HomeMy WebLinkAboutAmbler_Heat_Recovery_Feasibility_Report_12.31.2005Ambler Heat Recovery Analysis
1.0 INTRODUCTION
December 31, 2005
Alaska Energy and Engineering
Alaska Energy and Engineering, Inc. was retained by Rural Energy Programs/AEA to
review the feasibility of providing available recovered heat from the existing AVEC
power plant to the proposed new city water plant and washeteria in Ambler, and
provide a budgetary project cost estimate based on Force Account Construction,
including Design Engineering and Construction Oversight.
There is an existing heat recovery system in Ambler that used to provide recovered
heat to the existing water plant and the school Teachers Quarters (old school). It is
reported that the heat recovery system has been out of service for many years, due in
part to failed heat exchangers and possibly failed arctic piping. For purposes of this
report, it has been assumed that the existing heat recovery module at the power plant
will be reused with minor modifications, including refurbishing or replacing the existing
heat exchanger and installing new circulating pumps.
Additional assumptions have been made in the development of this report including
but not limited to the proposed arctic piping route, building heating loads, and flow
rates and pressure drops of the existing power plant cooling system and heat
exchanger. It is anticipated that refinements in arctic pipe size and routing, pump and
heat exchanger sizing, and other design elements will be required if the project
progresses to final design. However, unless significant changes are required, the
project cost is not expected to exceed the estimate contained herein.
Available as-built information was obtained from the Alaska Village Electric
Cooperative (AVEC) regarding the existing generators cooling system and heat loads
of the AVEC power plant. Available heat load and design information were obtained
from Larsen Consulting Group for the proposed water plant and washeteria. No site
visits were made to confirm accuracy of information obtained.
2.0 OVERVIEW
ANTHC is currently developing a new water plant and washeteria in Ambler. The
purpose of this study is to provide an estimate of the heat that can be recovered from
the jacket water of the AVEC power plant diesel engines and used to offset heating oil
consumption at nearby public buildings. Useable recovered heat is quantified in
gallons of heating fuel saved using a heating value of 134,000 BTU per gallon of #1
arctic diesel fuel and an overall boiler efficiency of 73%. This analysis only considers
the potential to provide recovered heat to the new water plant and washeteria.
The straight-line distance from the AVEC plant to the new water plant (adjacent to the
existing water plant) is approximately 570-feet. The new washeteria will be located in a
new addition to the existing City Office and is approximately 550-feet from the AVEC
plant. Based on a Business Plan prepared by CRW Engineering Group, the estimated
water plant and washeteria average annual heating fuel consumption is approximately
9,600-gallons and 3,700-gallons, respectively. It is estimated the existing City Office
uses about 2,000-gallons of heating fuel, annually (fuel records were not provided).
The combined annual fuel use of the washeteria/City Office is estimated at 5,700-
galons/year, of which 2,800-gallons is for space heating and 2,900 gallons is for non-
seasonal loads (showers, washing machines, and dryer make-up air hydronic heat).
A spreadsheet has been developed to estimate the recoverable heat based on
monthly total electric power production, engine heat rates, building heating demand,
heating degree days, and passive losses for plant heat and piping. The spreadsheet
utilizes assumed time-of-day variations for electric power production and heat
demand. Power Cost Equalization data for fiscal year 2005 was used in the
1
Ambler Heat Recovery Analysis December 31, 2005
Alaska Energy and Engineering
spreadsheet. The estimated heat rejection rate for a Detroit Diesel DDEC3 Series 60
was used for loads from OkW to 200kW, and a Cummins KTA 1 9 at 1800 rpm was
used for loads over 200kW. Heating degree-days for Kobuk were utilized for this site.
All arctic piping is assumed to be routed below grade. All hydronic piping between
modules is assumed to be 3" pipe with 2" of fiberglass insulation and installed above
grade. Information provided by AVEC was used to estimate the heating load for the
power plant, which includes two off-line generation modules, one control module, one
wood-frame insulated crew quarters, and one wood-frame uninsulated storage shed.
