B08_Attachment_1__Statement_of_Work_(SOW).docx

PROJECT TITLE:

Short Canyon Well Replacement and Abandonment

Table of Contents

SOW 1.0 Background on the Government’s Requirement

Short Canyon is located on the northeast side of Kelso Valley, south of the town of Weldon in Kern County, California. In the 1930’s, an agricultural water well was developed in Short Canyon to support livestock grazing on the high-desert federal rangeland. Though the Short Canyon well produced consistent water for decades, it is currently non-functional due to rusted steel casings, blockages as a result of vandalism, and drought conditions reducing the water supply at the current depth. In order to comply with Draft U.S Department of Interior FY 2026-2030 Strategic Priorities 1.2, 2.2, 2.3, and 3.1, the Government wishes to restore this agricultural water source by drilling a new well in Short Canyon.

The previous well at Short Canyon was 250 feet deep with 6-inch casing. It consistently produced 2-4 gallons per minute (gpm) until it stopped functioning due to heavy vandalism. The well was closed with a welded cap in 2004 to prevent further vandalism. According to the California Division of Water Rights Well Completion Reports, neighboring domestic wells range in depth from 142-307 feet, with an average depth of 228 feet and 220-330 feet to static water. Figure 1 and Figure 2 below show the location of the previously capped Short Canyon well. The expected location of the new well is in the general vicinity of the old well. The Contractor shall work with the COR to determine the exact location.

SOW 2.0 General Scope of Work

The Contractor shall furnish all professional services necessary to execute the project in strict accordance with the specifications described herein.

The Contractor shall:

· Submit a comprehensive technical proposal to drill, case, and complete a new 6-inch non-potable livestock water well at Short Canyon as outlined in Section 4.

· Properly abandon the existing non-functioning 6-inch well at the Subject Property according to Kern County Well Abandonment procedures

· Furnish all necessary labor, materials, and equipment to accomplish all tasks identified within this Statement of Work

Place of Performance:

The work will take place on public land administered by the BLM in the vicinity of Weldon, CA in Kern County. Access to the work site is by Kelso Creek Road and then by way of a dirt two-track route.

The dirt turn-off route (35.635643, -118.245277) to Short Canyon is 2.8 miles south from the intersection of Kelso Creek Road and Highway 178. The well site (35.638457, -118.234286) is approximately 0.7 miles east of Kelso Creek Road (see map below).

Period of Performance:

The Contractor shall complete all the work tasks within one year of the award date. All material shall be on hand or readily available from local stock before work shall begin.

Figure 1: Short Canyon Well Vicinity

Figure 2 Short Canyon Well Location

SOW 3.0 Overall Objective(s)

The Government’s objective is to restore a sustainable livestock water supply by drilling and completing a new non-potable water source that meets established state and NRCS technical standards, while properly abandoning the existing failed well and delivering a fully functional, documented, and regulatory-compliant water source for ongoing grazing operations in Short Canyon with a minimum pump rate of 2-4 gpm.

SOW 4.0 Specific Tasks

Task 1: The Contractor shall obtain a well drilling permit and a well demolition permit from the local regulating agency prior to the commencement of drilling work.

Task 2: The Contractor shall perform all necessary tasks to drill and develop a livestock water well, with 6-inch casing and a temporary cap (see NRCS Water Well Specifications). The well shall be drilled in the general vicinity of the existing non-functional well, with the final location being approved by the COR.

The previous well at Short Canyon was 250 feet deep with 6-inch casing. It consistently produced 2-4 gpm until it stopped functioning due to heavy vandalism. The well was closed with a welded cap in 2004 to prevent further vandalism. Neighboring domestic wells range in depth from 200-400 feet. Current water depth of the capped well is unknown.

Task 3: The Contractor shall provide and install 6-inch casing the whole depth of the well (with at least 12 inches above ground or at the level of the highest flood risk) and install any needed screen and filter packs in accordance with industry standards. The Contractor shall disinfect and seal the well according to the specifications listed in Exhibit 1.

Task 4: The final well completion shall be designed and installed by a licensed C-57 water well drilling contractor, except where exempted by law. Work shall meet the requirements set forth by the local regulating agency, which themselves equal or exceed those listed in the California State Water Well Standards. The Contractor will abandon the existing well according to county, state and federal standards and as detailed in Exhibit 2. Short Canyon well was previously closed with a welded cap. (https://water.ca.gov/Programs/Groundwater-Management/Wells/Well-Standards/Combined-Well-Standards).

