W912EP18R0048_00_31_32_GDR.pdf

SECTION 00 31 32

Geotechnical Data Report for

Guajataca Dam Interim Risk Reduction Measures

Prepared by

Geotechnical Branch

Engineering Division

Jacksonville District Corps of Engineers

7 May 2018

GEOTECHNICAL DATA REPORT

Table of Contents

1 SCOPE

2 PROJECT BACKGROUND

3 CHARACTER OF MATERIALS

3.1 Regional Geology

3.2 The Local Geology

3.3 Materials Encountered

4 DEFINITIONS

4.1 Definitions of Basic Terms

4.2 Current Logging Terms

4.3 Previous Logging Terms

4.4 Testing and Procedure Methods

5 GEOTECHNICAL DATA

5.1 Summary of Field Investigations

5.2 Summary of Index Testing Data

5.3 Boring Log Notes

5.4 Inspection of Recovered Materials

5.5 Boring Logs

5.6 Sponsor provided data

5.7 Laboratory Testing Data

List of Tables

Table 1. Available Boring Data Table 2. Available Sponsor-provided Data Table 3. Available Test Pit Data Table 4: Index Testing Available for this Project

List of Plates

Plate B-1. Vicinity Map Plate B-2. Location of Field Investigations Plate B-3. Location of Field Investigations (Cont.)

Plate B-4. Location of Field Investigations Plate B-5. Location of Sponsor-provided Data

Guajataca Dam Interim Risk Reduction Measures DRAFT (80%)

00 31 32-1

GEOTECHNICAL DATA REPORT

1 SCOPE

The information provided in this section encompasses the geotechnical field investigations available for this project. The investigations consist of borings and test pits. The associated boring logs are presented in paragraph 5.5. A character of materials paragraph is included to provide a comprehensive description of the materials utilizing both recent and historical knowledge of the project area. Also included in this section are definitions of terms and boring log notes, which provide additional explanation of the boring logs and drilling techniques.

Items discussed in the character of materials paragraph may not appear explicitly on the boring logs. Based on historic knowledge of the project area, the character of materials paragraph includes items that supplement the data documented by the boring logs. When reviewing the boring logs, use all of the data on the logs, including the materials description, legend, and blow counts. When evaluating the subsurface conditions, use all of the data, including the character of materials paragraph and boring logs.

During the solicitation period, any questions that pertain to the information provided in this section should be addressed to the contract specialist identified in Block 9 of SF1442. After contract award, questions should be addressed to the appointed ACO/COR, which will coordinate with Geotechnical Branch.

2 PROJECT BACKGROUND

Guajataca Dam is a hydraulic fill dam that was constructed in the 1920’s. It is located northwest Puerto Rico, between the municipalities of Isabela and Quebradillas. During September 2017 Hurricane Maria hit the Island, causing severe precipitation. This resulted in erosion and collapse of the spillway. Emergency repairs took place during Stage 1 of the project. These measures included the placing of jersey barriers, water diversion, and rip rap to prevent further erosion, among other measures. Stage 2 repairs include the replacement of eroded material, grouting of placed rip rap, among other measures.

3 CHARACTER OF MATERIALS

3.1 REGIONAL GEOLOGY

Guajataca Dam is located in northwestern Puerto Rico, within the Northern Puerto Rico Karstic Zone (NPRKZ). Exposed rocks in northwest PR consist primarily of volcanic rocks of Eocene, and (partially) Cretaceous and Paleocene age overlain uncomformably by a sequence of sedimentary rocks ranging in age from middle Oligocene to Holocene. Most of the sequence of Oligocene and Miocene age is limestone, except in the lower part where beds of sands and gravel are present.

At the base of the sequence of sedimentary rocks, is the San Sebastián Formation (Fm.) of Middle to Upper Oligocene age. It consists of sands and gravel, and contains thin lenses of clay, and very clayey limestone. Fossils are abundant in some beds. The Lares Limestone (Lmst.) comformably overlays the Sand Sebastián Fm. to the east. The San Sebastián Fm. intertongues with the Lares to the west and central part of the region. The Lares Lmst. ranges in age from Middle to Upper Oligocene. The Lares Lmst. consists of alternating beds of earthy limestone, hard coralline chalk, calcareous clay, and thin lenses of sand and gravel, similar to the San Sebastián Fm., corals, oysters and other mollusks, and large Foraminifera are common.

Guajataca Dam

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In the central part of the region, where the Lares Lmst. intertongues with the San Sebastián Fm., the Cibao Fm. overlays the San Sebastián Fm. The Cibao Fm., of Upper Oligocene to Lower Miocene age, consists of interbedded calcareous clay, soft earthy chalk, and hard very fine grained calcarenite and nongranular limestone. To the east, the Guajataca Member (M.) is found within the middle of the Cibao Fm. The Guajataca M. contains many lenses of sand and gravel as much as 15 m thick. The Cibao is generally fossiliferous, and locally contains many oysters, an abundance of other mollusks, a few corals, and a few large Foraminifera.