The uninsulated storage shed consumes excessive heat.
In order to improve available recovered heat, for this study it has been assumed the
existing uninsulated shed will be replaced with an insulated connex brought in as part
of the water ~lant I washeteria project. The insulated connex heat load is estimated to
be about 1/5 the heat load of the existing shed.
3.0 OPTIONS FOR FACILTIES TO RECEIVE RECOVERED HEAT
The spreadsheet uses monthly heating degree-days to distribute annual fuel
consumption by month. The monthly heat load is then broken down by hour of the
day using an estimated daily temperature variation. This results in a "peak" load for
each month, which occurs in the middle of the night. This "peak" represents a daily
maximum of the average load for that month, not the absolute peak load. Since a
heat recovery system cannot necessarily meet the actual design peak heat load of a
facility, the average is a good load to design to. To maximize utilization of available
heat, the demand for heat should exceed the available heat. With arctic pipe to both
facilities the "peak" heat available for delivery to the buildings is about 270 MBH. At
this load a flow rate of approximately 50 GPM is required to limit the temperature drop
in the piping loop to approximately 12F.
Following is a summary of the heat demands, percentage of the total heat demand,
and preliminary recommended flow rates for each facility:
Facility
Water Plant
Wash/City Off.
Total
Building % of Total % of Heat
Demand Demand Available
346 MBH 69% 129%
157 MBH 31% 59%
503 MBH 100% 188%
Flow
Avail.
35GPM
15GPM
50 GPM
Heat
Avail
189 MBH
81 MBH
270 MBH
Based on this it appears there are three combinations of load that would work
effectively to utilize most of the heat available: 1) the water plant only, 2) the
washeteria/city office, and 3) water plant and washeteria/city office. Following is a
summary of estimated heat utilization in equivalent gallons of fuel and the percentage
of heat available for each combination of buildings:
Est'd Annual Est'd Heat %of Annual
Facilit~ Fuel Use Delivered Fuel Use
Water Plant Only 9,600 Gal 7,671 Gal 80%
Washeteria/City Office 5,700 Gal 5,689 Gal* 97%
Both Buildings 15,300 Gal 8,864 Gal 58%
* Does not account for peak DHW loads
2
Ambler Heat Recovery Analysis December 31, 2005
Alaska Energy and Engineering
4.0 HEAT RECOVERY SYSTEM DESCRIPTION AND OPERATION:
The heat recovery system will capture heat generated by the AVEC power plant that is
currently rejected to the atmosphere by the radiators. The recovered heat will be
transferred via below grade arctic piping to the end-users. The objective is to reduce
the consumption of expensive heating fuel by utilizing available recovered heat.
Although heat recovery is a viable method of reducing heating fuel costs, a
recovered heat system is a passive heat source and it is imperative that the end-
user facility heating systems are operational at all times.
Hot engine coolant is piped to a plate and frame heat exchanger located in the heat
recovery module (HRM). Heat is transferred from the engine coolant to the recovered
heat loop without mixing the fluids. The recovered heat fluid is pumped through arctic
pipe to the end-user facilities, and is tied into the end-user heating systems using plate
heat exchangers.
AVEC PLANT TIE-IN:
The existing AVEC cooling system is mostly 3" Victaulic piping and uses a Grundfos
booster pump to circulate the engine coolant to the Heat Recovery Module and
radiators. It is reported the existing radiator fan motors are single speed motors with
on/off control provided by aquastats in the engine coolant return piping.
No modifications to the AVEC cooling system are included, except modifications
required in the Heat Recovery Module to connect the new heat exchanger to the
cooling system using a pumped secondary loop.