SOW 5.0 Delivery / Performance Schedule

Contractor shall notify the COR when the well drilling permit is obtained, and the well is scheduled to be drilled and developed. The Contractor will notify the COR when abandonment actions are scheduled and will complete those actions within six months of the contract award.

The Contractor shall provide the Government with the following:

· Valid permits of all applicable permits with local and state agencies, including Kern County Environmental Health Division.

· A comprehensive Well Completion Report (aka drill log) detailing the well casing construction and noting the depth to static water

· Pump tests, including a step-drawdown test to identify the critical pumping rate to avoid cavitation, a constant-rate test for 24 hours to determine the aquifer drawdown and establish the sustainable yield and recovery.

· A water quality analysis complying with California Code of Regulations (CCR) Title 22 standard for Primary and Secondary Maximum Contaminant Levels to determine the baseline water quality.

SOW 6.0 Government-Furnished Property, Materials, Services

The Contractor shall furnish all personnel, materials, equipment, supplies, facilities, transportation, tools, materials, supervision, and other items and non-personal services necessary to perform the work tasks defined in this Statement of Work.

SOW 7.0 Security and Administrative Matters

Vehicular and Equipment Access:

The work site is within rural rangeland with rough, uneven, and narrow unimproved dirt access routes. All gates should be left as they were found. The Contractor should familiarize themselves with the condition of the route before bringing equipment to the sites.

Work site limitations:

Work sites are rural locations and do not have any utilities such as power or water sources or restroom facilities.

Security:

The Contractor shall be responsible for safeguarding all Government property provided for Contractor use or under their control, including securing all facilities the Contractor may access after normal business hours. Contractor shall coordinate work schedule with Contracting Officers Representative to minimize public and employee ingress/egress to the work site.

Safety:

The Contractor shall not require, or allow any employee, engaged in the performance of this Contract to work under conditions which are unsanitary, hazardous, or dangerous to his/her health or safety, as determined under safety and health standards promulgated by the Secretary of Labor under Section 107 of the Contract Work Hours and Safety Standards Act (40 U.S.C. 327 et seq.) as amended and other Federal, State and applicable local government safety standards.

Department of Labor Code of Federal Regulations Title 29 and other Federal, State and local government safety standards will apply in its entirety to the Contractor. Examples of applicable safety standards are OSHA 29 CFR 1910, OSHA 29 CFR 1926, California Title 19, "Public Safety", California Title 8, "General Industry Safety Orders", and 41 CFR, Subpart B, "Public Contracts, General Safety and Health Standards." The Contractor shall also use the “BLM SAFETY AND HEALTH STANDARDS” (The Yellow Book) for reference.

Should the contractor fail to comply with any of these standards and regulations, the contractor shall be found to have defaulted on the terms of the contract.

Contingency Plan:

Sudden or unusual events could result in a negative impact to the delivery / performance of these requirements.

As an aid to properly plan for such events, the Contractor shall prepare and submit for approval a Contingency Plan for each Place of Performance for these requirements.

The Contractor will outline in detail the method(s) that the Contractor shall use in meeting Contract requirements in the following circumstances:

· a natural disaster occurs which impacts upon the Contractor's ability to perform

· a labor strike occurs which impacts upon the Contractor's ability to perform.

· a hazardous materials spill which impacts the Contractor’s ability to perform, or which may affect public safety

· an incident which causes major damage which impacts the Contractor's ability to perform

· other unforeseen circumstances

In all cases, the Contractor will assume that government cannot provide supplemental forces, and continues to need the same or additional performance under the Contract, which the Contractor must meet. This Contingency Plan shall be submitted as a part of the Contractor proposal.

Emergency Response:

Response to emergency service calls outside of the normal business hours shall not exceed four (4) hours regardless of the time during the day or night, weekends or holidays.

Response to emergency service during normal business hours shall not exceed two (2) hours.

Response is defined as having all personnel and equipment required to correct an emergency at the site of the emergency or at a pre-approved staging area, ready, willing, and able to perform the emergency work. The Contractor will provide a draft emergency response plan prior to Contract start date.

Emergency Services:

On occasion, services may be required to support an activation or exercise of contingency plans outside the normal business hours described above. The Contractor's responsibilities for emergency support will be in accordance with the contingency plan.

Hazardous Materials and Hazardous Response:

The Contractor will conform to all Bureau, Federal, State, and local regulations in the use and disposal of hazardous materials and hazardous waste. The Contractor will provide the appropriate response to any emergency involving hazardous materials at any of the facilities covered by this Contract. The Contractor will provide proof/certification of its personnel qualified to work with hazardous materials and wastes to the Bureau. The Contractor will notify the Bureau immediately upon discovering a release of hazardous waste into the environment.