Comformably overlaying the Cibao Fm., is the Aguada Lmst., of Lower Miocene age. The base of the Aguada is a bed of hard medium-grained calcarenite. The lower member of the Aguada, occurs to the east, and it consists of granular chalky soft limestone or marl, and contains discontinuous beds of fine to medium-grained fossiliferous calcarenite. Although this part resembles the Cibao, it contains much less clay. The lower member is overlain by thick layers of very pale orange to pink hard calcarenite alternating with chalky and rubbly limestone (upper member). To the west, the lower member grades laterally into hard calcarenitic limestone like the upper member to the east. The Aguada is locally fossiliferous, containing the foraminifer Marginopora sp., some corals, a few molluska, but fossils are much less common than in the Cibao. Oysters are very rare. At the top, and locally at lower postitions, the Fm. contains orange to pink granular thin-bedded and cross-laminated limestone, which is used as a marker for the top of Fm.

The Aguada Lmst. is overlain sharply but comformably by the Aymamón Lmst., which primarily consists of white to very pale orange, very pure fossiliferous limestone, generally indurated at the surface into finely crystalline rather dense limestone. In northwestern PR, the Aymamón contains many thick lenses or beds of very pale orange to bright yellow, slightly ferruginous chalk containing many beds of large oysters, and other fossils; these beds are interbedded with hard white limestone.

The Aymamón Lmst. is overlain near Isabela by the lower part of the Camuy Fm., of Miocene age.

It consists of thin-bedded and cross-laminated to massive ferruginous chalk and calcarenite varying in color from very pale orange to pale reddish brown. Resting uncomformably, are discontinuous deposits of sand, clay, and sandy gravel of late Tertiary to Holocene age. Most of these deposits are alluvium and various kinds of beach deposits.

3.2 THE LOCAL GEOLOGY

The Guajataca Dam is reported to be founded on the Guajataca Member of the Cibao Fm.

Surrounding the Dam, colluvium material can be encountered on the edges of the escarpment that is comprised of Aguada Lmst. According to preconstruction topography drawings, the current spillway was constructed over a natural gully.

3.3 MATERIALS ENCOUNTERED

Fill was encountered in depths ranges from approximately 0.8 m on top of the spillway up to approximately 4 m thick at the edge of the eroded section (GDPR-CB-09). Fill was characterized as clayey with few sand to gravel-sized limestone fragments in the first meter, to sandy with little to some gravel-sized limestone fragments at the bottom. On top of the spillway (GDPR-CB-05), moderately weathered limestone was encountered underlaying fill material, which in turn was underlain by an approximately 0.5 m thick layer of clayey sand.

Underlaying fill in the lower parts of the spillway, and the clayey sand on top of the spillway, a series of limestone interbedded with clays, claystones, and siltstones are found. Limestone thickness varies from a few centimeters to meters thick. Its hardness and its weathering also varies from very soft to very hard, and from slightly weathered to highly weathered. Limestone was described as porous, and fossiliferous at various depths. Claystones are described as sparsely fossiliferous, mottled at various depths, and moderately to highly weathered. Clays are described as hard, and containing little to some carbonate sand and silt. Siltstones are described as mostly

Guajataca Dam

00 31 32-3 marl in composition, with trace sand, and little clay. In very limited extent, silt layers were found, and are described as little carbonate sand, and few clay. Some organic matter was encountered in the silt layers (GDPR-CB-08).

4 DEFINITIONS

Definitions not explicitly indicated in the sections below are typical industry standard definitions from their respective ASTMs.

4.1 DEFINITIONS OF BASIC TERMS

Carbonate – Soil component that reacts with HCl of an indeterminate origin (shell, rock, etc.).

Fill – Material that has been placed by man, described with all soil characteristics.

Layer – Rock or soil with a thickness of 6 inches or less.

Lens – A geologic deposit of variable thickness, which disappears laterally in all directions and cannot be correlated to adjacent borings.

Rock – A naturally occurring substance composed of one or more minerals bound together. This geologic term includes a range of engineering properties: strength, hardness, permeability, weathering, and discontinuity. These properties are noted or can be inferred from the boring logs as blow counts, penetration rate, RQD, hardness, etc.

Shell – Material composed of predominantly (>75%) coarse-grained sand to gravel-sized whole or broken shell.

4.2 CURRENT LOGGING TERMS

Definition of terms used on boring logs dated since 2000:

Banded - 0.02' (6 mm) to 0.1' (3.0 cm).

Boulder-Sized – Particles greater than 12 inches in diameter.

Cavity - Voids greater than the diameter of the core.

Coarse Grained - Grain diameter greater than 0.079" (2 mm) for sedimentary rocks or 0.197" (5

mm) for igneous or metamorphic rocks.

Coarse Grained Sand-Sized – Less than 10 percent of fine and medium grained sand sizes are present.

Coarse Gravel-Sized – Particles greater than 3/4 of an inch but less than 3 inches in diameter.

Cobble-Sized – Particles greater than 3 inches but less than 12 inches in diameter.

Decomposed – Applicable to saprolitic rock; rock is essentially reduced to a soil with a relic rock texture; can be molded or crumbled by hand.

Dipping (Dip) - 20 to 45 degrees.

Discontinue – Particles were present within the unit above but are no longer present.

