HomeMy WebLinkAboutM1984-0721 - 02/01/1984s
MOTIONS - 2/1/84
•
17. Approving the capital improvement plan for the Sanitary Sewer System as
proposed on the January 5, 1984 memorandum; subject - Wastewater System.
SEp 19 1364
$4 -0721
MICROFum,
0 •
TO: Honorable Mayor Luther Jones & DATE: January 26, 1984
Council Members
FROM: James K. Lontos P.E., Assistant City Manager
SUBJECT: Wastewater System
Two planning projects recommended in the Wastewater System Capital Improvement
Program which obviously have raised the concerns of the Staff and a number of
citizens are (a) Oso Plant Facility Plan, and (b) Master Plan South of Oso Creek,
as shown on the previously submitted Wastewater System report.
After further review of the need for both of these projects, it appears that if
separate projects are approved (a) Facility Plan for Oso Plant, and (b) Master
Plan South of Oso Creek, each of the two projects must consider the facts relating
to the other. In other words, a Facility Plan for the Oso Plant should consider
all factors regarding further expansion including how the area along either side
of the Oso Creek could be served in the future by wastewater lines. It may be
possible that a portion of the area just north of Oso Creek could be changed
from the present Master Plan and be diverted to another plant if one is proposed.
At the same time, if the Master Plan Study indicates that another wastewater
treatment plant is essential to handle the growth on the south side of Corpus
Christi, then a facility plan for the Oso must consider the effect this plant
would have on future expansion of Oso.
For this reason, it appears that both projects should be combined and a general
overall report be prepared that answers questions about any future expansion of
the Oso Plant and the development of a Master Plan along the Oso Creek. The same
engineering firm could be working on a plan taking into consideration all factors
of growth on the south side; therefore, it is recommended that the two projects
that are submitted in the Wastewater System report dated January 5, 1984 be
combined into one and be entitled "Wastewater Master Plan Along Oso Creek & Study
of Future Expansion of Oso Plant ", at an approximate cost of $155,000.
James K. Lon s, P.E.
Extension 385
JKL /ajr
TO Honorable Mayor Luther Jones &
Council Members
FROM Edward A. Martin, City Manager & DATE January 5, 1984
James K. Lontos, P.E., Assistant City Manager
SUBJECT Wastewater System
One of the major goals of the City Council is a New Wastewater Treatment Plant and
in general a review of our entire sewer system. To generalize on the system's
condition is difficult. Reports on specific phases of the system can easily be
written identifying problem conditions and offering solutions, but to give an overall
analysis of the system in detail would be rather difficult. This memorandum will
attempt to give you a short summary of both treatment and collection, identify the
basis general problems with both, and then end with a summary of recommendations in
the form of additional Capital Improvement Projects in the foreseeable future.
I. TREATMENT
The City of Corpus Christi presently has eight wastewater treatment plants,
including one package treatment plant, in use. These plants are basically
secondary treatment facilities using either trickling filter or activated sludge
type treatment. Major improvements and /or expansion programs have been completed,
are in progress, or are currently being planned on every one of the plants in
the City. The increased discharge standards of the 1972 Water Pollution Control
Act have had an impact on the plants. All of the expansion programs have been
in accordance with the regulations promulgated by the Environmental Protection
Agency. The new regulations include the following increased restrictions critical
to our plants.
1) Pollutants reduced at least 907. before discharge.
2) BOD (Biochemical Oxygen Demand) maximum allowable 20 ppm.
3) SS (Suspended Solids) maximum allowable 20 ppm.
4) Liability Class I - Rating received when discharging into (a) shellfish area,
(b) recreational area, (c) industrial harbor. This rating requires that all
effluent be treated, never bypassed, that the plant be protected from a
100 year flood and that a dual power source be installed from an outside source.
A. BROADWAY SYSTEM
The Broadway Treatment Plant, located on West Broadway between Sam Rankin and
Resaca, is a trickling filter plant having a nominal design capacity of ten
million gallons per day (MGD) and a hydraulic capacity of fifteen MGD. The
Broadway is classified as a Liability Class I Plant since it discharges into
an industrial harbor (the port) which adjoins Corpus Christi Bay, a recreational
area. Since initial construction in 1936, major alterations and additions to
the plant have been made in 1940, 1950 and 1954. Because of its age and because
of the Corpus Christi Beach infiltration, the plant had deteriorated badly and,
thus, needed improvement. In 1978 and 1981, two major expansion contracts were
awarded which included construction of a new primary clarifier, rehabilitation
of four standard rate filters, replacement of four final effluent pumps and
motors and rehabilitation of the entire plant to phase into the new structures.