Public contact:

Contractor personnel may encounter adjacent landowners or members of the public during the performance of their work. Contractor personnel will present a professional appearance and be able to provide appropriate identification, including display of proper identification by each employee. All Contractor and subcontractor personnel shall comply with all Federal and State laws related to citizenship. Contractor personnel shall inform any trespassers along the right of way of hazards and, as necessary and appropriate, ask trespassers to leave fenced off or restricted areas. If Contractor personnel may encounter emergency personnel, policemen, or firemen along the right of way, the Contractor personnel shall notify the On-Site Foreman If Contractor personnel encounter the news media, they should refer all questions to the On-Site Foreman, who shall keep the COR informed of all news media contacts.

Government Observations:

Government personnel other than COR may from time to time observe, photograph, or otherwise record Contract operations. However, these personnel will not interfere with Contractor performance.

Regular Work Hours:

The performance period established for this contract is based upon all work being conducted during regular working hours between 8:00am and 4:30pm, Monday through Friday, excluding government holidays. If the Contractor desires to carry on work outside regular hours, including Saturdays, Sundays, and government holidays, a request must be submitted to the COR in sufficient time to allow satisfactory arrangements to be made for access to the work site.

Communications:

“Time” for communications received after 3:00pm, after 12:00 pm locally on Fridays, or after 12:00 pm locally prior to a holiday will not start until the next business day. All times are local Pacific Standard Time.

Federal Holidays:

The following Federal Legal Holidays are observed:

Fire Danger Season:

If the Contracting Officer Representative (COR) allows the Contractor to continue work during periods of declared fire danger or season, the Contractor shall comply with all applicable state laws relating to fire prevention and with all special conditions of work as directed by the COR.

Drawings:

Typical Drawings: Any drawings titled typical are general only and dimensions of each structure will be fixed by the Contracting Officer to adapt the design to existing conditions at the structure location.

Reduced Size Drawings: Any drawings identified as "REDUCED SIZE DRAWINGS" are photographically reduced in size. Accordingly, measurements and dimensions should not be taken or be based on any numerical scales shown. Prospective bidders desiring to review a copy of the full-size drawings may contact the Contracting Officer identified in the solicitation.

Preservation of Historical and Archeological Data:

The Historic and Archeological Data Preservation Act of 1974 provides for the preservation of historical and archeological data that might otherwise be lost as the result of alterations to the terrain caused by a federal or federally licensed activity or program.

If, in connection with operations under this contract, the Contractor, subcontractors, or the employees of any of them, discovers, encounters or becomes aware of any possible historical or archeological data, objects or sites of cultural value on the project area, such as historical ruins, graves or grave markers, fossils, or artifacts, the Contractor shall immediately suspend all operations in the vicinity of the cultural value and shall notify the Contracting Officer in writing, giving the location and nature of the findings. No objects of cultural resource value may be removed.

Where appropriate by reason of discovery, the Contracting Officer may order delays in the time of performance and/or changes in the work. If such delays and/or changes are ordered, the time of performance and contract price shall be adjusted in accordance with the Changes clause.

The Contractor will be responsible for protecting the cultural resources within the affected area from damage. In addition, the contractor will be liable for all damage to the identified cultural resources caused by their actions or the actions of their agents or representatives. The Contractor shall immediately notify the Contracting Officer or his representative if any damage occurs to any cultural resource and immediately suspend work in the area in which damage has occurred until authorized to proceed.

Cleanup The construction site shall be kept clean and free of debris at all times. Proper disposal of the old equipment is required. Upon completion of the project, Contractor shall remove all unused material, trash, and debris resulting from the work to the satisfaction of the COR.

SOW 8.0 Technical Exhibits and Definitions

Standard Definitions:

Physical Condition The Physical appearance of Federal equipment or facilities that considers cracks, chips, dents, abrasions, rust, corrosion, general cleanliness, vibration, operating temperature, and discoloration and other items as identified by the COR. Physical condition may be determined by visual as well as diagnostic means.

Contracting Officer (CO) The Secretary of the Interior or designated authorized representative who is the only agent capable of signing a federal award or obligating funds.

Contracting Officer’s Representative (COR) The Contracting Officer’s designated representative as indicated in a delegation of authority letter.

Quality Assurance (QA) Surveillance of Contractor performance to determine performance requirements are met.

