HomeMy WebLinkAbout; ; Encina Water Pollution Control Facility Joint Advisory Committee ENCINA PLANT EXPANSION FINAL DESIGN REPORT; 1973-09-18n
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ENCINA WATER POLLUTION CONTROL FACILITY
JOINT ADVISORY COMMITTEE
ENCINA PLANT EXPANSION
FINAL DESIGN REPORT
1973
September 18, 1973
Prepared pursuant to
JAC's Request of August 22, 1973
NESTE, BRUDIN & STONE INCORPORATED
Engineers
ENGINEERING-SCIENCE, INCORPORATED
Engineers
for the for the
SAN MARCOS COUN'I'Y WATER DISTRICT LEUCADIA COUNTY WATER DISTRICT
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TABLE OF CONTENTS
CHAPTER
Scope of Work
Design of Enlargement
Table 2-1 -Design Criteria for
Phase 2-A Expansion
Schedule of Work
Calendar of Events
Cost Estimate
Table 4-1 -Estimated Phase
Construction Cost
Preliminary Financial Plan
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CHAPTER l
SCOPE OF WORK
At the request of the San Marcos County Water District and the
Leucadia County Water District a preliminary report was prepared
covering a possible 3.0 MGD enlargement of the Encina Water Pol-
lution Control Facility (WPCF). This report was prepared on the
assumption that these two agencies were the only entities desiring
to implement an immediate expansion of the plant, to be performed
concurrently with the construction presently underway, known as
the Phase 2 expansion. Phase 2 increases plant capacity from
6.75 MGD to 9.75 MGD. The Phase 2-A proposal would have increased
the total plant capacity to 12.75 MGD.
The preliminary report for Phase 2-A was presented to the Joint
Advisory Committee (JAC) meeting of August 15, 1973. In the
ensuing discussion, it became apparent that the cities of
Carlsbad and Vista also wished to secure additional capacity at
this time, indicating that the incremental expansion might be
more than 3.0 MGD. A committee was appointed to review this
concept with the staffs of the Regional Water Quality Control
Board and the Regional Coast Commission and to report back at the
special meeting on August 22, 1973. The results of these staff
meetings indicated that the 3.0 MGD was not a controlling factor
in considering a Phase 2-A expansion.
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Accordingly, the JAC committee requested that the consultants
(Neste, Brudin & Stone Incorporated and Engineering-Science, Inc.)
preparing the Phase 2-A report enlarge the scope of their study
to determine the feasibility of increasing the size of the en-
largement to 4.0 MGD, with the capacity allocation to be shared
by each of the four participating agencies, City of Carlsbad,
Vista Sanitation District, San Marcos County Water District and
Leucadia County Water District. This report, incorporating the
results of a preliminary review of .the potential for increasing
the scope of the enlargement to conform to this request, was
presented on August 29, 1973.
Accordingly, the City of Carlsbad, Vista Sanitation District,
San Marcos County Water District and the Leucadia County Water
District decided to each share a 4.0 MGD expansion equally. It
was decided to finalize this arrangement with a Sixth Supplement
to the Basic Agreement and that agreement now under discussion.
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BACKGROUND
CHAPTER 2
DESIGN OF ENLARGEMENT
Currently the Encina Water Pollution Control Facility is under-
going expansion. This expansion program (Phase 2, 1973) will
increase the plant's treatment capacity from 6.75 MGD to 9.75
MGD. At the completion of the Phase 2 expansion program, the
City of Carlsbad will own a 3.47 MGD share, Vista Sanitation
District will own a 3.05 MGD share, San Marcos County Water
District will own a 1.40 MGD share and the Leucadia County
Water District will own a 1.25 MGD share of the capacity rights.
These shares are inadequate to meet the existing and proposed
treatment commitments of the four agencies. The current rapid
growth experienced by all of these agencies indicates the need
for capacities in excess of those allocated under Phase 2 even
before the construction of this phase has been completed. How-
ever, there is apparently no way that any increase can be accom-
plished while the contractor is occupying the site for the Phase
2 construction, other than by an arrangement with the same con-
tractor to increase the scope of his work. Discussion with this
contractor indicates that it would be possible to accomplish such
an increased scope of work, provided that they know definitely
before they have proceeded into Phase 2 too far to incorporate
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the changes into the construction. The contractor has advised
that the last date for making such a decision is September 19, 1973.