Fine Grained - Grain diameter between 0.004" (0.1 mm) and 0.016" (0.4 mm) for sedimentary rocks or 0.039" (1 mm) for igneous or metamorphic rocks.

Fine Grained Sand-Sized - Less than 10 percent of medium and coarse grained sand sizes are present.

Fine Gravel-Sized – Particles greater than No. 4 sieve but less than 3/4 of an inch in diameter.

Flat (Dip) - 0 to 20 degrees.

Fossiliferous – Greater than 40 percent fossils.

Hard (Hardness) - Difficult to scratch with a knife (cannot be pitted with a geology hammer, but can be chipped with moderate blows of the hammer).

Highly Fractured - Spacing 0.3' (9.1 cm) to 1' (30.5 cm).

Highly Weathered - Entire section is discolored; alteration is greater than 50%; some areas of slightly weathered rock are present; some minerals are leached away; retains only a fraction of its original strength (wet strength usually lower than dry strength).

Intact – Spacing greater than 6' (1.8 m).

Intensely Fractured - Spacing less than 0.3' (9.1 cm).

Massive – Over 3' (0.9 m) thick.

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Medium-Bedded - 0.3' (9.1 cm) to 1' (30.5 cm) thick.

Medium Grained - Grain diameters between 0.016" (0.4 mm) to 0.079" (2 mm) for sedimentary rocks or 0.039" (1 mm) to 0.197" (5 mm) for igneous or metamorphic rocks.

Medium Grained Sand-Sized - Less than 10 percent of fine and coarse grained sand sizes are present.

Moderately Fractured - Spacing 1' (30.5 cm) to 3' (0.9 m).

Moderately Hard (Hardness) - Can be scratched easily with a knife, but cannot be scratched by a fingernail (can be pitted with moderate blows of a geology hammer).

Moderately Open (Fracture Aperture) - 0.020" (0.5 mm) to 0.098" (2.5 mm).

Moderately Weathered - Discoloration is evident; surface is pitted and altered, with alterations penetrating well below rock surfaces; 10% to 50% of the rock is altered; strength is noticeably less than unweathered rock.

Non-fossiliferous – No observed fossils.

Open (Fracture Aperture) - 0.098" (2.5 mm) to 0.394" (10 mm).

Pitted - Voids 0.039" (1mm) to 0.236" (6mm) in diameter.

Porous - Voids less than 0.039" (1mm) in diameter.

Slightly Fractured - Spacing 3' (0.9 m) to 6' (1.8 m).

Slightly Weathered - Superficial discoloration, alteration and/or discoloration along discontinuities;

less than 10% of the rock volume is altered; strength is essentially unaffected.

Soft (Hardness) - Can be scratched with a fingernail (cannot be crumbled between fingers, but can be easily pitted with light blows of a geology hammer).

Solid - Absence of voids.

Sparsely Fossiliferous – Less than 40 percent fossils.

Steeply Dipping (Dip) - 45 to 90 degrees.

Thick-Bedded – 1' (30.5 cm) to 3' (0.9 m) thick.

Thin-Bedded - 0.1' (3.0 cm) to 0.3' (9.1 cm) thick.

Thin Parting - Paper thin to 0.002' (0.6 mm).

Tight (Fracture Aperture) - 0.004" (0.1 mm) to 0.020" (0.5 mm).

Unweathered - No evidence of any mechanical or chemical alteration.

Very Fine Grained - Grain diameter less than 0.004" (0.1 mm); individual grains or crystals are too small to be seen with the naked eye.

Very Hard (Hardness) - Cannot be scratched with a knife (chips can be broken off only with heavy blows of a geology hammer).

Very Soft (Hardness) - Can be deformed by hand (has a rock-like character, but can be easily broken by hand).

Very Tight (Fracture Aperture) - less than 0.004" (0.1 mm).

Very Wide (Fracture Aperture) - 0.394" (10 mm) to 0.984" (25 mm).

Vuggy - Voids 0.236" (6mm) to the diameter of the core.

4.3 PREVIOUS LOGGING TERMS

Definition of terms used on boring logs dated before 2000:

Dense – Equivalent to SPT N-value of 30 to 50.

Incompetent – Rock that disintegrates while coring; weak.

Indurated – Rock or soil hardened or consolidated by pressure or cementation. Very difficult to break by hand.

Poorly-Indurated – See semi-indurated.

Seam – Rock or soil with average thickness of 2 to 3 inches.

Semi-Indurated – Rock or soil with a lesser degree of hardening or consolidation by pressure or cementation. Crumbles with little effort by hand.