Performance Requirements Summary (PRS) (see Technical Exhibit below) The PRS identifies the key performance indicators of the Contract that will be evaluated by the Government to assure Contract performance standards are met by the Contractor.

Quality Control Those actions taken by the Contractor to control the production of goods or services so that they meet the requirements of the performance work statement.

Technical Exhibits:

EX 1: NRCS Conservation Practice Specification – 642 Water Well EX 2: Kern County Well Abandonment Requirements EX 3: Performance Requirements Summary

EXHIBIT 1: NRCS Water Well Specifications

NATURAL RESOURCES CONSERVATION SERVICE

CONSERVATION PRACTICE SPECIFICATION

642 – WATER WELL

I. SCOPE

Work shall consist of furnishing all equipment, materials, tools, labor and transportation, and in performing all operations in connection with the satisfactory construction, development, disinfection, and testing of the well.

The extent of the work is described with the understanding that the exact conditions of the subsurface are not known prior to commencement of the work.

II. LICENSING AND PERMITS

The final well completion shall be designed and installed by a licensed C-57 water well drilling contractor, except where exempted by law. Work shall meet the requirements set forth by the local regulating agency, which themselves equal or exceed those listed in the California State Water Well Standards (https://water.ca.gov/Programs/Groundwater-Management/Wells/Well-Standards/Combined-Well-Standards). The contractor shall obtain a well drilling permit from the local regulating agency prior to commencement of the work.

III. SITE PREPARATION

The area immediately surrounding the well site shall be cleared, smoothed, and graded to allow for a safe and dry working area.

IV. CASING MATERIALS

All casing materials shall meet or exceed requirements set forth by the local enforcing agency.

All well casing pipe and couplings shall be homogeneous throughout and shall be free from visible cracks, holes, foreign materials, or other injurious defects. The well casing pipe and couplings shall be as uniform in color, density, and other physical properties as is commercially possible.

The well casing pipe shall be marked according to the ASTM specification for the material used.

Steel Steel pipe used for well casing shall meet or exceed requirements specified in ASTM A589.

The maximum differential head[footnoteRef:1] and nominal size shall be used to determine the minimum thickness for the steel water well casing, as shown in Table 1. A thinner casing may be used if it is determined that it will not collapse, based on analysis using the Timoshenko Elastic Formula and guidelines set forth in NRCS National Engineering Handbook (NEH) Part 631, Chapter 32 (http://directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=26985.wba). Thicker casing shall be used where corrosive conditions are expected. [1: Maximum differential head equals the maximum difference in static head between the inside and outside of the casing. The static head may be determined by either (1) subtracting the elevation of the bottom of the casing from the elevation of the water table, or (2) subtracting the elevation of the depth of maximum allowable drawdown from the elevation of the water table.]

Only new steel pipe casings shall be used in driven wells.

Thermoplastic Thermoplastic pipe used for well casing may be made of acrylonitrile-butadiene-styrene (ABS) or polyvinyl chloride (PVC) and shall meet or exceed requirements specified in ASTM F480.

Used casing and casing with obvious eccentricity or other defects shall not be used.

The material type and the SDR marked on the pipe shall be used to determine maximum allowable depth, as shown in Table 2. Higher SDR-rated pipe may be used if it is determined that it will not collapse, based on a site-specific determination of the maximum differential head using Clinedinst Equation as documented in NRCS National Engineering Handbook (NEH) Part 631, Chapter 32, and ASTM F480.

In known geothermal areas, the maximum allowable depth for thermoplastic pipe shall be reduced by a percentage determined using Figure 1.

Fiberglass The modulus of elasticity for fiberglass pipe shall be certified for use in determining maximum depth.

Fiberglass casing for wells that provide potable water shall be NSF approved.

RTRP. Glass-fiber-reinforced-thermosetting-resin pipe (RTRP) used for well casing shall meet or exceed requirements specified in ASTM D2996. Tests for long-term cyclic pressure strength, long-term static pressure strength, and short-term rupture strength as required in ASTM D2996 are not needed.

RPMP. Reinforced plastic mortar pipe (RPMP) used for well casing shall meet or exceed requirements specified in ASTM D3517. The casing size and depth shall be used to determine the minimum thickness for the RPMP water well casing, as shown in Table 3. Thinner casing may be used if an evaluation using manufacturer’s data documents that it will not collapse given the geologic, hydraulic, and construction conditions at the site.

