HomeMy WebLinkAbout7 Alder Test Well AtItem #
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Public Utility District
Memorandum
To: Board of Directors
From: Ed Taylor, Water Utility Manager
Date: 2-14-2003
Subject: Change Order#1 Alder Test Well
BACKGROUND:
The Board of Directors at the August 7, 2002 meeting awarded the Alder Test Well Drilling
Project contract to Humboldt Drilling & Pump Co. The contract for the construction of the
Alder Test Well Drilling Project was $130,075.
The test well drilling at the Alder Dr. site required additional work to complete. Four items were
needed: Additional depth,Additional test pumping, Sound walls, Delay. An additional depth of
132 feet was drilled to confirm the geology of the area and to attempt to find water baring strata.
An additional 15 hours of test pumping was conducted to try to develop the water supply of the
test well and to provide better water quality information. The bid specifications for the test well did
not include an item for a sound wall to control the drilling noise. Because of the open location of
the test well site, staff did not anticipate the need for the sound wall. Unfortunately the drilling
sound did carry into a residential area which then necessitated the installation of a sound wall
system. The last item is a delay claim. This was caused by a discrepancy with the Nevada
County Health Department about the need for a permit and the installation time for the sound wall
system.
Staff is now requesting that the Board approve Change Order #1, which completes this
project.
ORIGINAL CONTRACT AMOUNT: $130,075.00
CHANGE ORDER#1 $33,006.00
TOTAL AFTER CHANGE ORDER= $ 163,081.00
RECOMMENDATION:
I recommend that the Board approve Contract Change Order.
Attachment:
0 Page 1
Humboldt Drilling &Pump Co. Change Orders
Preparation CHANGE DEDUCT ADDITIONAL
REQUESTED
1 Mobilization/demobilization to Unit price $12.100.00/lump sum
site of all necessary equipment,
materials, and personnel. Amount $12,100.00
Drilling and Well Completion
2 Drill borehole to approximate 20-ft Unit price $2,000.00/lump sum
depth and install/cement in place
conductor casing to total depth. Amount $2,000.00 �$4o t.00) $40 00
19-inch borehole/ 14-inch casing
3 Drill, log, and sample borehole to Unit price $45.00/ft
approximate 1,000 foot depth_ $8,580.00 $8,580.00
nominal 12-inch hole Amount $45,000.00 Additional 132 ft
4 Furnish & install blank low carbon Unit price $9.00/ft
steel, casing to total depth $1,206.00 $1,206.00
lest 400 ft blank). Amount $3,600.00 Additional 134 ft
nominal 6-inch
5 Furnish & install perforated low Unit price $18.00/ft
carbon steel, pipe to total depth
(600 feet quad-perforated). Amount $10,800.00
nominal 6-inch
6 Furnish and install gravel pack Unit price $10.00/ft
(est 950linear ft). $1,320.00 $1,320.00
Amount $9,500.00 Additional 132 ft
7 Furnish and install cement seal Unit price $20.00/ft
in annular space from 50 ft bgs
to ground surface(linear ft). Amount $1,000.00
Humboldt Drilling & Pump Co.
8 Air-lift well development Unit price $350.00/hr
(estimate 24 hrs) $5,250.00 $5,250.00
Amount $8,400.00 Additional 15 hrs
9 Well development chemicals Unit price $500.00/100lbs
(NW220 or similar approved
dispersant) (100 Ibs) Amount $500.00
Swab/Sampling
10 Dual Swabldevelopment/sampling Unit price $375.00/hr
(estimate 24-hrs) (;sTSL€j 'a -$750.00
Amount $9,000.00 2 hours less
Pump Development and Pumping Test
11 Furnish/install/remove/pump to Unit price $5.200.00/lump sum
400 ft depth.
Amount $5,200.00
12 Conduct pump/surge development Unit price $150.00/hr
(estimate 12 hrs) ($3"') f) -$300.00
Amount $1800.00 2 hours less
13 Conduct constant-discharge test Unit price $150.00/hr
(estimate 24 hrs) (5Op -$900.00
Amount $3,600.00 6 hours less
14 Furnish & install locking cap on Unit price $1,000.00/lump sum
nominal 10-inch casing extending t1C}} -$1,000.00
two feet above ground surface Amount $1,000.00 No Charge
Humboldt Drilling & Pump Co.
Miscellaneous
15 Standby time, drilling rig Unit price $250.00/hr
with crew(max 8 hr/day)
Amount $2,000.00 $10,000.00 $10,000.00
16 Standby time, drilling rig Unit price $150.00/hr
without crew(max 8 hr/day)
Amount $1,200.00
17 Geophysical survey Unit price $3.000.00/lump sum
Approximately 1,000 feet
total logging. Amount $3,000.00
18 Install irrigation pipeline for Unit price $1,000.00/100ft
discharging groundwater produced
during airlift and pumping Amount $5,000.00
development and testing
(est. approcimately 500 feet)
19 Weekly use of pipeline for Unit price $500 100 ft/week
discharging groundwater
produced (est. 2 weeks) Amount $5,000.00
20 65-70 % granulated calcium Unit price $75.00/20ibs
Hypochlorit(est 100 Ibs)
Amount $375.00
Humboldt Drilling & Pump Co.
21 Other items Contractor may Sound Wall -Furnish & Install $10,000 $10,000.00
require.
Total for well construction and
completion including Amount of Bid $130,075.00 $33,006.00
miscellaneous charges
Changes to Contract Items 43,33+3,00 $ „56,00