HomeMy WebLinkAboutCT 00-18; RECYCLED WATER STUDY; 2003-01-20DEXTER WILSON ENGINEERING, INC.
WATER • WASTEWATER • ENVIRONMENTAL
CONSULTING ENGINEERS
703 PALOMAR AIRPORT ROAD, SUITE 300 • CARLSBAD, CA 92009 • (760) 438-4422
RECYCLED WATER STUDY
FOR THE
CANTARINI AND HOLLY SPRINGS PROJECT
IN THE
CITY OF CARLSBAD
January 20, 2003
Prepared by:
Dexter Wilson Engineering, Inc.
703 Palomar Airport Road
Suite 300
Carlsbad, CA 92009
Job No. 726-001
DEXTER WILSON ENGINEERING, INC.
DEXTER S. WILSON, P.E.
ANDREW M. OVEN, P.E.
STEPHEN M. NIELSEN, P.E.
MICHAEL J. FILECCIA, P.E.
January 20, 2003 726-001
Ladwig Design Group
703 Palomar Airport Road, Suite 300
Carlsbad, CA 92009
Attention: Bob Ladwig, President
Subject: Recycled Water Study for the Cantarini and Holly Springs Projects in
the City of Carlsbad
Introduction
This report provides a study of potential recycled water use for the Cantarini and Holly
Springs projects. This document provides-information concerning water demands,
existing facilities, and recommended piping within the development projects.
This report was originally prepared on September 24, 2002 and was submitted to the
City of Carlsbad for review. Comments on the report were received from the City of
Carlsbad Engineering Design Division dated November 12, 2002. A copy of this
correspondence is included in Appendix B. Also included in Appendix B are responses
to the comments summarizing how the comments were addressed in the revised
recycled water study for the Cantarini and Holly Springs projects.
703 PALOMAR AIRPORT ROAD, SUITE 300 • CARLSBAD, CA 92009 9 (760) 438-4422 9 FAX (760) 438-0173
Bob Ladwig
January 20, 2003
Project Overview
The Cantarini and Holly Springs projects are located east of El Camino Real along the
east side of the extension of College Boulevard. These two projects are adjacent to each
other with Holly Springs positioned on the north property boundary of the Cantarini
project. Exhibit A at the back of this report presents the layout of these two projects.
Access to the Cantarini project will be from the extension of College Boulevard; the
Holly Springs project can only be accessed through the Cantarini project.
The Cantarini project proposes a total of 105 single family detached residential homes
and 80 multi-family units. The Holly Springs project proposes 39 single family
detached residential homes plus four future single family home lots. Finish grade for
building pads within these two projects range in elevation from a low of 120 feet to the
highest building pad which is 380 feet in elevation.
Design Criteria
The duty factor used to convert irrigated acreage into average day recycled water
demands is 2,232 gpdlacre (2.5 acre-feet/acre/year).
In general, daily and hourly peak factors for irrigation demands are higher than those
for domestic water demands. In evaluating the recycled water facilities in this
document, a factor of 4.3 was used to convert average recycled water demands to peak
hour demands.
The primary criteria for determining the pipe sizing for recycled water lines is the
ability to meet peak hour recycled water demands while maintaining a maximum
pipeline velocity of 8 feet per second. -
DEXTER WILSON ENGINEERING, INC. PAGE 2
Bob Ladwig
January 20, 2003
System Pressure
Landscape systems generally require a minimum of 60 to 80 psi at the meter location
to obtain adequate coverage of the irrigated area. This minimum pressure cannot be
achieved at all locations within the Cantarini project and cannot be achieved at all
within the Holly Springs project. For the purposes of this study, we have assumed that
a delivery pressure of 60 psi may be acceptable and recycled water facilities should be
provided up to these points. Where less pressure is available from the recycled water
system, the irrigation demands shall be met from the potable water system.
Existing Facilities.