Total cost of these improvements was approximately $7 million.
Wastewater System
*ge No. 2 •
New structures include a sand filter at the end of the plant, a lift station
at the head of the plant, intermediate lift pumps, an aerobic digester system,
a sludge drying system, and new headworks including a grit collector and return
flow reconditioner. The first contract is complete, as is the work in Corpus
Christi Beach. The second contract is still underway and near completion.
In addition, a wastewater collection system was installed on Corpus Christi
Beach which ties into the Broadway Plant. Three new lift stations and a force
and gravity main system were installed to serve this area at a cost of
$1 million. These improvements did not increase the capacity of the plant,
but did provide tertiary treatment to meet the Federal requirements.
B. OSO WASTEWATER TREATMENT PLANT
The Oso Plant, located near Ennis Joslin and Nile Drive, is the largest plant
in the City. It is being enlarged to treat 16.4 million gallons per day.
Because of the plant's effluent discharge into the Oso Bay, which is a shell-
fish area, it is classified Liability Class I, thus, having stricter require-
ments than an average plant. The plant is affected mostly by the growth in
the southside area. Over a number of years the City acquired all of the land
from the Plant to the existing Pharaoh Valley Subdivision and the Oso Golf
Course, to provide for its future expansion and to further create a buffer
zone restricting development, thus, reducing citizen complaints.
Five separate contracts have been awarded since 1979 to expand the average
plant capacity from 12 MGD to 16.4 MGD with a storm peak flow of 98 MGD. Total
cost of these improvements is approximately $20 million. This plant treats
517 of the City's wastewater. Two of these five contracts provided for plant
expansion. The other three involved construction of new and /or renovation of
existing lift stations and a force and gravity main system to expand the service
area of the plant. These improvements will provide expanded plant capacity to
serve the southside area of the City.
In addition to the above contracts, the sliplining of the McArdle trunk line
is in the process with two additional contracts, one completed and the second
underway, totaling $3.5 million.
The initial engineering work and studies resulting in the present enlargement
of the plant were initiated approximately ten years ago. The growth in the
southside during the last ten years is bringing the plant again to near design
capacity. Because of the projected growth in the area, it is essential that
steps be taken to begin work necessary for the next expansion. A project is
listed in the proposed Capital Improvement Program to respond to this need.
Problems related to collection system will be treated separately under
Collection System in this report.
C. ALLISON WASTEWATER TREATMENT PLANT
The S. L. Allison Wastewater Treatment Plant, located on McKenzie Road serving
the northwest section of the City, is a contact stabilization treatment facility
constructed in 1966, with a design capacity of 2 MGD, It is the newest plant
and serves the fast growing Northwest Area of the City. It has a capacity of
two million gallons per day. Many operational problems have occurred, the
result of which has been the issuance of a number of non - compliance citations
by the Texas Department of Water Resources, to the City.
Wastewater System
&ge No. 3 .
Recently, two contracts were awarded for interim improvements at the Allison
Plant. One contract was for construction of a new aerated lagoon in series
with an aerated pond at a cost of $250,000. The second provides for a new
clarifier, modification of a chlorine contact chamber and various piping and
electrical work, at a cost of $447,000. Both of these contracts are considered
interim improvements designed to improve effluent quality until permanent
expansion and improvements can be completed.
Plans and specifications for permanent improvements are complete. The plant
is to be expanded to 5 MGD which is determined to be adequate to handle growth
in the service area for the foreseeable future. All permits have been received
and the plans have been approved by the Texas Department of Water Resources.
We have been very active with the Texas Department of Water Resources in
attempting to have this project offered a grant. Numerous meetings have been
held and all preparatory work is done. It now appears that a grant for
permanent improvements will be received, since the plant is rated high on
the priority list.
