Geothermal.pdf

Ft. Benning Geothermal Evaluation Requirements Overview:

Based on Ft. Benning’s past successes with conventional closed-loop Geothermal Heat Pump (GHP) systems, “hybrid” closed-loop GHP system and its state-of-the-art, open-loop, Aquifer Thermal Energy

Storage (ATES) system, additional GHP systems are being considered for this Garrison. Accordingly, under this Solicitation, investigations are proposed to determine the suitability of these various

“architectures” of GHP systems at several locations at Ft. Benning. These tests are likely to be conducted at the “Main Post” area (or at least south of the Upatoi Creek for the hydro-geological investigation), but the government can select any location on the installation that is easily accessible to a drill rig and the other equipment needed to construct and conduct the test and investigation specified herein. These other areas include, but are not limited to, Sand Hill, Kelly Hill, Harmony Church, and Custer Road areas in

Georgia and the Uchee Creek Campground & Marina in Alabama.

Qualifications:

Contractor qualifications and experience that will be considered in the ranking and selection of the offer are as follows:

Does the Contractor have experience, in geological formations such as those found at Ft.

Benning, in the engineering of traditional closed-loop geothermal systems, hybrid closed loop geothermal systems, and also more advanced architectures of geothermal systems like ATES or its closed-loop counterpart known as Borehole Thermal Energy Storage (BTES)?

Does the Contractor have a Georgia-licensed Professional Engineer (PE) on staff that will supervise the work performed under this contract? Does the Contractor, or one of its sub-contractors have Georgia-licensed Professional Geologist (PG) that will assist in the preparation of the evaluations performed under this contract?

Does the Contractor have the capability to perform traditional in-situ Thermal Conductivity

Testing (TCTs) in-house? Does the Contractor have the capability to perform advanced, layer-by-layer Thermal Conductivity Testing (LTCTs) in-house? Will all field work associated with the TCT or LTCT be performed by graduate engineers; NEBB certified Testing/Adjusting/

Balancing (TAB) and/or Commissioning (CxA) Technicians or Certified Professionals (CP);

IGSHPA Certified Geoexchange Designers (CGD); or a Georgia Professional Engineer (PE)?

Will all work and analysis associated with the TCT/LTCT be done under the supervision of a

Georgia PE and a CGD? Ft. Benning desires to understand the thermal properties (“k”) of its underlying geology on a layer-by-layer basis and so a LTCT is specified in this solicitation.

LTCTs required the use of down-hole fiber optic (FO) cable and the use of a Distributed

Temperature System (DTS) laser and computer to determine the temperatures along the FO cable.

Does the Contractor has experience in the use of DTS systems for LTCTs or utilized in a permanent (or temporary) in-situ temperature monitoring system?

Will all drilling activities performed by the Contractor or their sub-contractors be accomplished by a water well driller that is licensed by the Georgia Department of Environmental Protection

(GA EPD)? Will all wells or boreholes installed under this contract shall be constructed in accordance with the requirements set forth by the GA EPD?

Geo Investigation Narrative

Will the sub-contracted laboratory used for the water testing be licensed by the GA EPD for testing of the enumerated substances in the solicitation?

Has the Contractor ever prepared a Class V Underground Injection Control (UIC) permit application for a client and if yes, has the Contractor succeeded at obtaining said permit?

Does the Contractor meet the following minimum experience requirements?

o Has the Contractor engineered a minimum of ten (10) traditional closed-loop or open-loop geothermal systems?

o Has the Contractor ever engineered an ATES system? Has the Contractor ever engineered a BTES system?

o Has the Contractor performed a minimum of 10 TCT or LTCT analysis and report?

o Has the Contractor been in business for a minimum of 5 years?

o Has the Contractor completed a minimum of ten (10) water sampling procedures with the corresponding water samples sent to a GA-EPD approved laboratory for testing?

o Has the Contractor ever performed geophysical logging and prepared electric logs (e-logs) or natural gamma radiation logs of a well or borehole?

o Has the Contractor or a sub-contractor ever performed an aquifer pumping test to determine the hydro-geological properties (e.g. hydraulic conductivity, storativity, etc.) of an aquifer?

o Has the Contractor ever performed investigation and analysis of the chemical properties of groundwater for the purpose of identifying the likelihood of injection well clogging due to mechanical, chemical or biological fouling? Specifically, has the Contractor performed or analyzed field or laboratory data associated with oxic/anoxic conditions, levels of Fe2+, Fe2++, sand level in ppb, fine particulate via a Membrane Filter Index

(MFI) test or associated chemical testing to determine the probability of success injection performance?