The existing recycled water facilities in the vicinity of the Cantarini and Holly Springs
projects include a 12-inch pipeline in the extension of College Boulevard east of El
Camino Real. This 12-inch main ties into the 384 Zone recycled water system that
extends west to the Twin "D" Tanks. These two tanks were converted from potable
water use several years ago and now serve as 384 Zone storage for recycled water. The
Carlsbad Municipal Water District will have a 16-inch recycled water pipeline in
Cannon Road and a 12-inch recylced water pipeline in College Boulevard at Cannon
Road. In addition, the Districts's existing "C" Tank Reservoir is being converted to
recycled water storage.
The City of Carlsbad Master Plan Update, Recycled Water, Volume IV, dated October
1997 does not specifically address recycled water use in the area of the Cantarini and
Holly Springs projects. In addition, the recycled water master plan does not address
the extension of a higher pressure zone recycled water system to the area of the
Cantarini and Holly Springs projects. The pressure zone available, which is the 384
DEXTER WILSON ENGINEERING, INC. PAGE 3
Bob Ladwig
January 20, 2003
Zone, is expected to be the only recycled water source to, this area east of El Camino
Real. However, this pressure zone can be extended into higher service areas by means
of irrigation booster systems. These systems can be connected to the 384 Zone recycled
water piping and deliver irrigation service to areas above the service zone elevation.
Recycled Water System Service Area Limitations
As stated in previous paragraphs, the 384 Zone recycled water system, which is
available to the Cantarini and Holly Springs projects in College Boulevard east of El
Camino Real, has a limited service area within these projects due to topographic
constraints. In order to supply the recommended minimum pressure of 60 psi at the
irrigation meter, the 384 Zone can only serve elevations up to 245 feet. Exhibit A at
the back of this report shows the potential service area for the 384 Zone system. Notice
that none of the Holly Springs project is within the 384 Zone service area, but a
majority of the Cantarini project can be serviced with recycled water. Landscaping in
areas of higher elevation than can be served directly from the 384 Zone system can be
irrigated using an irrigation booster system that would be activated only when the
irrigation system is activated. These types of systems would be evaluated on a case by
case basis during the final design of the landscaping and irrigation systems for the
projects.
Exhibit A provides a representation of the proposed landscaped areas that can be
irrigated with recycled water directly from the 384 Zone recycled piping system. These
areas are primarily HOA maintained slopes and City maintained streetscapes. There
are no other common areas within these two projects that would be potential recycled
water use areas.
DEXTER WILSON ENGINEERING, INC. PAGE 4
Bob Ladwig
January 20, 2003
Projected Recycled Water Use
Table 1 presents the projected average annual recycled water demand for the areas of
the Cantarini project that can be served by the recycled water system. None of the
Holly Springs project can be served with recycled water because of the higher range of
elevations within the Holly Springs project.
Recycled water is proposed to be used for irrigation of street landscaping and slopes
adjacent to the major streets. Potential recycled water use areas have been identified
for the portion of the Cantarim project that can be served by the existing recycled
water system. These areas are identified on Exhibit A in the back pocket of this report.
Once the potential recycled water use areas were determined, a uniform application
rate of 2,232 gpdiacre (2.5 acre-feet/acre/year) was applied. The estimated average
daily recycled water demand for the project is 45,636 gpd (31.7 gpm).
DEXTER WILSON ENGINEERING, INC. PAGE 5
Bob Ladwig
January 20, 2003
TABLE 1
CANTARINI PROJECT RECYCLED WATER DEMAND
. .., .... f
an ariniO
P.
sea erna
Permanent 219,062 5.0 2,232 11,224.7
Landscaping
Naturalizing 2941802 6.8 2,232 15,105.6
Landscaping
Condominium 58,747 1.3 2,232 3,010.2
Project
College Boulevard 318,022 7.3 2,232 16,295.3
Streetscape .
AL
Recommended Recycled Water Facilities
The proposed recycled water facilities recommended to serve the Cantarini project are
shown in Exhibit A. The proposed recycled water lines in Exhibit A are schematic and,
therefore, may need to be extended or shortened to the actual location of the irrigation
meters once those locations are designed. Exhibit A also presents the recommended
recycled water pipe sizes through the Cantarini project. These line sizes-were verified
as adequate using a computer model to ensure that pipeline velocities and head loss
do not exceed design criteria. The computer modeling results are presented in
Appendix A.