D. WESTSIDE WASTEWATER TREATMENT PLANT
The Westside Plant, located at the intersection of Saratoga and Greenwood,
was constructed in 1957 as a trickling filter plant with a design capacity of
3 MGD. General improvements to the plant began in May, 1978 and were completed
in April, 1981 at a cost of $900,000. An automatic backwash filter was
installed to provide an additional step in the treatment process. This will
provide for future expansion which is planned within the next two years. The
1982 bond program provides $3.2 million to increase the capacity from 3 MGD
to 5 MGD.
Engineering selection for the design of the expansion should take place
early in 1984. The plant serves the general area along Padre Island Drive
from Ayers to I.H. 37 and north to Up River Road.
E. FLOUR BLUFF (LAGUNA MADRE) PLANT
The Flour Bluff Plant is one of two plants that serve the Flour Bluff area.
This plant, built in 1971, is a contact stabilization plant with a design
capacity of 500,000 gallons per day.
A major expansion contract has been awarded to Basic Constructors, Inc. of
Houston, Texas totaling $4,250,000. The plant capacity will be expanded from
500,000 GPD to 3 MGD with a peak flow of 9 MGD. Expansion includes new
clarifiers, aeration basins, 28 new sludge drying beds, force and gravity
mains, and an office and control building. The existing lift station on
Military Drive will be renovated and a new lift station will be built on
Flour Bluff Road between Purdue Road and Glenoak Drive. A grant from the
Environmental Protection Agency has been received which will fund 75% of the
total cost of improvements. Receipt of this grant was not anticipated
during preparation of the 1982 Capital Improvements Program. This has freed
approximately $3 million in local funds which can be used for additional
projects, as outlined later in this report.
Wastewater System f
0age No. 4 l
F. LAGUNA SHORES WASTEWATER TREATMENT PLANT
The Laguna Shores Plant, built in 1967, is similar to the Flour Bluff Plant
but has a design capacity of 300,000 GPD. When the Laguna Madre Plant is
expanded, this plant will be converted to a pumping facility to pump raw
wastewater by force to the Laguna Madre Plant for treatment.
G. PADRE ISLAND TREATMENT PLANT
This plant, located on Whitecap Boulevard near the Laguna Madre, is a
500,000 GPD contact stabilization plant that was constructed by the developer
of the Padre Island Subdivisions, Padre Island Development Corporation. Control
and operation has been assumed by the City and the area has been annexed.
Under agreement with Padre Island Investment Corporation and the City, Padre
will construct the next phase of enlargement at their cost, as required. Such
construction must commence when the present plant exceeds 80'/, of its capacity
for three consecutive months. This has occurred this year. •Plans for the
first phase expansion are prepared now by Padre Island Investment.
II. COLLECTION SYSTEM
The collection system for each plant consists of gravity lines and lift stations
with force main. The lines are generally laid on very flat grades because of the
flat terrain with lift stations as needed, in order to reduce the depth of gravity
lines and save on cost of construction. Most of the gravity system is of vitrified
clay pipe with the exception of a number of large concrete trunk lines which will
be the subject of discussion separately. There are some sections of polyethylene
pipe, cast iron, and at least one short section of smooth flow corrugated metal
pipe and a test section of truss pipe. A clean bill of health can not be given
to the collection system in this report or any other. There are a number of prob-
lems with some sections of the system. Infiltration causes sewage overflows during
rain, growth in the downtown area would eventually cause the system to be overloaded
and relief lines could be essential downtown. Roots in the smaller lines must
impede the flow and eventual rehabilitation programs may have to be undertaken.
All of this is not to say that the system is in bad shape; I believe the collection
system is in a relatively good shape, but continuous maintenance and upgrading is
essential.
The sanitary sewer collection system has undergone major revisions and improvements
and additional improvements are being planned. There are a number of major collector
trunk lines which were installed 20 to 40 years ago and made of concrete. Over
the years it has been our experience that concrete pipe, when used in a sanitary
sewer collection system for gravity flow of sewer in an environment like the City's,
has not been adequate. The hydrogen sulfide gasses produced from the sewer flow
and the resultant chemical reaction with the concrete erodes the top of the
concrete pipe over a period of years and causes severe deterioration! The McArdle
Line, the Greenwood Trunk Line, and the Oso and Nile Lines are all concrete. When
the top of the line begins to deteriorate, the pipe collapses along with the asphalt
pavement which results in a cave -in. This has happened along the McArdle Line
and most recently the Oso Line.
