
0.71
1.79
2079.0'
FE7
1.90
1.90
0.40
5.27
7.10
4.01
5.40
1,753.7
3,420.0
2074.0'
21.0
13.0
105.0
97.0
2,205.0
2.0
3,466.0
48 hours
1
1.5 in
1.6in
2076.0'
2076.30'X2.0'1.800.77
1.73
2079.0'
1.90
1.90
0.40
5.27
7.10
4.01
5.40
1,753.7
3,420.0
2074.0'
21.0
13.0
105.0
97.0
2,205.0
2.0
3,466.0
48 hours
1
1.5 in
1.6in
2076.0'
2076.5'
3.0' X 2.0'
1.80
0.77
1.73
2079.0'
Skimmer Sediment Basin Design Notes:
1. Sediment Basins have been designed in accordance with the North Carolina Erosion
and Sediment Control Planning and Design Manual Standard (Revision number
6/06) Standard number 6.64
2. Maximum Drainage Area = 10 Acres
3. Minimum Volume = 1800 ft3 per Acre of Disturbed Area.
4. Minimum Surface Area = 325 ftZ per Q,0 (cfs) of peak inflow.
5. Dewatering time is from 24 to 72 hours
6. Each basin requires 3 baffles
B 0OKS
E N G 1 N E E R 1 N G A S S. C 1 AT E S
17 Arlington Street / Asheville, NC 28801 / 828-232-4700
General Notes:
Date: 07-18-2022
Calculations By: LBC
Checked By: EJH

POND RIPRAP OUTLET
BMP#2
E-NO
Eddlill
3
F
m
Q
Iz
a
i
0
uz
o.5
3 5 10 20 50 100 200 500 1000
Discharge (0/sec)
Curves may not be extrapolated.
Figure 8.06a [Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (T„, < 0.5 diameter).
Rev. 1 Z93 8.06.3