QA_-_19GY2018R0004.pdf

19GY2018R0004

CONSTRUCTION OF ONE WELL

QUESTIONS & ANSWERS

What will be the start date of execution of work?

As stated in Section A (page 4) of the solicitation, “the Contractor shall begin performance within 90 calendar days”.

Is there a drawing with dimensions of the work area available for the setup of equipment?

See pages 59 – 67 of WATER WELL Design

In case of water loss in the borehole during drilling: Will our employees be granted immediate access to the work site 24/7?

As per the solicitation, “Working Hours - All work shall be performed during the hours of 7:30am -4pm Monday-Friday Other hours, if requested by the Contractor, may be approved by the Contracting Officer's Representative (COR). The Contractor shall give 24 hours in advance to COR who will consider any deviation from the hours identified above. Changes in work hours, initiated by the Contractor, will not be a cause for a price increase.”

In some stages of the drilling process it isn't possible to stop. Will we be allowed to work for 24hrs a day and or on holidays or Sundays when such a situation occur?

As per the solicitation, “Working Hours - All work shall be performed during the hours of 7:30am -4pm Monday-Friday Other hours, if requested by the Contractor, may be approved by the Contracting Officer's Representative (COR). The Contractor shall give 24 hours in advance to COR who will consider any deviation from the hours identified above. Changes in work hours, initiated by the Contractor, will not be a cause for a price increase.”

Is there a potable water connection available with a capacity of at least 20 m³/h within a distance of 50 meter of the borehole location?

There is a Water Supply line reserved for contracting purposes. As it is in throughout the City, water supply is Gravity-flown. The successful Contractor will need to supply a pump to boast the water pressure to whatever their desire is or as stipulated by Specifications. The water supply point is within that range.

Is there electrical power available 380/400V / 100A?

The power supply for the Old Well is still in existence and is operable. The Power will be provided.

What is the maximum height for trucks to enter the site?

Approximately 4.8m

Should clay layers between all aquifers be sealed with clay sealing pellets to prevent short circuiting of the different aquifers?

Bentonite chip seal Grout is specified – See Proposed Well Drawing in the solicitation (Pages:

59-61)

Should there be placed a piezometer in every aquifer to monitor if there is no short circuit between the different aquifers after backfilling the borehole?

This is a requirement only for the main Aquifer so that the Client will know when maintenance is necessary. All other Aquifers will be monitored as is the responsibility of the Water authority.

However after reviewing the BREAKDOWN OF PRICE on attached schedule the following items were not clear.

Bill 2 No. 5.0

5.0 Drilling and reaming borehole for installation of 200 mm Ø Fiber glass (or PVC if so specified by the client) well casing, stainless steel well screens, observation well and blank (sump/ bull nose).

NB: Ignore the figure “3,000,000”

Bill 3 No. 2.0 & 5.0

2.0 Supply 200 mm Ø Fiber glass well casing confirming to the API Standard Specification manufactured with a threaded joint using a V thread on a thread pattern of 4 threads per inch on a 4 degree taper using 3 inches of threads.

5.0 Supply and install Gravel Pack according to ANSI/AWWA A100-97 Standard. Gravel Pack to have average specific gravity of 2.5 and 1.0 percent or less by weight should have specific gravity of 2.25 and below. Gravel Pack to be thoroughly washed before being placed in the well and shall be free of any foreign material that will compromise water quality.

Bill 4 No. 10.0, 15.0, 15.1 & 16.0

10.0 Supply materials, labour, equipment and tools for the supply and installation of POLYVINYL CHLORIDE PIPES (GYS 107: 2002 SDR26 or equivalent) in nominal length of 5.8m with rubber gasket joints. Rate to include for transportation of materials to site, installation of 150mm white/reef sand bedding for pipes, and a compacted 300mm layer of white sand above the pipelines. Pressure testing and dewatering from whatever source where required. All Reinstatements should be done in accordance to specifications. Rate should also cater for hand digging in areas to be identified by the Engineer. Rates should include the temporary breaking, dismantling and reinstatement (to original or better) of all timber bridges, reinforced concrete entrances and any other obstacles. The cover from the top of the pipeline to the surface should be 1.1m. The contractor should make himself familiar with the area in order to cater for the reinstatements since they would NOT be paid as a separate item.

15.0 Supply all tools, materials, labour and equipment for the installation of a submersible well pump and motor, well master, kits, couplings and all fittings as per technical specification. Rate inclusive of cable straps and all fittings.

15.1 48 m3/hr., 140 m head, 100mm diameter Brass Submersible pump operating at a minimum efficiency of 70 % at duty point

16.0 Supply materials, labour, equipment and tools to supply and install POLYVINYL CHLORIDE PIPES (GYS 107: 2002 SDR26 or equivalent) in nominal length of 5.8m with rubber gasket joints. Rate to include for transportation of materials to site, installation of 150mm white/reef sand bedding for pipes, and a compacted 300mm layer of white sand above the pipelines. Pressure testing and dewatering from whatever source where required. All Reins Rates should include the temporary breaking, dismantling and reinstatement (to original or better) of all timber bridges, reinforced concrete entrances and any other obstacles. The cover from the top of the pipeline to the surface should be 1.1m.