Several factors must be considered in the design of a sewer collection system. When
choosing the type of pipe to be used, it is important that the properties of the
pipe contribute to a permanent, trouble -free system. Generation of hydrogen sulfide
Wastewater System
0 / •
age no. 5 l
is the most critical element in the protection of the sewer pipe. Other factors
include temperature, strength, age and pH of the sewage, velocity of the flow and
Sulfate concentration. Ordinary domestic sewage from an average home can contain
scalding water, drain openers, scouring powders, detergents, bleaches and other
household chemicals. Industrial waste discharges can contain chemicals, solvents,
acids and alkalis. All these chemical products can attack flexible pipe and some
rigid pipe such as plastic, metal or cement bonded materials.
Primarily, the type of pipe used in the City of Corpus Christi for the sewer
collection system is clay pipe. Clay pipe hardly ever wears out. Although it is
produced in smaller diameters and sections than concrete or plastic pipe, it is a
highly stable pipe and will not deflect under trench load. When installing plastic
or PVC pipe, extreme care must be taken in the installation process to be sure that
the bottom of the trench where the pipe will rest is exactly level and that the
backfill is done properly. The soil around the pipe must be compacted to at least
95% of its maximum density. Plastic pipe requires lateral support to limit vertical
deflection. If this is not done correctly, the plastic pipe has a tendency to
squash down or deflect, thus, reducing the capacity of the pipe. The temperature
of the water flowing through the pipe has an effect on plastic pipe causing it to
expand and contract reducing the integrity and strength of the pipe. Discharges
from washing machines, showers and dishwashers produce a temperature of from 80 ° -90°
at times. Clay pipe is not affected by high water temperatures. Since it is an
inert material, it is impervious to chemicals and cannot be destroyed. It is highly
abrasion- resistant, impervious to corrosive soils and will not be affected by sewer
cleaning equipment.
Clay pipe has two disadvantages when compared to concrete or plastic pipe. First,
it is more expensive to install because it is produced in shorter lengths. Second,
because of the number of joints required, the chance for storm and ground water
infiltration is greater.
Following is a brief description of the specific problems relating to the concrete
sewers in the system and also a summary of the City's Television Inspection System.
A. McArdle Road S anitary Sewer Line
The McArdle line is a 42" concrete trunk which carries wastewater to the Oso
Plant. It was built in 1962 to relieve the Staples Street sewer and connects
with a major branch of this line at the intersection of Carroll Lane and Houston
Street. In 1976, the City adopted a facility plan for improvements to the Oso
Plant which included rehabilitation of the McArdle Line. The facility plan
indicated the seriousness of the condition of the line. Deterioration of the
line was so bad that the reinforcing steel was exposed in places. To reduce
the hvdrogen sulfide corrosion, hydrogen peroxide was injected into the pipe
at various locations. From 1974 to 1978, six major failures in the line
occurred. When the line was televised, the extent of the deterioration was
revealed. Plans to slipline the 42" concrete pipe with a 36" thick -wall poly-
ethylene pipe were prepared.
Sliplining is a process involving insertion of the polyethylene pipe into the
concrete pipe. The pipe is delivered in 35 to 40 foot joints. Prior to
insertion, the joints are joined together by heat fusion to form a length of
pipe long enough to reach from one manhole to the next. The space between the
concrete and liner pipe is then sealed with cement grout, making a gas -tight
section between manholes and eliminating further corrosion of the concrete
Wastewater System
age No. 6 •
pipe from hydrogen sulfide gas. This method was chosen for the McArdle Line
because of the limited right -of -way available. This small space prevents open
cutting the street to replace the pipe. The project limits were from Carroll
Lane to Diile Drive. Plans called for rehabilitation of all manholes and grouting
of the voids between the pipe and the liner. The first contract was awarded in
February, 1979 to Shur -Flo, Inc, and John G. Holland Construction Company of
Houston at a cost of $1 million. It was completed in May, 1980. The contract
for the second phase was awarded in May, 1981 to McCullough Contracting Company
for $2.5 million. This contract is still under way. Numerous cave -ins have
occurred on the line and the contractor has filed a suit in Federal district
court for damages. The work is approximately 80% complete.
