The rates for various items of works given in this unified schedule of rates
are based on average rates for whole of the Madhya Pradesh State. The market
rates may vary from place to place in the state depending upon the geological
formation and other local conditions. No contract should, therefore be awarded
directly at the rates given in this unified schedule of rates without inviting
proper tenders.
Tube wells drilled
should be perfectly vertical. The rates for drilling are inclusive of the
verticality test required to be conducted.
The rates for
drilling provided in the Unified Schedule of Rates are inclusive of depreciation
charges of all the machinery, tools & plants required for drilling operation,
transportation of drilling machine, erection of machine at site, removal of
machine from site after completion, cost of water, cost of drilling mud, fuel,
labour and all other unforeseen items for drilling work and clearance of site
after completion of work.
For locating
the proper site for tube well construction with in the selected habitation
if resistivity survey is required then the resistivity survey shall be carried
out by a well qualified and experienced geohydrologist using his own suitable
resistivity meter.
The ordinary
tube wells shall be constructed in rocky formation uncovered or covered by
overburden using suitable drilling machine depending upon the site conditions
and time period allowed to complete the work.
In the ordinary
tube wells the casing pipe of specified diameter shall be lowered up to a
minimum depth of 9 meters below ground level. If the collapsible strata in
overburden continue beyond 9 meters depth then the casing pipe shall be lowered
up to rock level and embedded in rock for a depth of 0.15 meter. The casing
pipe shall also be extended above ground level for a height of about 0.3 meter.
The diameter
of ordinary tube wells constructed for installation of hand pumps shall be
125 mm up to bottom level of the casing pipe and 115 mm in the rock below
the casing. Such tube wells shall be designated as 125/115 mm dia ordinary
tube well.
The ordinary
tube well constructed for installation of hand pump in the basaltic rock area
where intertrappean formation (collapsible strata between the rocks) is present.
The nominal diameter of the tube well up to the level of intertrappean formation
shall be 150 mm. The intertrappean formation shall be encased by 125 mm dia
G.I. casing pipe. Therefore, the finished nominal diameter of tube well in
the intertrappean formation shall be 125 mm but in the rock below the intertrappean
formation, the nominal diameter of tube well shall be 115 mm. Such tube wells
shall be designated as 150/125/115 mm dia ordinary tube well.
The nominal
diameter of ordinary tube well constructed for installation of power pumps
shall be 150 mm or 200 mm for the entire depth depending upon the size of
pump to be installed in the tube well. Such tube wells shall be designated
as 150 mm dia ordinary tube well & 200 mm dia ordinary tube well.
The gravel
packed tube well shall be constructed in alluvial formation in which the fine
and uniform sand is present in the water bearing aquifer. Such tube wells
shall be constructed by direct circulation rotary drilling method or reverse
circulation rotary drilling method using suitable rotary drilling machine.
The diameters
of boreholes for construction of 100 mm, 150 mm & 200 mm finished nominal
dia meter gravel packed tube wells shall be 300 mm, 350 mm and 400 mm respectively.
Such tube wells shall be designated as 300(100) mm dia, 350 (150) mm dia,
400 (200) mm dia gravel packed tube wells.
The gravel
packed tube wells should be constructed only after obtaining the technical
clearance of drawing & design of gravel packed tube well from Chief Engineer
in charge of the Zone.
The rates for
drilling work are inclusive of the collection of samples of soil/rock cuttings
not less than 100 grams from different strata to be collected at every 3 meter
depth for initial 15 meter depth and at each 10 meter depth after 15 meter
and at the change of strata and depositing same with the Engineer in charge
duly marked and packed in polythene bags.
The rates are
inclusive of the preparation and submission of strata chart of the tube well
constructed in the prescribed proforma.
It shall be
the responsibility of the contractor to collect the water sample from completed
tube well and send it to departmental laboratory for chemical and bacteriological
analysis. The water sample for chemical analysis shall be collected in 2 litres
plastic bottle and samples for bacteriological analysis shall be collected
in 300 ml sterilized bottle as per the direction of Engineer in charge
All risks of
accidents and Jamming and braking of drilling tools etc. will be contractor's
liability. No extra charges will be payable to the contractor on this account.
Contractor
shall also make arrangements of first aid facilities for any accident. All
care and precautions should be taken and it should be ensured that there are
no accidents while drilling the borehole. Proper dress and equipments like
gumboots, helmets and tentage etc. shall be provided by the contractor to
the workmen at site.
