Well 9 Rebid Documents FINAL.pdf

INVITATION TO BID

Well 9 Drilling and Testing

TABLE OF CONTENTS

Call for Bids ............................................................................................................. Section I

Bid Proposal/Price List .......................................................................................... Section II

Instructions to Bidders .......................................................................................... Section III

Specifications ........................................................................................................ Section IV

Bid Bond……………………………………………………………………… .... Section V

Example Small Works Contract............................................................................ Section VI

Exhibits Exhibit A – Well Log for Well 9 Exhibit B – Site Map, Vicinity Map, and Stormwater System Map Exhibit C - City of Oak Harbor Inadvertent Discovery Protocol (IDP) Exhibit D- Special Conditions

• RH2 Technical Specifications

SECTION I

CALL FOR BID

The City of Oak Harbor will receive sealed bids for Well No. 9 Drilling and Testing at the City of Oak Harbor, 865 SE Barrington Drive, Oak Harbor, Washington 98277, up to 2:00 pm (PST) on Tuesday, September 15, 2026.

Contractors are invited to submit bids for the Well 9 Drilling and Testing Project in Oak Harbor, Washington. The work will consist of developing a new emergency groundwater supply at Well

9. The City requires the construction of a new well to replace existing Well 9 on the same parcel.

All bidding and construction are to be performed in compliance with the Contract Provisions and Contract Plans for this project, and any addenda issued thereto that are on file at the office of the City Clerk, City Hall, Oak Harbor, Washington. Construction Cost Estimate is $180,000- $220,000.00.

Full notice and details of the solicitation are available online at https://www.oakharbor.gov/Bids.aspx. There is no charge to register, receive notifications, or view and download the documents. Contact Sandra Place, Administration Manager, via email at splace@oakharbor.org if you are unable to access the documents online.

Contractors who download plans and specifications are advised to email splace@oakharbor.org to be added to the plan holders list to receive any addenda that may be issued.

The Proposals will be publicly opened and read aloud shortly after the time and date stated above. Proposals are to be submitted only on the form provided with the Bid Documents. All Proposals must be accompanied by a certified check, postal money order, cashier’s check, or Proposal bond payable to the "City of Oak Harbor" and in an amount of not less than five percent (5%) of the total Proposal amount.

The Owner reserves the right to reject any or all bids, to waive irregularities or informalities in the bid or in the bidding, to accept any alternate bids, and to make such award that it deems to be in its best interest and pursuant to the terms of the General Conditions. The Owner intends to award a contract to the lowest responsible and responsive bidder.

The City of Oak Harbor in accordance with Title VI of the Civil Rights Act of 1964, (78 Stat.

252, 42 U.S.C. 2000d to 2000d-4) and the Regulations, hereby notifies all bidders that it will affirmatively ensure that in any contract entered into pursuant to this advertisement, disadvantaged business enterprises will be afforded full and fair opportunity to submit bids in response to this invitation and will not be discriminated against on the grounds of race, color, or national origin in consideration for an award.

Julie Nester, City Clerk https://www.oakharbor.gov/Bids.aspx mailto:splace@oakharbor.org mailto:splace@oakharbor.org

Published: Daily Journal of Commerce-August 22, 2026 and August 29, 2026 Whidbey News Times – August 22, 2026 and August 29, 2026 Builders Exchange of Washington, Incorporated

SECTION II

BID PROPOSAL

TO: Oak Harbor City Council Oak Harbor, Washington

Ladies and Gentlemen:

The undersigned hereby certifies that he has read the "Call for Bids", "Instructions to Bidders", "Specifications", and other contract documents pertaining to this bid proposal and that he thoroughly understands and agrees to furnish all labor, materials, supplies, hardware, transportation, disposal, overhead, necessary profit, the equipment and/or services in the time and at the prices set forth below:

The Contractor may complete the Project using either rotary or cable tool drilling methods.

The Contractor shall select which method will be used below by checking the line:

Rotary Drilling Method Cable Tool Drilling Method

BID SCHEDULE

Item Description Quantity Unit Unit Price Amount

1 Mobilization / Demobilization

1 LS NA

2 Install Sanitary Seal 20 LF

3 12-Inch Drilling 230 LF

4 Furnish and Install 12-Inch Diameter Well Casing

202 LF

5 Plumbness and Alignment Testing of 12-Inch Casing

1 LS NA

6 Furnish Well Assembly 1 $ $25,000* $25,000*

7 Assemble and Install Well Screen Assembly

20 Hrs

8 Well Development and Other Authorized Work

30 Hrs

9 Furnish, Install, and Remove Test Pump, Discharge Pipe, and Meters

1 LS NA

10 Pump Test Operation 30 Hrs NA

11 Video Inspection 1 LS NA

12 Standby Time 6 Hrs

13 Minor Change 1 $ $10,000* $10,000*

Subtotal Base Bid (numbers)

Subtotal Base Bid (words)

*Items No. 6 and 13 are Placeholder Amounts

Bid Subtotal______________

9.3% Sales Tax ____________

Bid Total_________________

(Construction Estimate is $180,000 – 220,000)

The Undersigned Bidder acknowledges receipt of the following addendum(s).