B. NILE DRIVE & OSO TRUNK SE14ER
The Nile Drive and Oso Trunk Line is a 48" and 42" concrete trunk line which
runs from the intersection of Everhart and Bonner down Curtis Clark and
Williams Drive and connects to the Oso Plant. The pipe increases to 48" as it
approaches the plant. It serves the area between Holly Road and Padre Island
Drive from Oso Creek to Ayers, including Schanen Estates, or approximately
5800 acres. The line was constructed in 1955 at a cost of $362,000. It is a
concrete line similar to McArdle and is showing the same signs of deterioration
as the McArdle Line. A large amount of sludge accumulates on the bottom of
the line which, at times, impedes flow and increases the opportunity for creation
of hydrogen sulfide gasses. This line is on the priority list for a Federal
rant, and has a very low rating. It is possible, however, that a grant could
be issued if local funding is available and the construction plans are complete.
Under Capital Improvements section of this report, a project is included for
engineering services for design.
C. GREENWOOD TRUNK LI -E
This is also a large concrete sewer line, but because of its limited flow it
appears that the deterioration is not as severe as the McArdle or Oso Trunk;
therefore, no immediate remedies are proposed, but rather a close monitoring
system to gauge its condition in the future.
D. TELEVISION INSPECTION SYSTEM
In 1978, the City purchased a television video system housed in a mobile van.
The camera is capable of televising lines from 6" to 42" in diameter and
produces a video film on cassette. The film can be monitored in the van or
in the office. The television equipment was purchased to detect and seal
leaks in the sewer system which allow rainwater, ground water and storm sewer
overflows to infiltrate the sewer collection system placing a heavy load on
the treatment plants. The equipment is used to locate trouble areas in the
existing system, to determine the condition of existing lines in preparing a
preventative maintenance program and to inspect sewer lines in new subdivisions.
The basic crew consists of two employees. It has been determined that this is
not the optimum size crew and that an additional employee is needed for maximum
productivity. Depending on the type of work involved, the two -man crew may be
supplemented by additional personnel particularly in locating stoppages and
breaks in the older lines. The crew has been averaging 4500 feet of lines
televised per month. Of this footage, about 60% is new line and 407. existing
mains.
Wastewater System
Oge No. 7 0
Prior to purchasing the camera, Wastewater Division personnel inspected all
new subdivision lines using sunlight, high intensity lamps and mirrors. When
the camera became available, all new subdivision lines were televised. The
Division has found that a satisfactory inspection can be made in less time
using mirrors for an initial inspection and using the television camera only
on those lines where the visual inspection indicates a problem or where
because of curves in the line, a visual inspection is not possible.
On old lines, the camera has proven to be very effective in locating breaks,
misaligned pipe, obstructions, and broken taps. A line in service must be
open sufficiently to enable a cable to be pushed or floated through the line
to pull the camera to a trouble spot.
When wastewater treatment plant expansions are completed and sufficient
pumping capacity is installed at the plants to eliminate the necessity to hold
sewage back in the lines during peak periods and catch up at night during low
flows, the camera will be used to inspect the large transmission lines,
particularly concrete, in use in the system.
The workload in the Wastewater Division this fiscal year has been greater than
anticipated in the number of new subdivisions and taps being added to the
system and with the extremely dry weather the number of repairs made in the
older lines. Overtime has been extensive and supplemental manpower and equip-
ment has not been available to assist the television crew. These concerns
have been addressed as the 1983 -84 budget was prepared. It is the Division's
goal to increase footage televised to a minimum of 10,000 feet monthly with
the increased televised footage being in the older system.
III. PROPOSED CAPITAL IMPROVEMENT PROGRAM
A total of $5,950,000 was approved in the 1982 bond election for the Flour Bluff
Plant expansion. In March of this year, the Environmental Protection Agency
issued a grant which represents 75% of the total cost of plant expansion,
including engineering fees and contingencies.
A plan for the strategic use of the funds freed by the issuance of the bonds is
formulated. The plan takes into consideration some of the needs in each collection
system as identified and evaluated by Staff. Planning essential for the orderly
growth of the City, as well as preliminary engineering and facility plans for
the Oso, which may be prerequisite of an EPA grant, receives in my opinion high
priority, followed by projects in Flour Bluff, Padre Island, and the other systems.