To meet existing and proposed treatment needs through 1976, the
four agencies will need a total of at least 4 MGD additional
treatment and disposal capacity. A review of the facilities
as they will exist when Phase 2 is complete indicates that the
desired increased capacity could be attained by incorporating
the following added facilities:
Type of Improvement(a)
1. Primary Sedimentation Tank
2. Air Operated Primary Sludge Valve
3. Primary Scum Pump & System
4. Digester Boiler
5. Mechanically cleaned Bar Screen
(20 MGD Capacity)
Additional
Units Required
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Based on process and hydraulic review and discussions with the
San Diego County Department of Sanitation and Flood Control and
on data from the Phase 2 design engineers, the balance of the
Encina Water Pollution Control Facility, including plant and
land/ocean outfall system, will be capable of handling a 4 MGD
incremental flow increase with no additional modifications at
this time.
(a) Selection of actual equipment and verification of details
as to location and conformance with existing processes to
be made prior to final design.
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DESIGN CRITERIA
A review of available information indicates that the present
primary sedimentation basins have a capacity of 2.5 MGD each when
operated at a surface overflow rate of 780 gpd/ft2 , at a detention
time of 2.0 hours. The Phase 2-A plan is flexible to the extent
that it can be sized for a 4.0 MGD incremental increase needed
to accommodate the desires of those member agencies in need of
immediate expansion. Preliminary design criteria for the pro-
posed additions are summarized in Table 2-1. Based on available
capacity after Phase 2 expansion, no additional expansion to the
land and ocean outfall system will be required.
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TABLE 2-1
DESIGN CRITERIA FOR PHASE 2-A EXPANSION
FLOW (MGD)
Average Dry Weather
Peak Dry Weather
Peak Wet Weather
PRIMARY SEDIMENTATION TANKS
Number
Size (feet)
Overflow Rate (gpd/ft2)
ADWF
PWWF
Detention Time (hours)
ADWF
SCUM PUMP
Number
Capacity (gpm) at 60' TOH
Horsepower
DIGESTER BOILER
Number
Size (BTU/Hour)
BAR SCREEN
Number
Capacity
6
4 MGD
INCREMENT
13.75
21.1
34.8
1 Add.
20W X 160L x 9SWD
860
2175
1.9
1 Add.
15
1.5
1 Add.
1,000,000
1 Add.
20 MGD
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CONSTRUCTION SCHEDULE
CHAPTER 3
SCHEDULE OF WORK
It is estimated that final design of the Phase 2-A Interim Ex-
pansion can be completed by September 28, 1973. Construction
completion is contingent upon coordination with the existing
Phase 2 expansion program. Preliminary estimates for construction
completion define an early complete date as July 1974, and a late
complete date as October 1974.
Early completion of final design is important in order that the
additional items of work can be scheduled into the existing
construction program, taking maximum advantage of like items of
construction activity, thereby minimizing duplication of con-
struction effort and cost. For this reason, authorization to
proceed with final design should be given at the earliest
possible date.
CALENDAR OF EVENTS
A calendar of events critical to the implementation of the Phase
2-A Interim Expansion Program has been prepared to aid in coordi-
nating the efforts of the various entities involved in this project.
The project is proceeding on schedule.
