HomeMy WebLinkAbout1. HPR DAM components and as built.rev 9.30.25 STAMPED (2)_Redacted Harvey's Place Reservoir Diffused Air Mixing
System
As-built Drawings and Design
x
Prepared for:
CLARITY AQUATIC
Q:.".:l',_,".' S ',r�, F>
P RESOURCE
Prepared by:
wt 9W,S� *" 4 MANAGEMENT
August 2025
Table of Contents
1. Introduction...................................................................................................................................................3
2. Harvey's Place Reservoir Diffused Air Mixing System Design:......................................................................3
3. Description of the Diffuser Air Mixing System ..............................................................................................5
3.1. Piping Specification and Pressure Ratings......................................................................................... 12
4. Supplier Contact......................................................................................................................................... 13
5. Drawings..................................................................................................................................................... 14
ii
Harvey's Place Reservoir Diffused Air Mixing System Component
Summary
1. Introduction
Clarity Resources Group (CRG) installed a direct gas sparging diffused air mixing (DAM) system in
Harvey's Place Reservoir (HPR) during July 21 — 24, 2025 for the South Tahoe Public Utility District
STPUD). The HPR DAM system is designed to completely mix the entire water column:
1. Increase and maintain oxygen levels throughout the water column, down to the bottom
waters by promoting and maintaining completely mixed (destratified)conditions and
2. Disrupt thermal stratification.
2. Harvey's Place Reservoir Diffused Air Mixing System Design:
The as-built air flow capacities and pipe lengths for the HPR DAM system are shown in Table 1.
Piping specifications are shown in Table 2. CRG obtained bathymetry and developed the DAM layout
using 1320 feet of diffuser placed in the deepest part of the lake. The diffuser layout is shown in Figure
1.
Table 1:System Parameters
Maximum Flow(SCFM) 56
Average Flow(SCFM) 18
Total Underwater Supply Pipe Length (ft) 1,775 ft
Total In-Lake Diffuser Length (ft) 1,125 ft
Total Porous Hose Length (ft) 2,250 ft
Minimum Submerged Diffuser Depth(ft) 2
Maximum Submerged Diffuser Depth(ft) 53
Piping sizes are shown in Table 2.
Table 2:Piping Specifications
Air Supply Pipe 2-inch PE4710 HDPE SDR 11, black
Buoyancy Pipe 3-inch PE4710 HDPE SDR 17, black
Geochemical Augmentation Pipe 1-inch PE4710 HDPE SDR 11, black
Sleeve Pipe 6-inch PE4710 HDPE SDR 17, black
- 3 -
3. Description of the Diffuser Air Mixing System
Clarity Resources Group constructed the diffused air mixing system (DAM)of HDPE piping,
porous hose, concrete anchors, and stainless-steel connecting components. The porous hose is
manufactured from linear low-density polyethylene and was supplied by Eaton Brothers. A heat-fusion
procedure was used to connect all HDPE components.
This type of DAM system provides a uniform bubble pattern along each porous hose section,
which optimizes the distribution of compressed air(mixing) along the lake, over the deepest section.
The overall detail is presented in Figure 2. As an additional water quality management strategy, a
phosphorus inactivation line was installed. The phosphorus inactivation line has 5/32" holes drilled
every 30 ft and are positioned in the middle of each porous hose section for the first (700 ft)section.
Diffuser components are shown in Figure 3 and listed in Table 3.
t
PH.—W
P" TBB
asRd€a Sup�p�r P+P� .. Cdnn�tuots
I
4'
krd8s8
Ca to
Lake
Arkc4t0ti. Bottom
Figure 2:Diffuser Hypolimnetic Oxygenation System schematic, showing the basic components.