A detailed description of each project is included. It is proposed to use $2.9
million to improve the collection systems in Flour Bluff, on Padre Island, and
in the Oso, Broadway and Allison Systems. Also included in this plan is the
preparation of the Facility Plan for the next phase of expansion at the Oso
Wastewater Treatment Plant and engineering fees for sliplining the Oso and Nile
Drive Trunk Lines, and updating the Wastewater Master Plan. The rapid growth
in the Flour Bluff area has created a large demand for sewer service. Completion
of the plant expansion will allow more trunks to feed into the plant, thus,
providing sewer service to a larger area of Flour Bluff. The major portion of
the proposed additional work is in the Flour Bluff area. The following projects
are proposed.
A. PLANNING PROJECTS
1. Engineering for Sliplining of Nile Drive & Williams Drive Lines - The
Wastewater System •
Page No. 8
lines are 48" and 42" concrete pipe. Rehabilitation is proposed
by inserting polyethylene lining material into the existing re-
inforced concrete sewer lines. This would involve approximately
4500 feet of 48" pipe and 17,500 feet of 42" pipe. The project is
on the State's priority list, and completion of engineering work
and plans, plus the availability of funds from the State Level,
could move the project up in rating for a grant. The line recently
had a serious cave -in indicating that the same deterioration as the
McArdle line could be taking place. The project is for preliminary
and design work only. Estimated Cost ..................$ 225,000
Oso Plant Facility Plan - A preliminary plan for future expansion
of the Oso Plant is needed. With the rapid growth of the south
part of the City, planning for expansion beyond the current design
year must begin now. The plant flow is approaching design capa-
city even before the plant is finished; therefore, planning for
the future is essential. Questions have been raised regarding future
expansion of the plant. The area the plant now serves is still
largely undeveloped but future development is anticipated. EPA
would eventually participate in this cost, probably 55% EPA
and 45% City. Estimated Cost ..................$ 55,000
Master Plan South of Oso Creek - Development is pushing to Oso
Creek at this time. In the foreseeable future development is
expected to cross the Oso. There are no provisions for wastewater
treatment or collection south of Oso Creek. For a City to orderly
grow with some guarantee of protection of its citizens against
pollution it is important that planning must take place in terms
of how this area could be served by wastewater. The City Council's
goals include the construction of a new wastewater treatment plant.
Development of a master plan of this area of rapid growth will
enable the Council to determine the most logical location to extend
new services and whether a new wastewater plant is needed.
Estimated Cost ..................$ 100,000
$ 380,000
B. FLOUR BLUFF & PADRE ISLAND SYSTEM PROJECTS
The Flour Bluff collection system is a relatively new system and major
deficiencies are related to developed areas that do not yet have sani-
tary sewer service available. Since laterals for the Don Patricio area
were included as a separate project in the 1982 bond program, they are
not listed here. Other lateral line projects are listed.
The Padre Island System is also a relatively new system with no appar-
ent problems in the collection system. All existing sewers on Padre
Island were installed by Padre Island Development Corporation to meet
City of Corpus Christi design standards. There were no projects
approved in the 1982 bond program to provide sewers for existing sub-
divisions on the Island that were not a part of the Corporation's
development. It is proposed to establish a project to provide service
to Padre Island No. 1 and No. 2 Subdivision now that they are within
the existing city limits.
Wastewater System
of age No. 9
1. Laguna Vista Shores & Holidav Harbor - Various sized lines are
needed to serve the area on either side of Laguna Shores Road
and Shore Drive between Riverdale and Yorktown. A lift station
and force main system has previously been constructed which
provides for the main trunk and transmission lines in the area.
Estimated Cost ................. $ 400,000
2. Bayside Acres 1 & 2 - This area is near Yorktown and Laguna
Shores Road. There are a number of homes existing in this area
without sewers. A number of lots have been platted prior to
annexation that can not be developed without a sewer collection
system. The sewer mains will serve existing and expected
development. Estimated Cost... ............... $ 455,000
3. Bluewater Subdivision Sewer Mains - This subdivision is also near
Laguna Shores and Yorktown, will be served by approximately 1860
feet of sewer mains to serve existing homes.
Estimated Cost ................. $ 175,000
4. LaSuuna Shores Treatment Plant (Lift Station The rehabilitation rehabilitation of the lift station at the Laguna Shores
Treatment Plant, that pumps sewage from Laguna Shores to Laguna
Madre, was deleted from the Laguna Madre Expansion project when
it appeared funding for the project would be a problem. It is
recommended that this project be reestablished. The Laguna
Shores Treatment Plant will be converted to a pumping station
with the addition of two submersible pumps. The station will
pump 1,5 million gallons per day to the Laguna Madre (Flour Bluff)
Plant eliminating the need to treat at two Flour Bluff locations.