Concrete Concrete well casings shall be reinforced and shall meet or exceed the requirements of ASTM C76. The minimum 28-day compressive strength shall be 4,000 lbs./in2.

Joints Joints for well casing shall have adequate strength to carry the load due to the casing length and still be watertight or shall be mechanically supported during the installation process to maintain joint integrity. Such mechanically supported casings shall terminate on firm material that can adequately support the casing.

Couplings used with plastic well casing may be solvent–welded or threaded and shall have a strength equal to or greater than the pipe to which they are attached. Couplings shall be made of a material compatible with the casing and recommended for use by the casing manufacturer. If they are made of material susceptible to corrosion, provisions must be made to protect them. Threaded couplings for SDR pipe shall conform to requirements set forth in ASTM F480.

Solvent cement must meet the requirements of the ASTM specification appropriate for the material used:

ABS D2235, PVC D2564

V. SCREEN AND FILTER PACK MATERIALS

Screen All screen materials shall be homogeneous throughout and shall be free from visible cracks, holes, foreign materials, or other injurious defects.

The length and open area of the screen shall be sufficient to limit entrance velocity of water into the well to less than or equal to 0.1 feet per second. [For most stockwater wells developed in unconfined aquifers, the optimum length of the screen will likely be determined by entrance velocity rather than the thickness of the aquifer.] Screens shall have a minimum length of two feet.

Well screens may be constructed of commercially manufactured screen sections, well points, or field-perforated sections. Perforation by any method is allowable provided proper slot size and entrance velocity limits can be met.

For naturally developed wells in well-graded aquifer material, the screen slots shall be sized so that 60 percent of the aquifer material will pass, and 40 percent will be retained (D60). The D50 size is acceptable if the water is highly corrosive, or if there is doubt about the reliability of the sample. The screen openings for poorly-graded aquifer material (relatively uniform size) shall be slightly smaller than the average diameter of the aquifer material.

In wells using a gravel packed envelope, the screen openings shall be sized to retain 90 percent of the gravel pack material.

Filter Pack Filter packs shall be installed in wells if at least one of the following conditions applies:

(1) the aquifer is poorly graded; or

(2) the aquifer is highly variable, containing alternating sand and clay layers; or

(3) the aquifer is poorly cemented; or

(4) maximum yield is required from a marginal aquifer; or

(5) the well is drilled using reverse circulation equipment.

In conditions 1, 2, and 3 above, the need for a filter pack shall be determined by collecting representative samples of aquifer materials and developing cumulative particle size distribution plots based on sieve analyses according to ASTM D2487. An artificial filter pack is required if the uniformity coefficient, Cu, of aquifer material[footnoteRef:2] is less than or equal to 2.0, or if there are no particles coarser than 0.5 mm (medium sand range) at any Cu value. [2: Cu is the ratio of the 60 percent finer material (D60) to the 10 percent finer material (D10).]

The filter pack shall be at least 2 inches thick and consist of sand to gravel size material having a D30 grain size 4 to 10 times the D30 grain size of the aquifer material.

The filter pack materials shall be washed and screened and disinfected with a solution of at least 50 mg/L chlorine. They shall consist of at least 95 percent rounded, dense, siliceous materials with less than 5 percent flat particles (such as mica), earthy or soft materials (such as clay, shale, or anhydrite), or highly soluble limestone or gypsum.

Pre-packed Well Screens Commercial pre-packed well screens may be substituted for a conventionally installed filter pack if at least one of the following conditions applies:

(1) heaving or caving sands are present; or

(2) the aquifer is silty or fine-grained; or

(3) the well is horizontal or angled; or

(4) appropriate materials are not available for a conventional filter pack.

Pre-packed well screens shall consist of an inner and outer screen which are completely filled with uniform, well-rounded, pre-washed grains of silica sand of a specified gradation. The screen slot size shall be based on a sieve analysis of the water-bearing aquifer materials; the slot size shall retain 100 percent of the filter pack’s minimum-sized designation. No minimum annular space is required for a pre-packed well screen if its outside diameter is equal to or less than the casing to which it is attached.

Table 1. Minimum thickness for steel water well casings

Short Canyon Well Replacement and Abandonment SOW | 2

Nominal Casing Size (inches)

4.500 5.563 6.625 8.625 10.75 12.75 14.00 16.00

Max differential head (feet)

Thickness in U.S. Standard Gauge*

Thickness in inches

* 18 Ga = 0.048 in.; 16 Ga = 0.060 in.; 14 Ga = 0.075 in.;

12 Ga = 0.105 in.; 10 Ga = 0.135 in.; 8 Ga = 0.164 in.

Table 2 values are taken from Table 32-8 of NRCS NEH Part 631, Chapter 32, Well Design and Spring Development (http://directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=26985.wba).