Layered Thermal Conductivity Testing Requirements

Introduction: The Contractor is required to perform a total of two, in-situ Layered Thermal Conductivity

Tests (LTCTs), at locations selected by the Government. LTCTs are sometimes referred to as a

Distributed Thermal Response Test (DTRT), because they utilize fiber optic cable based Distributed

Temperature Sensing (DTS) equipment and temperature sensing fiber optic cable installed in-situ to the underground geology. For purposes of this Contract, these type test will simply be referred to as LTCTs.

The LTCTs shall be conducted using the protocols, procedures and materials listed herein. The depth of each of the two LTCTs shall be 500’ or until bedrock is reached, whichever comes first. If a depth of at least 375’ is not reached prior to reaching bedrock, contact the Contracting Officer (CO or COR) for further instructions before terminating drilling operations and proceeding with the LTCT.

These tests are intended to provide at least three geological, layer-by-layer, properties of the underground formation at representative project sites. These properties are the thermal conductivity (“k”), the thermal diffusivity (“α” or “alpha”) and the undisturbed deep earth temperature (“DET”) of the geology and the

Borehole Thermal Resistance (BTR) of the borehole/U-bend itself. These properties are critical to the proper engineering, sizing and modeling of the either traditional Ground Loop Heat Exchangers (GHX) normally utilized by Geothermal Heat Pumps (GHP) systems (sometimes referred to as Geo-Exchange or

Ground Source Heat Pump systems) or the more state-of-the-art Borehole Thermal Energy Storage

(BTES) architecture that DoD has implemented elsewhere. It is also required that the Government receive detailed records of the geology encountered during the drilling of the LTCT boreholes.

LTCT Procedures: While some aspects of the LTCT shall be conducted generally as outlined in

Chapter 34 of the American Society of Heating, Refrigeration and Air Conditioning (ASHRAE) HVAC

Applications Handbook, 2015 Edition, and those requirements are superseded by the requirements listed herein:

The total duration of the TCT (when the heating elements are energized) shall be for a minimum of 48 hours.

Heat shall be applied to the borehole U-tube/underground formation at an average rate of 15-25 watts per ft. of bore (141 to 234 ft of bore/U-tube per ton).

ASHRAE recommends a maximum standard deviation of +/-1.5% of the input power from the average power level and peak variations be kept to less than 10% of the average power level OR the resulting temperature variation of the actual average loop temperature, from that predicted by a linear regression analysis of temperature vs. the natural logarithm of time, be held to less than

+/- 0.5°F. LTCTs accomplished under this Contract shall comply with both specifications, not just either specification. Alternately, the Contractor may utilize the temporal superposition of the variation or steps in the power fluctuations experienced during the LTCT to account for any various in power consumption that exceed the above specifications

Temperature measurement/recording accuracy for conventional temperature probes and data loggers shall have a combined accuracy of +/-0.5°F or better. DTS equipment shall have a temperature resolution of +/- 0.3°F or better based on a sampling interval of 1 minute and +/-

0.1°F resolution better based on a sampling interval of 5 minute Power transducer/recorder accuracy shall be +/-2% or better. ASHRAE recommends pumping sufficient flow to obtain a temperature differential of the “actual heat pump system” and mentions the range of 6-12°F. The heated U-bend, functioning as “line source” of heat energy, more closely represents this geometry

(line source) with higher flow rates and resultant lower delta T’s. Accordingly, the LTCTs accomplished under this Contract shall be run at higher flow rates with resultant 2- 8°F temperature differential maintained between the inlet and outlet water to the LTCT equipment.