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CALENDAR OF EVENTS
PHASE 2-A EXPANSION PROGRAM
ENCINA WATER POLLUTION CONTROL FACILITY
1. File for Waste Discharge Requirements
with the California Regional Water Quality
Control Board, San Diego Region
2. File for Coastal Permit with Coastal
f1 Commission
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3. Legal Opinion
4. Agreement between Districts and Agree-
ment for Engineering Services -
initiate design Leucadia CWD
San Marcos CWD
5. Meeting with San Diego County Department
of Sanitation & Flood Control, and Brown
and Caldwell
6. Financial Plan -Buy-in capacity of ad-
ditional units Preliminary
Final
7. JAC Meeting
8. Preliminary Design Report -Draft
Final
9. JAC Meeting
10. JAC Meeting
11. Meeting with Brown & Caldwell
12. JAC Meeting
13. Draft EIR -Adopt by SMCWD
14. JAC Approval of Phase 2-A Expansion Plan
15. Coastal Commission Hearing
16. EPA Ocean Discharge Permit
17. Design Completion
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July 3, 1973
July 3, 1973
July 30, 1973
July 30, 1973
August 6, 1973
August 2, 1973
August 15, 1973
As Required
August 15, 1973
August 15, 1973
As Required
August 22, 1973
August 29, 1973
September 6, 1973
September 12, 1973
September 17, 1973
September 19, 1973
September 21, 1973
September 21, 1973
September 28, 1973
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18. Receive Waste Discharge Requirements
Tentative
19. Final Construction Cost Estimate
20. Final EIR -Adopt by SMCWD
21. Construction Completion -Early
-Late
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To Be Determined
October 8, 1973
October 16, 1973
July 1974
October 1974
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CHAPTER 4
COST ESTIMATE
The preliminary construction cost estimate for the proposed
Interim Expansion Program as outlined in Chapter 2 is $385,000.00.
This cost estimate was prepared by Weardco Construction Corpo-
ration prior to completion of preliminary plans. The costs have
been reviewed and modified by the Engineer to reflect the added
costs of preliminary design details. Due to the atypical nature
of the design effort, an accurate estimate of the engineering
design costs cannot be made. However, it is estimated that total
project cost will be approximately $500,000.00 for the 4 MGD
increment, all as summarized in Table 4-1.
Upon design completion and JAC approval it is contemplated that
the SMCWD will negotiate a contract with Weardco, Inc. for the
Phase 2-A construction. This action will provide the additional
Phase 2-A capacity at the completion of the present Phase 2
construction, estimated between July and October of 1974.
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TABLE 4-1
ESTIMATED PHASE CONSTRUCTION COST
ITEM
1. Mechanical Bar Screen
2. Pre-aeration Blowers
3. Chlorination
4. Grit Removal Tanks
5. Screen, Blower & c12 Building
6. Primary Sedimentation Tanks
7. Effluent Metering
8. Foul Air Handling
9. Solids Handling Building
10. Piping & Conduits
11. Electrical
12. Instrumentation
13. Site Work & Demolition
14. Painting
15. Flood Protection
Sub-Total
16. Engineering, Contingencies,
Legal, etc. (30%)
TOTAL
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Phase 2-A
4.0 INCREMENT
$ 50,000
3,000
205,000
10,000
40,000
60,000
10,000
5,000
2,000
$ 385,000
115,000
$ 500,000
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CHAPTER 5
FINANCIAL PLAN
A proposed method of computing cost to permit Vista Sanitation District,
City of Carlsbad, San Marcos County Water District and Leucadia County
Water District to obtain additional capacity rights in the Encina Water
Pollution Control Facility (Phase IIA).
Additional Capacity Rights Needed
Existing Needed Total
1. Vista Sanitation District 3.05 MGD 1.00 MGD 4.05 MGD
2. City of Carlsbad 2 .43 MGD 1.00 MGD 3 .43 MGD
3. San Marcos County Water District 1.40 MGD 1.00 MGD 2.40 MGD
4. Leucadia County Water District 1.25 MGD 1.00 MGD 2.25 MGD
5. Encina WPCF 9.75 MGD 4. 0 MGD 13 • 7 5 MGD
Assumptions and Criteria
(1) Engineering News Record Construction Index for the Los Angeles area U used for past, present and future valuations.
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(2) Original bid construction date April, 1964, ENR=lOOO.
(3) Facilities first used September, 1965, basis for depreciation.
(4) Equipment depreciated over a 20-year life.
(5) Pipe and Structures depreciated over a 40-year life.
(6) Phase I bids received September, 1970, ENR=l440.