00 31 32-5

4.4 TESTING AND PROCEDURE METHODS

Test/Procedure Method Abrasion Resistance of Large-Size Coarse Aggregate, Los Angeles Machine ASTM C535

Abrasion Resistance of Small-Size Coarse Aggregate, Los Angeles Machine ASTM C131

Air Content by the Pressure Method ASTM C231 Air Content by the Volumetric Method ASTM C173 Air-Entraining Admixtures for Concrete ASTM C233 Atterberg Limits, wet preparation method, test method a multipoint ASTM D4318 Bulk Specific Gravity of Bituminous Mixtures ASTM D2726 Capping Cylindrical Concrete Specimens ASTM C617 Carbonate Content ASTM D4373 Compaction: 4" Mold, Modified Proctor ASTM D1557 Compaction: 4" Mold, Standard Proctor ASTM D698 Compaction: 6" Mold, Modified Proctor ASTM D1557 Compaction: 6" Mold, Standard Proctor ASTM D698 Compressive Strength of Cast in Place Concrete Cylinders ASTM C873 Compressive Strength of Cylindrical Concrete Specimens (Set of 4) ASTM C39 Compressive Strength of Lightweight Concrete ASTM C495 Consolidation, each load of rebound increment with complete time ASTM D2435

Density and Water Content of Soil by Nuclear Methods (Minimum 4) ASTM D2922/D3017

Density of Bituminous Concrete in Place by Nuclear Methods (Minimum 4) ASTM D2950

Density of Soil in Place by the Sand-Cone Method ASTM D1556 Direct Shear ASTM D3080 Drilled Cores and Sawed Beams of Concrete ASTM C42 Extraction of Bituminous Paving Mixtures ASTM D2172 Freezing and Thawing (up to 55 cycles) ASTM D5312 Grain size sieve Analysis ASTM D422 Hydrometer Analysis ASTM D422 Making and Curing Concrete Test Specimens in the Field (Set of 6) ASTM C31 Making and Curing Concrete Test Specimens in the Lab (Set of 4) ASTM C192 Marshall Resistance to Plastic Flow (Set of 3) ASTM D1559 Material Passing No. 200 Sieve ASTM D1140 Modulus of Elasticity ASTM D3148 Moisture Content ASTM D2216

Munsell Color Munsell Soil Color Charts

Organic Content, Test Method C ASTM D2974 Organic Impurities in Fine Aggregate ASTM C40 Permeability: Constant Head Permeability ASTM D2434 Permeability: Falling Head Permeability ASTM D5084 Petrographic Examination ASTM C295 Sampling Aggregate (Minimum 4 hours) ASTM D75 Sampling Freshly Mixed Concrete ASTM C172 Sedimentation Rate No ASTM

Guajataca Dam

00 31 32-6

Test/Procedure Method Sieve Analysis of Aggregate ASTM C136 Slump of Hydraulic-Cement Concrete ASTM C143 Soil Classification (Boring logs) ASTM D 2488 Specific Gravity and Absorption of Fine Aggregate ASTM C128 Specific Gravity for Rock ASTM C127 Specific Gravity for Soil ASTM D854

SPLITTING TENSILE STRENGTH ASTM D3967

Splitting Tensile Strength of Concrete Cylinders ASTM C496 Subsample Preparation ASTM D4220, Group B ASTM D4220 Sulfate Soundness ASTM C88 Total Evaporable Moisture Content ASTM C566 Triaxial Compression Test for Rock with Strain Gages or LVDTs (per confining pressure) ASTM D2664

Triaxial compression: Consolidated Undrained (CU) Triaxial Compression Test R Test with Pore Pressure Measurements (per confining pressure)

ASTM D4767

Triaxial compression: Unconsolidated Undrained (UU) Triaxial Compression Test Q Test with Pore Pressure Measurements (per confining pressure)

ASTM D2850

Unbonded Caps for Compressive Strength ASTM C1231 Unconfined Compressive Strength for Rock Greater than 9,000 psi with Strain ASTM D2938

Unconfined Compressive Strength for Rock up to 9,000 psi with Strain ASTM D2938

Unconfined Compressive Strength for Soil ASTM D2166 Unified Soils Classification System for Roads, Airfields, Embankments, and Foundations MIL-STD-619B

Unit Weight and Absorption ASTM C127 Unit Weight of Aggregate ASTM C29 Visual Percent Shell No ASTM Wetting and Drying ASTM D5313

5 GEOTECHNICAL DATA

5.1 SUMMARY OF FIELD INVESTIGATIONS

The tables below summarize the field investigations data set available for this project.

Table 1. Available Boring Data

Designation State Plane, PR-VI 5200, NAD83 Project Location Available for Inspection X Y

GDPR18-CB-05* 147996.32 262367.72

Spillway Not available for inspection.

GDPR18-CB-06* 148005.1 262417.64

GDPR18-CB-06A* 147987.36 262445.29

GDPR18-CB-08* 147969.64 262485.55

GDPR18-CB-09* 148004.14 262468.04

GDPR18-CB-10* 147893.53 262566.63

GDPR18-CB-11* 147989.51 262560.91

Guajataca Dam

00 31 32-7

Designation State Plane, PR-VI 5200, NAD83 Project Location Available for Inspection X Y

GDPR18-CB-11A* 147991.01 262564.91 Spillway Not available for inspection.

* Coordinates presented correspond to the project coordinate system and datum

Table 2. Available Sponsor-provided Data

Designation State Plane, PR-VI 5200, NAD83 Project Location Available for Inspection X Y D-H-1 262382 262382

Spillway Not available for inspection.