Addendum No. ____________ Date ___________

Addendum No._____________ Date ___________

" Well 9 Drilling and Testing”

Bid Due Date: 2:00 p.m. Tuesday, September 15, 2026

Bidder

By (Authorized representative - Please Print)

Signature/Date

Address

Phone

E-mail address ___________________________________________________

SECTION III

INSTRUCTIONS TO BIDDERS

1. Bid due date will be Tuesday, September 15, 2026, at 2:00 p.m. (PST)

2. All bids must be sealed in an envelope and plainly marked on the outside of the envelope, “Bid for Well No. 9 Drilling and Testing.” The envelope shall bear the Bidder’s name and address

3. Washington State sales tax shall be submitted as a separate item.

4. Federal excise tax shall be excluded.

5. NO ESTIMATES WILL BE ACCEPTED.

6. A site visit is highly encouraged but not required. Please e-mail Sandra Place at splace@oakharbor.org to make arrangements.

7. Prevailing wages apply.

8. The City of Oak Harbor reserves the right to consider delivery time, to reject any and/or all bids, to waive any informalities in the bidding and to accept the best and most satisfactory bid.

9. The City reserves the right to waive individual specifications if it is satisfied that the bid otherwise meets the performance standards set by these specifications.

10. No bidder may withdraw his bid for a period of sixty (60) days after the date set for bid opening.

11. Proposals must include the unit process and/or lump sum price bid must be shown in the unit price and total price provided.

12. The proposal signature sheet must be filled in and signed by the bidder.

13. All Addenda must be signed and accompany the proposal.

14. A bid bond, certified check, cashier’s check, or cash in the amount of five percent (5%) of the Total Bid must be included.

15. The Non-Collusion Affidavit and the Anti-Discrimination Affidavit must be signed,certified, and included.

16. The Contractor Certification of Wage Law Compliance must be signed and included.

17. The Statement of Bidder’s Qualifications must be completed, signed, and included.

18. The bidder awarded will be required to sign the City of Oak Harbor Small Public Works

Contract. An example has been included.

SECTION IV

DETAILED MINIMUM SPECIFICATIONS: WAC 173-160

SPECIFICATIONS: Specifications are to be met or exceeded.

EXCEPTIONS: The bidder must list any exceptions (major minor) to the specifications. The bidder must prove “an equal,” in writing with citation(s). The information must be in the bid package and cannot be supplied later.

Well 9 Replacement – Drilling and Testing Specific Requirements

The City of Oak Harbor (City) is developing a new emergency groundwater supply at its Well 9 site. The City requires construction of a new well to replace existing Well 9 on the same parcel as shown on the attached Exhibit B - Site Map, Vicinity Map. Drilling will consist of advancing a temporary 16-inch-diameter steel casing to a depth of 20 feet to create a sanitary seal and a permanent 12 inch-diameter casing to a maximum depth of 202 feet, depending on aquifer characteristics identified during drilling. The boring will be completed with a wire-wrapped stainless steel well screen either as a naturally developed well or with a sand filter pack depending on aquifer characteristics identified during drilling. The City’s representative, RH2 Engineering, Inc. (RH2) will observe drilling and testing activities and will provide a well screen design for the Contractor.

The well may be drilled with rotary or cable tool methods. If air rotary drilling is used, the contractor shall supply and operate a vortex soil sampling device to aid in soil sample identification. The selected method must be capable of reaching the target depth, retrieving representative samples of aquifer materials as drilling proceeds, and constructing the new well.

The existing Well 9 well log indicates that a sand aquifer occurs at depths ranging between 180 to 243 feet below ground surface (bgs). Static groundwater level within the aquifer occurs at approximately 180 feet bgs. Layers of dense glacial till, and clay overlie the sand aquifer.

Well driller log for existing Well 9 and nearby City wells 8 and 11 are attached in Exhibit A – City Well Logs.

All well drilling and construction shall comply with WAC 173-160.

Final drilling depth will be determined based on observations by RH2. Actual quantities will be determined in the field by RH2 as the work progresses and will be paid according to the Schedule of Prices in the bid forms and described in the Measurement and Payment section below. Well screen dimensions will be selected based on drilling observations and grain-size analysis of representative aquifer materials. The well screen dimensions will depend on the characteristics of the aquifer encountered during drilling. The well will be developed using mechanical surging and pumping methods until the well water discharge is free of sediment.

After the drilling, well installation, and well development, the Contractor will install a temporary pump and discharge system to perform step-rate and constant-rate well and aquifer testing and to support collecting water quality samples from the wells.

Contractor Expectations

Once the Notice to Proceed is issued, the Contractor has 180 calendar days to complete the work to substantial completion. Substantial Completion is completion of Task Numbers 1 through 11 in the Bid Schedule.

EXCEPTIONS:_____________________________

All work incidental and necessary for the completion of the well drilling, well construction, and testing shall be performed by the Contractor.

EXCEPTIONS:

The Contractor will be responsible for coordinating required inspections by RH2, providing advance notice to minimize construction delays. The Contractor must comply with the requirements of Chapter 173-160 Washington Administrative Code (WAC) and obtain drilling permits for the Project.

