(Translated from Portuguese)
MAIN PLAN FOR DRAINAGE AND WASTEWATER TREATMENT IN THE ……
MUNICIPALITY
Technical Proposal and Documents
1. Introduction
2. Study's Object
3. Methodology adopted in the Study
3.1 Global approach
3.2 List of Main Actions
3.3 Description of the Actions to be Taken
3.3.1 Section A - Basic Studies
3.3.2 Section B - General Plan
3.3.3 Section C - Development Plan
4. Technical Staff
4.1 Names of Technical Staff Members
4.2. Organizational Structure of Technical Staff
4.3. Vinculum of Technical Staff Members
5. Study Development Program
5.1. Global Timetable
5.2. Chronogram of Studies
6. Guarantees and Liabilities
7. Company's Experience
8. Administrative Documents
Attachments:
Annex I - Curriculums of Technical Staff Members
Annex II - Company's References
1. INTRODUCTION
"...", being
well aware of the primary needs of the … municipality and
aiming to bring before the relevant authorities a solution to
improve urban infrastructures and the living conditions of its
citizens, hereby submits the present proposal for execution of
a Drainage and Wastewater Treatment Main Plan. "...", is a company integrated in "...",
a ... based group for consultancy services in designing, planning
and executing projects involving urban infrastructures.
Presently, the ... group is the largest Portuguese enterprise
involved in the construction sector, comprising over 40 companies
and intervening in the fields of construction, public works, environment,
urban infrastructure, energy, transport and real estate.
Today the environmental sector has a great deal of weight in the
group's activities, with the involvement of several companies
under the holding "... AMBIENTE". These international
companies are involved in several sectors, such as project development
and in the maintenance of important sanitary infrastructures.
The design and operation of drainage and wastewater treatment
systems is an area where the companies of the group have acquired
large experience, being presently active in several fronts of
the globe, as shown in the attached brochures.
2. A BRIEF DESCRIPTION OF THE PROPOSAL
The proposal has been organized unto the following two sections:
- TECHNICAL PROPOSAL AND DOCUMENTS;
- PRICE PROPOSAL
After describing the study's main object, the methodology to be
adopted and the organizational structure of the technical staff
is introduced, as deemed adequate for the methodological aspects
involved.
Next to the technical staff, we introduce the works program and,
in conclusion, ...' experience with similar studies.
In order to facilitate the understanding the proposal's technical
aspects, ... presents in Annex the curriculums and the personal
statements from the members of the technical staff as well as
a list of the Company's experience.
In this manner, ... intends to submit to your judgement the technical
and scientific capabilities to execute the study on the Drainage
and Wastewater Treatment Main Plan for that municipality, reiterating
its greatest interest in reinforcing the cooperation that has
maintained with the Government in performing studies for basic
sewerage projects.
3. STUDY'S OBJECT
According to the recently publish….., the district has a
population of 52,500 and the following statistics in terms of
urban supply and wastewater drainage:
- URBAN SUPPLY
Population served: …habitants
Rate of service %
Domestic supply per capita l/hab./day
General supply per capita l/hab./day
Days/year of total absence ..
- URBAN WASTEWATER
Population Served …. habitants
Rate of service …%
The main object of the Drainage and Wastewater Treatment Main
Plan is to equip the municipality with a management instrument
which may bring out solutions for drainage, treatment and final
destination of domestic and industrial effluents, capable of defining
and planning priorities, aiming not only to the drawing of the
study or project but also to its execution.
Thus, the Main Plan shall include medium and long term actions
to be taken, considering the extension of wastewater infrastructures,
without losing sight of certain short-term actions, which may
become a priority.
From this perspective, the basic main objects to be considered
in drawing the Main Plan are the following:
- To find technically and economically favorable solutions which,
in the medium term, may equip the municipality with one or more
highly reliable systems of drainage, transport, treatment and
final destination for wastewaters;
- To assure the flexibility of the system's phased development
in order that its long-term objects may be compatible with a well-planned
and controlled financial effort, while allowing permanently high
and rising levels of sanitary and environmental protection.
As referred above, these two objects must be compatible with the
short-term actions, which are:
- To assure the maintenance and control of the situation within
the next few years;
- To allow occasional corrections which, without compromising
global objects, may bring immediate improvement to the quality
of the service offered to the population;
- To chose sub-system projects that may be launched immediately
without risks of eventual outdating, in order to propose such
projects as candidates for any financing, as soon as possible.
