r - part - usaid

three well sites in ane day. 3n the Central Range, however, the
truck is assumed to be able to make only one delivery each day
an average, and the driver and assistant are paid per diems.
Actual WDA wage rates for the pump operator and assistant
are asswed, rather than the higher rates paid to Preject staff.
This apparent inconsistency reflects the nature af the work
involved fn pump operation. Though technically employees sf
WDA, these staff are usually from the local cormnunity. Their
duties are carried out in consultation with the community, and
their positions are as much social as cfficial.
4-2.3. Routine Maintenance
For a diesel-driven pun?, the operations and maintenance
manual prescribes levels of routine maintenance to be carried
out after every 250 as,d 1,000 houks of operation, Certain of
t.ese duties can be undertaken by trained pump operators. In
the dry season, 250 hours represents one month of operation, but
it is realistically assuned that WDA does not at present have
the resources necessary to visit each site each month far eight
months of the year. An average year of operation computes to a
total of 1,920 hours, Allowing for emergency visits in the case
of breakdown, an average of four visits to each site during the
course of the year is assumed for a diesel pump, Two visits
each year are reqiired for routine maintenance of a
hand-operated punp.
A two-man maintenance crew travelling in a light truck are
csnsidered capable of carryinq out this work. With the payment
of per diems, they are assumed to be able to service three sites
ir the Bay Region each day, and one site each day in the Central
Range.
The annual cost of spare parts required for routine
maintenance and emergency repairs is estimated to be 1% of the
ariginai cost of the complete pump assercbly. For a pup
equipped with a diesel engine, the figure of $152 approximately
represents the relacesent of fuel, air, and oil filters, and an
oil change, four times ezch year. Given the sandy conditions at
mast sites, this frequency is reccmended.
4-2-4. Major Overhaul
A major overhaul of the borehole, pump, and where
applicable, diesel engine, is considered to be necessary every
three years. A fully equipped pump crew is required to conduct
this work which invoives xeaoval of the pump from the borehole,
As discussed elsewhere in this report, considerable potential
exists for the rehabilitation of wells by the removal of
encrustation on the screen and casing. Fox this work the drill