EXCEPTIONS:

The Contractor is solely responsible for all elements of site safety. Inspections performed by RH2 are only to monitor and record that the construction is complying with the design intent.

Damage to existing utilities or property shall be repaired or replaced by the Contractor at the discretion of the City.

EXCEPTIONS:

The Contractor shall be responsible for managing, coordinating, and overseeing its subcontractors, suppliers, manufacturers’ representatives, or any other persons involved with the Project. The Contractor shall have a competent representative familiar with the Project during any activities performed onsite.

The Contractor shall provide and pay for all labor, materials, equipment, tools, construction equipment, machinery, fuel, and other facilities and services as necessary for the proper execution and completion of the Project.

The Contractor acknowledges the nature and location of the Project; the general and local conditions, particularly those bearing upon availability of transportation, disposal, handling and storage of materials, availability of labor, water, electric power, roads, and uncertainties of weather, road conditions, access, or similar physical conditions at the site; the conformation and conditions of the ground; the character of equipment and facilities needed preliminary to and during the progress of the Project; and all other matters that can in any way affect the Project or the cost thereof under the Contract.

EXCEPTIONS:

The Contractor further acknowledges that he/she knows the character, quality, and quantity of surface and subsurface materials to be encountered from inspecting the site, all exploratory work done by the City, and information presented in this Project summary.

All drilling equipment, tools, casings, and other downhole components must be pressure-washed before use in the bore hole, prior to mobilization to the Project sites. No chemical cleaning agents will be allowed.

Project and Site Conditions

Potable Water for Drilling

Water used for drilling activity will be made available by the City at the nearest City hydrant as shown on the Site Map in Exhibit C.

Cutting and Groundwater Management

All drill cuttings and well development sediment generated from drilling activities shall be managed by the Contractor and contained at a temporary on-site storage at the location shown on the Site Map for subsequent off-site disposal by the Contractor. All groundwater generated during well drilling and development water generated during bailing or swabbing will be contained for settling and allowed to infiltrate near the well at the location shown on the Site Map. All groundwater from well testing will be discharged into the City stormwater system as shown on the Site Map.

Well and Aquafer Protection

The Contractor is responsible for aquifer water quality during the Project and should take all means necessary to protect the water quality. This shall include, but is not limited to, the use of vegetable oil in construction hydraulic equipment, immediate fuel or lubricant spill containment and cleanup if it occurs during construction, installation and maintenance of temporary erosion and sedimentation control (TESC) devices, and all other work necessary to protect the water quality of the well.

The Contractor shall install a plastic barrier beneath all stationary equipment that contain hazardous chemicals. This includes, but is not limited to, drill rigs, backhoes, service vehicles, generators, portable engines, and hydraulic jacks. Plastic tarps shall be seamless and have a 10 mil (0.010 inch) minimum thickness. A 6-inch curb shall surround the plastic barrier for containment. Upon completion of the production well, the plastic barrier shall be disposed of in accordance with applicable federal and state regulations.

The Contractor shall always have a spill control kit onsite. At a minimum, the pads, pillows, and booms in the kit will have the ability to absorb at least 20 gallons of fuel or oil (e.g., diesel, gasoline, motor oil, etc.).

The Contractor must adhere to all requirements of federal, state, and local statutes and regulations dealing with pollution, and follow all applicable OSHA and WISHA regulations for Project-related work.

Storage of On-Site Materials

Well drilling equipment and materials stored on site shall be secured to maintain their quality and fitness for work. Equipment and materials shall be placed on wooden platforms or other hard, clean surfaces (not on the ground), and/or they shall be placed under cover. Stored materials shall be located to facilitate prompt inspection. The Contractor is required to fence its storage area and is responsible for damage or loss of stored equipment, tools, or materials, and for public injury resulting from the use of the storage area. Hazardous materials and materials that constitute a potential threat to aquifer contamination shall not be stored at the Site. This includes fuel oils, hydraulic fluid, and solvents that, if required, must be moved onto the Site as they are consumed and must not be stored.

All spills and leaks shall be immediately contained, reported, and cleaned up as required by state and local regulations and Washington State Department of Ecology (Ecology) guidelines. Spills and leaks cannot be the cause for claims of delay by the Contractor. Upon detection of a chemical leak, the Contractor shall immediately stop work and correct the leak, contain the spill, and remove the contaminated material from the site for proper disposal at the Contractor’s expense. The Contractor shall over-excavate the contaminated site at least 2 feet in all directions to confirm that the spilled material has not penetrated further. Sampling and analysis of the soil in the excavated area may be required for confirmation at the Contractor’s expense.

Construction Vehicles

Wherever construction vehicle access routes intersect paved roads, provisions must be made by the Contractor to minimize the transport of sediment onto the paved road. The Contractor shall remove all dirt, mud, rocks, vegetation, and other deleterious material from all construction equipment prior to leaving the site. This may include spray washing, sweeping, or other physical methods as necessary to remove materials.

If sediment or other debris is transported onto a paved road surface, the road shall be cleaned thoroughly by the end of the workday. Debris shall be removed from roads by shoveling and/or sweeping. Street washing shall be allowed only after debris has been removed in this manner.