- 5 -
5 32 ' Hole
`° " Black SDR 11
y � OD. = .3 "
I.D. I M
" Black SDR 17
., I.D. = 3.E "
r " Black SDR 11
VIA
O.D. = .375"
I.C . = 1, "rt
�,. IV
b
k
ILL
---------------------------------------=L111
\11 EM")
Figure 3: Detail of diffused air mixing components(Exploded View)
Table 3:Component Description
Mark Description
Number
250 Service Saddle,2"x 1/2" IPS Socket,cut and tapped for 3/4" FNPT, Black, PE4710
601 Branch Tee,3/4" MNPT X 1/2" INSERT X 1/2" INSERT, nylong
602 Hose Barb Tee, 1/2" Ins x Ins, nylon
610 Hose, 1/2",300 psi, Cover: Red EPDM,Tube: Black EPDM,cord reinforced
612 Porous Hose, 1/2", Eaton Brothers
615 Single Ear Clamps,SS, band width 7 mm,thickness 0.6 mm, size range 21.3 to 24.1 mm,
Oetiker 241R, 304SS
616 Single Ear Clamps,SS, band width 7 mm,thickness 0.6 mm, size range 17.0 to 19.8 mm,
Oetiker 198R, 304SS
620 Strainer screen
621 Stainless-steel orifice flow control disc
- 6 -
The DAM system design has two porous hose lines along the entire length of the diffuser
section, with each section divided into independent 15-foot-long porous hose sections. A flow control
orifice in the branch saddle connection to the HDPE supply pipe controls the oxygen flow to each porous
hose section. Additionally,stainless steel filter washers are installed to protect the flow control orifices
from clogging with debris. The air supply piping is 2-inch-diameter black HDPE PE4710. The buoyancy
piping in the water is 3-inch-diameter black HDPE PE4710. All gas piping saddle connections are heat-
fusion welded to the air supply pipe. Concrete anchors are fastened to the diffuser every 15 feet with
stainless steel cables that connect the stainless-steel U-bolt in the concrete anchor to an anchor saddle
that is also heat-fusion welded onto the oxygen supply piping.
Each flow control orifice was designed using"Pipe Flow Expert" modeling software. The design
used the recent topographical map provided by Lake Tech and allowed evaluation of orifice size to
create a uniform air flow through each orifice considering depth of water and corresponding back
pressure over each respective section. As summary of model setup and results are presented in Figure
4. There are 74 branch saddles (orifice flow control connections), each designed to provide a fixed 0.743
SCFM air flow rate to 15-ft of diffuser for a total maximum design 56 SCFM air flow rate. Based on the
topography,there were 11 different sections that resulted in two orifice sizes:#68 and 67. The design
resulted in slightly larger and smaller orifices for deeper and shallower sections, respectively. Based on
the modelling results, a uniform bubble pattern should be achieved for oxygen flow rates ranging from
18 to 56 SCFM. Below 18 SCFM, bubbles will not be observed uniformly along the length of the diffuser.
A summary of drill sizes,corresponding orifice size and saddle location assigned are presented in
Table 4. Table 5 provides a summary of modelled gas flow at20 and 58 psi applied pressure. These
applied gas pressures resulted in a total flow of 18 and 56 SCFM respectively. Table 5 provides a
summary of flow variance across each orifice design for each applied gas flow rate, also summarized
graphically in Figure 5. Table 6 provides details of each branch saddle and corresponding modelled and
actual orifice size.
- 7 -
� m
a
a
`. .; ti
n �
� x
M'j
�f
.... ..,
° ° vw ,
62 7 ( 1 Bea )
fx
Figure 4:Schematic of flow control orifice design showing each section relative to position on
the bottom, with text identifying orifice position, depth, back pressure, and corresponding
orifice diameter to achieve 0.743 SUM per orifice for a maximum 55 SUM total airflow rate.
(See Appendix B for larger image)
- 8 -
Table 4:Summary of drill sizes and corresponding Orifice sizes far branch saddle positions.
Drill Orifice
Saddle Position
Size Size (MM
67 0.8128 1.13,52-61
68 0.7874 1 14-51,62-74
Table 5:Summary table of modelled flow through each orifice size at 20 and 58 psi and total
flow through each group of orifice sizes accordingly.