HEAT RECOVERY MODULE:
The existing HRM is located adjacent to the Butler Building. It is a 9' x 15' insulated
panel structure set on an 1-beam/treated heavy timber foundation. The HRM will be
equipped with a plate heat exchanger, heat recovery loop circulating pumps, and
arctic piping loop expansion tank. A new electric service entrance with meter is
required to provide power to the ventilation system, circulating pumps, and module
lighting. Stainless steel flex hoses are used at the piping connections to the recovered
heat module to provide flexibility for differential movement between the HRM and
AVEC power plant. It is also assumed that some minor improvements/repairs will be
required to the HRM exterior.
The piping inside the HRM and between the Butler Building and the HRM is Schedule
40 steel pipe. All piping will be insulated with a minimum of 1" insulation and have an
aluminum jacket where exposed to the weather. All valves are lug style butterfly
valves with seals that are compatible with 50/50 glycol/water mixtures at 200F.
Flexibility is provided where required for thermal expansion and differential movement.
Air vents, thermometers, pressure gauges, drain valves and pressure relief valves are
also provided.
3
Ambler Heat Recovery Analysis
ARCTIC PIPING (Recovered Heat Loop}:
December 31 , 2005
Alaska Energy and Engineering
The proposed arctic piping is a pre-insulated buried piping system. The piping will be
routed from the AVEC plant, southeast in the existing rights-of-way to the intersection
of Dahl Avenue and Redstone Avenue, then southwest down Redstone Avenue to the
new water plant. Enroute to the water plant, the arctic piping will branch off and
continue southeast on Redstone Avenue Extension to the washeteria/City Office.
The arctic piping system is a pre-insulated, bonded piping system. The pipes consist
of Schedule 40 steel carrier pipe and HOPE outer jacket bonded to polyurethane foam
insulation. The carrier piping will have all welded joints. The system comes complete
with all fittings, tools and accessories required for assembly. The recovered heat fluid
will be a 50150 Propylene Glycol/Water solution to provide freeze protection to the
piping.
WATER PLANT and WASHETERIA/CITY OFFICE TIE-IN:
Plate heat exchangers will be located in the water plant and washeteria/city office
mechanical rooms, and tied into the boiler return piping to pre-heat the boiler water
prior to entering the boiler. The maximum anticipated delivered recovered heat supply
temperature is about 180F. If there is not sufficient recovered heat to meet the
heating load, the boilers will fire and add heat.
Piping will be type L copper pipe and supported as required. Isolation valves will be
sweat style bronze ball valves or flanged butterfly valves. All piping will be insulated
with a minimum of 1" insulation with an all-service jacket. Flexibility will be provided
where required for thermal expansion and differential movement. Air vents,
thermometers, pressure gauges, drain valves and pressure relief valves will also be
provided.
RIGHTS-OF-WAY ISSUES:
There does not appear to be a conflict with right of ways for the arctic piping between
the power plant and the end-user buildings, as the route is entirely within existing road
rights-of-ways, and on City and AVEC property.
A Heat Sales Agreement and Right-of-Entry Agreement will be required from AVEC
for the City to renovate the recovered heat module and to route the arctic piping on
AVEC property.
5.0 SYSTEM CAPACITY
A heat recovery simulation spreadsheet is used to estimate the potential recoverable
heat based on monthly total electric power production, engine heat rates, building
heating demand, heating degree days, and passive losses for plant heat and piping.
The spreadsheet utilizes assumed time-of-day variations for electric power production
and heat demand. All estimates are averages based on monthly totals and do not
reflect peak heat available or utilized.
4
Ambler Heat Recovery Analysis
5.1 Heat Demand
December 31, 2005
Alaska Energy and Engineering
The heat demand for the water plant and washeteria was estimated based on data
provided in the Ambler Business Plan prepared by CRW Engineering Group. The
combined annual heating fuel consumption for the new water plant and new
washeteria/city office is 15,300 gallons (water plant is 9,600 gallons and
washeteria/city office is 5,700 gallons). Approximately 2,800 gallons is estimated to
be non-seasonal (hot water for showers, washing machines and dryer preheat coils)
and 12,500 gallons is seasonal.