Table 1 values are based on information from two sources: 1) Suggested minimum thickness for steel water well casing in Roscoe Moss Company’s “A Guide to Water Well Casing and Screen Selection” (http://www.roscoemoss.com/tech_manuals/gwwc/p11.html); and 2) Differential head limitations for selected sizes of ASTM A-139 Grade B carbon steel casings listed in Table 32-5 of NRCS NEH Part 631, Chapter 32, Well Design and Spring Development (http://directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=26985.wba).

Table 2. Maximum differential head of casing for thermoplastic pipe.

Reference: National Engineering Handbook (NEH) Part 631, Chapter 32, Well Design and Spring Development (http://directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=26985.wba ). Maximum SDR values are calculated using the Clinedinst equation, assuming Poisson’s ratio = 0.38, and using the highest value listed for the range of maximum differential head.

Figure 1. PVC Temperature Service Factor for PVC Casing Source: NRCS-MT Construction Specification MT-642

Percent reduction in maximum allowable differential head for PVC casing in geothermal areas

Table 3. Minimum wall thickness (inches) for reinforced plastic mortar (RPMP) water well casings

0.23 0.29 0.17 0.17 0.19 0.22 0.25 0.28 0.34 0.34 0.36 0.23 0.28 0.34 0.40 0.46 0.36 0.43 0.46 0.46 0.33 0.41 0.46 0.46 0.46 10-60 61-200 201-300 301-500 501-750 Casing Diameter (inches) 0.23 0.29 0.17 0.17 0.19 0.22 0.25 0.28 0.34 0.34 0.36 0.23 0.28 0.34 0.40 0.46 0.36 0.43 0.46 0.46 0.33 0.41 0.46 0.46 0.46 10-60 61-200 201-300 301-500 501-750 Max.

Differential Head (ft)

Max.

Differential Head (ft)

Short Canyon Well Replacement and Abandonment SOW | 2

VI. INSTALLATION

Construction operations shall be done in such a manner that erosion and air and water pollution are minimized and held within legal limits. All work and operations shall be conducted in accordance with proper safety codes for the type of construction being performed, and with due regards to the safety of all persons and property.

The completed job shall be workmanlike and present a good appearance.

Drilling Only clean, potable water shall be used in drilling fluid, whether employed alone or in combination with drilling additives. If organic drilling fluids are used, they must be broken down chemically according to the manufacturer’s recommendations before or during development.

Lead- and mercury-bearing materials shall be strictly prohibited from the wellhead area during construction.

Whenever there is an interruption of work on the well (e.g., overnight shutdown, inclement weather), the well opening shall be closed and secured with a cover designed to ensure public safety, prevent damage to the well, and prevent introduction of unwanted materials into the well. The contractor shall be responsible for any objectionable material that may fall into the well and the effect it may have on water quality, until completion and acceptance of the work by the Government.

Alignment. Drilled wells shall be round, plumb, and aligned so as to permit satisfactory installation and operation of a pump of the proposed size and type to the greatest anticipated depth of setting.

Casing All wells shall be cased to a sufficient height above the ground surface to prevent the entry of surface and near surface water. The height of the casing above the ground surface shall not be less than one foot.

In consolidated formations, the casing shall extend through the overburden material to an elevation at least 2 feet into consolidated materials.

In unconsolidated formations, the casing shall extend to the screen.

Joining To prevent galvanic corrosion, dissimilar metals shall not be joined.

Screen and Filter Pack Filter pack materials shall be delivered to the well site on approval of the purchaser. Materials shall be protected from the weather and contamination until installed. Materials that come in contact with the ground shall not be used.

Telescoped screen assemblies shall be provided with one or more sand-tight seals between the top of the telescoped screen assembly and casing.

Where practical, the top elevation of the screen should be below the lowest water level expected during pumping and be located opposite the most permeable areas in water-bearing strata.

Centralizers. Provisions shall be made for centering the casing in the filter pack. Centralizers shall be installed if casing and/or screen assemblies over 40 feet long are installed in drill holes having nominal diameters 2 inches or larger than the outside diameter of the casing.

To prevent galvanic corrosion, metallic guides shall be of the same alloy as the casing or screen assembly to which they are attached. Metallic guides shall not be directly welded to the screen, but rather on short sections of blank casing that can be inserted into the well at the desired interval.