The Contractor shall provide and maintain their own restroom facilities.

Noise Control

The Contractor shall take special precautions to reduce the noise level from work activities. All work required to be performed by the Contractor shall normally be done between the hours of 7:00 a.m. and 6:00 p.m. local time, Monday through Friday.

The Contractor shall provide a minimum of 3 working day notice to the City’s representative if, at any time, it becomes necessary or the Contractor desires to work at times other than those specified herein or as approved in advance by the City. Approval of any proposed alternative work schedule shall be at the sole discretion of the City.

Continuing operation of a pumping test past 6:00 p.m. local time is permissible with 48 hours advance notice and City approval by the City Building Official.

Standby Time

Standby Time would be authorized at a Contract-approved hourly rate for Project-related activities, including the City’s water monitoring or sampling, and when the drill rig and crew are required to remain idle. Standby time does not include equipment failures or required maintenance, the Contractor's negligence, or similar causes. For cost estimating purposes, 8 hours of standby time shall be included in the Contractor’s bid to allow the City and/or their representatives to conduct tests or measurements and shall not be paid separately.

Determination of standby time will be made jointly and approved by the City at the time of occurrence. Notation of all standby time shall be inserted on the daily drilling report and initialed by the City during the working day in which the standby time occurred.

Site Protection and Restoration

The Contractor shall use the utmost care in executing the well drilling and development to disrupt as little of the job site as necessary.

The Contractor shall use only that area designated by the City as the access and working limits.

The working limits, in general, will be limited to the access road and construction limits shown on the Site Map.

The Contractor shall install TESC to contain drilling cutting and discharge water to prevent its migration off the Site.

The Contractor shall restore all disturbed areas within the construction limits to a condition equal to or better than the site was before the construction operation. The Contractor shall clean up debris and unused material and remove them from the site and restore the site to equal or better condition than before construction began.

EXCEPTIONS:

General

The Contractor shall have a State of Washington licensed well driller with a valid Washington State Water Well Construction and Operator’s License under Chapter 18.104 Revised Code of Washington (RCW).

EXCEPTIONS:

The Contractor shall meet or exceed all requirements of Chapter 18.104 RCW – Water Well Construction, Chapter 173-160 WAC – Minimum Standards for Construction and Maintenance of Wells, and Chapter 173-162 WAC – Regulation and Licensing of Well Contractors and Operators.

EXCEPTIONS:

The Contractor shall submit and pay for the well start card to Ecology prior to mobilization, as specified in WAC 173-160-151.

Required Inspections and Notification

The City or RH2 will be in the field part-time during drilling activities. RH2 will observe the drilling activities for compliance with this contract summary, manage sampling activity, and design the test well. The Contractor shall notify the City or RH2 in advance when drilling has reached or is anticipated to reach the following referenced milestones.

The Contractor must contact the City at the stages of construction listed later in this section for the purpose of job inspection. No work shall be performed by the Contractor on the next stage of work until such inspection has been made for the items below.

The Contractor shall notify the City at least 24 hours prior to each of the required inspections to ensure that the City or RH2 will be available to conduct the inspection. Inspection of each item by the City is required before proceeding to a subsequent stage of the Contract. A list of required inspections is as follows:

1. Mobilization/Setup – the City or RH2 shall approve drill rig working area setup and drill cutting containment prior to beginning any drilling activities.

2. Well Seal Depth – the City or RH2 to be onsite to confirm the well seal depth.

3. Drilling progress – RH2 will periodically inspect drilling activities.

4. Water quality testing – RH2 will observe short-term water quality testing.

5. Screen Installation and Development – RH2 will be onsite to inspect the well screen assembly prior to installation. The well screen assembly shall be constructed by the Contractor based on the design that will be provided by RH2. RH2 will observe the installation and development of the screen.

6. Well Testing – RH2 will be onsite during step-rate testing and constant-rate testing.

RH2 will obtain water quality samples at the end of the constant-rate portion of well testing.

7. Video Inspection – RH2 will be onsite during the video inspection.

EXCEPTIONS:____________________________

Well Casing Each section of new 12-inch diameter drilling casing and temporary 16-inch diameter drilling casing mobilized to the job site shall be black steel (ASTM A53 Grade B) seamless pipe. The temporary casing may be new or used at the option of the Contractor. Each casing section shall be high pressure-washed or steam cleaned prior to installation below the ground surface. All casings shall have a minimum wall thickness of 0.375 inches.

Well Screen Assembly The well screen shall be either a 12-inch-diameter telescoping or 8-inch diameter pipe-size well screen, wire-wrapped, continuous slot well screen manufactured from Type 304 Stainless Steel by Johnson (Hi-Flow) or equivalent. The wire-wrap shall be of a triangular cross-section, and the longitudinal rods shall have a circular cross-section. The well screen tailpipe and riser shall consist of blank sections of Type 304 Stainless Steel. The tailpipe shall be sealed with a welded stainless-steel plate that is at least 0.375 inches thick.

For a telescoping screen completion, the riser casing shall be fitted with three self-sealing, neoprene rubber K-packers. For a pipe-size completion, the riser shall include a short section of well screen for pressure relief. The riser length shall be determined by RH2.