D-H-2 262355 262355 D-H-3 262376 262376 D-H-4 262402 262402 D-H-5 262428 262428 D-H-6 262452 262452 D-H-7 262488 262488 D-H-8 262503 262503 D-H-9 262517 262517

D-H-10 262551 262551 D-H-11 262556 262556 D-H-12 262569 262569 D-H-13 262542 262542

PR-10 262340 262340

Table 3. Available Test Pit Data

Designation State Plane, PR-VI 5200, NAD83 Project Location X Y TP18-GDPR-1 147960.2 262543.7 Spillway eroded area TP18-GDPR-2 147901.5 262574.6

5.2 SUMMARY OF INDEX TESTING DATA

The table below summarizes the index testing available for this project.

Table 4: Index Testing Available for this Project

Boring Designation

Sample Designation USCS LL PL PI wn GS Munsell

Color

GDPR18-CB-06A 14-16’ CL 34 16 18 18.6

GDPR18-CB-06A 40-42’ CL 24 15 9 11.6

GDPR18-CB-06A 50-52’ CL 49 18 31 37.2

GDPR18-CB-08 8-10’ CL 32 13 19 10YR 8/2

GDPR18-CB-08 12-14’ CH 50 20 30 15.8 5GY 7/1

GDPR18-CB-08 14-16’ CL 44 20 24 15.5 5GY 6/1

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00 31 32-8

Boring Designation

Sample Designation USCS LL PL PI wn GS Munsell

Color

GDPR18-CB-08 20-22’ CH 50 22 28 13.5 2.5Y 6/6

GDPR18-CB-08 26-28’ CL 22 14 8 5G 5/1

GDPR18-CB-08 32-34’ CL 23 15 8 16.9 N 5/

GDPR18-CB-08 38-40’ CL-ML 19 15 4 17.8 5GY 5/1

GDPR18-CB-08 40-42’ CL-ML 20 14 6 N 6/

GDPR18-CB-08 42-44’ CL 24 16 8 10Y 4/1

GDPR18-CB-08 50-52’ CL 32 16 16 18.0 10YR 8/2

GDPR18-CB-09 12-14’ GC 25 14 11 9.3

GDPR18-CB-09 30-32’ SC 27 19 8 25.7

GDPR18-CB-09 40-42’ CL 28 13 15 14.2

GDPR18-CB-09 42-44’ CH 71 31 40 26.4

GDPR18-CB-09 50-52’ CH 64 29 35 17.3

GDPR18-CB-09 64-66’ CH 70 32 38 26.4

GDPR18-CB-09 68-70’ CL 28 17 11 16.9

GDPR18-CB-09 70-72’ CL 27 16 11 24.4

GDPR18-CB-09 88-90’ CL 30 18 12 19.6

GDPR18-CB-09 96-98’ CL-ML 22 15 7 16.0

GDPR18-CB-09 102-104’ CL-ML 21 25 7 16.2

GDPR18-CB-11A 32-34’ CL-ML 21 14 7 13.9

GDPR18-CB-11A 44-46’ SM 18 15 3 18.4

USCS: Unified Soil Classification System; LL: liquid limit; PL: plastic limit; PI:

Plastic Index; wn: moisture content; Gs: specific gravity

5.3 BORING LOG NOTES

Borings were driven using the Standard Penetration Test (SPT) procedure with a 140 pound hammer with a 30-inch drop using a 2.0 foot split spoon (1 3/8-inch I.D. and 2-inch O.D.). Borings were advanced in 24-inch intervals, or until refusal was encountered. Refusal is defined as a total of 50 blows of the hammer within any 6-inch increment, a total of 100 blows within any 1-foot increment, or no observed advance of the sampler after 10 successive blows of the hammer.

Test pits were excavated using a backhoe.

5.4 INSPECTION OF RECOVERED MATERIALS

The material recovered from borings is not available for inspection.

00 31 32-9

Plate B-1. Vicinity Map

00 31 32-10

Plate B-2. Location of Field Investigations

00 31 32-11

Plate B-3. Location of Field Investigations (Cont.)

00 31 32-12

Plate B-4. Location of Field Investigations

B B-4

Guajataca Dam

00 31 32-13

Plate B-5. Location of Sponsor-provided Data

B-5

00 31 32-14

5.5 BORING LOGS

Applicable boring logs are presented on the following pages.

While the Government’s borings are representative of subsurface conditions at their respective locations and vertical reaches, local variations in the characteristics of the subsurface materials of this region are to be expected.

Guajataca Dam

00 31 32-15

FILL, clayey, soft, few fine to coarse gravel-sized limestone, few plant debris, wet, 10YR 3/6 dark yellowish brown

At El. 643.3 Ft., few fine to coarse-grained sand-sized carbonate, moist, 10YR 6/6 brownish yellow At El. 643.1 Ft., firm, trace fine to coarse gravel-sized limestone LIMESTONE, moderately weathered, 10YR 8/2 very pale brown

At El. 639.1 Ft., some recrystallization observed At El. 639.1 Ft., non-fossiliferous, some clay

SAND, clayey, mostly fine to coarse-grained sand-sized limestone, little fine to coarse gravel-sized limestone, little clay, moist, 10YR 6/8 brownish yellow

(SC)

CLAY, lean, very soft, little sand to gravel-sized limestone, moist, 10YR 7/4 very pale brown (CL)

At El. 633.1 Ft., 10YR 6/8 brownish yellow

At El. 631.1 Ft., 10YR 8/3 very pale brown

645.1

643.1

641.1

639.1

637.1

635.1

633.1

631.1

S-1

S-2

S-3

S-4

S-5

S-6

S-7

S-8

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

0.00196.64196.64

195.85

194.20

193.46

645.1645.1

642.5

637.1

634.7

0.0

2.6

8.0

10.4

0.0

M od er at el y

W ea th er ed

0.00

0.79

2.44

3.18

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

MANUAL HAMMER

DRILLING LOG

CONTRACTOR FILE NO.