The proposed recycled water facilities shown within the Cantarini project also take into
consideration future recycled water uses east of the project. Future development to the
DEXTER WILSON ENGINEERING, INC. PAGE 6
Bob Ladwig
January 20, 2003
east of the Cantarini project (Mandana property) will be able to make use of the 384
Zone recycled water system. For this reason, the recommended recycled water system
layout includes a 12-inch recycled water main extending to the Cantarini project's
eastern property boundary in "A" Street. An estimate of 60 gpm average daily demand
was made for the area east of the Cantarini project that is within the service zone of
the 384 Zone recycled water system. This estimate uses the ratio of total project
acreage to irrigated acreage for the Cantarini project and applies it generally to the
future Mandana property.
In addition, the recommended layout also includes a 12-inch recycled water pipeline
in College Boulevard from the existing 12-inch stub-out at The Terrace project just east
of El Camino Real to the intersection of College Boulevard and Cannon Road. At this
location, the Carlsbad Municipal Water District will have constructed a 16-inch
recycled water line in Cannon Road from El Camino Real. There are future projects
in the vicinity of the intersection of College Boulevard and Cannon Road which will be
able to make use of recycled water for landscape irrigation; in addition, the
streetscapes for these two major roadways will also be able to be irrigated from the 384
Zone recycled water system.
Recommendations
The following recommendations and conclusions are made based on the recycled water
system analyses performed for the Cantarini and Holly Springs projects.
1. The available recycled water for the Cantarini and Holly Springs projects is
from the 12-inch 384 Zone recycled water system pipeline within the existing
portion of College Boulevard just east of El Camino Real at The Terraces project.
DEXTER WILSON ENGINEERING, INC. PAGE 7
Bob Ladwig
January 20, 2003
Because the available hydraulic grade line is only. 384 feet, recycled water
service will not be achievable for all areas of the Cantarini project; no portions
of the Holly Springs project are anticipated to be able to be served by recycled
water. Installation of irrigation booster systems at the upper ends of the 384
Zone service area should be considered on a case by case basis once the design
of the landscaping and irrigation systems is underway. These packaged
irrigation booster systems would function only when the irrigation system is
activated.
Exhibit A presents the recommended water system layout and water line sizes
for both projects.
Exhibit A also presents the proposed areas that are recommended to be irrigated
with recycled water.
The recycled water lines within the Cantarini project must be designed to meet
AWWA C900 Class 150 for PVC pipe.
Use of recycled water in future development areas to the east of the Cantarini
project will be accommodated by extending a 12-inch recycled water line in
Street "A" to the eastern subdivision boundary.
Use of recycled water in future development areas to the north of the Cantarini
project will be accommodated by construction of a 12-inch recycled water line in
College Boulevard from The Terraces project north to the intersection of College
Boulevard and Cannon Road. This pipeline is proposed to be installed as part
of the College Boulevard improvements being constructed by the Cantarini and
Holly Springs projects.
DEXTER WILSON ENGINEERING, INC. PAGE 8
Bob Ladwig
January 20, 2003
Thank you for the opportunity to prepare this report. If you have any questions on the
enclosed information, please do not hesitate to call.
Dexter Wilson Engineering, Inc.