In summary, the Main Plan shall be developed taking into account
the following global perspective:
a) To guarantee quality standard effluents, in compliance with
national legislation and European Community guidelines;
b) To guarantee service and safety standards deemed adequate for
the system's dimensions;
c) To optimize and improve profitability of existing infrastructures;
d) To program investments in a viable and coherent manner with
a clear classification of the short-term urgent measures to be
implemented.
3. METHODOLOGY ADOPTED IN THE STUDY
3.1 Global approach
The basic methodology to be adopted in drawing the Main Plan,
was conceived according to the objects laid under the previous
chapter and is expressed in the sequential list of studies to
be made, which, grouped in a coherent manner, are defined in the
different actions to be taken.
The study on the drawing of the Main Plan is divided into three
main Sections:
SECTION A: BASIC STUDY;
SECTION B: GENERAL PLAN;
SECTION C: DEVELOPMENT PLAN.
SECTION A - The Basic Studies, include analysis and research
gear to acquire a deeper knowledge of the present conditions and
their anticipated evolution within the project's scope, in order
to prepare the ground for future decisions concerning the development
of wastewaters drainage systems in the ….. municipality.
SECTION B - The General Plan, shall establish different possible
alternatives and their respective evaluation under technical,
economical, sanitary, environmental and social point of view,
in order to select the most favorable solution for reaching the
intended objects.
SECTION C - The Development Plan, includes an overall description
of the recommended solution and the correspondent development
program and chronogram of related investments.
3.2. LIST OF MAIN ACTIONS
The following is the overall list of main actions to be taken
in drawing the Main Plan:
SECTION A - BASIC STUDIES
A1 - Data Research;
A2 - Area and Scope of the Project;
A3 - Physical Characterization of Project's Area;
A4 - Socio-urbanistic Characterization;
A5 - Analysis of Existing or Planned Infrastructures;
A6 - Population Centers Characterization;
A7 - Industry Survey;
A8 - Evaluation of Project's Discharge Rate;
A9 -Concentration Discharge Points;
A10 - Identification of Potential Collection Facilities. Quality
Objects;
A11 - Effluent Quality Standards;
A12 - Project's Technical Criteria.
SECTION B - GENERAL PLAN
B1 - Identification of Critical Situations;
B2 - General Criteria of System's Conception;
B3 - Proposal of Alternative Solutions;
B4 - Pre-dimensioning of Alternative Solutions;
B5 - Alternative Solutions Cost Estimation;
B6 - Comparison of Alternatives;
B7 - Selection of Recommended Solution.
SECTION C - DEVELOPMENT PLAN
C1 - System's Technical Description;
C2 - System's Physical Phasing;
C3 - Investment Plan;
C4 - Synthesis and Conclusions
3.3. DESCRIPTION OF ACTIONS TO BE TAKEN
3.3.1 SECTION A - BASIC STUDIES
According to this proposal, the methodology for development of
the Main Plan is expressed in a sequence of studies and analysis
which, under SECTION A - BASIC STUDIES, corresponds to the following
main actions:
ACTION A1 - DATA RESEARCH
To ability to reach the objects intended with the drawing of the
Main Plan is largely dependent on the perception of present situations
and conditions. Therefore, special attention shall be given to
the action related to the survey and characterization of the several
aspects of interest to the studies to be performed.
Although the research for basic elements within the several realms
is performed within the ambit of each field involved, data research
shall be previously organized in order to avoid the dispersion
of tasks and to allow joint efforts.
...' information on the region object of the study, reveals some
aspects wherefore some basic elements required to the execution
of the work must be obtained.
Besides the existing studies and projects concerning specifically
the district's present system, ... shall analyze regional and
local studies that may illustrate the present and forecasted situation,
namely the Municipal Main Plan, the City's Urbanization Plan and
other documents available, which are bound to contain information
concerning:
- Urban and Socioeconomic data;
- Demographic data;
- Data related to the use of the land, ( …. Roads, bridges,
railways and other restrictive factors)
- Data related to quality of water in the collection facilities.
Besides these elements, it will be necessary to obtain topographic
charts at different scales, according to the type of study they
are destined to.
Concerning this aspect, notwithstanding occasional analysis in
detail and in loco surveys, which may require another scale, the
working and presentation scales shall be 1/25000 and 1/10000.
ACTION A2 -AREA AND SCOPE OF THE PROJECT
The area of the project shall correspond, at least, to the administrative
area of the municipality. If, in agreement with the representatives
of the municipality, and due to the progress in the studies, the
possible use of the areas and basins outside the limits of the
municipality would be considered of interest under a technical
viewpoint, such possibility shall be expressly brought up and
characterized.