Screens shall be of sufficient tensile, column, and collapsing strength to withstand the stresses associated with the depth, installation, and hold-back of the formation during operation.

For a pipe-size well completion, filter pack material shall consist of washed and graded inert sand filter material with gradation selected by RH2.

Drive Shoes

The lower end of the well casing shall be fitted with a new drive shoe of the materials and a configuration required to prevent damage or distortion to the casing during well drilling. The shoe shall have a beveled and tempered cutting edge of forged, cast, or fabricated metal, as required by the drilling method and subsurface soil conditions. The drive shoe for the temporary surface seal casing may be new or used at the option of the Contractor.

Grout Materials

Neat Cement Grout. Portland Cement Types I, II, III, or high alumina cement mixed with not more than 6 gallons of clean water per bag of cement (1 cubic foot or 94 pounds). The grout shall contain 5-percent bentonite to prevent shrinkage.

Pea Gravel

Pea gravel shall consist of naturally occurring granular material consistent with WDOT 9-03.5. It shall be free from various types of wood waste or other extraneous or objectionable materials. It shall have such characteristics of size and shape that it will compact.

Bentonite

Granular bentonite, if used as a sealing material, shall be composed of dry, medium-sized bentonite chips such as Enviroplug ®.

Drilling Activities

General

The well boring shall be completed using rotary or cable tool methods with the ability to install casing, collect representative soil (air rotary requires a vortex soil sampler) and groundwater samples, and install a permanent well screen with or without a filter pack.

The Contractor shall provide a drilling rig with sufficient capability to reach the desired maximum depth of 250 feet. The drilling operations shall allow the casing string to be installed in conjunction with drilling, the casing to be withdrawn at any time, and the performance of all other work required.

Heaving conditions may be controlled by adding potable water to the casing string and, if necessary, by maintaining a plug of soil at the bottom of the casing.

The Contractor shall notify the City immediately when drilling conditions unexpectedly change or when unusual drilling conditions are encountered. Examples of unusual drilling conditions include encountering rock, heaving sands, or organic soils. The Contractor shall document the time, date, and depth when such conditions are encountered.

Static water level measurements shall be made and recorded by the Contractor every morning before beginning the day’s work, or as directed by the City or RH2.

Installation of Steel Casing

Installation of the casing shall be advanced concurrent with the drilling and shall be maintained within 5 feet of the bottom of the hole, or as allowed by the City or RH2.

If the drive shoe will prevent installation of the well screen, the drive shoe shall be cut before attempting to install the well screen. The shoe shall be cut no higher than 3 feet above the end of the casing and shall be sealed from the rest of the borehole with bentonite chips.

Material Containment and Disposal

The Contractor shall control discharge of sediment and water produced during drilling activities.

Sediment will not be allowed to be discharged away from the drill site, and the Contractor will be responsible for capturing and managing any solids produced and placing it in the temporary cuttings containment area (Exhibit B - Site Map) before transporting it offsite for disposal.

Aquifer Material Sampling

The Contractor shall collect representative samples directly from the discharge stream (air rotary with a soil vortex sampler for air rotary) or sand bailer (cable tool).

EXCEPTIONS:

The Contractor shall take care to collect samples that represent both the fine-grained fraction and the coarse-grained fraction of the formation penetrated.

Samples shall be collected every 5 feet. Samples shall also be taken every time the soils change character. The Contractor shall retain samples in 1-gallon heavy-duty sealable polyethylene bags.

The Contractor shall label each sample with the project name (Oak Harbor Well 9R), the depth, and the date. Samples shall remain onsite and available for inspection by the City or RH2.

Well Screen Design

RH2 shall obtain representative soil samples from the Contractor and will submit the samples to a soil laboratory for grain-size analysis.

EXCEPTIONS:

The City or RH2 shall present the screen design to the Contractor within ten (10) working days after RH2 has received the soil samples from the Contractor. It is assumed that the Contractor will require twenty (20) working days for the order, delivery, and fabrication of the well screen.

The Contractor must provide a written request with documentation supporting the request for additional time to the City. These time delays are planned and do not warrant standby time.

Installation of Well Screen Assembly

The well screen shall be installed in accordance with WAC 173-160-191 by the pull-back method, and the Contractor shall have adequate jacks to enable the casing to be pulled back to expose the screen. Any deeper portion of the borehole unused for well completion will be sealed in accordance with Chapter 173-160 WAC. The casing string shall be advanced through the formation to be screened and the hole cleaned to the level where the bottom of the screen is to be placed. The screen assembly shall then be lowered to that level and temporarily held at the required level as the casing raised until the screen is fully exposed. For a sand filter completion, sand filter media will be added incrementally to the casing as the casing is retracted and the Contractor will make reasonable efforts to settle the filter material as the casing is retracted. The Contractor will confirm the level of sand in the casing before adding additional sand filter as the casing is retracted.