Andrew Oven
(4ØWM1
DEXTER WILSON ENGINEERING, INC. PAGE 9
J '.j roci
RECYCLED WATER SYSTEM ANALYSIS
For Node and Pipe Diagram, see Figure 1, 11 X 17 graphic at the end of
Appendix A
The following conditions were modeled:
Average Day Demands
Peak Hour Demands
A-I
ROUGHNESS MINOR LOSS K FIXED GRADE
120.0 .00 370.00
120 .0 .00
120 .0 .00
120 .0 .00
120 .0 .00
120 .0 .00
120.0 .00
120.0 .00
120 .0 .00
120.0 .00
120.0 .00
120.0 .00
120 0 .00
120.0 .00
120 .0 .00
120 .0 .00
120.0 .00
120.0 .00
120.0 .00
CONNECTING PIPES
100 103 116
103 106
106 109 112
109
112 115
115
116 118
118 121 133
121 124 127
124
127 128 130
128
130
133 136
136 139 142
139
142 145
145 148
148
Cantarini and Holly Springs Projects in the City of Carlsbad
Recycled Water Analysis
January 20, 2003
FLOWRATE IS EXPRESSED IN GPM AND PRESSURE IN PSIG
A SUMMARY OF THE ORIGINAL DATA FOLLOWS
PIPE NO. NODE NOS. LENGTH DIAMETER
(FEET) (INCHES)
100 0 1 1500.0 12.0
103 1 4 1000.0 12.0
106 4 7 800.0 12.0
109 7 10 300.0 12.0
112 7 13 400.0 6.0
115 13 16 500.0 6.0
116 1 17 600.0 12.0
118 17 19 700.0 12.0
121 19 22 750.0 12.0
124 22 25 900.0 6.0
127 22 28 700.0 12.0
128- 28 29 200.0 12.0
130 28 31 350.0 6.0
133 19 34 500.0 6.0
136 34 37 800.0 6.0
139 37 40 700.0 6.0
142 37 43 450.0 6.0
145 43 46 750.0 6.0
148 46 49 600.0 6.0
JUNCTION NUMBER DEMAND ELEVATION
1 3.37 110.00
4 3.68 120.00
7 2.73 130.00
10 .73 133.00
13 2.13 125.00-
16 .97 165.00
17 3.38 122.00
19 1.98 146.00
22 1.71 190.00
25 1.53 240.00
28 2.47 200.00
29 60.00 220.00
31 1.43 241.00
34 .81 180.00
37 .55 175.00
40 .94 160.00
43 2.25 220.00
46 .39 215.00
49 .65 240.00
OUTPUT SELECTION: ALL RESULTS ARE OUTPUT EACH PERIOD
3 VALUES ARE OUTPUT FOR MAXIMUM AND MINIMUM PRESSURES
A-2
Cantarini and Holly Springs Projects in the City of Carlsbad
Recycled Water Analysis
January 20, 2003
THIS SYSTEM HAS 19 PIPES WITH 19 JUNCTIONS , 0 LOOPS AND 1 FGNS
THE RESULTS ARE OBTAINED AFTER 2 TRIALS WITH AN ACCURACY = .00000
Cantarini and Holly Springs Projects in the City of Carlsbad 726001r
Recycled Water Analysis
Average Day Demands
PIPE NO. NODE NOS. FLOWRATE HEAD LOSS PUMP HEAD MINOR LOSS VELOCITY HL/1000
100 0 1 91.70 .05 .00 .00 .26 .04
103 1 4 10.24 .00 .00 .00 .03 .00
106 4 7 6.56 .00 .00 .00 .02 .00
109 7 10 .73 .00 .00 .00 .00 .00
112 7 13 3.10 .00 .00 .00 .04 .00
115 13 16 .97 .00 .00 .00 .01 .00
116 1 17 78.09 .02 .00 .00 .22 .03
118 17 19 74.71 .02 .00 .00 .21 .02
121 19 22 67:14 .01 .00 .00 .19 .02
124 22 25 1.53 .00 .00 .00 .02 .00
127 22 28 63.90 .01 .00 .00 .18 .02
128 28 29 60.00 .00 .00 .00 .17 .02
130 28 31 1.43 .00 .00 .00 .02 .00
133 19 34 5.59 .00 .00 .00 .06 .01
136 34 37 4.78 .00 .00 .00 .05 .00
139 37 40 .94 .00 .00 .00 .01 .00
142 37 43 3.29 .00 .00 .00 .04 .00
145 43 46 1.04 .00 .00 .00 .01 .00
148 46 49 .65 .00 .00 .00 .01 .00
JUNCTION NUMBER DEMAND GRADE LINE ELEVATION PRESSURE