Provide a minimum 5 day waiting period after drilling for anticipated k<1.0 formations and a minimum 3 days waiting period for k>1.0 formations before conducting the TCT. Unless directed otherwise by the Government due to time constraints, test performed under this Contract will be conducted within these waiting period limitations.

Undisturbed Deep Earth Temperatures (DET) shall be determined by the direct temperature recording of the underground undisturbed formation temperature via submersible data-logging/temperature probe insertion into the liquid filled u-bend after the above waiting period and before the actual TCT has been attempted and via the installed DTS cable. The data logger/temperature probe shall be lowered on a steel cable down the interior of the u-bend in 50’ steps, then remaining at each depth sufficient time (based on its stated response time) to record at least 30 data points recorded at each 50’ incremental depth. Contractor shall average the data recorded at each of the multiple depths (50’ below grade down to then down to the u-bend’s deepest depth, on 50’ intervals) and report each increments temperature as well as the overall average of the underground temperatures. The data logger/temperature probe shall be inserted into the u-bend and lowered to the bottom of the U-bend then raised to the surface in 50’ increments, with the last recording taken at 50’ below grade and the complete temperature profile shall be provided to the Client. The Contractor shall also provide a nearly continuous (maximum

10’ interval) deep earth temperature profile from the surface to near the bottom of the U-bend by providing the temperature profile recorded by the fiber optic DTS cable prior to the startup of the

LTCT.

During the LTCT, data collection of all non-DTS parameters shall be collected on maximum two-minute intervals. Due to accuracy improvements of the temperature measurements taken by the

DTS equipment as the sampling interval increases, evaluation and sampling of the data may be 5-minute intervals.

Above ground piping associated with the TCT testing apparatus shall be insulated with a closed cell insulation with a minimum R3 value and the compartment in the test rig shall also be insulated with a closed cell insulation having a minimum R-value of 10.

If “re-testing” is required due to anomalies or failures during the initial testing, the protocols in the ASHRAE Applications Handbook shall be followed or the Contractor may utilize

Thermal Diffusivity Analysis (“α” or “alpha”) Analysis: Contractor shall utilize a Professional

Geologist (PG) to classify the “cuttings” brought up from depth on maximum 20’ intervals, provide a geologist description of these cuttings and then the Contractor shall calculate a weighted average of the overall formation “alpha” based on looked up values of thermally conductive (k) weighted, but estimated. alpha values of the strata.

DTS System: The Contractor shall utilize a Distributed Temperature System (DTS) capable of the resolution previously specified. DTS fiber optic cable, suitable for immersion in pressurized water shall be placed inside at least one “shank” of the u-bend and utilized to measure the temperature of the water every 10 ft. or less down that shank of the u-bend so that highly granular data of the underground geology can be determined. K-values of the geology shall be reported on maximum 10’ intervals and the bulk or composite k value of the geology shall be reported for future GHXs that are designed for U-bends between 100’ deep up to the termination of the boring on 50’ intervals (e.g. k values of the formation experienced by borehole/U-bends of 100’, 150’, 200’, 250’, etc. depths).

Permitting: Contractor is required to obtain any State or US Army permits needed to conduct this testing. Contractor is required to assist with the preparation of, and obtain a Record of

Environmental Compliance (REC), otherwise known as a Form 144R prior to beginning any field work. Contractor is required to obtain a “Dig Permit” from Ft. Benning and the “Georgia 811” underground utility location service.

Quality Assurance & TCT Scope: To ensure that the Government receives the highest quality level of in-situ formation thermal conductivity testing and data analysis, the Contractor shall adhere to the following practices:

Contractor, their sub-contractors and affiliates shall own, maintain and calibrate the LTCT and conventional TCT testing apparatus. Within one week of utilizing the power generator and heating system in the field, Contractor shall startup and operate the power generation equipment and heating system under simulated conditions to insure it is functioning properly before it is deployed at Ft. Benning. Contractor shall provide documentation that the personnel conducting and/or analyzing the LTCT data has experience with DTS equipment and conducting DTS based

LTCTs.