From the spreadsheet, the highest average heat demand is 343 MBH {Water Plant =
236 MBH, washeteria/office= 107 MBH) in February. This is based on heating degree
days (-10F average ambient temperature). For 1% design day {-45F ambient
temperature) the combined maximum heat load is estimated to be 503 MBH (Water
Plant = 346 MBH, washeteria/office = 157 MBH}, not including peak domestic hot
water load.
5.2 Heat Available
The AVEC power plant has two primary units -a Detroit Diesel Series 60 DDEC3
rated 314 kW at 1800 rpm and a Cummins KTA19 rated 397 kW at 1800 rpm. The
Series 60 ran 6585 hours and the KTA19 ran 2197 hour in 2004. It is assumed the
Series 60 runs when loads are below about 200kW, and the KTA19 runs when loads
are greater than 200kW. The Series 60 has an air-cooled aftercooler, and the jacket
water heat rate is approximately 1,360 BTUH per kW electric load. The KTA19 has a
jacketwater aftercooler, which results in a heat rate of about 2,255 BTUH per kW
electric load.
From the spreadsheet, the highest average delivered heat is 268 MBH -based on
average power production. The peak electric load in FY2005 was 302 kW, occurring
in January 2005. Winter daily peak loads are estimated to be approximately 280 kW.
The heat output from the KTA19 at 280 kW is approximately 630 MBH. Fixed losses
for arctic piping and plant piping are estimated at 68 MBH and variable losses for plant
heat and exterior piping are estimated at 142 MBH on a peak design day. Net peak
heat available is approximately 420 MBH. Since the peak heat demand exceeds the
heat available, the heat recovery system should be designed based on heat available.
5.3 Flow Rates
As indicated in Section 2.0, an arctic pipe flow rate of 50 GPM was selected so the
heat recovery loop temperature differential would not exceed about 12F at average
winter heat output. However, since the KTA19 operates much of the cold winter
months, the heat recovery system should be designed to utilize the higher available
heat from the KTA19. For 420 MBH at 50 GPM, the delta-Twill be 19F-which is a
reasonable temperature drop for a boiler heating system. It is expected that the
washeteria heat demand will be greater during "daytime" hours -due to the high
domestic hot water heat load, whereas the water plant heat load will be greatest late
at night.
In order to regulate the heat recovery loop flow rate to each end-user, it is proposed to
utilize a thermostatically operated regulating {throttling) valve in the heat recovery loop
at each end-user heat exchanger. These valves will throttle the recovered heat flow
through the end-user heat exchanger based on the building return temperature. As the
return temperature from the building to the heat exchanger increases, the recovered
heat flow from the power plant will be reduced. In this way, when one end-user heat
load is low, more of the available heat {flow) will go to the other end-user. Additionally,
a variable speed drive will be used to control the heat recovery loop flow rate in order
5
Ambler Heat Recovery Analysis December 31, 2005
Alaska Energy and Engineering
to maximize the heat delivered when the KTA19 is online and to help prevent
overcooling the engine cooling system when the Series 60 is online.
The Series 60 coolant flow is about 80 GPM, and the KTA19 coolant flow is about 145
GPM at rated load. To avoid additional external head on the generator cooling system
pumps, a secondary pumped loop will be used off of the jacket water cooling loop to
the radiators. The secondary pumped flow needs to be less than 80 GPM to avoid
dilution of hot coolant when the Series 60 is on-line so will set the secondary loop flow
equal to arctic pipe flow rate of 50 GPM.
5.0 EQUIPMENT SELECTIONS
5.1 Heat Exchangers
Based on initial selected flow rates, brazed plate heat exchangers will be adequate for
all locations. The total end-user heat exchanger capacity is greater than the power
plant heat exchanger capacity, to benefit from the increased flow resulting from use of
the thermostatically operated regulating valves. Initial heat exchanger selections are
as follows.
HX-1: (Power Plant) Ameridex SL 140TL-LL-80 or equaL 400 MBH capacity.
