AG-8C30-S-10-0001_Package.pdf

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NRCS SOLICITATION AG-8C30-S-10-0001

Santa Cruz Site #1 FWRS Rehabilitation NRCS-NM Revision 2 (12/09)

Geotechnical Investigation Plan

For

Santa Cruz River FWRS Site No. 1 Rehabilitation

Planning Phase-Revision 2

Rio Arriba County New Mexico

NRCS SOLICITATION AG-8C30-S-10-0001

Santa Cruz Site #1 FWRS Rehabilitation

Background

Santa Cruz River FWRS (Floodwater Retention Structure) Site No. 1 was built in 1962 and is located in Rio Arriba County near the town of Chimayo. It consists of a floodwater retention structure, a retaining dike and a detention dike. The drainage area is 5,148 acres. The dam was originally classified as a medium hazard dam and is currently classified as a high hazard dam.

The dam is about 1,032-feet long and 56-feet high with original sediment storage of 418 acre-feet and floodwater storage of 394 acre-feet. The auxiliary spillway is about 600-feet long and cut into a hilltop wit a maximum spillway capacity of 10,000 cfs. The retaining dike is about 14-feet high and 500-feet long., and located on the northern edge of the auxiliary spillway.

The diversion dike is about 14-feet high and 310-feet long, and is located further north.

The dam was built with zones without a gravel chimney drain. There is a foundation drain along the outside toe of the dam embankment.

The rectangular principal spillway riser is 11-foot high with a 30-inch inside diameter reinforced concrete pipe outlet.

Geotechnical Aspects of Current Design A geological investigation of the dam embankment, dikes, auxiliary spillway and borrow area will have to be completed to determine their engineering characteristics. Drill holes with sampling will have to penetrate the embankment along the dam centerline and the foundation to 1.5-2 times the height of the dam.

Since this dam was built, seismic forces on the structure have to be taken into account for embankment stability and seiche effects to bring the dam up to current design criteria. Since this dam is normally dry, seiche effects can be ignored.

Seismic forces on the principal spillway riser need to be considered. The spectral frequency of the force is roughly equivalent to 0.1 sec per story of riser height.

The dam is in a potentially high sediment environment. The last sediment survey was done in 1975. A new sediment survey should be completed to look at the long term average and compare this to the design sediment pool storage.

Geotechnical Investigation-1960 A total of six drill holes and eight test pits were used to investigate the properties of the materials under the dam centerline, principal spillway centerline, auxiliary spillway centerline, and borrow area. The three drill holes along the dam centerline ranged in depth from 34 to 52 feet. The three drill holes along the principal spillway centerline ranged in depth from 10 to 42 feet. Three test pits were dug along the dam centerline to a depth of 10 feet. Three test pits were dug in the borrow area to a depth of 10 feet. The two test pits in the auxiliary spillway area were dug to depths ranging from 22 to 26 feet.

Sixteen soil samples were collected and sent to the USDA-SCS Soil Mechanics Laboratory in Portland, Oregon for testing.

The samples consisted of five auger cuttings, 1 Denison sampler, and 10 disturbed samples. Laboratory testing consisted of six Atterberg Limit tests, fifteen Grain-size distribution tests, nine Water Content and Dry Density tests, one Permeability test and six Triaxial Shear tests.

Proposed Geotechnical Investigation-2009/2010 The purpose of the current geotechnical investigation is to verify the engineering properties of the embankment and foundation materials of the existing dam, auxiliary spillway, retaining dike and diversion dike. In addition, the properties of the sediment in the pool area will tested to see if it is suitable as borrow material.

The drill rig, backhoe, and sampling methods used in the investigation will be in accordance with (IAW) the attached Geotechnical Investigation Specifications in Appendix A. Approximate 1960 and proposed 2009 borehole locations are shown in Table 1. Locations of the proposed 2009 boreholes can be changed at the discretion of the on-site Geologist depending upon observed conditions. Table 1 summarizes the general location and proposed 2009 methodology. Blank drill logs showing the proposed sampling locations are located in Appendix B.