Contractor shall utilize thermally enhanced bentonite grout (minimum k-value of 1.0) for each borehole, installed via tremie tube from the bottom to the top of the borehole. Bentonite grout shall comply with NSF/ANSI Standard 60-2005 and shall have a maximum hydraulic conductivity of 1 X 10 -7 cm/sec. 1-1/4” SDR-11, PE 4710 HDPE piping with a factory fusion welded u-bend shall be installed in the borehole with a minimum of 5’ of excess pipe extended above the adjacent grade and left for testing and future connections unless directed otherwise.

Contractor shall provide the temporary use of, and fuel for, a minimum 25 kW on-site diesel generator to power the LTCT test apparatus for the duration of the test. Contractor may not use power taken from the grid.

The Layered Thermal Conductivity Test (LTCT) Report shall include, but not be limited to:

a. Thermal Conductivity of formation, layer-by-layer and bulk/composite values for various proposed depths of future boreholes starting at 200’ deep and continuing in 50’ intervals down to the termination of the boring

b. Deep Earth Temperature overall, and by depth as specified

c. Estimated Thermal Diffusivity based on the geological logs and the sampling intervals specified

d. General log of geologic formation encountered during drilling procedures

e. Complete description of the drilling conditions including drilling rate (ft/hour), drilling fluids utilized, drilling issues/conditions, etc.

f. Layer-by-layer (10’ maximum intervals of depth) temperatures of the formation (due to dissipation of the introduced heat) for at least 48 hours after the termination of the active heating of the formation

Field work shall be performed by graduate engineers; NEBB certified

Testing/Adjusting/Balancing (TAB) and/or Commissioning (CxA) Technician or Certified

Professional (CP); IGSHPA Certified Geoexchange Designer (CGD); or a Professional Engineer

(PE) registered in the State of Georgia. All work shall be done under the supervision of a PE and a CGD.

The analysis of the field data and the preparation of the LTCT report shall be done under the supervision of an IGSHPA CGD and a Registered Professional Engineer (PE).

An initial linear regression analysis shall be utilized on the appropriate data sets to insure the previous standards are met in regards to power consistency and temperature vs. ln(time) “slope” quality. In addition, the “correlation coefficient” (R2) of the slope line determined during the analysis shall fit the actual natural log of time vs. temperature such that its value exceeds 0.95 during the 12-48 hour portion of the test. Unless it can be definitively shown that the low R2

(below 0.95) is due to some natural phenomenon, the Contractor shall rerun the TCT at no cost to the Government. In the next phase of the analysis, temporal superposition of the variation or steps in the power experienced during the LTCT shall be incorporated to minimize the error between the calculated and measured ground temperature response to achieve an equivalent Root

Mean Square Deviation (RMSD) of the temperature vs. time to within 0.1ºK. A more detailed curve fit of the data vs. the simplistic curve fit of a straight line to a temperature vs. natural log of time plot to determine the thermal conductivity “k” shall be provided.

Hydro-geological Investigation Requirements:

Introduction: Ft. Benning is also considering additional “Open Loop” GHP systems. These could be of the traditional extraction and injection design (traditional American open loop design), “pump and dump”

(extraction and release of the water at the surface) or a state-of-the art Aquifer Thermal Energy Storage

(ATES) system, which has been installed in the Sand Hill area of Ft. Benning as a “Demonstration” project under DoD’s ESTCP program. Accordingly, under this Contract, several test wells will be constructed and a series of tests conducted to determine the suitability of aquifer at one location for future open loop systems as described below. All drilling work shall be accomplished by a Georgia Licensed

Water well driller and all wells shall be constructed in accordance with the requirements set for by the

Georgia Department of Environmental Protection (GA EPD).

Scope: Under this project, the Contractor will construct a single production well (Pumping Well) which will aid in the characterization of the aquifer’s hydraulic conductivity, certain geo-physical properties, groundwater level, slope of the aquifer (hydraulic gradient) and the water chemistry of the groundwater.