Estimated Cost ................. $ 100,000
5. Kingswood Subdivision, Unit 1 - Lines will be laid along Easy
Street to serve existing homes. This subdivision has all other
Platting requirements including curbs and gutters installed. The
installation of sewer lines will bring subdivision to standards.
Estimated Cost ................. $ 52,000
6. Padre Island Subdivision Units 1 & 2 - This area is between Padre
Island Drive and Pakery Channel and between Park Road 53 and
County Park. -There have been numerous requests by residents of
the area for sewer service. Currently, there are 31 developed
lots in the service area with an additional 154 undeveloped lots.
The area is now in the City Limits. Extension of sewer in this
area would serve these developed lots, plus it will stimulate
development, as it will also make service available to undeveloped
but platted lots. Estimated Cost ................. $ 275,000
$1,457,000
Wastewater System
&age No. 10
C. OSO SYSTEM PROJECTS
•
Many of the collection problems associated with the Oso system were
addressed in the 1982, 1977 and preceeding bond programs and are now
either completed or nearing completion. Two concrete sewers, a 48"
and a 42" in this system have not been sliplined and are showing signs
of deterioration. An engineering and design project is proposed under
Planning Projects in this report.
Nottarb Place Subdivision - This area is off of Weber Road on the
other side of Saratoga. The entire subdivision is developed and
has additional land adjacent, available for development. The
City is currently working with a developer for joint participation
in the construction of a lift station which will serve the
master plan tributary area. The older sections of Nottarb Sub-
division do not have a collection system. When the newer sections
of Nottarb were constructed, a lift station sized to handle flows
from the older sections was built. A collection system to service
the older area is proposed, since it is now inside the City Limits.
Estimated Cost ..................$450,000
Lakeview Acres Subdivision - Growth in this area, located near the
northwest corner of the intersection of Holly Road and Rodd Field
Road, has resulted in citizen requests for service. Sanitary
sewers have been laid in the old Lakeview Acres Subdivision on a
piecemeal basis. It is proposed to provide service to all of the
remaining unserved lots in the subdivision.
Estimated Cost ..................$ 80,000
3. Horne Road Sanitary Sewer
An existing sanitary sewer line varying in size from 36" down to
24" exists in a portion of Carroll Lane, Houston Street, Kostoryz
and Horne Road. This line, because of the numerous cave -ins
upstream, has a number of restrictions in it; therefore, is not
running to design capacity. These restrictions are in the form of
slude buildup which has accumulated over the years. The line
may eventually need to be replaced, but it is recommended that it
be cleaned in order that the flow be accelerated, thus reducing
line surcharge upstream particularly around the McArthur Street
Area and making it possible to better monitor its structural
condition (through the use of TV cameras) and hydraulic capacity.
Estimated Cost ................. $ 200,000
BROADWAY COLLECTION SYSTEM $ 730,000
The Broadway collection system is the oldest in the City. Since most
of the system was laid in streets using clay pipe, the system is
generally in good shape and gives fewer maintenance problems. The
major problems were in areas where ground water infiltrated through the
joints. Many of these sections have been replaced with clay pipe with
a superior joint material to minimize infiltration. Wastewater personnel
have televised much of the downtown area and have repaired pipes at
several locations to prevent ground -water infiltration and sewage
exfiltration into the storm sewer system. This program appears to have
substantially reduced the downtown odor problem.
Wastewater System
Page No. 11
0
The construction of the multi -story office buildings and hotels along
Shoreline will place a heavy load on the Water Street trunk. Fortu-
nately, the peak loads from the Convention Center area, the hotels, anc
the office buildings will generally occur at different times of the
day which will allow the line to handle a larger volume than might be
expected from a line of this size. One project of importance, however,
is as follows.