ACTION A3 - PHYSICAL CHARACTERIZATION OF PROJECT'S AREA
This action shall consist in the analysis of the main characteristics
of the project's area.
In such context, a schematized treatment of the information shall
be carried out, concerning:
- Orography, hydrography, winds, hydrology and hydrogeology;
- Areas under legal restriction;
- Areas to be preserved (especially those of ecological or scenic
sensibility).
The elements to be included in the study are to be submitted in
the form of graphics, tables and drawings (localization, administrative
division, hypsometric and hydrographic drawings) which may clearly
illustrate the existing conditions.
ACTION A4 - SOCIO-URBANISTIC CHARACTERIZATION
Socio-urbanistic characterization will take into account the present
situation and the perspectives for future expansion based on the
analysis of existing documents (Municipal Main Plan, Urbanization
Plan) and any public or private projects and intentions of investment
that may be held by the municipality.
ACTION A5 - ANALYSIS OF EXISTING OR PLANNED INFRASTRUCTURES
This action includes the analysis, not only of infrastructures
associated with the existing or planned wastewater drainage systems
(areas served, collection, outfalls, level raising, treatment
and final destination facilities) as well as the water supply
systems, medium and high voltage power supply infrastructures
and the municipality's road system.
Under these conditions, although the existing drainage systems
may, for obvious reasons, be object of particular attention in
order to define its different components, the written and drawn
elements necessary to illustrate in an organized and synthesized
form the level of service in areas as the existing or projected
water supply, high voltage lines and road (road and train) systems,
shall also be prepared.
ACTION A6 - POPULATION CENTERS CHARACTERIZATION
The expected population growth and its distribution within the
municipality shall be based upon a retrospective analysis and
the elements included in the urban studies examined in the ambit
of ACTION A4.
This action shall give special importance to floating population,
which is significant in certain areas of the municipality, especially
seaside areas.
ACTION 7 - INDUSTRY SURVEY
Industry surveys shall be performed in pursuance of the following
objectives:
- To reveal and characterize the typology of the industries operating
in the area covered by the project;
- To perform a brief study on the existing typologies in respect
of their respective liquid effluents;
- Select the type of units with industrial effluents that may
be accepted to the municipal systems, with or without previous
treatment, and define the respective conditions for acceptance.
- To estimate discharge and pollution loads from the industrial
effluents selected to be admitted to the municipal systems and
their probable evolution.
**
A basic questionnaire form shall be created for the survey and
a schedule with prior visitation arrangement provided for visitation
to the most relevant industries.
The industries selected in this manner shall be marked in the
drawings and grouped in function of their main business, in order
to emphasize the groups with greater significance.
For businesses of greater relevance, the main characteristics
of the respective industrial effluents shall be pointed out in
order to allow the evaluation of the correspondent discharge and
pollution loads and the relevant conditions for admittance to
the municipal systems.
If the data obtained in these surveys is found insufficient, the
values recommended in the bibliography of the field shall be adopted.
ACTION A8 - EVALUATION OF THE PROJECTS DISCHARGE RATE
Based on conclusions from the previous two actions concerning
population centers (A6) and industry survey (A7), the project's
wastewater discharge shall be drawn, taking into consideration:
- the adequate fixation of per capita figures;
- the definition of the system's influx factor;
- the adequate peak factor criteria;
- the definition of adequate criteria for establishing infiltration
levels;
- the definition of the part contributed by industries in the
industry study already referred to.
ACTION A9 - CONCENTRATION DISCHARGE POINTS
This action consists of marking up in the drawings, the partial
basins and sub-basins and the respective discharge concentration
points.
Besides being the base for establishing the system's first "architecture"
(connecting gravitively several concentration points and/or suggesting
the implementation at such points of level raising facilities
or treatment units), this action shall reveal potential collection
facilities to be use as final destination for the treated effluents.
ACTION 10 - IDENTIFICATION OF POTENTIAL COLLECTION FACILITIES.
QUALITY OBJECTS
In this action a qualitative characterization shall be made and
the actual and potential usage of collection facilities determined.
The objects of the Main Plan include improvement in the quality
of the collection facilities, compatible with its present and
potential use, whereof the improvement in quality is a result
of maintaining or implementing the conditions which may allow
an ecological balance fit for the means in question.
Besides the analysis on water lines situations, the matters related
to underground waters and open ground effluents shall also be
approached in the ambit of the present action.