The Contractor shall also construct two small monitoring wells, as described herein, which will serve similar purposes. Various analysis shall be performed, as specified herein, to characterize the aquifer and help determine its suitability as a potential thermal resource.

Pumping Well and Monitoring Well requirements: Contractor shall first construct a single traditional water well (“pumping well”), 500’ deep, or until bedrock is reached (whichever comes first) and two

“monitoring wells” of the same depth. If a depth of at least 375’ is not reached prior to reaching bedrock, contact the Contracting Officer (CO or COR) for further instructions before terminating drilling operations and proceeding with the LTCT. Provide detailed CAD drawing of the well construction as well as logs of the amount of material (grout, gravel pack, neat cement, etc.) placed downhole.

The pumping well shall be comprised of casing, well screen, “gravel pack”, grout, a concrete slab at the surface, and a locking cap. The diameter of the borehole for the well shall be as required to accommodate the casing/screen and gravel pack, but as a minimum, shall be 11” in diameter. Non-corrosive

“centralizers” shall be provide on maximum 20’ centers to insure the placement of the well screen at the center of the boring. A temporary pump, wiring, portable generator and test equipment shall also be provided to conduct the test specified herein. This pumping well shall be comprised of NSF approved and stamped, minimum nominal 6” (6.9” OD) diameter, SDR-21, ASTM F480, PVC casing (solid pipe) and slotted casing sections at the desired water extraction/injection zones. Exact length of the slotted casing shall be jointly determined by the Government, the Contactor and the hydro-geological information discovered “live” (during drilling), but for purposes of this Contract, the Contractor shall have on site up to 200’ of slotted casing (of multiple and appropriate slot sizes) and 400’ of solid casing, though ultimately, a total of only 500 combined feet (maximum) of solid casing and screen will be required for the pumping well. The slotted section of the well shall be surrounded by NSF approved

“Gravel Pack”, (washed and graded sand of a very specific grain size distribution to prevent the extraction of native sands, while being primarily large enough to not enter the well through the selected slots in the slotted well casing). The minimum thickness of the gravel pack placed in the annulus of the borehole around the centered and slotted well casing shall be 2” thick (as measured radially). In the remaining annulus, above (and in between if applicable) this gravel pack(s), shall be placed, via tremie tube, bentonite grout (similar to that required for the TCT but without the thermal requirements) all the way to the surface. Exceptions to this usage of bentonite grout is the requirement for “neat cement” to be placed in the top 50’ of the annulus (surface to 50’ below grade) and in and 10’ above or below any “confining” layers that are discovered during drilling process and are deemed desirable by the Government to be utilized by this well (and potentially future production wells) as a confining layer atop the traditional open loop GHP well or an ATES well.

The two required monitoring wells shall be constructed in a similar manner as the pumping well except that the nominal diameter of the casing and well screen shall be 2”, the minimum diameter of the borehole shall be 6.5”, and the maximum required total length of the screened interval shall be 100’ but it may be separated into smaller intervals to match the pumping well screen locations. While the monitoring well shall be in proximity to the pumping well (typically within 100’) as they will be used during the aquifer pumping test and to determine the gradient of the native water table), their exact placement will be determined jointly by the Government and the Contractor based on the proposed design of the Aquifer

Pumping Test and other factors. The monitoring wells shall be “developed” in the same manner, and to the same levels of the pumping well specified herein.

Aquifer Pumping Test (APT) Requirements:

The pumping well must first be clean pumped (“developed”) until the sand level is below 10 ppb (“Sand

Test”) and its NTU (turbidity level) is below 10. The Government, at their sole desertion, may choose to witness these Contractor conducted test. In any event, the Contractor shall submit their calculations and test procedures used in conducting these Sand Test and Turbidity test in report form. Subsequently, when the Contractor believes the pumped water is significantly free of suspended clays, he shall advise the

Government of this condition. At that time, the Government shall determine if the water is free of excessive clay particles by means of a Membrane Filter Index (MFI) test to be conducted by the

Government. If the Contractor passes the MFI test, as well as the previous Sand and Turbidity test, the well shall be considered “developed” and Contractor may proceed to the APT. The minimum duration of the steady rate APT shall be 48 continuous hours and the flow rate shall be a nominal 90 GPM as described herein or higher.