Installation of Well Screen Assembly

The well screen shall be installed in accordance with WAC 173-160-191 by the pull-back method, and the Contractor shall have adequate jacks to enable the casing to be pulled back to expose the screen. Any deeper portion of the borehole unused for well completion will be sealed in accordance with Chapter 173-160 WAC. The casing string shall be advanced through the formation to be screened and the hole cleaned to the level where the bottom of the screen is to be placed. The screen assembly shall then be lowered to that level and temporarily held at the required level as the casing raised until the screen is fully exposed. For a sand filter completion, sand filter media will be added incrementally to the casing as the casing is retracted and the Contractor will make reasonable efforts to settle the filter material as the casing is retracted. The Contractor will confirm the level of sand in the casing before adding additional sand filter as the casing is retracted.

The Contractor shall maintain a clear hole, free of debris, cuttings, and sediment throughout the full depth of the hole, and before and during casing and screen installation.

Well Surface Seal

Upon completion of all development and pumping tests, the Contractor shall install a 16-inch-diameter 20-foot-deep surface seal per Chapter 173-160 WAC. The Contractor shall seal the well using bentonite per WAC 173-160-221. The Contractor shall place the bentonite from the bottom of the 16-inch temporary casing annulus to the ground surface using a tremie pipe in one continuous operation.

EXCEPTIONS:

Well Temporary Cap

Upon completion of all development and pumping tests, the Contractor shall seal the upper completion of the well, per WAC 173-160-301, with either a welded cap or a mechanically secured cap that is equally tamper-resistant.

EXCEPTIONS:

Repair/Restoration

Any well on which the Contractor stops work shall be considered abandoned. A new well shall be started in the immediate vicinity at a location designated by the City or RH2. Payment will be made for work associated with the abandoned well if the conditions for abandonment are based on drilling refusal due to natural conditions. No payment will be made for work associated with the abandoned well if the Contractor stops work for equipment failure, equipment loss, or improper drilling methods or similar reasons. The Contractor may, at his own expense, remove any un-grouted casing from the abandoned well. An abandoned well shall be backfilled and sealed by grouting in accordance with WAC 173-160-381.

Well Development

The well will be developed at the completion of the screen installation. Development of the well shall be performed by the Contractor to remove sand and fine material from the strata penetrated by the well screen and to stabilize the remaining sand and fine material in the strata so that the well will yield water with a low suspended solids content. Development shall not unduly settle or disturb the strata above the screened interval. Development will be complete based on indications of sediment yield produced from the aquifer as determined by RH2 or the City.

At a minimum, the well shall be developed by mechanical surging with a surge block attached to a drill stem or string of pipe. This system shall operate the surge block at a rate of ten 24- to 36-inch-long strokes per minute. Sediment shall be periodically removed from the well during development and shall be contained on site with drill cuttings (Site Map – Exhibit B).

Development water must be discharged to a location shown on the Site Map for onsite infiltration.

Well Testing

The Contractor shall notify the City not less than two (2) working days in advance of the date and hour when the Contractor will be prepared to start pumping test operations. The start date and hour selected shall be a regular day shift, Monday through Thursday, excluding holidays.

The Contractor shall furnish, install, operate, and remove all pumping equipment, throttling devices, valves, piping, measuring instruments, and the wastewater disposal conveyance system required for pumping tests of the well, and shall provide personnel to continuously operate and maintain the equipment during the pumping tests and recovery.

Pump Test Operations

The Contractor shall furnish and operate the equipment and appurtenances necessary to obtain water samples, measure the well pump flow, and control the pump flow within 95-percent (%) accuracy while discharging the water at an on-site location specified by the City or RH2. Use of redundant flow metering is required (e.g., orifice plate and in-line flow meter). The Contractor shall have sufficient communication capability to adjust the flow rate if the discharge point is distant from the wellhead.

Test Pump The Contractor shall furnish, install, operate, and remove all pumping equipment, throttling devices, valves, piping, measuring instruments, and the wastewater disposal conveyance system required for pumping tests of the well, and shall provide personnel to continuously operate and maintain the equipment during the pumping tests and recovery.

The pumping equipment shall be capable of lifting water from a depth of up to 220 feet and maintaining a flow of up to 400 gallons per minute (gpm) and vary the pumping rate from 200 to 400 gpm. The pumping equipment shall include all required electrical and mechanical accessories, appurtenances, and controllers for proper and continuous operation of the pump during the testing period. The pumping equipment and power source shall be capable of continuous operation for up to 12 hours without stopping for maintenance, fueling, or other causes. The City shall approve the pump location in the well.

The power source may be either electrical service from an engine generator or an engine with direct drive. The Contractor shall make all arrangements for any necessary electrical service by the utility company, perform all electrical work, and provide and install all electrical wiring and devices for operation of the pump.

A check valve must be used to prevent backflow of water in the riser pipe into the well, which could result in unreliable recovery data. Recovery measurements shall be recorded with the same frequency as those taken during pumping.

All down hole testing equipment associated with the test pump that will be placed in the well shall be pressure-washed before use in the bore hole. No chemical cleaning agents will be allowed. Decontamination shall occur before mobilization to the project site.

Water Level Monitoring Drop Tube

The Contractor shall provide one 1-inch-inner-diameter pipe to act as a drop tube for water level measurement during well testing.

EXCEPTIONS:

The Contractor will secure the drop tube to the pump column, and the drop tube will be used to install a well water level pressure transducer datalogger provided by RH2.