NRCS SOLICITATION AG-8C30-S-10-0001

Santa Cruz Site #1 FWRS Rehabilitation

TABLE 1: Summary of Proposed Drill Hole Locations and Depth

Location Investigation Method

Number of Drill Holes/

Investigation Depth (Ft.)

per Hole

Sampling per hole Est.

Total Feet

Total SPT Total Shelby

Dam Centerline

Drill Hole 3 Lesser of

151.5 or 20’ into bedrock

SPT = 14; Shelby = 4;

Bag = As needed

~ 450 42 12

Auxiliary Spillway Crest

Drill Hole 2 20 SPT = 3; Shelby = 2;

Bag = As needed

40 6 4

Retaining Dike Centerline

Drill Hole 2 40 SPT = 4; Shelby = 2;

Bag = As needed

80 8 4

Diversion Dike Centerline

Drill Hole 2 40 SPT = 4; Shelby = 2;

Bag = As needed

80 8 4

9 ~ 660 64 24

Downstream of Dam

Drill Hole 2 Lesser of

101.5 or 20’ into bedrock

SPT = 9; Shelby = 4;

Bag = As needed

~ 203 18 8

Downstream of Aux. Spillway

Crest

Drill Hole 2 20 SPT = 3; Shelby = 2;

Bag = As needed

40 6 4

Principal Spillway Inlet

Drill Hole 1 26.5 SPT = 5; Shelby = 3;

Bag = As needed

27 5 3

5 ~ 270 29 15 Earth Augering – Estimated Quantity = 653Feet (See Schedule) Undisturbed Sampling – Estimated Quantity = 39 Each (See Schedule)

Proposed Geotechnical Investigation Field Testing-2009 Only Standard Penetration Testing will be performed in the field.

Proposed Geotechnical Investigation Laboratory Testing-2009 Laboratory testing shall be completed by the USDA-NRCS Soil Mechanics Laboratory in Lincoln, NE. The samples shall be shipped or transported there IAW the appropriate ASTM’s.

Undisturbed samples

Dam/dike embankments and Auxiliary Spillway – Grain-size distribution, Atterberg, Moisture/density; Tri-Axial shear (CU-Bar); Permeability.

Principal Spillway Inlet – Grain-size distribution, Atterberg, Moisture/density; Compaction; Permeability.

Downstream of Dam/Dikes and Auxiliary Spillway – Grain-size distribution, Atterberg, Moisture/density; Permeability.

Disturbed samples

Inlets of Dam/dike and Auxiliary Spillway – Grain-size distribution, Atterberg, Moisture/density; Compaction.

Auxiliary Spillway Outlet– Grain-size distribution, Atterberg, Moisture/density; Compaction.

Borrow (Pool) Area – Grain-size distribution, Atterberg, Moisture/density; Compaction.

Proposed Geotechnical Investigation Mitigation Plan-2009 The proposed investigation is devised to stay away from the Principal Spillway Riser and Pipe and irrigation canal. The dam is normally dry so there is no chance of leakage through the embankments. The on-site Geologist will be Robin White.

Proposed Geotechnical Investigation Hole/Pit closure-2009 Drill holes on the embankments and below the dam will be closed with neat cement or a bentonite/cement grout using a tremie tube. All other drill holes/pits will be backfilled with native material.

Appendix A

Geological Investigation Specifications

GEOTECHNICAL INVESTIGATION SPECIFICATION

10. GENERAL INVESTIGATION

1. SCOPE

The work consists of augering or drilling test holes and taking soil samples, as designated by the Government Representative, in order to determine the characteristics and extent of the various sub-surface materials. The work also includes the furnishing of equipment, operating personnel for drilling equipment, collection, packaging and marking of samples, and all packing, sampling and drilling supplies.