SCFM Per Orifice SCFMTotal Orifice
Elevation Pressure Orifice
Applied Pressure (psi) Applied Pressure (psi)
(ft SL) (psi) (ruin) 58 Zfi 58
5510 35.0 0.8128 0.204 0.738 1.84 6.6
5512 34.1 0.8128 0.225 0.754 0.90 3.0
5514a 33.2 0.7874 0.232 0.723 0.93 2.9
5514b 33.2 0.8128 0.247 0.770 2.47 7.7
5516 32.4 0.7874 0.250 0.736 5.01 14.7
5518 31.5 0.7874 0.266 0.746 7.18 20.1
O.00047 0.00014 18.3 55.0
Variance (SCFM) Total Flog(SCFM)
Orifice Flow Pate for Maxirnurn and Minimurn Pool Elevations
0.90
0.80
.........
0.70 55 SCFM
a 0.60
0.50
0.40
0.20 18UM
Q 0.10 Total Flow Rate
000
0 200 400 600 800 1000 1200
Distancc Aln n8 Diffu ser(ft)
Full Pool Flow(55 SCFM) Minimum Pool Flow(18 SCFM)
Figure 5:Summary image showing graphically airflow per orifice in SCFM along the diffuser at
18 and 55 SCFM applied gas flow rates..
- 9 -
r# '" . 1.•• r -r.: to r -f r r, off ` r r • I • ar "" s..:r r :r r � ""
r r of- -r r I r # !
ModeledElevation Maximum FORM
■* w, Depth Pressure Orifice
w
� ', � * a, r
�' � +' s 1 E
*� • r �* *.
� * a; ii � i
�� � � m
• : a � * �
f' * r
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,. N •1I• � ," .
�i IL ` ', a
w � •a
a � * a .*
�r � 1 a •� �� 1 w
f • a r 1 s
a �'r ' w
,� � � •� «`
°-' r�,
3.1. Piping Specification and Pressure Ratings
Typical pressure rating of HDPE pipe is rated for water. However, for gas (oxygen or compressed
air)the HDPE piping is de-rated using environmental factors provided by HDPE manufacturers. For
example,SDR 11 is rated at 160 psi for water but is de-rated to 88 psi with environmental and
temperature factors(oxygen, 907)following the procedure presented in Performance Pipe Technical
Note PP 831- TN PE4710 Pipe in Compressed Air or Compressed Gas Service Chevron Phillips Chemical
Company 2014. Table 7 presents a pipe size schedule and ratings for the diffuser piping installed in Elk
Lake. The maximum allowable working pressure is 96 psi for the air supply pipe and 60 psi for the
buoyancy pipe. The buoyancy pipe rating is less than the maximum 125 psi available from the air
compressors,so care should be taken when using the compressed air supply to raise the diffuser.
Table 7: HDPE Pipe Pressure Rating for Oxygen/Compressed Air
Operating Compressed Air
Compressed Air Pipe Temperature Pressure Rating
(OF) (psi)
Trench 2" SDR 11 80 96
Supply 2" SDR 11 80 96
'Diffuser 2" SDR 11 80 96
Operating Compressed Air
Buoyancy Pipe Temperature Pressure Rating
('F) (psi)
Trench 2" SDR 11 80 96
Supply 3" SDR 17 80. 60
Diffuser 3" SDR 17 80 60
- 12 -
4. Supplier Contact
Diffuser Installation:
CLARITY
Clarity Resources Group
1405 Winslow Lane, Madison, WI 53711
pgantzer@clarityrg.com
www.clarltyrg.com
AQUATIC
RESOUkC--E
MANAGEMENT
Aquatic Resources Management
5763 Hwy 16 S,Sebastopol, CA 95472
anthony@aquaticrm.com
www.aguaticrm.com
- 13 -
5. Drawings
- 14 -
Supply -250'
Supply Overview
d Scale ' = 1'
19
27-6" 15' --� 27_5. r-T
77
8° .1. 15" is 1 f- 96 h.- 19 � �� 4°-5"
Ddfuser -1,259
le
Diffuser Overview 5J32 I'Black
taf3 + 1"Black SDR 11 +
1-16
D6 Scale " = 1' o o 18 x 5
i o =hale° to Bolt W]w!rats
+ 3'Black SDR 17 18-8 SS
A e , oncrete
05 05 + 2"Black SDR 11 + �lllert
5d32"Role o_a._ say.