Primary: 50 GPM 190F EWT (50% ethylene glycol), 1.0 PSI max WPD
Secondary: 50 GPM 180F LWT (50% propylene glycol) 1.0 PSI max WPD
HX-2: (Water Plant) Ameridex SL 140TL-LL-80 or equaL 350 MBH capacity.
Primary: 50 GPM 180F EWT (50% propylene glycol), 1.0 PSI max WPD
Secondary: 50 GPM 175F LWT (50% propylene glycol) 1.0 PSI max WPD
HX-3: (Washeteria/City Office) Ameridex SL 140TL-LL-80 or equal. 200 MBH cap.
Primary: 22 GPM 180F EWT (50% propylene glycol), 1.0 PSI max WPD
Secondary: 20 GPM 175F LWT (50% propylene glycol) 1.0 PSI max WPD
5.2 Arctic Pipe Sizing
The length of heat recovery loop piping between the power plant and water plant is
approximately 1500'. The arctic pipe is sized so the pressure drop is less than 1' head
per 100' to limit pumping energy. Using 3" piping, the unit pressure drop is
approximately 0.67' per 1 00' at 50 GPM.
5.3 Circulating Pumps
P-HR1: HX-1 Primary circuit off engine coolant loop
Flow= 50 GPM, Head = 2' (HX) + 4' (piping) = 6'
Select: Grundfos UPS 40-40, 50 GPM at 6' TDH, 1/3 HP, Speed 3
P-HR2: Heat recovery loop to water plant
Flow= 50 GPM, Head= 2' (HX-1) +2' (HX-2) + 20' (piping)= 24'
Select: Grundfos TP40-80/2, 50 GPM at 24' TDH, 3/4 HP, variable speed
motor
5.4 Expansion Tank
See spreadsheet for expansion calculations. Total heat recovery loop volume is
estimated at 950 gallons. Pressure relief at the power plant heat exchanger will be 50
PSIG, so will size tank to limit operating pressure to 90% of maximum (45 PSIG).
High point of system approximately 16' above base of expansion tank so 7 PSIG
minimum is pressure required at the expansion tank to keep heat loop system
6
Ambler Heat Recovery Analysis December 31, 2005
Alaska Energy and Engineering
pressure positive. Will set tank pre-charge to 10 PSlG to provide 3 PSIG positive
pressure at high point. 12.1 PSIG fill pressure required at 40F to maintain 1 0 PSIG at
OF. Will fill system cold to 12 PSIG to provide minimum 2 PSIG pressure above
expansion tank pre-charge and 8 gallons of glycol in the tank at 40F, so the tank will
not go dry at OF.
ET-1: Minimum requirements 97.5 gallon tank and 67.0 gallon acceptance
Select: Amtrol L300, 1 05 gallon tank and 94.5 gallon acceptance
6.0 CONCLUSIONS AND RECOMMENDATIONS
The project has a relatively high construction cost due to the distance between the
power plant and end-user building(s). However, based on a cost of fuel of $4.15/gallon
(from the Business Plan), the simple payback for all three options are about 10 years,
or less.
Estimated Project Cost And Savings:
Facility Served
Water Plant Only
Washeteria/City Office
Both Buildings
Est'd Fuel
Savings
7,671 Gal
5,689 Gal*
8,864 Gal
7
Value at
$4.15/gal
$31,835
$23,610
$36,786
Est'd Const Simple
Cost Payback
$244,318 7.8 yrs
$243,743 10.3 yrs
$305,248 8.3 yrs
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PROJECT:
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AEA RECOVERED HEAT STUDY
AMBLER RECOVERED HEAT SYSTEM
SITE PLAN & DETAILS
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DRAWN BY: SJS Stat,. of Alasko * Oeportqtent at Commumy and Economic Oevelapment *•-AIDEA/AEA Rural Energy Group -ALASKA ~-813 W.at Northern U9hta Blvd. IE ENERGY AUTHORITY * * ................... 99503
llESIGNED BY: SJS
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Dimensional Data-Table M
Vt
A B
Tank Acceptance
Model Diameter Overall Connection Weight Volume Volume Volume
No. Height
AX-15 12 19
AX-20 12 25
AX-40 12 49
AX-60 16 42'14
AX-60V 16 43
AX-80 16 55
AX-80V 16 56
AX-100 16 68
AX-100V 16 69
AX-120 24 40'/4
AX-120V 24 44V.