To conduct the APT, the Contractor shall provide the following as a minimum:

A NSF approved submersible pump, which properly fits into the constructed well, and is suitable for extracting potable groundwater with a minimum flow of 90 gallons per minute GPM at the anticipated drawdown level and friction encountered (total head) shall be placed in the pumping well. The submersible pump shall be placed immediately above the highest screen level.

Temporary NSF approved drop pipe, from the submersible pump shall be provided as well as temporary hose to discharge the flow to the discharge location approved in the REC (Form

144R).

Water meter (that measures the water amount) data loggers, etc. to constantly monitor the instantaneous and cumulative water flow

Balancing Valve to adjust the water flow to 90 GPM or the anticipated flow rate that would prevent the pump from over-pumping beyond its maximum draw down level during the duration of the test.

Water level Transducers temporarily located in the monitoring wells and the pumping well that will remain submerged during the APT and are accurate to within +/- 0.5’ of head.

Power wiring to the pump, on-site power generation equipment, controls, computers, and all appurtenances needed to conduct the APT

After the APT is complete, along with the monitoring of the pumping well’s recovery back to normal, the

Contactor shall provide a full software based analysis of the aquifer. This analysis shall determine the hydraulic conductivity (k) of the aquifer, the location below grade of the water table, the slope of the water table and the subsequent estimated native horizontal direction and velocity of the aquifer. The estimated storability, transmissivity, specific capacity and nature (surficial, confined, etc.) of the aquifer shall be calculated and discussed in the report.

Water Chemistry Analysis Requirements: Production or sampling pumps and test piping, of inert materials, which shall not interfere with any water chemistry analysis, shall be utilized to sample the ground water for the parameters listed below. Prior to sampling, the pump shall purge the developed wells until the total volume of the well, calculated as the volume of the water in the well and the gravel pack (assuming its porosity is 1.0) is pumped out two complete times (2X Purge). At the end of the 2X

Purge, flow may be reduced to as low as 0.5 GPM and the discharge water, which must not be exposed to air, (a flow cell is required) shall be monitored for its Specific Electrical Conductance (SEC) in S/cm, its

Dissolved Oxygen (DO) in mg/liter, its temperature and its pH. These values shall be recorded in 15 minute intervals for a minimum of 2 hours. When three consecutive readings, each taken at least 1 hour and 15 minutes past the start of monitoring, show the SEC has not varied more than +/-3%, the DO more than +/-0.3mg/L , the temperature not more than +/-0.2C and the pH not more than 0.1 pH units, the groundwater is considered “stable” and samples may now be collected for immediate delivery to the selected lab for the Detailed Water Chemistry Analysis below. During this basic water chemistry testing, the Contractor shall record, in addition to the pH, SEC and DO levels above, the Oxidation Reduction

Potential (ORP), Total Dissolved Solids (TDS), Temperature, and Turbidity (NTUs) of the water.

Detailed water chemistry analysis shall be provided by a GA EPD approved laboratory for the pumping well and shall include the following regulatory and ATES parameters:

1. All Inorganic Metals listed in the GA EPD drinking water standards.

2. All Semi-Volatile Organic Compounds (Semi-VOCs) listed in the GA EPD drinking water standards

3. All Volatile Organic Compounds (VOCs) listed in the GA EPD drinking water standards

4. Beyond the testing above (Metals, Semi-VOCs and VOCs) which are required for regulatory purposes, the water must also be tested in the laboratory for the following chemicals: Fe2+, Fe3+, and Dissolved Oxygen (DO). If a confining clay layer for the expected production aquifer is not discovered during the natural gamma logging previously specified, some of the screened intervals in the monitoring wells above the clay layer may be required to be utilized for the testing of DO at various depths in the geology. In this instance, up to 4 more samples of Fe2+, Fe3+, and

Dissolved Oxygen (DO) shall be collected by the Contractor, at locations directed by the

Government, and analyzed in the laboratory and included in the final report.