___ _'=-_- Ghern o. =1.920'
Li
= «Buoyancy �, ,� Salton
.1 flower
SuPPIY n,a Pot
7,8„
70
Cis
Diffuser Detail A Diffuser Saddle B Anchor Saddle Anchor Detail
Ct5 Scale Y _ 1' c5 Scale 1®' _ " d5 Scale 1"' _ " d5 Scale 1" _ 1'
y�
Clarity Resources Group [diffused Air Mixing Overview
i�o5 Winslow Lameustcrrr: STPUDrcaject:HPR Line Q "
Madison, WI 53711
h� blot Scale: Drain ; : RevisionBate:
Ph (ear) 999-1878 varies CRC-D!i 3 812512425
2" S D 11
02�F F+ Diffuser
ill Branch
4 Saddle
Drill " hole after Pre-Tapped
welding branch saddle W/3" FN PT
B
ectibul
Scale 3" 1
2" SCR 1
/ F!
+ Anchor
Branch
Saddle
Pre-drilled " hole
Section
Clarity Resources Group Branch Saddle Detail
1405 Winslow Lane Customer: STPUD Project: HPR Lir*Dithisef
Madison, WIfI 53711 Mat Scale: I�rau�ing Revision a Dot
Ph (20 ) 999-1878 31.
= ' ' CRG- 7 0 511812023
d 17
-gallon
flower pot
-1
Belt w routs 18-8 SS
Concrete
2 - 2111 Filled
d
Clarity Resources Group Bucket Weight
1405 Winslow Lane as k4mer: STPU Project: HPR Lim Dy
Madison,WI 53711 Mat dale Drawling Revision a Dote
Ph (206) 999-1878 311 = 1 CRG-D8 512312023
L. 5,520
MINIMUM POOL
-------------------
Line Diffuser Begin
Clarity Resources Group
1405 Winslow Lane Customer: STPUD F'rej ek:HPR Li D"
Madison, W1 53711
Plat Scale: brewing m Revision �3(11012025
te:
Ph (206) 999-1 78 111 = 10' CRG-DI 1 r
L. 5,520
MINIMUM POOL
m
D17
D 18
Line Diffuser End
Clarity Resources Group �
1405 Winslow Lance Customer: STPUD Project:HPR Line D' „ry
Madison, W1 53711
Plat Scale: brewing m Revision �3'11
te:
Ph (206) 999-1878 111 = 10' CRG-D1 '1 012025 h
D5
1R F' 1 1
81 1 1 1 51
L Section
J7 Scale 1" = 7 '
I �1
1 1 51 I! 01 �I 41- 1.P
�q Section
�17 Scale 1" = 7 '
Clarity Resources ro Lire Diffuser Detail
1405 Winslow Lane Customer: STPUU Prejeet:HPR Line DffhjW
w`
Madison, W1 53711 PlatScale: brewing m Revision bete:
Ph (206) 999-1878 111 751 c G- 17 1 3/1 012025
rye 7'
Section
18 Scale 1" = 50'
Clarity Resourcesro Snorkel Detail
1405 Winslow Lane Customer: STPUU Prejeet:HPR Line Dffktw
Madison, W1 53711
PlatScale: brewing m Revision bete:
Ph (206) 999-1878 law =50' G 1 1 3 1012025
? ?00
u ,
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e pipe 0
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ty
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Tl , 1M200 N99, 136.2flV M7, 136.2fV
F g p= 35.000t�ps g p= 35.000&s g p= 35.0001fps g
57.7500 psi.g .00of t p= 35.00D�ps g p= 35.00OC�p! g p= 35.00OLps g p= 35.00OC�ps g p= 35.000O�ps g p= 35.000�ps
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V_ 4:� 4z, V_ v
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4- 4-
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p= 34A666s�g p= 34.10Wps g p= 34.100C�ps g p= 34.100(�ps g
Co Cli Ul) 00
Co 00
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N97, 136.2ift NOO, 136cc)2 ft N93, 130602 ''ft N96, 136,2 ft
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- Fir 0 0 0
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P52, 3,Oft w
N56, 136.200ftlfj N57, 136.200ft
N 114, 1 36.2Pt N 100, 136.2TIt 103, 136.2f`t 106,, 136.M
p= 33,2006�'p p= 33.2oo6'p g p= 312006?p g p= 33.2Oo6'p 9
a� CL Q� O_
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N93, 136.2 ft N98, 136 2 ft N 101, lJ& Oft N104, 10 Oft
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P41, 10f it P92, 22.Of t P95, 22.Of t 98, 22.Oft
N55, 136.200ft N100, IM200ft N99, 136.200ft N 102, 13&200f t N 105, 136. Of&
P43, 3.Oft
N50, 136.200ft?%"*
N51, 136.200ft
P,
Cm C\j C%j
N 153, 136.zt N109, 136.Zt N11Z IM211 _N115, 1MW
p= 32.400�i
)ps g p= 32.400tps g p= 32.4009ops g p= 32.400QSps g
0 C>
a. 0- 0- a�
N 151, 136 Oft N 107, 136. Oft N110, 1336. Oft N1131 136 Of t
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P44, P101, 22�Oft P107, 2ZOft I
3 Oft P104 22.Oft
.............