The same drop tube will be used for a manual operated electric tape water level probe (provided by the Contractor). The well level probe must be accurate to 0.01 feet and long enough to reach the full length of the drop tube.

The drop tube shall extend from the top of the well to 5 feet above the pump intake. The drop tube must contain sufficient slots or holes to allow for the free passage of water into and out of the pipe to allow for accurate water level measurement over the length of the pipe. The bottom of the drop tube shall be capped.

EXCEPTIONS:

Discharge Piping

The Contractor shall provide and install temporary piping with sufficient pressure rating, bends, and thrust blocking to transmit the test water to the point of discharge. The piping must be sufficient to convey up to 400 gpm. The piping will partially cross 6th and Heller Street and the Contractor will install a protective berm over the discharge lune (pipe ramp or similar) and provide traffic control and signage for the pumping test. Submit traffic control plans for review and approval by the City.

EXCEPTIONS:

Erosion will not be permitted between the well and point of discharge. The Contractor shall provide a hard surface or other mechanical means or structures as necessary to mitigate erosion.

A map of the groundwater testing discharge location is shown in Exhibit C.

The discharge system shall be constructed to carry pumped water from the well to the discharge location using components with water-tight connections. No more than 5 gpm will be permissible from any connection or joint in the discharge system and no more than 20 gpm combined total leakage will be permitted. If excessive leakage occurs, RH2 may require cessation of the test, repair of the connection, and repeat of the entire test with the cost born by the Contractor.

Water Flow Meters

All meters must be accurate, calibrated within 30 days of use on the project, and installed according to manufacturer specifications.

Water Quality Sampling Spigot

The Contractor shall furnish the equipment and appurtenances necessary to obtain water samples from the discharge line through an operable hose spigot located near the wellhead.

Flow Control Valve The Contractor shall furnish and operate the equipment and appurtenances necessary to control the pump flow within 95-percent accuracy while discharging the water at an on-site location specified by the City or RH2.

The Contractor shall obtain all necessary construction dewatering permits for the site and shall provide any necessary treatment prior to discharge and as required by the permit. Discharge water during well development and testing may be directed to the City storm system at a rate not to exceed 250 gpm, or as determined by RH2.

Installation of Test Pump All downhole testing equipment associated with the test pump that will be placed in the well shall be pressure-washed before use in the borehole. No chemical cleaning agents will be allowed. Decontamination shall occur before mobilization to the project site.

Confirmation of System Operation After the test pump, discharge piping, and other associated equipment have been installed and constructed, the Contractor shall operate the pump for 30 to 60 minutes to confirm the operation of all equipment, meters, and development, and to set the initial test rate for step-rate testing.

During this period, the flow rate should be adjusted to determine whether the desired steps are achievable. The dual meter system should be compared to see if it is recording the same flow and if the pump discharge can be controlled. Depth-to-water measurements should be taken, and the discharge location should be checked to ensure water is not backing up and overflowing the point of discharge.

RH2 will observe and approve the initial testing before authorizing the step-rate testing.

Pumping Test

The step-rate portion of the test will be performed to evaluate well efficiency and specific capacity and to determine the pumping rate for the constant-rate portion of the test, which will occur immediately following the step-rate test.

The step-rate test shall not be started until the well has recovered to a stable water level as determined by the City or RH2.

EXCEPTIONS:

The three steps will last 60 minutes each.

EXCEPTIONS:

The constant-rate test will last 24 hours.

EXCEPTIONS:

The Contractor shall support RH2 with managing the generator, pump, discharge, and water level measurement during the entire step-rate and constant-rate portion of the test. If the access port, pipe, or other appurtenances required by RH2 for water level measurements do not allow the accurate collection of water level measurements during the test, or if the pump and/or generator fail to consistently maintain the discharge rate within 5 percent of the target rates, then the test shall be restarted after a recovery period determined by the City. The costs for the aborted test will be borne by the Contractor.

EXCEPTIONS:

Manually measured groundwater level in the well will begin immediately upon pump shut-down during the well recovery for 30 minutes. Electronic groundwater level monitoring will continue overnight and until the water levels have reached 95 percent of the initial, pre-pumping static water level.

EXCEPTIONS:

Recovery

The pump and measurement devices shall not be removed until the tests are completed, including the recovery phases. Recovery measurements should commence immediately upon pump shutdown and continue for the same duration as the pumping phase, or until the water level reaches 95 percent of the initial, pre-pumping static water level.

RH2 will inform the Contractor when the recovery portion of the test is considered complete.

Testing Conclusion

The pump and measurement devices shall not be removed until the tests are completed, including the recovery phase. The City or RH2 will inform the Contractor when testing has been successfully completed, and removal of equipment can proceed. The City or RH2 will remove the pressure transducer data logger from the well. The Contractor will be responsible for the removal of all other Contractor-provided equipment from the well and adjacent site.

Video Inspection

Following removal of the test pump, the Contractor shall provide a video inspection of the well.