AX-144 24 45%
AX-144V 24 49%
AX-180 24 52 112
AX-180V 24 56 112
AX-200 24 63
AX-200V 24 67
AX-240 24 741/4
AX-240V 24 76%
200L 24 383/e
300L 24 52%
400L 24 661/•
SOOL 24 801.4
600L 30 65
BOOL 30 83
1000L 36 73 112
1200L 36 851fe
1400L 36 98'14
1600L 48 711/4
2000L 48 85%
Series
L
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~.A. Armstrong limited
!3 Bertrand Avenue
)carborough, Ontario
~anada, M1 L 2P3
ret (416) 755-2291
:ax: (416) 759-9101
'ORM NO.: 6713-b
Armstrong Pumps limited
Peartree Road, Stanway
Colchester, Essex
United Kingdom, C03 5JX
Tel: 0206-579491
Fax: 0206-760532
Size
'12
'12
'12 --~
'12
'12 ..
1f2
'12
'12
'12
1
1
1
1
1
1
1
1
1
1
1112
11/2
1112
-
1¥2
1112
1112
1112
1112
1112
-1'12
1112
tA-1.
Series l
AX-V B
~-J
(lbs) (liters) (Gallons) (Gallons)
46 2 7.8 2.5
59 41 10.9 2.5
114 82 21.7 5.0
139 127 33.6 11.1
145 127 33.6 11.1
···-
196 168 44.4 22.2
201 168 44.4 22.2
231 211 55.7 22.2
237 211 55.7 22.2
266 257 I 68.0 34.0
285 257 68.0 34.0
233 291 77.0 34.0 = r----·
299 291 Tl.O 34.0
286 341 90.0 34.0
305 341 90.0 34.0
326 416 110.0 34.0
335 416 110.0 34.0
397 498 131.7 44.4
401 498 131.7 44.4
204 200 53 47.7
250 300 79 71.1··
·~·~
295 400 105 94.5
340 500 132 118.8
555 600 158 142.2
680 800 211 189.9
760 1000 246 221.4
864 1200 317 285.3
968 1400 370 333.0
1580 1600 422 379.8
1810 2000 528 475.2'
Series AX
Armstrong Pumps Inc.
93 East Avenue
North Tonawanda, New York
U.S.A. 14120-6594
Tel: (716) 693-8813
Fax: (716) 693-8970
1-800-FLOW-845
Armstrong Darling Inc.
2200 Place Transcanadienne
Dorval, Quebec
Canada, H9P 2X5
Tel: (514) 421-2424
Fax: (514) 421-2436
PAGE 4 OF 4
Printed in Canada
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Glycol TypeQ[1=
System
Volume: 950 gallons
Ambler Exp Tank Sizing.xls
SR-1 50/50; 2 = Dowfrost 50/50]
From Design Cales
Glycol
Expansion: 0.0705 Total Antifreeze Expansion (OF to 200F) from Table BELOW
8 = Fill Pressure at Exp Tank
C =Max Operating Pressure at Exp Tank
D = Exp Tank Precharge Pressure
Accept Factor (A.F.): (D+14.7)/(B+14.7)-(D+14.7)/(C+14.7)
IF Min Press= Precharge+/-; AF = 1-(D+14.7)/(C+14.7)
THEREFORE: to minimize tank volume, Precharge must be low and Max Press High
Accept Voi=Total Expan-;~~ ..... ~ ~ ... ;..,.