Filter Pack. Where a filter pack is to be installed, the diameter of the drilled hole shall provide for adequate annular space to permit the passage of the tremie pipe(s), including couplings.

Filter pack material shall be placed with a tremie pipe from the bottom up in such a manner as to prevent segregation, bridging, or inclusion of excess material from the borehole sidewalls. The inside diameter of the tremie pipe shall be at least 12 times the diameter of the coarsest pack material if placed by gravity, and at least 10 times if pumped. The top of the tremie pipe shall be fitted with funnel fittings so the filter pack can be shoveled or dumped into the tremie.

Clean water may be mixed with the filter pack to facilitate placement. The filter pack shall be placed so that the actual volume used can be calculated to within 10 percent.

Filter pack material shall extend a minimum of 20 feet above the top of the highest screened or perforated section and shall extend through the entire length of the water-bearing formation penetrated by the well.

Sealing and Grouting A positive seal (grouted in place) or packer shall be provided between the casing and the less pervious material overlying the aquifer of artesian wells. A similar positive seal shall be provided to separate water-bearing units where co-mingling of waters is undesirable. The seal shall extend above and below the strata no less than 10 feet even should the confining formation be less than 10 feet in thickness.

A transition seal consisting of a 2-foot length of fine-grained sand shall be placed between the filter pack and the neat cement.

A packer or similar retaining device, or a small quantity of sealant that is allowed to set, shall be placed at the bottom of the interval to be sealed before final sealing operations begin.

The annulus surrounding the permanent well casing at the upper terminus of the well shall be filled with expansive hydraulic cement (ASTM C845), shrinkage-compensating concrete, bentonite-based grout, clay, or other material with similar sealing properties. Cuttings from drilling or drilling mud shall not be used for any part of the sealing material.

Dry additives should be mixed with dry cement before adding water to the mixture to ensure proper mixing, uniformity of hydration, and an effective and homogeneous seal. The water demand of additives shall be taken into account when water is added to the mix.

California Water Well Standards require that the grout seal extends at least 20 feet deep in agricultural and individual domestic wells. Exceptions to minimum seal depths can be made for shallow wells at the approval of the Government, where the water to be produced is at a depth less than 20 feet. In no case shall an annular seal extend to a total depth less than 10 feet below land surface. County and local requirements may be more restrictive.

The casing shall be surrounded at the ground surface by a 4-inch-thick concrete slab extending at least 2 feet in all directions. The upper surface of the base shall slope away from the well casing. Contacts between the base and the annular seal, and the base and the casing, shall be watertight and shall not cause the failure of the annular seal or the well casing.

VII. APPURTENANCES

Sanitary well seal. On completion, the well shall be provided with a suitable threaded, flanged, or welded cap or compression seal to prevent entry of contaminants into the well.

Air release valves shall be placed in the well system to provide a positive means for air escape or air entrance as specified by the Engineer Access Port. An access port with a minimum diameter of 0.5 inch shall be installed to allow for unobstructed measurement of depth of the water surface, or shut-in pressure of a flowing well. Access ports and pressure gages or other openings in the cover shall be sealed or capped. Removable caps are acceptable as access ports.

VIII. DEVELOPMENT

Wells to be completed without a filter pack in unconsolidated granular aquifers shall be developed following guidelines set forth in ASTM D5521. The method shall be selected based on the geologic character of the aquifer, type of drilling rig, and type of screen.

The well shall be developed at a continuous discharge rate of up to 120 percent of the anticipated normal production rate, until it has stopped producing detrimental quantities of solid particles and when the predetermined fraction of the filter pack has been removed.

The discharge at particular rates may be held constant for as long as 2 hours. The test pump shall have neither a check nor foot valve, so that backwashing occurs when the power is shut off. Any sand damage to the pump is the responsibility of the contractor.

After aquifer development is complete, the accumulated sediment shall be removed from the bottom of the well bore by pumping or bailing.

IX. DISINFECTION

The well shall be disinfected immediately following construction, following guidelines set forth in Appendix C of the California State Well Standards (https://water.ca.gov/Programs/Groundwater-Management/Wells/Well-Standards/Combined-Well-Standards), and in accordance with any additional county or local requirements.

X. TESTING

Water Level and Yield Pumping tests shall be performed to determine aquifer characteristics, and to determine capacity and placement of the permanent pumping equipment. The pump to be permanently installed shall be selected to yield no more than 60-70 percent of the tested capacity of the aquifer.