ACTION A11 - EFFLUENT QUALITY STANDARDS
In function of the quality standards expected for collection facilities,
the quality standards for the effluents treated shall be established
for each case, in light of relevant national legislation concerning
the evolution of required wastewater parameters, before being
discharged into the collection facilities, as well as any recommendation
available on the subject.
ACTION A12 - PROJECT'S TECHNICAL CRITERIA
This action shall establish the project's technical criteria,
and shall approve …..'s representatives, who shall preside
over the decision on the technical solutions to be established
under the subsequent phase of the Main Plan.
In this ambit, the following aspects are to be defined:
DRAINAGE AND TRANSPORT WORKS:
- Minimum diameters to be adopted;
- Slope figures;
- Auto-cleaning criteria;
- Maximum speeds;
- Liquid section;
- Materials;
- Implantation conditions;
- Structural stability;
- Visiting Boxes;
- Inverted siphons;
- Level Raising Facilities (number of start groups, backup equipment,
groups number and types, emergency discharge levels; emergency
power generator);
- "Anti-ariete" protection
- TREATMENT FACILITIES
- Level of liquid effluent treatment (primary, secondary, tertiary)
- Type of treatment (Percolating beds, activated mud, pooling,
compacting systems);
- Gravitative thickness of mud;
- Anaerobic digestion of mud;
- Aerobic digestion of mud;
- Mud dehydration through drainage and drying processes;
- Mechanical mud dehydration through filtering or centrifugation;
3.3.2 SECTION B - GENERAL PLAN
ACTION B1 - IDENTIFICATION OF CRITICAL SITUATIONS
Based on the analysis of present overall conditions performed
in the ambit of SECTION A - BASIC STUDIES, the eventual critical
situations of the system shall be detected, whereof solutions
shall be proposed, which shall assure a swift and prompt response
to each specific problem.
ACTION B2 - GENERAL CRITERIA OF SYSTEM'S CONCEPTION
The several alternative solutions for a wastewaters system shall
be studied and compared under the technical, economical, sanitary,
environmental, and social aspects.
In order to outline the technical side of the alternatives to
be considered, aiming to confine them to a number passive to be
analyzed with necessary precision, it is important to establish
some guidelines of the principles to be considered in the Main
Plan, which in due time shall be object of analysis and discussion
together with ….
The main limitations to consider shall be pointed out and expressed
when taking into account the options for conception of alternatives,
giving particular relevance to the critical situations analyzed.
The minimum main limitations to consider are:
- To turn the existing wastewater drainage infrastructures profitable;
- Elimination of critical aspects;
- Alternative routes of transport;
- Alternative location for treatment units;
- Other existing infrastructures: roads, bridges, train tracks.
ACTION B3 - PROPOSAL OF ALTERNATIVE SOLUTION
This action shall propose viable alternatives for transport/interception,
treatment and final destination of liquid effluents and mud.
This action shall evaluate the possibility for use or elimination
of level raising facilities at the discharge concentration points,
resorting, as much as possible, to solution featuring gravitative
drainage.
As far as the treatment is concerned, this action shall consider
the type of treatment adequate to the dimension of the respective
units and the characteristics of the flow and effluents treated.
ACTION B4 - PRE-DIMENSIONING OF ALTERNATIVE SOLUTIONS
Once the global conception for each alternative solution is established,
the pre-dimensioning of the infrastructures that will compose
the system shall follow.
Once it has been accepted that certain alternative grants the
required standards under the technical, sanitary and environmental
perspective, such solution is considered in condition to proceed
to cost evaluation.
ACTION B5 - COST ESTIMATION ON ALTERNATIVE SOLUTIONS
The unitary cost, which shall be the base to evaluate works cost,
is based on information from similar works recently executed and
on ...' experience in this field.
The most important unitary costs shall be presented to and discussed
with the Povoa do Varzim City Hall.
For each alternative, investment cost shall be computed according
to each type of work, estimating the expected average operating
life span for each infrastructure in order to consider the investment
necessary for its replacement.
The evaluation of the investments shall be based upon the unitary
costs and upon the main characteristics of the works, resulting
from the performed pre-dimensioning.
Costs designated as operational costs shall include charges with
the several actions that may be necessary during the life span
of the works, namely:
- Costs with personnel;
- Costs with energy;
- Costs with reagents (in the case of treatment facilities);
- Costs with fuel and replaceable items;
ACTION B6 - COMPARISON OF ALTERNATIVES
The several alternatives shall be compared under this action.
Taking into account the investment and operational costs for each
alternative, it is possible to establish a hierarchy of alternatives
based on techno-economic criteria.