1 3.37 369.95 110.00 112.64
4 3.68 369.95 120.00 108.31
7 2.73 369.95 130.00 103.98-
10 .73 369.95 133.00 102.68
13 2.13 369.95 125.00 106.14
16 .97 369.95 165.00 88.81
17 3.38 369.93 122.00 107.44
19 1.98 369.91 146.00 97.03
22 1.71 369.90 190.00 77.96
25 1.53 369.90 240.00 56.29
28 2.47 369.89 200.00 73.62
29 60.00 369.88 220.00 64.95
31 1.43 369.89 241.00 55.85
34 .81 369.91 180.00 82.30
37 .55 369.91 175.00 84.46
40 .94 369.91 160.00 90.96
A-3
Cantarini and Holly Springs Projects in the City of Carlsbad
Recycled Water Analysis
January 20, 2003
43 2.25. 369.91 220.00 64.96
46 .39 369.91 215.00 67.13
49 .65 369.91 240.00 56.29
MAXIMUM PRESSURES
1 3.37 369.95 110.00 112.64
4 3.68 369.95 120.00 108.31
17 3.38 369.93 122.00 107.44
MINIMUM PRESSURES
31 1.43 369.89 241.00 55.85
25 1.53 369.90 240.00 56.29
49 .65 369.91 240.00 56.29
THE NET SYSTEM DEMAND = 91.70
SUMMARY OF INFLOWS(+) AND OUTFLOWS(-) FROM FIXED GRADE NODES
PIPE NUMBER FLOWATE
100 91.70
THE NET FLOW INTO THE SYSTEM FROM FIXED GRADE NODES = 91.70
THE NET FLOW OUT OF THE SYSTEM INTO FIXED GRADE NODES = .00
A SUMMARY OF CONDITIONS SPECIFIED FOR THE NEXT SIMULATION FOLLOWS
THE DEMANDS ARE CHANGED FROM ORIGINAL VALUES BY A FACTOR = 4.30
THE RESULTS ARE OBTAINED AFTER 2 TRIALS WITH AN ACCURACY = .00000
Cantarini and Holly Springs Projects in the City of Carlsbad
Recycled Water Analysis
Peak Hour Demands
PIPE NO. NODE NOS. FLOWRATE
100 0 1 394.31
103 1 4 44.03
106 4 7 28.21
109 7 10 3.14
112 7 13 13.33
115 13 16 4.17
116 1 17 335.79
118 17 19 321.25
121 19 22 288.70
124 22 25 6.58
127 22 28 274.77
128 28 29 258.00
HEAD LOSS PUMP HEAD MINOR LOSS VELOCITY HL/1000
.79 .00 .00 1.12 .52
.01 .00 .00 .12 .01
.00 .00 .00 .08 .00
.00 .00 .00 .01 .00
.01 .00 .00 .15 .03
.00 .00 .00 .05 .00
.23 .00 .00 .95 .39
.25 .00 .00 .91 .36
.22 .00 .00 .82 .29
.01 .00 .00 .07 .01
.19 .00 .00 .78 .27
AS .00 .00 .73 .24
A-4
Canta.rini and Holly Springs Projects in the City of Carlsbad
Recycled Water Analysis
January 20, 2003
130 28 31 6.15 .00 .00 .00 .07 .01
133 19 34 24.04 .04 .00 .00 .27 .09
136 34 37 20.55 .05 .00 .00 .23 .06
139 37 40 4.04 .00 .00 .00 .05 .00
142 37 43 14.15 .01 .00 .00 .16 .03
145 43 46 4.47 .00 .00 .00 .05 .00
148 46 49 2.80 .00 .00 .00 .03 .00
JUNCTION NUMBER DEMAND GRADE LINE ELEVATION PRESSURE
1 14.49 369.21 110.00 112.33
4 15.82 369.20 120.00 107.99
7: 11.74 369.20 130.00 103.65
10 3.14 369.20 133.00 102.35
13 9.16 369.19 125.00 105.82
16 . 4.17 369.19 165.00 88.48
17 14.53 368.98. 122.00 107.02
19 8.51 368.73 146.00 96.52
22 7.35 368.51 190.00 77.35
25 6.58 368.50 240.00 55.68
28 10.62 368.32 200.00 72.94
29 258.00 368.27 220.00 64.25
31 6.15 368.32 241.00 55.17
34 3.48 368.68 180.00 81.76
37 2.37 368.63 175.00 83.91
40 4.04 368.63 160.00 90.41
43 9.68 368.62 220.00 64.40
46 1.68 368.62 215.00 66.57
49 2.80 368.61 240.00
.