11. MANUFACTURER'S DESIGNATION OF DRILL

COMPLETED

18. SIGNATURE AND TITLE OF INSPECTOR

VERTICAL

INCLINED

DIVISION INSTALLATION

VERTICAL

14. ELEVATION GROUND WATER

HORIZONTAL

1. PROJECT

15. DATE BORING

7. DEPTH DRILLED INTO ROCK

2. BORING DESIGNATION

STARTED

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

Boring Designation

17. TOTAL RECOVERY FOR BORING

10. COORDINATE SYSTEM/DATUM

OF

GDPR18-CB-05

UNDISTURBED (UD)

16. ELEVATION TOP OF BORING

BEARING

8. TOTAL DEPTH OF BORING

SHEETS

5. DIRECTION OF BORING

DISTURBED

DEG. FROM

VERTICAL

SHEET

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

GDPR18-CB-05

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

MVG, Inc.

Jacksonville District

02-18-18

South Atlantic

NAD83

See Remarks

State Plane, PR/VI (M) PRVD02

Mobile B61 HDX

Guajataca Dam IRRM

Spillway

N/A

N/A

Eric García

02-20-18

54 %

Rafael Morales, Geologist

X = 147,996 Y = 262,368

608.1 Ft.

645.1 Ft.

150.0 Ft.

SAJ FORM 1836

JUN 02

(Continued)

Guajataca Dam

00 31 32-16

50/5"

LIMESTONE, moderately weathered, vertical clay seam observed, 10YR 5/4 yellowish brown

LIMESTONE

LIMESTONE, fossiliferous, packestone, 7.5YR 8/2 pinkish white At El. 624.1 Ft., little carbonate fine to coarse-grained sand-sized, few clay, moist, 7.5YR 6/6 reddish yellow

At El. 621.1 Ft., little clay

At El. 618.5 Ft., mostly limestone fine to coarse-grained sand-sized

CLAY, lean, soft, little sand to gravel-sized limestone, moist, 10YR 7/4 very pale brown (CL) At El. 616.4 Ft., 7.5YR 4/6 strong brown

LIMESTONE, non-fossiliferous, trace fenestral pores, gray

CLAY, lean, soft, little sand to gravel-sized limestone, moist, 7.5YR 4/6 strong brown (CL)

SILT, inorganic-L, soft, few fine to coarse gravel-sized limestone, trace clay, moist, 7.5YR 4/6 strong brown

(ML)

SILTSTONE, moderately weathered, limestone layers from 0.07 ft. (0.02

629.1

627.1

625.1

623.1

621.1

619.1

617.1

615.1

613.1

611.1

S-8

S-9

S-10

S-11

S-12

S-13

S-14

S-15

S-16

S-17

S-18

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

191.10

190.86

190.41

188.11

187.45

186.89

186.56

186.28

627.0

626.2

624.7

617.1

615.0

613.1

612.1

611.1

18.2

19.0

20.4

28.0

30.2

32.0

33.1

34.0

M od er at el y

W ea th er ed

5.54

5.78

6.23

8.53

9.19

9.75

10.08

10.36

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

645.1 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 147,996 Y = 262,368

GDPR18-CB-05

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-17

50/5"

50/5"

50/3"

50/5"

50/2"

50/2"

50/5"

m) up to 0.14 ft. (0.04 m) thick, 7.5YR 7/2 pinkish gray At El. 611.0 Ft., highly weathered zone At El. 610.8 Ft., water flow observed At El. 608.6 Ft., 7.5YR 8/2 pinkish white

SAND, poorly-graded, mostly fine to coarse-grained sand-sized carbonate, some fine to coarse gravel-sized limestone, few clay, limestone easily broken along horizontal plane; highly weathered seams observed in limestone (SP)

SILTSTONE, 10YR 7/4 very pale brown

LIMESTONE, highly weathered, 10YR 6/6 brownish yellow

SILT, inorganic-L, soft, mostly silt, little sand to gravel-sized limestone, moist, 7.5YR 8/3 pink (ML) At El. 601.0 Ft., wet CLAY, lean, firm, few sand to gravel-sized limestone, moist, relic limestone fragments observed, 10YR 6/4 light yellowish brown (CL)

At El. 598.6 Ft., few fine gravel-sized limestone CLAYSTONE, moderately weathered, 10GY 5/1 greenish gray

At El. 597.1 Ft., 10YR 2/2 very dark brown

At El. 596.0 Ft., 10YR 7/6 yellow

At El. 595.1 Ft., 10G 3/1 very dark greenish gray LIMESTONE, non-fossiliferous, hard, highly weathered, 10YR 9/2 pale orange yellow

LIMESTONE, hard, mostly silt, few limestone fine to coarse-grained sand-sized

SILT, inorganic-L, mostly sand to gravel-sized limestone, wet, 2.5Y 8/2 pale yellow (ML)

609.1

607.1

605.1

603.1

601.1

599.1

597.1

595.1

593.1

591.1

S-18

S-19

S-20

S-21

S-22

S-23

S-24

S-25

S-26

S-27

S-28

SPT Sampler

SPT Sampler auger advancement: 3 min. for

19"

SPT Sampler

SPT Sampler

SPT Sampler auger advancement: 10 min.