Water pumped from the well may be discharged onto the surface of the ground adjacent to the well unless:

(1) the aquifer is shallow and unconfined, and the test water may recirculate into the aquifer; or

(2) released water can cause flooding or erosional damage to property or structures at the site; or

(3) the practice is not allowed by the local regulatory agency.

The pumping test shall be run long enough to stabilize drawdown levels at specific field requirements. The duration of the pumping test shall not be less than one hour and shall be at least four hours where nearby wells may be affected, or where the well is to be the sole water source for the intended use. Where nearby wells can provide specific information, the test duration can be minimal.

Water Quality Sampling and testing shall comply with all applicable federal, state and local requirements. These requirements vary according to the water quality parameters associated with the intended use(s) of the water.

XI. REPORTING

A record of the installation of this practice shall be made and shall include the following information:

• Location of the water well by Global Positioning System, latitude/longitude, township/range, or other georeferencing convention, of such precision that it can be readily re-located

• Date of completion of the water well

• Name of landowner

• Name, title, and address of person responsible for the water well

• Total depth of the water well

• Length of casing and screening

• Inside diameter of well bore or casing

• Type of casing material or schedule (e.g., standard weight steel, or PVC sch-80)

• Static water level measured from ground surface

• Water chemistry before and after disinfection This information can be provided using California Department of Water Resources (DWR) Well Completion Report Forms. Completed forms must be submitted to DWR by the drilling contractor in accordance with relevant provisions of Section 13750 through 13754 of the California Water Code. A copy of this report shall be provided by the well contractor to the Government.

XII. ABANDONMENT OF A DRY HOLE

If a dry well is to be permanently abandoned, it shall be completely filled in such a manner that vertical movement of water within the well bore cannot occur. Refer to Conservation Practice Standard 351, Well Decommissioning.

XIII. MEASUREMENT

The amount of well drilling is measured to the nearest foot of well drilled and cased. Wells abandoned for causes other than actions of the contractor will be included in the measurement.

EXHIBIT 2: Kern County Well Abandonment Requirements

Section 5: Well Abandonment and Destruction The Contractor shall execute the complete destruction of the existing non-functioning well (approx. 250 feet deep, 6-inch steel casing) in strict accordance with Kern County Public Health Services Department – Environmental Health Division (EHD) requirements and California Department of Water Resources (DWR) Bulletins 74-81 and 74-90.

5.1 Regulatory Compliance & Permitting

· The Contractor shall obtain a valid Well Destruction Permit from Kern County EHD prior to the commencement of any destruction activities.

· The Contractor shall notify Kern County EHD at least 48 hours prior to sealing operations to allow for site inspection if required.

5.2 Well Preparation

· The Contractor shall remove all pumps, piping, debris, and obstructions from the well casing to the total depth of 250 feet to ensure a continuous seal.

· The Contractor shall sound the well depth to verify it is open to the original bottom. If the well has collapsed or is obstructed, the Contractor shall clean out the well or propose an alternative destruction method (e.g., over-drilling) for Government approval.

5.3 Sealing Material & Placement

· The well shall be filled from the bottom up using an approved sealing material, typically Neat Cement (Class A or B Portland cement mixed with not more than six (6) gallons of water per 94-lb sack) or High-Solids Bentonite Grout.

· Placement Method: Sealing material shall be placed via a tremie pipe or equivalent pressure-grouting method to prevent bridging, segregation, or dilution of the material. "Free-fall" pouring of sealing material is strictly prohibited unless explicitly authorized in writing by the Kern County EHD for shallow intervals.

5.4 Surface Termination

· The steel casing shall be cut off at a minimum of five (5) feet below existing ground surface (bgs).

· The resulting excavation above the cutoff casing shall be backfilled with native soil, compacted to match the surrounding grade, and contoured to prevent water ponding.

5.5 Reporting

· The Contractor shall submit a Well Completion Report (DWR Form 188) indicating "Destruction" to the California DWR and Kern County EHD within 60 days of project completion.

· A copy of this report shall be provided to the Government Project Manager as a final deliverable.

Short Canyon Well Replacement and Abandonment SOW | 15

EXHIBIT 3: Performance Requirements Summary (PRS)

Task(s) 1-4 Obtain permits, drill well, conduct appropriate tests, and abandon existing well.

Coordinate schedules of each task with the Government’s Representative.

Well is drilled and developed as outlined in the SOW. Well produces expected amount of water. Old well is safely abandoned. All work is adequately scheduled with the Government’s Representative and completed within the Period of Performance.

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