N49, 136.200f t N152, 136,200ft N 108, 136.200f t N 111, 136.200f t N114, 136.
P32, 10ft
N47, 1M200f t N48, 136.200f t
41.
''P p p
C14 9t CIq
N83� 136.2tV N89, 136.2fa� N116, 13&9t 'N122, 136.2ft 'N119, 136.;6t 'N128, 136.2!bt N 129, 136.21t N 134, 13& N 125, 13&2jt 'N 140, IM2Lt
p= 31.500(?ps g p= 31.500tps g p= 31.50OG-ps g p= 31.50OQipt, g p= 31.5OMps g p= 31.500%ps g p= 31.500?ps g p= 31.500tps g p= 31.500%ps g p= 31�500Gps g
Co
a� Q_ CL a- a_ CL a.
Oft N130, 136. Oft N 132, 136. Oft N 135, 136, Oft N138, 136, Oft
N 115 36 Oft Nll Oft N 120, M Of t N123, 136. Oft N 12F N142, 136 Oft
4-
1 7, IL�X 1 4- X 5, 136.
�- X W. X .0- 6L 4-
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P34, 3 Of t P110� 22.01t P113� 22.Oft P116, 2ZOft P119, 2Z�oft P 122, 22.'Orf t P125, ZZ.UTt I P128, 22.Oft P131, 22.Oft P1341 22.Oft
N46, 1M200ft N 118, 136.200f t N 118, 136,200f t N121, 136.200ft N124, 136.200ft N127, 136.200ft N 131, 136.200f t N133, 136.200ft N 136, 136.200f t N139, IM200ft N 143, 136. Oft
P36, 3.Oft
N38, 1M200ftyl N39, 13&200ft
4- 4- 4- 4-
F 5 P, p P - - -- -1'-- 4-
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'14164, 1M2Y N165� 136.2N 'NI'71, 13&2f)t
N 144, 136.2bt 'N 152, 1 C14 137, 136.Z"t
Cli Cli Cli Cm
N141 1M2f)t N 147, 1 21t 2&
36. 3 6.2M N 153, 13& N 158, 1 36.2tt
P= �l g p= 31.5001�ps g p= 31.500%ps g p= 31.50OWps g p= 31.5004s g p= 31.50D�ps g p= 31,5001�ps g p= 31,500tps g p= 31.5001�ps g p= 31.500Gps g
a, a. a_ CL CL CL a- a- a� CL
N145, 13,6,ioft N 148, 13Z� Oft N150, lll� Oft N154, 131665. Oft N 156, 1 16. 'Oft N159, 116. Oft N 162, 136. Oft N 166, 1 W, Oft N169, IX, Oft N 172, 1 a& Of t "68 Orifice
�+_ 1� 6L 1� 1� X
CP C� C� 18� IL ll� ll� ll� ll� OR ll� 22 - 4 6
O� �Lo a� �uj a� �to O� �Lo O� �Ln CD �Lo cn� �kn <D� �ko O� �Lo O� �to
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P35, P140, 22.Oft P143, 22.Oft P146, 22.Oi Z . P152 22.0ft P155, 22.oft P158, 22,Gfff�t P161, 22,Oft 34 22 Of t
t
3 Oft P149 2 Oft
................ .......... M
..........."I
N37, 1M200ft N 146, 136,200f t N149, 136,200ft N151, 136,200ft N155, 136.200ft N 157, 136.200f t N160, 136.200ft N163, 136.200ft N 167, 136.200f t N170, 13&20Oft N173, 136.. Of�
P28, 3.Of t �o