55.73
MAXIMUM PRESSURES
1 14.49 369.21 110.00 112.33
4 15.82 369.20 120.00 107.99
17 14.53 368.98 122.00 107.02
MINIMUM PRESSURES
31 . 6.15 368.32 241.00 55.17
25 6.58 368.50 240.00 55.68
49 2.80 368.61 240.00 55.73
THE NET SYSTEM DEMAND = 394.31
SUMMARY OF INFLOWS(+) AND OUTFLOWS(-) FROM FIXED GRADE NODES
PIPE NUMBER FLOWRATE
100 394.31 .
THE NET FLOW INTO THE SYSTEM FROM FIXED GRADE NODES = 394.31
THE NET FLOW OUT OF THE SYSTEM INTO FIXED GRADE NODES = .00
A-S
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7 43 145
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40
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/ LEGEND
' . .. 37 '1-36 34
Q COMPUTER MODEL . . NODE NUMBER . ..
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31
COMPUTER MODEL \\ . •
. / PIPE NUMBER
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1 L•H / . / 29 Rn I 1—.-.......__._. \_ 57 )' .. ..•.:: I "A . 28 101 I I . -• .
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FIGURE 1
.. CANTARINI AND SCALE: 1 HOLLY SPRINGS PROJECTS
1 RECYCLED WATER SYSTEM / NODE AND PIPE DIAGRAM
CS2\\FS\DWC\726001 \FICuRE- 1 .DWG 01-17-03 13:28:12
APPENDIX B
COMMENT LETTERS AND RESPONSES
B-I
DEXTER WILSON ENGINEERING, INC.
DEXTER S. WILSON, P.E.
ANDREW M. OVEN, P.E.
STEPHEN M. NIELSEN, P.E.
MICHAELJ. FILECCIA, P.E.
January 17, 2003 726-001
Ladwig Design Group
703 Palomar Airport Road, Suite 300
Carlsbad, CA 92009
Attention: Bob Ladwig, President
Subject: Cantarini/Holly Springs Project Recycled Water Study Comments from
* City of Carlsbad, Design Division
This letter provides a written response to the comments.: on the September 24, 2002
Recycled Water Study for the Cantarini and Holly Springs Projects in the City of
Carlsbad. The comments were submitted by William E. Plummer, City of Carlsbad,
Deputy City Engineer, Design Division in .a memorandum to Jeremy Riddle, City of
Carlsbad, Associate Engineer dated November 12, 2002. A copy of the memorandum
is attached to this response letter. The memorandumaddiessed both the domestic
water study and the recycled water study. This letter will address only the comments
regarding the recycled water study. The domestic water study comments will be
addressed in a separate letter. The review comments for recycled water are numbered
and addressed below.
Recycled Water:
1. This change is made in the revised water study.
703 PALOMAR AIRPORT ROAD, SUITE 300 • CARLSBAD, CA 92009 • (760) 438-4422 • FAX (760) 438-0173
Bob Ladwig
January 17, 2003
Page 2
2. A discussion of the potential for providing an irrigation-type booster pump
station for higher elevations is included in the revised recycled water study.
The requested discussion is included in the revised recycled water study
The map, Exhibit A, presents all of the potential areas for recycled water use.
There are no additional common areas such as playgrounds or greenbelts that
could use recycled water for irrigation. The remaining areas of the project are
either natural open space, such as Lots A through F, or private property.
This change is made in the revised water study.