Since the alternatives being compared have to comply with the
required technical, sanitary and environmental standards, the
correspondent investments have already taken into account the
incidence of that aspect, which is thus included in the techno-economical
comparison. Still, there shall be a qualitative evaluation of
the system's vulnerability in function of the respective capacity
to respond to emergency situations (number of level raising facilities,
number of ETARs).
ACTION B7 - SELECTING THE RECOMMENDED SOLUTION
The above presented multi criterial analysis shall eventual lead
to a couple of alternatives considered to have greater interest.
These shall be subject to deeper comparison in consideration of
financial factors, with updated costs, in order to reach the most
favorable solution.
Particular attention shall be given to the flexibility of the
solution chosen, in order to examine the degree of adaptability
and adjustments that may be of interest in later phases, due to
slightly different evolution from what may have been expected
in the beginning.
3.3.3 SECTION C - DEVELOPMENT PROGRAM
ACTION C1 - SYSTEM'S TECHNICAL DESCRIPTION
This action shall involve the projected system's global characterization,
and is materialized by the written pieces and drawings that may
give an overall presentation of the works.
This presentation shall include the main characteristics of the
works dimension and that of the equipment related to the several
components in the system.
This action shall establish short term measures to be implemented,
taking into account the following objects:
- To assure that the situation will be under control during the
next few years;
- To promote corrections (improvements, expansions) that, without
compromising on the final system solution, may allow immediate
improvement in the system's performance;
- To point out or to establish priorities in launching initiatives
whereof, without the risk of future outdating, a favorable position
may be reached in terms of financial usage opportunities.
ACTION C2 - SYSTEM'S PHYSICAL PHASING
Besides works that are considered urgent, to be revealed in the
ambit of the action referred to under ACTION C1, priorities shall
be established for the implementation of infrastructures, leading
to alternative proposals for physical phasing of the works.
This action consists of establishing a program for a phased execution
of the works, assuring a harmonious sequential development of
the projected works.
Factors of functional dependency and technical, economic and environmental
character shall be considered with the phasing to be proposed.
Towards that, the execution of works through functional sections
shall be proposed, in order to establish complete drainage, treatment
and final destination sub-systems.
ACTION C3 - INVESTMENT PLAN
Once the system's physical phasing and its relevant plan of action
is established, the elaboration of the respective investment plan
shall follow, taking into account the following aspects:
- to serve high sanitary risk population;
- to give priority to areas with lower per capita cost (in principle
densely populated areas);
- to place investment efforts within the next few years to benefit
from any community funds.
ACTION C4 - SYNTHESES AND CONCLUSIONS
The relevant aspects of the Main Plan shall be synthesized and
systematized with this action, namely concerning the present situation,
needs and availability expected, the adopted main criteria, the
final solution accepted for the future system and the correspondent
development the investment plan.
These elements shall be organized in such a way as to allow the
reader to obtain a much precise general idea of the approved Main
Plan.
4 - TECHNICAL STAFF
4.1. - NAMES OF TECHNICAL STAFF MEMBERS
The efficiency of the actions to be taken in the process of reaching
the objects aimed by the study proposed under the present proposal,
calls for the use of expertise and multi disciplinary staff, endowed
with technical and scientific capabilities in several fundamental
subjects.
Thus, ... proposes to mobilize a team of technicians whose functions
and skill are listed hereunder:
4.2 - Organizational Structure of Technical Staff
The organizational structure of technical staff, illustrated in
the flow chart presented in the next page, considers eight areas
of expertise with direct connection to the studies to be carried
out:
- Hydraulic Engineering;
- Water/environmental quality;
- Sanitary Engineering;
- Electromechanical equipment;
- Structures;
- Geology/ geotectonic;
- Architecture;
- Economic Studies.
Each of these fields shall be headed by an expert in the field
(name in brackets), who, besides participating actively in the
drawing of the study, shall assure the articulation of the respective
field with the Head of the Project.
The teams in each field of expertise shall be kept through all
the phases of the work to assure continuity and consistency to
the study.
The supporting sectors (topography, drawing, measurements and
budget, computation, text processing and reprography ), although
under the general coordination of the Head of the Project, shall
work in direct communication with the diverse fields of expertise
in order to assure that the several actions are executed on time.
Leadership functions (Head of Project and Head of Expertise) were
established upon the principle whereby its members shall have
an active technical participation in the fundamental areas of
the study.
PROJECT'S COORDINATION
… shall be in charge of the contractual relations with the
….
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