2. INVESTIGATIONS TO BE CONDUCTED

The manner in which the drilling, testing, and sampling shall be performed shall be as specified in the following Geotechnical Investigation Specifications:

No. 1 – Mobilization No. 12 – Drive Sampling No. 15 - Earth Augering and Sampling No. 17 - Undisturbed Sampling: Thin-Wall Push Tube or Hydraulic Piston Samples

All holes will be backfilled before leaving the site. Holes will be backfilled with soils material containing enough fines to constitute a binder.

3. EQUIPMENT AND SUPPLIES

The Contractor shall furnish:

a. A fully equipped rotary foundation investigation drill rig on power driven mobile mounting to perform the work. The size and power of the drill rig shall be equivalent to CME-55 or approved equal. The drill rig shall have a 5-foot continuous rotary penetration drive to accommodate 5-foot length NX (3-inch) inside diameter hollow stem flight augers. The drill rig shall have the ability to pull the flight augers straight up with soil material attached for collecting disturbed samples from various depths. The mobile drill rig mounting must be equipped with a minimum of two leveling jacks. The drilling units must be capable of maneuvering in various types of terrain to perform the work under this contract.

The unit shall be capable of performing the specified drilling operations to an anticipated maximum depth of 50 feet. The drilling units shall be equipped for fluid circulation and capable of augering or drilling a maximum 8>-inch diameter hole. The drill head must retract or swing

NRCS SOLICITATION AG-8C30-S-10-0001

Santa Cruz Site #1 FWRS Rehabilitation aside for ease of handling tools, drill rods and sampling equipment.

b. Minimum NX 3-inch inside diameter hollow stem augers for drilling drive sample holes in alluvial deposits and poor to noncohesive materials.

c. Bucket type samplers for use in clay materials. Augers capable of recovering disturbed samples in gravelly materials. Rock bits and chopping bits suitable for making minimum NX diameter drill holes.

d. Water truck with a minimum 600 gallon capacity tank if deemed appropriate for the testing required.

e. NX minimum inside diameter flush joint casing or hollow stem auger shall be provided whenever casing is required for NX diameter sampling or testing. Larger size casing must be provided when needed to stabilize drill holes for undisturbed sampling.

Drive shoes and driver must be on hand in order to seat casing to a tight seal. Short lengths of casing are needed in order to set casing at designated sampling and testing depths.

f. Thin wall (Shelby) push tube head assembly, thin wall push tube samplers 3” +-1/4” with expanding end plugs or caps, tape and wax.

g. Standard release 140 pound-30-inch free fall drop hammer and

2-inch diameter split tube samplers. ASTM D1586.

h. Furnish water for use in drilling fluids and permeability tests.

i. Drilling compounds for use in caving holes where no permeability tests are to be performed; cement and sand for grouting holes.

j. Any other equipment and/or materials, such as welding equipment, tools, fuels, oils, greases, ropes and replacement parts.

k. In order to meet environmental concerns, the drill rig will be clean, have no hydraulic leaks, and have a spill kit containing absorbent available in case of leakage.

4. CLOSURE OF DRILL HOLES

Those portions of all drill holes that are in bedrock including indurated tuff, basalt, partially consolidated strata shall be filled either with neat-cement or sand-cement. No holes shall be

NRCS SOLICITATION AG-8C30-S-10-0001

Santa Cruz Site #1 FWRS Rehabilitation abandoned without specific prior approval. If artesian water flow is encountered in any hole, the artesian zone in such hole shall be effectively sealed off from other strata by means of acceptable plugs or packers prior to filling the hole.

Those drill holes in the dam embankment will be grouted IAW USACE Engineer Regulation 1110-1-1807.

No separate or direct payment will be made for closure of any hole, including sealing of artesian zones; the cost thereof shall be considered, in each instance, to be included in the cost of drilling.

5. MEASUREMENT AND PAYMENT

For items of work for which specific unit prices are established, the work will be measured by the Government Representative to the nearest 1/4 hour actual time.

Payment will be made at the contract unit price as shown on the bid schedule. Payment will constitute full payment for all labor, furnishing of all materials, equipment, transportation, and all other items necessary and incidental to the conducting of the investigation, as specified in Section 1, SCOPE.

a. Time to be included for payment:

(1) Time during which the work described under Bid Item 2 of the specification is being performed.