The video inspection shall be performed by the Contractor or a subconsultant, each of whom must have demonstrated experience and proper equipment for television well inspection. The camera shall have lights, produce color video, produce high-definition video, and switch between side and downhole views. The Engineer shall observe the inspection and be provided with an electronic recording of the inspection on a DVD or a thumb drive. The video recording shall show depth at all times in feet to the nearest 0.1 foot. The Contractor shall open the well-side port for a sufficient duration to purge the casing of stagnant, cloudy water. The cost of a second video inspection due to poor water clarity caused by not purging the well sufficiently shall be borne by the Contractor.

EXCEPTIONS:

Disinfection

After the well has been completed and tested, it shall be disinfected in accordance with American National Standards Institute/American Water Works Association (ANSI/AWWA) C654. All chlorinated water shall be discharged to the ground near the well.

Measurement and Payment See Technical Specifications in Exhibit D Special Conditions

No. 1 – Mobilization/Demobilization

The lump-sum price shown shall cover the full cost of furnishing all work and materials necessary to move and organize equipment and personnel required to complete the Project. The price will also include providing and maintaining all necessary support facilities, obtaining all necessary permits and licenses, and maintaining the Site and access area during all drilling activities. The price shall include materials and labor to move all personnel and equipment from the Site after project completion. The price shall include the construction and removal of TESC.

The price shall include installing and removing a temporary construction security fence at least

6-feet tall surrounding the well-drilling and testing area.

The City shall clear the well-drilling location and stake it at the site.

The price shall cover the cost of all materials, labor, and equipment to restore the overall work site to its original condition. Payment shall be a lump sum. No more than 50 percent of this item will be paid to the Contractor prior to final demobilization from the project site.

Bollards will need to be temporarily removed for equipment access, which can be done by hand.

If further park augmentation is necessary, coordinate with the City.

No. 2 – Install Sanitary Seal

The linear foot price shown shall cover the complete cost of labor, equipment, and materials necessary to drilling a 16-inch diameter boring with simultaneous advance of a temporary 16-inch diameter casing to a depth of 20 feet, provision of a drive shoe, representative sample collection, installation of bentonite grout, a shoe cut, and removal of the temporary casing. Measurement shall be per linear foot of temporary casing successfully installed.

No. 3 – 12-inch Drilling

The linear foot price shown shall cover the complete cost of labor and equipment necessary for drilling and advancing the 12-inch diameter casing. This bid item includes drilling and representative sample collection but does not include the cost of casing. Measurement shall begin at 20 feet below ground surface and proceed to a maximum depth of 250 feet (230 feet of drilling) and shall be per linear foot of drilling.

No. 4 – Furnish and Install 12-Inch Diameter Well Casing The linear foot price shown shall cover the complete cost of all materials, labor, and equipment necessary for furnishing and installing all required 12-inch diameter casing and drive shoe, and a cap or plate on the 12-inch diameter casing with a 2-inch inside diameter threaded access port, and temporary attachment of the Ecology unique well ID tag to the casing. This bid item includes cleaning, trimming, welding, centralizing, and stringing, but does not include drilling.

Payment shall be per linear foot of casing installed below ground surface after well screen assembly installation plus 2 feet above ground surface. A pull-back of 50 feet is assumed for costing purposes and the total length of installed casing is assumed to be 202 feet.

No. 5 – Plumbness and Alignment Testing of 12-Inch Casing

The lump sum-price shown shall cover the complete cost of a plumbness test and a 20-foot blank alignment test. Alignment shall be tested by lowering a section of pipe or dummy 20 feet long into the casing, which shall move freely throughout the test interval. The outside diameter of the pipe or dummy shall not be more than 0.5 inches smaller than the inside diameter of the casing being tested. If the casing does not allow the section of pipe or dummy to pass freely to the top of the casing, the boring shall be decommissioned, re-drilled and cased at the Contractor’s sole cost.

EXCEPTIONS:

The plumbness test shall be performed by the Contractor as described in Appendix D of ANSI/AWWA A100-06. If the well casing deviates more than allowed in the AWWA standard, the boring shall be decommissioned, re-drilled and cased at the Contractor’s sole cost.

EXCEPTIONS:

No. 6 – Furnish Well Assembly

The cost for this item shall be the invoice cost paid by the Contractor for purchase and delivery of well assembly materials to the Contractor yard or the well site plus 15 percent markup. Well assembly materials will include blank casing for tailpipe and risers and blank screen sections, stainless steel wire-wrapped screen, weld rings, centralizers, bail bottom, pea gravel and bentonite for backfill, and filter pack materials, if used. The Contractor will not include a cost for this item; a placeholder value of $15,000 to be used for all bids is included for this item.

No. 7 Assemble and Install Well Screen Assembly The per hour unit price shall cover the complete cost of the labor and use of equipment and materials to assemble and install the furnished well screen assembly materials. This assembly installation includes the cost to clear the borehole of drilling fluid and cuttings, backfilling the lower borehole, if necessary, assembling the screen and blank sections with tailpipe and riser, and to lower the well screen assembly to the bottom of the borehole. Payment shall be per hour of work. Assume 20 hours for this bid item.

No. 8 Well Development and Other Authorized Work

The hourly rate price shall cover the complete cost of all labor, material, and equipment necessary to develop the screen. Payment shall be per hour of well boring/well screen development.