During any
operation carried out for construction of tube well, if any tool, pipe etc.
fall down in the tube well then the contractor shall carry out the necessary
fishing operation at his own cost. The contractor shall use his own equipment
for such operation. If the tube well becomes useless due to any fallen article,
it shall be treated as abandoned tube well and no payment shall be made for
such abandoned tube well.
The Lowering
and fixing of casing pipe in ordinary tube well and lowering of casing assembly
in the gravel packed tube wells shall be done in the presence of authorised
representative of the Engineer in charge of work. The G.I. casing pipe to
be lowered and fixed in intertrappean formation shall be jointed by welding
only. In the case of gravel packed tube well it shall be ensured by the contractor
that the slotted pipes or screened pipes are lowered in the tube well at the
locations of water bearing aquifers as per design. The contractor shall also
ensure that joints of the pipes in casing assembly are rigid and water tight
and a bail plug is properly fixed in the bottom of casing assembly.
All the gravel
to be used, as pack in gravel packed tube wells shall be as specified in IS
4097: 1988 (Reaffirmed - 1993).
The development of completed tube well shall be carried out with the help
of suitable capacity submersible pumping set as per the directions of engineer
in charge to make the tube well free from silt, sand and other foreign material.
The discharge from tube well during its development shall also be measured
by 'V' notch for approximation of yield The rates for the item of development
given in this unified schedule of rates includes for all such arrangement.
The yield test
of tube well shall be conducted by suitable capacity single phase or three
phase submersible pumping set to be operated by generator set or by taking
temporary electric connection at site. It shall be the responsibility of the
contractor to arrange for suitable capacity submersible set, generator set,
suitable measuring equipments for measuring the discharge and draw down of
the tube well. The rates for item of yield test given in this unified schedule
of rates includes for all such arrangements.
It shall be
compulsory for the contractor to carry out the yield test of each and every
tube well using suitable submersible pumping set for a minimum time period
of 9 hours as per the direction of Engineer in charge. The work of construction
of tube well shall not be treated as completed unless the proper yield test
of tube well is conducted. The condition of 9 hours testing shall not be applicable
for the tube wells, which do not have sufficient water to run the test for
9 hours.
The tube well
shall be disinfected after completion of yield test using bleaching powder
solution as per the direction of Engineer in charge, at the cost of the contractor.
The installation
of hand pump over the tube well shall be carried out as per the direction
given in the installation manual of Unicef. All the exterior parts of pump
coming in contact with the water shall be thoroughly cleaned and dusted with
bleaching powder. The hand pump after installation should be tested for its
proper installation by operating it continuously at least for one hour and
measuring the rate of discharge from hand pump. The rates for the item of
installation of hand pump given in this unified schedule of rates includes
for such arrangements.
For construction
of R.C.C. platform and drain for the hand pump, the contractor shall use only
steel plate frame shuttering designed as per the dimensional requirement of
platform and drain.
No payment
what so ever shall be made for the tube wells left incomplete by the contractor
or for the tube wells, which are not vertical, and also for such tube well
which are rejected by the department.
All contracts
based on this unified schedule of rates shall be governed by the directions
and other notes and conditions given in this unified schedule of rates, in
addition to all the other conditions of the agreement. As the rates in this
unified schedule of rates are linked to these conditions and directions, it
shall not be necessary to attach the copies of these conditions to the contract
agreement.
In the interpretation
of description of items or rates of this unified schedule of rates and specifications,
the decision of the Engineer-In-Chief shall be final.
The issue rates
of casing pipes, hand pumps and other material given in Annexure-1 of this
unified schedule rates are only for the purpose of preparing realistic estimates.
These rates are not for making purchases or for entering into any contracts.
The rates for
various items of works given in this unified schedule of rates includes for
1% overhead and 10% contractor's profit. If the work is carried out departmentally
then the rates applicable for departmental works shall be 9.09% less than
the rates of various items given in this unified schedule of rates.
The following
Indian standard may be referred to:-
I.S.2800
(Part-I) :1991 Code of practice for construction & testing of tube
wells/Bore wells.
I.S. 2800(Part-II):
1979 Code of practice for construction & testing of tube wells/Bore
wells (Reaffirmed 1999)
I.S. 4097-1988:
Gravel for use as pack in tube wells Reaffirmed 1993)