(2) Whenever the equipment and operations are held idle for the convenience of the Government.

(3) Time spent in moving from one exploration hole to another on site.

b. Time to be excluded from payment:

(1) Time during which operations are suspended by the Contracting Officer's Representative because of weather or other conditions.

(2) Nonproductive time due to interruption in actual operation because of fire or accidental damage, inadequacy of the equipment or crew, or for any reason due to the fault of the Contractor.

(3) Time required for maintenance repairs, refueling, greasing and oiling of the equipment, and procuring water for drilling and/or testing.

c. Fishing Time:

If drilling tools, testing equipment or casing are lost or stuck in hole because of the nature of the material encountered and fishing becomes necessary, no more than one hour will be allowed for retrieving the equipment as payment under this contract.

No payment will be made for any tools or equipment which are not recovered.

Compensation for any item of work described in the contract but not listed in the bid schedule will be included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in Section 6 of this specification.

6. ITEMS OF WORK AND INVESTIGATION DETAILS

The items of work to be conducted in accordance with this specification and the investigation details are:

Holes will be drilled in a desiccated, hard compacted earth fill embankment. The downstream holes are in an alluvial fan environment with materials ranging from clean to dirty sands with and without gravel to dirty gravel/cobble mixtures. Some carbonate cementation and silty clay zones are present.

a. Mobilization/Demobilization of equipment and personnel.

b. Dam/Dike Embankments—Nine soil coring and augering holes with

SPT’s on the dam/dike embankment crest. The deepest holes expected to be 155 feet with a total of 64 SPT’s 453 feet of soil augering, and 24 Shelby tubes. Drilling will be in accordance with the U.S. Army corps of Engineers’ ER 1110-1- 1807 Procedures for Drilling in Earth Embankments. Holes to be backfilled with neat cement or bentonite/cement grout. A total of nine holes with a total footage of about 660 feet.

c. Downstream of dam/dike embankments—Five soil coring and augering holes with 29 SPT’s, 203 feet of soil augering, and 15 Shelby tubes to a maximum depth of 101.5 feet. Total footage equals 270 feet. Bulk samples would be a composite from hole cuttings. Holes to be backfilled with cuttings and soil from surrounding area.

NRCS SOLICITATION AG-8C30-S-10-0001

Santa Cruz Site #1 FWRS Rehabilitation

1. MOBILIZATION

The work shall consist of the mobilization Contractor's plant, to attend a coordination meeting prior to the start of the work, initial transportation of personnel, equipment, and operating supplies to the site, and safe transportation of undisturbed samples to the testing facility. Transportation of the samples shall be accomplished carefully and shall be subject to the approval of the Government Representative. This specification shall not include mobilization for any specific item of work for which payment for mobilization is provided elsewhere in the contract.

The specification covers mobilization for work required by the contract or the time of award. If additional mobilization costs are incurred during performance of the contract as a result of change or added items of work for which the Contractor is entitled to an adjustment in contract price, compensation for such costs will be included in the price adjustment for the items of work changed or added.

2. PAYMENT

Payment will be made at the completion of the drilling. Total payment will be the lump sum contract price for mobilization, regardless of actual cost to the Contractor.

Payment of the lump sum contract price for mobilization will constitute full compensation for all labor, materials, equipment, and all other items necessary and incidental to completion of the work.

Compensation for any item of work described in the contract but not listed in the bid schedule will be included in the payment for the item of work to which they are made subsidiary are identified in Section 3 of this specification.

12. DRIVE SAMPLING

This work shall consist of the drive sampling procedure to measure the resistance of subsurface materials to the penetration of the sampling tool and to obtain representative samples for identification and testing.

2. EQUIPMENT

The equipment to be used shall be as set forth in ASTM D1586. The Contractor will furnish the tools, equipment, personnel, and other items needed to perform the work.

A sample retainer shall be available and used should the 2-inch OD-1 3/8-inch ID sampler not retain a sample.

