1. INITIAL CONSULTATION: we
determine with you whether our system
is suitable to your needs. While initial contact, data and discussions
can be exchanged via email, we may need to review your site and the
infrastructure(s)' location plans in order to understand your site,
evaluate its need and discuss possibilities for the location of the
2. PROJECT EVALUATION, SITE SURVEY AND
PROPOSAL: once you've
confirmed your interest in WWG, we will need data from you in order
to evaluate overall project sewage generation. Depending on the project,
we may need visit your site to review land contours and infrastructures,
sometimes already existing sewage treatment system, conduct percolation
tests of the soil, note existing trees and vegetation, possible drainage
areas and other factors that will affect the proper functioning of
the WWG system.
Payment Calendar N° 1: according to
the dimension of the project and the chosen option, it covers a pre-study
(1a) or a complete study (1b) of the project, with identification
of sewage quantity generated, advice of upgrade when needed of existing
wastewater treatment facilities if the project is already built, dimensioning
of WWG surface with drainage of treated water.
3. ACCEPTANCE OF OUR PROPOSAL: We
send you a document containing the project study, the dimension and
size of necessary installations, schematic plans and necessary informative
documents to obtain permission to build (when necessary).
Final fine-tuning of the system and shape
of the WWG units will be discussed at this time as well as types and
varieties of plants suitable to the project and owner's preferences.
Calendar N° 2: If a pre-study has been chosen, this payment will
cover the full study of the project's wastewater, fine-tuning the
sizing of the necessary treatment with construction lists and complete
budget. This payment also confirms our co. supervision of the construction's
principal steps and a follow-up of one to five years.
4. CONSTRUCTION: We always
work with a local construction company of where the WWG unit/s are
to be implemented and can in some cases be contractors as well. We
only deliver final plans of the WWG systems when we are secured that
we will be co. supervisors of the construction or that we are assured
of the experience and Know-How of the construction supervisor. If
WWG team is not to be involved in the construction, in-person or phone/email
meetings with the contractor are needed to ensure that system engineering
will be properly applied and that each principal step before final
testing and planting will be respected.
If our study includes the installation or upgrade of an existing
primary treatment (septic tank, Imhoff tank, Faecal Bags or similar)
as well as other general installations, these recommendations will
ideally be implemented prior to WWG unit implementation.
Calendar N° 3: According to the size and nature of the project,
this payment can take place in several stages or be partially included
in Payment Calendar Nº 2. Final outcome will be the hand-over of the
WWG system, the WWG license certifying the proper installation of
the constructed wetland/s and drainage, training of the person or
personnel in charge of maintenance and delivery of the Maintenance
* If WWG is also acting as contractor we will decide with Client of
the construction calendar. In the majority of cases, materials, machine
rentals when necessary and labour will be paid directly by the Client
5. INSPECTION: Regardless
of who is supervising construction, the following essential points
will need to be monitored prior to planting:
- AN ADEQUATE PRIMARY TREATMENT, well sized
and built with final filter, ensuring a good separation of solids
- VERIFICATION OF THE TEXTURE AND NATURE
/ GRANULOMETRY OF SOILS: when choosing drainage into the soil,
it is fundamental that a permeability test of the soil be done in
order to ensure proper drainage.
- LINING TESTING, LEVELS AND WATER FLOW:
if WWG units are built in concrete, reinforcements will need to be
inspected when framed, before the cement is poured. If they are waterproofed
via a membrane, the liner will need to be inspected. We must also
ensure that the pipes are well placed and that the water flow between
the system's different components is proper, ensuring correct levels
- WATERPROOFING / LEAK TESTING AND DRAINAGE:
after the lining is placed, we must supervises a water leak test to
ensure proper sealing with no leak/s. When soil drainage is chosen,
drainage network must be properly placed, laid-out and piped (with
testing of equal distribution of water at the end of each line).
- GRAVEL / MEDIA USED IN THE WWG UNIT /S:
before gravel is placed in the unit/s and sometimes in the drainage
lines, we must ensure it's nature (porosity, density), grading (size)
and that it is properly cleansed, without impurities.
6. PLANTING AND MAINTENANCE TRAINING:
at the time of planting, we train the owner/s and/or designated staff
on the procedures to properly operate and maintain the system
and provide a Maintenance Manual.
The final payment will ensure the system's hand-over,
as well as the licensing fee and maintenance manual.