N35, 136.200ft,'' N36, 136.200ft
p "PI 411 4. 'p,
4- -- ------ 4-
C\j Cli Cli CV
P
N193, 1M2f)t N 188, 136.2f)t "'N191, 136.2f)t -14183, 136.2tt , "N182, 13&2& -N177, 13&Zt 'N194, 13&Zt
p= 31�500%ps g p= 31.500%-ps g p= 31.500Gps g p= 31.50OWps g p= 31.5000s g p= 31.5009-ps, g p= 31�500t;ps g
a. CL Q� a. a.
N 190, 1#. Oft N 187, ft N185, 10 ft N181, 10 t N179, 10 ft N176, 10. 'Oft N174, 1#� 'Oft
CR 11:q -io Cq io Cq -iof Cq -io O� O�
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0 0 PIr 0 rr 0 0
vi T 0 06 ,6
Pro W T 0 to
00 (o
P29, 30ft P180, 22,Oft P179, 2210ft P176, 22.Oft P 169, 22.Out t P 170, 22.Of t P177, 22.Oft
N34, 136.200ft N189, 13&2OOft N186, 136.200ft N184, 13&20Oft N180, 136.200ft N 178, 136.200f t N 175, 136.200f t N 168, 136. Oft
P27, 10ft
N32, 1M200f t N33, 136.200ft p ly
350 ft su &
",Pl 4
C%j
p
W3, 136.2fq4 N201, 136.2f)t N195, 136.Zt
:�p= 33.200&pn g p= 33.200%,p g p= 33.200G-.p
to g
a� a_
N611 136.2 ft N203, lo� Oft N 197, Oft
v Co Co
CR- -I,-
T o 0
rc� T 'o
CL 49 5 1 (#68 Orifice
P13, 10ft P193, 22,Oft P188, 22.. ft
N31, 136.200ft N62, 136.200ft N202, 136.200ft N196, 136. Oft
P242, 3.Oft
-----------------
N254, 136.200ft, N255, 136�200ft
'P, p
C14
p ._,-__ 4:� P,
N C%j 21>t 6 C, 1 C, CN
'�N227, 136. 13 . N8, 136.2ftcj _'N 13, -N 14, 136.2%
N245, 136.;9t N238, 136.2tt -N2213 136.2V N226, 136.2tt zt 36.zt 136.2%
p= 33.2005�ps g p= 33.2001�ps g p= 33.20OGrps g p= 33.200Q p g p= 33,200t-ps g p= 33.2oo6'p p= 33.200%-ps g p= 33.20OQrps g
cf s g p= 33.200(�ps g p= 33.200 &n g
_u til C.0 U)
Cli Cli CA
CL 0- CL CL a. a- a.
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N253, 136.200ft N246, 136.200ft N239, 13&2OOft N220, 13&2OOft N225, 136.2OGft N232, 136.200f t N216, 13&200ft N 192, 136.200f t N7, 136.2001ft N12, 136.200ft N15, 13&2 Ntro
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"N214, 136.2fA _N230, 136.2tt Zt
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p 32.4009tps g p= 32.4O0ltpsfg p= 32.400QJ)s g p= 32.400GLps g p= 32.40OCgps g p= 32.4OOZ-,ps g p= 32.400(bps g p= 32.4001�ps g p= 32A00%ps g p= 32.4009�ps g
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p 32.4001�ps g p= 32.40D�ps g p= 314000Vs g
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