3. PROCEDURE

The procedure to be used for drive sampling shall be as set forth in ASTM D1586, except that Section 4 entitled "Report" and paragraph 3.6 are not required of the Contractor.

The Government Representative will designate location of samples to be taken. The Contractor shall conduct his work to provide the best possible conditions for accurate determinations of the kind of material and depth or elevation of each stratum encountered.

Each type of material from each sample shall be placed in a separate container and labeled on the lid with the following information:

a. Project Name

b. Test hole number

c. Depth

d. Sample number

e. Blow count for each 6 inches of penetration

f. Length of recovery

4. MEASUREMENT AND PAYMENT

Measurement and payment for the work included in this specification is subsidiary to items of work and investigation details of Specification 15, EARTH AUGERING AND SAMPLING.

5. ITEMS OF WORK AND INVESTIGATION DETAILS

a. Dam/Dike Embankments—Nine soil coring and augering holes with

SPT’s on the dam/dike embankment crest. The deepest holes expected to be 155 feet with a total of 64 SPT’s

b. Downstream of dam/dike embankments—Five soil coring and augering holes with 29 SPT’s.

c. Item 3. Procedure-No sample containers are required.

17. UNDISTURBED SAMPLING: THIN-WALL PUSH TUBE OR HYDRAULIC

PISTON SAMPLES

This work shall consist of a procedure for obtaining subsurface samples of unconsolidated cohesive materials such as silt or clay in such a manner that the soil will be subjected to a minimum degree of disturbance. The samples obtained shall represent as accurately as practicable the natural condition of the soil and shall be suitable for testing in a soil mechanics laboratory.

2. EQUIPMENT AND SUPPLIES

The type of device used for undisturbed samples shall vary according to the nature of the material to be recovered, but in all cases it shall provide a sample of 3-inch ~ 1/2-inch in diameter and 24 inches in length.

Firm silts and clays free from obstructions and significant amounts of granular materials will be sampled with a standard thinwall type tube sampler or approved equal. Silt and clay materials too soft to be recovered with a thin-wall type sampler shall be sampled with a stationary piston type sampler or approved equal. In order to provide a minimum degree of disturbance the undisturbed sampling device or devices used shall have a reduced clearance at the cutting edge such that the difference between the internal diameter of the sampler and the internal diameter of the cutting edge amount to 0.5 percent plus or minus 0.1 percent of the internal diameter of the cutting edge, or other characteristics approved by the Government Representative. Plugs or caps, wax and tape shall be required to seal the samples.

3. PROCEDURE

In general, the procedure shall be as specified in Geotechnical Investigation Specification 15, Earth Augering and Sampling, to and including the cleaning out of the casing preparatory to taking the sample.

From this point on, the procedure shall be as follows:

Final cleaning out of the hole shall be done in such a manner that the soil immediately below the bottom of the hole shall suffer minimum disturbance. The samplers shall be forced into the soil at a uniform rate.

There shall beno rotation of the sampler during its downward movement.

Particular care shall be taken to avoid a rate of penetration which exceeds the rate at which air or water can escape from the venting device at the top of the sample without distorting the upper portion of the sample by excessive pressure. The maximum rate of penetration and withdrawal of the sampling device shall be approximately one-tenth foot per second unless otherwise directed by the Government Representative.

Unless expressly authorized by the Government Representative for a specific case, samplers shall not be driven with a drop hammer to obtain an undisturbed sample. Penetration shall be effected by means of loading

NRCS SOLICITATION AG-8C30-S-10-0001

Santa Cruz Site #1 FWRS Rehabilitation the drill pipe with a suitable static weight, by means of hydraulic jack, or by other means approved by the Government Representative.

Particular care will be taken during thin-wall push tube operation in order that depths of penetration can be accurately determined to prevent overdriving. All equipment shall be checked before the operation begins to be sure it will function properly. After completion of the drive, it is advisable to wait several minutes before starting the actual separation and withdrawal operation in order to allow full development of adhesion and friction between the sample and the sampling tube.