All analytical methods, sample containers, sample preservation techniques and sample holding times must be consistent with the techniques and methods listed in 40 CFR 136 and the analytical methods shall use sufficient sensitively in relationship to the regulatory levels for each respective chemical.

Geotechnical and Geophysical Requirements for the Pumping Well: Collect and bag drilling samples of the cuttings from the pumping borehole during drilling operations. Provide on-site live assessment of the drilling cuttings via sieve analysis, (or other methods) to determine the best prospects for obtaining high water flows at minimum drawdown (best estimated “specific capacity” or gpm per ft.

of drawdown) to determine how much, what depth and what slot size to place/construct the well screen.

Concurrently, (at the completion of the boring of the pumping well) but prior to the placement of well casing, screen, gravel pack or grout, provide natural gamma radiation logging down the entire length of the open borehole in order to assist with the qualitative understanding of the sand and clay content along the entire length of the borehole as well as to determine if there are potential confining layers in the strata encounter prior to bedrock. If borehole collapse is encountered, change the drilling mud formulation or provide other modification to the drilling plan to insure gamma logging can be completed from the surface to the bottom of the borehole. Consult with the Government at the completion of the above field analysis and determine the mutually agreeable location depth(s), length(s) and slot size of the well screening and the size of the gravel pack and then proceed with the construction of the well. This data, along with the drilling cutting that are brought to the surface and bagged at 20’ intervals, (and when there is any drastic change in the appearance to the cutting) shall be captured in a drill cuttings log prepared by a Professional Geologist (PG) and included in the comprehensive report. Contractor shall also provide five ASTM compliant sieve analysis/particle distribution size reports (also prepared by a PG) at critical locations along the borehole.

Geotechnical and Geophysical Requirements for the two Monitoring Wells: The data required for the monitoring wells shall be similar to that required for the pumping well except that:

The screened interval(s) (of up to 100’ total length, but possibly broken into multiple shorter segments) of the monitoring wells shall coincide to the locations determined in the field for the pumping well.

Gamma logs can be prepared after the PVC monitoring wells screens, grout, gravel pack and casing have been fully installed (to eliminate the tendency of borehole collapse during geophysical/gamma logging) or raw boreholes in unconsolidated formations

Permitting: Contractor is required to obtain any State or US Army permits needed to conduct this testing.

Contractor is required to assist with the preparation of, and obtain a Record of Environmental Compliance

(REC), otherwise known as a Form 144R prior to beginning any field work for the construction of any wells or for the discharge of any ground water onto the surface or into the storm water drainage system.

Contractor is required to obtain a “Dig Permit” from Ft. Benning and the “Georgia 811” underground utility location service prior to attempting any drilling or digging at Ft. Benning.

Final Report Requirements:

Incorporate all data collected from the two LTCTs and the Hydro-geological investigation that are a part of this Solicitation into a comprehensive GHP Evaluation report. The report shall include overall recommendations if sites/potential buildings nearby the test sites seem best suited for Conventional closed loop GHP systems, GHP systems connected to a BTES, pump-and-dump open loop GHP systems, conventional open loop GHP systems or GHP systems connected to an ATES systems. Include detailed information about the potential for energy savings associated with each system type. Include information about the advantages/disadvantages of considering open-loop GHP systems in general, but also detailed information about the complexities of obtaining Underground Injection Control (UIC) permits in Georgia from the GA EPD for any system involve underground injection. Based on past water wells drilled at Ft.

Benning and past hydro-geological investigations, provide additional information about the anticipated hydrogeological situation over all of Ft. Benning (as it relates to conventional open loop GHP systems and ATES). The report shall also compare the advantages and considerations involved in utilizing standard “hybrid” designs vs. “full” (traditional) closed loop geothermal systems as well as constructing closed loop system with full Borehole Thermal Energy Storage (BTES) as part of their architecture.

Provide discussions related to considering temporary or permanent DTS instrumentation systems in future

ATES or BTES projects installed at Ft. Benning.