Please feel free to contact us if you have any additional questions about the comments
to our water study or to clarify any of our project recommendations. We look forward
to continuing to work with you through the planning process for the Cantarini and
Holly Springs projects.
Dexter Wilson Engineering, Inc.
Andrew Oven
AO:ndg
Attachment
November 12, 2002
TO: JEREMY RIDDLE, ASSOCIATE ENGINEERS
FROM: Deputy City Engineer, Design Division
DOMESTIC WATER AND RECYCLED WATER SYSTEM -• ANALYSIS CANTARINI AND
HOLLY SPRINGS PROJECTS
The domestic water and recycled water system analysis for the subject project dated
September 20, 2002 and September 24, 2002, respectively, was prepared by Dexter Wilson
Engineering, Inc. A review of the analysis has been completed. Following are our comments.
Domestic Water
On page 4, at the end of the second paragraph, delete the words "Carlsbad Public
Works Department" and substitute the words, "Carlsbad Municipal Water District".
All reimbursement funding for water and recycled water systems Will be from the District
and not the City's Public Works Department.
On page 5, last paragraph, last sentence, delete the words, "Carlsbad. Public Works
Department" .and substitute, "Carlsbad Municipal Water District".
On page 6, second paragraph, it states some homes will have less pressure than 60 psi.
in the 490-pressure zone. These lots shall be shown or highlighted on the map and the
number of lots impacted shall be listed in a table comparing ground elevation with
available pressure.
On page 6, under the title 375 Zone, delete the use of two new pressure reducing
stations and indicate that the 375 pressure zone shall be looped by constructing a
12" diameter pipeline in College Boulevard proceeding north from "C" Street to the
intersection of College Boulevard and Canon Road. The District will have a
375-pressure zone pipeline and supply at this intersect!on when the developer of
Calavera Hills Villages constructs CannOn Road. COnditions shall be placed on future
development along this reach indicating that they shall reimburse the developer of
Cantarini for this pipeline. .
On page 7, extend The 375-pressure zone pipeline in "A" Street and "B" Street to the
development boundary. Future development east and south of the development.
boundary will need the 375-pressure zone.
On page 8, delete-the discussion of the proposed pressure reducing stations. Extending
the 375-pressure zone pipeline in College Boulevard as noted previously will loop the
system. .
On page 9, in the last sentence of the first paragraph, delete the words, "there is no
current capital improvement project funded for its design and construction." The capital
improvement program presently includes Project No. 33761 and 33762 "D" Reservoir
Phase II to be designed and constructed in FY 2007-08. In addition, indicate that the ClP
also includes Project No. 38191 "Tap No. 2 Reservoir" for the 490-pressure zone.
Design and construction is scheduled for fiscal year 2005-06. The location of this
reservoir will be on the District's property located at the Maerkle Reservoir site.
On page 9, item 4, delete references to the "City of Carlsbad" or "City" and substitute the
words, "Carlsbad Municipal Water District". Also, add that the developer shall extend the
16" diameter 490-pressure zone pipeline from the tract boundary north to the
intersection of Cannon Road and College Boulevard. The District will reimburse the
developer for this pipeline.
Reôycled Water
On page 3, first paragraph, delete the last sentence and add the following: The District
will have a 16" recycled water pipeline in Cannon Road and a 12" recycled water
pipeline in College Boulevard at Cannon Road. Plus, the District's existing. "C" Tank
Reservoir is being converted to recycled water storage.
On page 3, second paragraph. It is correct that the District will not have a
higher-pressure zone available to this area; however, a local booster pump can be
installed to boost.the pressure from the lower 384-pressure zone.
On page 4, first paragraph, indicate that higher elevations can install a booster pump
that would be activated only when the irrigation system is activated.
On the map, show any common areas that will have non-native landscaping installed
where recycled water could be used. Indicate the potential area and water demand.
On page 6, second paragraph, add the following: The 12" recycled water pipeline shall
be extended north. in College Boulevard and connect to the recycled pipeline at the
intersection of College Boulevard and Cannon Road. .
414LLA&ME.'PLUIVI ER
Deputy City Engineer, Design Division
WEP:jd