SPT Sampler

SPT Sampler

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 2 min.

SPT Sampler auger advancement: 2 min.

SPT Sampler

185.06

184.09

183.84

183.23

183.06

182.37

181.38

180.79

180.18

180.04 179.92

607.1

604.0

603.1

601.1

600.6

598.3

595.1

593.1

591.1

590.7 590.3

38.0

41.2

42.0

44.0

44.6

46.8

50.1

52.0

54.0

54.5 54.8

M od er at el y

W ea th er ed H ig hl y W ea th er ed

M od er at el y

W ea th er ed H ig hl y W ea th er ed

11.58

12.55

12.80

13.41

13.58

14.27

15.26

15.85

16.46

16.60 16.72

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

645.1 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 147,996 Y = 262,368

GDPR18-CB-05

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-18

50/4"

50/5"

50/2"

50/4"

50/4"

50/3"

CLAYSTONE, moderately weathered, 10YR 7/6 yellow LIMESTONE, non-fossiliferous, moderately weathered, pitted, yellow-brown At El. 588.6 Ft., few clay

At El. 588.1 Ft., highly weathered At El. 588.0 Ft., slightly weathered

CLAYSTONE, moderately weathered, 10YR 8/2 very pale brown At El. 586.9 Ft., 10YR 7/3 very pale brown

At El. 585.1 Ft., wet

At El. 583.1 Ft., 10YR 8/2 very pale brown

At El. 582.1 Ft., mottled tan-white and light brownish-gray, 2.5Y 2.5/1 black At El. 581.7 Ft., mottled olive brown and light brown, 10YR 7/3 very pale brown At El. 581.1 Ft., mottled olive green and green, 10G 5/1 greenish gray CLAYSTONE, mottled greenish-gray and light brown, 10GY 7/1 light greenish gray CLAYSTONE, non-fossiliferous, slightly weathered, 10GY 8/1 light greenish gray At El. 579.0 Ft., thin bedding, bedding orientation

At El. 577.0 Ft., limestone (skeletal wackestone) layer

At El. 575.5 Ft., limestone (skeletal wackestone) layer CLAYSTONE, sparsely fossiliferous, mottled brown and gray, 10GY 6/1 greenish gray

CLAY, lean, mostly clay, some silt, moist, mottled brown and gray, 10GY 6/1 greenish gray (CL)

589.1

587.1

585.1

583.1

581.1

579.1

577.1

575.1

573.1

571.1

S-28

S-29

S-30

S-31

S-32

S-33

S-34

S-35

S-36

S-37

S-38

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler auger advancement: 9 min.

SPT Sampler auger advancement: 5 min.

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 5.5 min.

SPT Sampler auger advancement: 10.5 min.

178.96

177.02

176.52

175.30

174.08

587.1

580.8

579.1

575.1

571.1

58.0

64.4

66.0

70.0

74.0

M od

W ea th er ed

M od

W ea th er ed

H S l.

W ea

M od er at el y

W ea th er ed S lig ht ly W ea th er e d

17.68

19.62

20.12

21.34

22.56

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

645.1 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 147,996 Y = 262,368

GDPR18-CB-05

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-19

50/5"

50/3"

50/1"

50/6"

50/5"

50/2"

50/3"

50/3"

50/3"

50/5"

At El. 571.0 Ft., limestone layer

At El. 569.1 Ft., limestone layer

At El. 568.6 Ft., limestone layer

At El. 567.1 Ft., little silt, few sand to gravel-sized limestone, moist, limestone fragments break down into silt, 10GY 6/1 greenish gray

At El. 565.1 Ft., few clay seams within limestone layers

At El. 563.1 Ft., mostly clay, some fine to coarse-grained sand-sized limestone, moist, sand occuring in lenses, 5G 5/6 Moderate (Yellowish) Green At El. 562.7 Ft., mottled gray, olive gray and white, 5G 5/2 grayish green At El. 561.7 Ft., very hard limestone layer At El. 561.1 Ft., firm, dry, very thin limestone layers, some with brown clay seams in between

LIMESTONE, 5G 8/2 pale green

At El. 557.1 Ft., skeletal grain-packestone, 10B 6/2 Pale Blue At El. 556.8 Ft., 5G 4/1 dark greenish gray

CLAYSTONE, sparsely fossiliferous, few skeletal grains observed, 5B 5/1 bluish gray

At El. 553.1 Ft., highly weathered limestone thin, deformed layer, 10B 6/1 bluish gray

At El. 551.1 Ft., few limestone few to coarse gravel-sized

569.1

567.1

565.1

563.1

561.1

559.1

557.1

555.1

553.1

551.1

S-38

S-39

S-40

S-41

S-42

S-43

S-44

S-45

S-46

S-47

S-48

SPT Sampler auger advancement: 10.5 min.