1. Re lace Corpus Christi Beach Force Main and Rehabilitate Lift
Station - This lift station is located on Canal Street near the
Harbor Bridge and pumps sewage from Corpus Christi Beach to the
Broadway Plant. It is subject to flooding which makes the exist-
ing pump set -up inoperable. The force main from Corpus Christi
Beach also ties into the Water Street trunk. This force main from
the ship channel to the Water Street trunk has become a high mainten-
ance line with frequent blowouts. It is proposed to replace this
line from the channel to the Broadway Plant. This will eliminate
Beach flows from the Water Street main to increase its capacity for
the downtown area and make this growth independent of any other
collection system. Estimated Cost ................. 350,000
$ 350,001
E. ALLISON COLLECTION SYSTEM
There are still some populated areas within this collection system area
near existing trunk lines, but have no sewers. It is proposed to
provide service to the Fallins Riverside and McGee Tract area. The
remainder of the San Carlos area not served is proposed to be financed
through the Community Development Block Grant Program. The major
problems in this system are related to the erosion occurring in both
the Hilltop Creek and Turkey Creek storm drainage ditches. Major
sanitary trunks were laid adjacent and parallel to the bottom of these
natural drainage channels. Bank erosion has exposed these lines and
in many places storm flows wash out the lines when heavy rains occur.
This allows raw sewage to enter the Nueces River and causes heavy in-
filtration flows into the Allison Treatment Plant. Since these creeks
are primarily storm drainage outfalls, erosion control should be
financed from the Storm Sewer Bond Fund and no projects for stopping
the erosion are proposed from the Sanitary Sewer Bond Fund.
1. Fallins Riverside & Magee Tract - This area includes Loma Alta,
Rehfeld and Magee Lane. The existing homes are now served by
septic tanks. This area has a hilly topography and will require
extensive study to determine the most economical design layout.
Estimated Cost ................. $ 350.000
$ 350,000
Wastewater System
•Page Pao. 12
F. WESTSID_ E SYSTEM
The Westside collection system has all been constructed since 1960.
The major trunk serving the Westside Plant consists of a series of
concrete mains varying in diameter from 60" to 42 ". No significant
deterioration has been noted. Portions of the line will be televised
during this calendar year and, if problems are noted, sliplining
projects will be recommended (portions referred to as the Greenwood
Trunk Line). There are no k rown major deficiencies in this system
and no large populated areas not now being served. No additional
projects are proposed for this area.
-0-
TOTAL..
.... ............................... $3,267,000
This program requires that $3,267,000 be reallocated from the Flour Bluff Plant to
these individual projects. Because these projects did not receive priority over
the 1982 Bond Projects, it is logical that implementation should follow the approved
bonds. For this reason only, I would recommend that all projects follow the 1982
Bond Projects in terms of collection only with the exception of the Planning Section
which should be moved ahead now. It is recommended that the program be approved
and the funds transferred as required to establish the individual projects. The
following breakdown shows the source of funds for these additional projects.
Bonds Voted for Flour Bluff Plant $5,950,000
Local Share (EPA partially funded) 1,142,754
Balance 4,807,246
Proposed CIP Projects 3,267,000
Balance $1,540,246
The balance indicated would be used as the local share for the Allison
Wastewater Treatment Plant.
C� 1Q�Ut
Edward A. Partin
*v
i
\,rlK f Gi /rRf
-
II.
Vi
r
LAGUNA VISTA SHORES I
LEGEND
—' — E'xis�in9 ro �� -�-
AND 11OLIDAY HARBOR 211
♦c - .-
- -- I ;,e
EAYSIDE ACRES
ea,aw,
3 �
CA�� B ErreF* asncnd) a-
BLUEWATER u
K I IJC l!001) 6 < >ar
�� _. % � ��
i
�. Slo
Ls
r E�'�E�1j��go •� I 1 •• •'µ 6 va"cM`a
i
� \ • TT RgRY ~.�
e^rTlRVb
c�C
pPpR
ISL,
OG
-O
be
/
�Y>d anAFo.ce Ina;a ro
b
` y
i
JOTTAP3 PLACE g
�19L } 1
Hew L; FeSratan
r�u
C'rf Oe�e %per Parnc.oa�,bn
IF
i_j
LN
\X MON
ENEM,
7, f�, i I I "o
i I� I .j
| _
CORPUS CHRISTI BEACH,
FORCE MAIN
-
c
71
_ 45.16
+.41> \\\
N � -
FALLINS RIVERSIDE AND
4.
GEE TRACTS.
. SEP 1 91984 j
r MIGROFALMEfY