(7) Phase II bids received May, 1973, ENR=l950.
(8) Phase II to be completed July, 1974.
(9) All valuations projected to September, 1973, ENR=2175.
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Original Encina Facility
(1) Basic Value
Plant Site and Condemnation
Access Road, Power Pole Reloc., Appraisal
Mi.sc. Improvements & Capital Purch.
Portion of Engineering Cost
Capital Improvements
Junction Structure
Primary Sludge P~mp
Primary Digester
Secondary Digester
Control Building
Drainage
Site Grading
Yard Piping
Fence, Landscape, Roads
Electrical
(2) Depreciation (September 1965 to September 1973) 8 years
Equipment
Sludge Pump Facilities
Control Building
Electrical
$ 10,000
s,ooo
10,000
$ 25,000
$25,000 X 8/20 = $10,000
Remainder 485,000 x 8/40 = $97,000
Sub-Total $107,000
$240,000
10,000
12,000
60,000
8,050
25,000
54,800
59,500
59,700
8,500
37,000
90,000
45,900
40,000
$750,000
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Project to 1973 Value
2175 ENR lOOO = 2.175 x 107,000
(3) Inflation (not including -land) (1000 to 2175)
(750,000 • 240,000) X 11,.5%
(4) Summary
Basic Value
Depreciation
Inflation
Plus land appreciation
Phase I Expansion
$750,000
-232,700
+600,000
' $1,117,300
89,000
$1,206,300
(1) Basic Valu.e (September 1970 to September 1973)
Capital Improvements, Engineer, Administration
(2) Depreciation
Equipment 8500 x 3/20 =
Remainder 103,000 x 3/40 =
Sub-Total
Project to 1973 value
2175 ENR 1440 • 1.5 x $9,000
(3) Inflation (1440 to 1950)
188,000 X 50%
(4) Summary
Basic Value
Depreciation
Inflation
$ 1,300
7,700
$ 9,000
$188,000
13,500
+ 94,000
$ 268,500
$232,700
$600,000
$ 188,000
$ 13,500
$ 94,000
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Phase II Expansion
(1) Basic Value
Capital Improvement
Engr., Legal, Admin.
Less Meter
(2) Depreciation
(3) Inflation
(4) Summary
Basic Value
Depreciation
Inflation
Total Plant Value
(1) Original
(2) Phase I
(3) Phase II
Total
Cost Sharing
Agency
Carlsbad
Percentage
Phase II
San Marcos CWD
Leucadia CWD
24.92
14.36
12.82
$685,300 ·
-10,000
$ 675,300
-o-
-0-
$675,300
-0-
-0-
$675,300
$1,206,300
268,500
675,300
$2,150,100
Ownership
Phase IIA
24.95
17.45
16.36
Carlsbad
San Marcos
Leucadia
+ . 0003 X 2, 150, 100 = 645
+ .0309 X 2,150,100 = 66,438
+ .0354 X 2,150, 100 = 76,113
Total $143,196
Percentage Change
in Ownership
.03
3.09
3.54
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Allocation of
Agency
Vista
Buena
Encinitas
Summary
Agency
Vista
Carlsbad
Buena
San Marcos
Leucadia
Encinitas
Buy-in Cost
Buy-in Paid
by Carlsbad
$177
$180
$288
$645
Phase IIA
Cost
$125,000
125,000
-0-
125,000
125,000
-0-
$500,000
to Owners
Buy-in Paid
by San Marcos
$18,158
$18,456
$29,824
$66,438
Buy-in
Returned
+ $ 39,136
-o-
+ 39,780
-o-
-0-
+ 64,280
$143,196
Buy-in Paid
by Leucadia Buy-in Total
$20,801 $39, 136
$21,144 $39,780
$34, 168 $64,280
$76,113 $143,196
Buy-in Net Cost (-)
Cost or Refund (+)
-o-(-) $ 85,864
+ 645 (-) 125,645
-o-(+) 39,780
+ 66,438 (-) 191,438
+ 76,113 (-) 201, 113
-o-(+) 64,280
$143,196 $500,000