Samples obtained shall meet the approval of the Government Representative.

4. PRESERVATION OF SAMPLES

Immediately after they are recovered, the undisturbed soil samples in the thin tubes shall be carefully squared up at each end. The end of the tubes shall be closed with expanding plugs or with snugly fitting caps (to be furnished by the Contractor) which shall be secured in place with plastic tape. Each sample shall be marked on the outside with waterproof paint, a waterproof wax pencil, or other suitable means to show:

a. Top end of sample

b. Site number or location

c. Test hole number

d. Depth or elevation

Particular care shall be used by the Contractor when handling undisturbed samples to avoid dripping, jarring, or rolling so as to eliminate the possibility of any shock or sudden movement which might later alter the conditions of the sample. Samples shall not be placed in the hot sun and shall be protected from freezing.

5. MEASUREMENT AND PAYMENT

Measurement and payment for the work included in this specification is subsidiary to items of work and investigation details of Specification 10, GENERAL INVESTIGATION.

6. ITEMS OF WORK AND INVESTIGATION DETAILS

The items of work to be conducted in accordance with this specification and the investigation details are:

a. Dam/Dike Embankments-Nine soil coring and augering holes with Shelby tubes on the dam/dike embankment crest. The deepest holes expected to be 155 feet with a total of 24 Shelby tubes.

b. Downstream of dam/dike embankments-Five soil coring and augering holes with 15 Shelby tubes.

15. EARTH AUGERING AND SAMPLING

This work shall consist of a procedure for advancing the drill hole and to obtain representative bulk disturbed earth samples with helical flight augers.

2. EQUIPMENT

A drill rig capable of efficiently performing 5-inch augering operations shall be required. A minimum 5-inch diameter helical flight augers shall be used to advance the hole and obtain bulk disturbed samples.

3. PROCEDURES

The Government Representative will designate the drill hole locations at which earth augering operations are to be conducted.

The Contractor shall conduct his work to provide the best possible conditions for accurate determinations of the material and depth of each stratum encountered.

Augers are to be advanced in a manner that shall provide the least disturbed sample of materials penetrated. A minimum 5-inch diameter auger shall be advanced a maximum distance of two feet and lifted from the drill hole. The auger shall not be rotated after the sampling depth has been reached and while the auger is being lifted from the hole. The earth material shall be removed from the auger and placed in 25-pound sample bag. The bag will be marked with the following information:

a. Project name

b. Site number

c. Test hole number

d. Depth

e. Sample number

4. MEASUREMENT AND PAYMENT

Measurement and payment for the work included in this specification is subsidiary to items of work and investigation details of Specification 10, GENERAL INVESTIGATION.

NRCS SOLICITATION AG-8C30-S-10-0001

Santa Cruz Site #1 FWRS Rehabilitation

5. ITEMS OF WORK AND INVESTIGATION DETAILS

a. Dam/Dike Embankments—Nine soil coring and augering holes with

SPT’s on the dam/dike embankment crest. The deepest holes expected to be 155 feet with a total of 453 feet of soil augering. Drilling will be in accordance with the U.S. Army corps of Engineers’ ER 1110-1-1807 Procedures for Drilling in Earth Embankments. Holes to be backfilled with neat cement or bentonite/cement grout.

b. Downstream of dam/dike embankments—Five soil coring and augering holes with 203 feet of soil augering to a maximum depth of 101.5 feet. Bulk samples would be a composite from hole cuttings. Holes to be backfilled with cuttings and soil from surrounding area.

Appendix B

Geological Investigation Sampling Locations

AG8C30S100001_DrillingLocations

6200 JEFFERSON ST NE

ALBUQUERQUE, NEW MEXICO 87109

6200 JEFFERSON ST NE, ALBUQUERQUE, NM 87109

6200 JEFFERSON ST NE, ALBUQUERQUE, NM 87109

6200 JEFFERSON ST NE

ALBUQUERQUE, NEW MEXICO 87109