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Contract Reference Number: None
Name of the Contract: Proposed Exploratory Drilling of One (1) Production Well (Lubogan PW#2) with 200M Depth Pilot Hole
Location of the Contract: Brgy. Bankas Heights, Lubogan, Davao City

 

SUPPLEMENTAL/BID BULLETIN

 

Please find herewith Amendment or Modification on some items in the Bidding Documents.

 
ADDENDUM NO. 1
 

Amendment to paragraph 2 of Section I – Invitation to Bid, specifically the contract duration, Page No. 7, which shall now read as follows:

1. The Davao City Water District now invites bids for the Drilling of 200M depth pilot hole with 250mmØ borehole, 200M depth well utilization with gravel pack and 18m depth cement grout with 1m clay seal for sanitary seals, 600mmØ upper borehole with 400mmØ x 91 linear meters Blank Casing, 400mmØ lower borehole with 250mmØ stainless screen/blank casing combination Rotary Drilling Method. It also includes furnishing of all materials, equipment, tools, labor, transportation including fuel, power and water and any other means necessary to complete all works and located in Barangay Bankas, Lubogan, Davao CityCompletion of the Works is required within the contract duration of 180 Calendar Days. Interested bidders should have completed, within ten (10) years from the date of submission and receipt of bids, a contract similar to the Project. The description of an eligible bidder is contained in the Bidding Documents, particularly, in Section II. Instruction to Bidders.

 

ADDENDUM No. 2

 

Amendment to Section VIII – Bill of Quantities, to breakdown items for Mobilization and Demobilization and to correct the unit under Exploratory Drilling (Preliminary Design), Item I, Page No. 79, which shall now read as follows:

 

WORK ITEM

ESTIMATED TOTAL QUANTITY

UNIT PRICE (including tax) Pesos

PRICE (including tax) Pesos

I.   MOBILIZATION

Lump sum

 

 

II. EXPLORATORY DRILLING (Preliminary 
     Design)

 

 

 

A.

Preparation of site (includes installation of temporary facilities)

Lump sum

 

 

B.

Setting-up & test run of Rig

Lump sum

 

 

C.

Drilling of 250mmø  upper and lower pilot hole including strata sampling every one meter interval

200.00 l.m

 

 

D.

Geophysical Borehole logging of pilot hole

Lump sum

 

 

E.

Reaming of upper and lower pilot hole to
 300mmø Borehole 

200.00 l.m

 

 

F.

Reaming of upper and lower pilot hole to 400mmø Borehole

200.00 l.m

 

 

G.

Reaming of upper pilot hole to 500mmø Borehole (0 – 95m)

95.00 l.m

 

 

H.

Reaming of upper pilot hole to 600mmø Borehole  (0 – 95m)

95.00 l.m

 

 

I.

Furnishing of 400mmø spiral welded steel casing with min. wall thickness of 9 mm including one (1) meter stick-up pipe

91.00 l.m

 

 

J.

Furnishing of 250mmø spiral welded steel casing with min. wall thickness of 9 mm including 5m sump pipe with bottom closure

52.00 l.m

 

 

K.

Furnishing of 250mmø stainless steel continuous slot wedge wirewound screens, slot size 1.5mm, 3m length each section (slot 60)

57.00 l.m

 

 

L.

Furnishing/Fabrication of 400mmø x 250mmø x 1.0m  steel reducer

1.00 pc

 

 

M.

Furnishing and fabrication of casing centralizers

9.00 pcs

 

 

N.

Installation of 400mmø and 250mmØ casing & screen and 400mmØ x  250mmØ Steel Reducer

201.00 l.m

 

 

O.

Furnishing and installation of gravel packing

181.00 l.m

 

 

P.

Development by high velocity water jetting

48.00 hrs

 

 

Q.

Deflocculate Drilling mud with polyphosphate solution

Lump sum

 

 

R.

Development by Surging including bailing out of settlements

48.00 hrs

 

 

S.

Development by Airlifting

24.00 hrs

 

 

T.

Step Drawdown pumping tests with five steps at one hour duration each step carried out in succession with discharge rate increasing in equal fraction of estimated discharge of 100 lps Lump sum    
U.

Continuous constant discharge rate pumping test;

Estimated Q = 100lps
72.00 hrs    
V. Furnishing and installation of Clay Seal 1.00 lm    
W. Cement grouting of annulus around 400mmø casing 18.00 lm    
X. Furnishing and Installation of well head cap, 50mmØ Gravel tube and 38mmØ water level Sounding tube with screw cap and concreting of 1.00m x 1.00m x 0.10m pedestal including painting of one meter stick - up pipe Lump sum    
Y. Clearing and restoration of site Lump sum    
III. DEMOBILIZATION Lump sum    

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TOTAL PRICE (Items No. I-III, including taxes):   __________-
  TOTAL PRICE (in words):        _____________________

      

 ____________________
         Chairman

   Address:   ________________
  Tel. No.:      ________________________--

For guidance and information of all concerned:

MILDRED G. AVILES

Chairman, Bids and Awards Committee - B

 

 
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