Tank Volume = A ...... .,.n+:::a
fl~· =lnit. Fill p,res~~re 1to.e~9~~· t
Initial Fill Volume in Exp Tank is required to keep system pressure positive at OF
% Volume Expansion
Antifreeze OF-40F 40F-200F OF-200F -20Fto40F
50/50 Dowtherm SR-1/H20 0.0064 0.05 0.0564 0.0085
50/50 Dowfrost Prop/H20 0.0085 0.062 0.0705 0.0119
2/26/2006
p,--:--P~
2003 6364 80817 78765 172 3141 2.4247 3/4/2015 295 116
2003 6724 92993 83686 216 . 2498 24247 3/4/2002 295 114
2003 7624 101591 89966 224 2463 2.4247 3/4/2002 295 121
Ambler 4 2003 7855 107032 98364 216 3153 2.4247 3/4/2002 295 120
Ambler 5 2003 7652 106488 102479 224 2732 2.4247 3/4/2002 295 119
Ambler 6 2003 8274 113215 112152 250 3261 2.4247 3/4/2002 295 117
Ambler 7 2003 8094 117772 112736 259 3961 2.4247 3/4/2002 295 118
Ambler 8 2003 7316 105768 93368 233 1712 2.4247 3/4/2002 295 117
Ambler 9 2003 8146 118220 97295 276 2825 2.4247 3/4/2002 295 113
Ambler 10 2003 7122 99903 95314 216 2641 2.4247 3/4/2002 295 116
Ambler 11 2003 7073 96643 92832 207 2800 2.4247 3/4/2003 295 117
Ambler 12 2003 6645 85585 73545 172 3394 2.4247 3/4/2002 295 117
88889 1226227 1130502
Ambler 1 2004 6421 85806 81392 190 3543 2.4247 3/4/2002 295 117
Ambler 2 2004 7121 96549 92433 216 3584 1.8998 8/25/2003 295 117
Ambler 3 2004 7668 103789 108004 250 3350 2.118 9/8/2003 295 121
Ambler 4 2004 8778 123889 95716 276 3422 2.1118 9/8/2003 295 122
Ambler 5 2004 10257 134029 126749 285 2613 2.118 9/8/2003 295 118
Ambler 6 2004 10727 140764 143454 319 1991 2.1118 9/8/2003 295 117
Ambler 7 2004 10924 143610 124778 302 2098 2.118 9/8/2003 295 122
Ambler 8 2004 10531 137586 131001 302 1896 1.4602 8/26/2003 295 121
Ambler 9 2004 10454 137230 121861 285 3279 2.1118 9/8/2003 295 124
Ambler 10 2004 8084 117769 117124 241 2566 2.1118 9/8/2003 295 122
Ambler 11 2004 7831 110972 114399 241 2744 1.8998 8/25/2003 295 122
Ambler 12 2004 6600 89624 82837 190 4373 1.89867 9/20/2003 295 120
105396 1421617 1339748
Ambler 1 2005 6708 90441 91783 207 1720 2.427 6/10/2004 291 120
Ambler 2 2005 7594 105631 90071 224 2710 2.427 8/20/2004 291 120
Ambler 3 2005 7714 109898 101666 259 2341 2.427 8/20/2004 291 118
Ambler 4 2005 8178 117815 115235 259 3201 2.427 8/20/2004 291 119
Ambler 5 2005 8826 128868 123097 285 1151 2.427 8/20/2004 291 121
Ambler 6 2005 9266 136020 131317 276 2307 2.427 8/20/2004 291 118
Ambler 7 2005 9411 136710 132281 302 2302 2.427 8/20/2004 291 118
Ambler 8 2005 8144 120469 114280 285 2139 2.427 8/20/2004 291 125
Ambler 9 2005 8242 118162 114005 267 2190 2.427 8/20/2004 291 123
Ambler 10 2005 8553 112167 107112 250 1897 2.427 8/20/2004 291 118
Ambler 11 2005 7232 96896 86920 233 2301 2.427 8/20/2004 291 121
Ambler 12 2005 5932 76363 74366 163 2541 2.427 8/20/2004 291 119
95800 1349440 1282133