SPT Sampler auger advancement: 3 min.

SPT Sampler auger advancement: 3 min.

SPT Sampler auger advancement: 4 min.

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 10 min.

SPT Sampler auger advancement: 5.3 min.

SPT Sampler auger advancement: 2.5 min.

SPT Sampler auger advancement: 2 min.

SPT Sampler auger advancement: 7 min.

SPT Sampler auger advancement: 5 min.

170.43

169.21

559.1

555.1

86.0

90.0

H ig hl y

W ea th er ed 26.21

27.43

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

645.1 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 147,996 Y = 262,368

GDPR18-CB-05

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-20

50/6"

50/5"

50/5"

50/3"

50/3"

50/2"

50/4"

50/2"

50/3"

At El. 541.1 Ft., 10GY 6/1 greenish gray

CLAYSTONE, non-fossiliferous, moderately weathered, 5GY 6/1 greenish gray At El. 539.1 Ft., limestone layer 0.16

ft. (0.05 m) thick At El. 538.6 Ft., limestone layer 0.19

ft. (0.06 m) thick At El. 537.1 Ft., sudden drop of water level when bit was extracted

0.5 ft. (0.15 m)

At El. 535.1 Ft., sparsely fossiliferous, 5GY 4/1 dark greenish gray At El. 535.1 Ft., limestone layer 0.09

ft. (0.03 m) thick At El. 534.6 Ft., limestone layer 0.18

ft. (0.05 m) thick CLAYSTONE, sparsely fossiliferous, 10GY 7/1 light greenish gray

At El. 532.2 Ft., mottled olive gray and olive brown, 10GY 4/1 dark greenish gray

LIMESTONE, non-fossiliferous, highly weathered, 10GY 7/1 light

549.1

547.1

545.1

543.1

541.1

539.1

537.1

535.1

533.1

531.1

S-48

S-49

S-50

S-51

S-52

S-53

S-54

S-55

S-56

S-57

S-58

SPT Sampler auger advancement: 5 min.

SPT Sampler auger advancement: 3 min.

SPT Sampler auger advancement: 1.05 min.

SPT Sampler auger advancement: 2 min.

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler

SPT Sampler auger advancement at SPT refusal

164.33

162.50

161.79

539.1

533.1

530.8

106.0

112.0

114.3

H ig hl y

W ea th er ed M od er at el y W ea th er ed

32.31

34.14

34.85

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

645.1 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 147,996 Y = 262,368

GDPR18-CB-05

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-21

50/2"

50/3"

50/2"

50/5"

50/2"

100/2"

100/4"

100/4"

100/3"

80/6" greenish gray

LIMESTONE, fitm, mostly silt, some carbonate fine to coarse-grained sand-sized, moist

SILTSTONE, slightly weathered, mostly silt (marl), limestone layer

0.12 ft. (0.4 m) thick, N 8/ white At El. 527.0 Ft.

LIMESTONE, mostly clay, few limestone fine to coarse-grained sand sized, 10YR 7/2 light gray

SILTSTONE, firm, mostly (marl), trace carbonate fine to coarse-grained sand-sized, little clay, moist, 10GY 6/1 greenish gray

LIMESTONE, non-fossiliferous, highly weathered, 10YR 7/3 very pale brown

SILTSTONE, firm, mostly (marl), trace carbonate fine to coarse-grained sand-sized, little clay, moist, 10GY 6/1 greenish gray CLAY, lean, firm, mostly clay, few silt, moist, 10GY 6/1 greenish gray

(CL)

At El. 512.9 Ft., soft, little sand to gravel-sized limestone, wet, 10GY 8/1 light greenish gray At El. 511.1 Ft., firm, trace silt, moist, mottled greenish gray and

529.1

527.1

525.1

523.1

521.1

519.1

517.1

515.1

513.1

511.1

S-58

S-59

S-60

S-61

S-62

S-63

S-64

S-65

S-66

S-67

S-68

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 2.25 min.

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 4.75 min.

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 9.75 min.

SPT Sampler auger advancement: 8.75 min.

161.28

160.67

159.45

158.84

156.99

156.59

156.37

529.1

527.1

523.1

521.1

515.1

513.7

513.0

116.0

118.0

122.0

124.0

130.1

131.4

132.1

H ig hl y

W ea th er ed S lig ht ly W ea th er e d H ig hl y W ea th er ed

35.36

35.97

37.19

37.80

39.65

40.05

40.27

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

645.1 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 147,996 Y = 262,368

GDPR18-CB-05

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-22

50/1"

60/6"

80/6"

90/6"

50/1"

50/2"

50/2" grayish green

At El. 509.1 Ft., few sand to gravel-sized limestone CLAY, lean, mostly clay, some silt, few sand to gravel-sized limestone, moist (CL)

At El. 502.9 Ft., moist, limestone (skeletal packestone), recrystallization observed, 10GY 6/1 greenish gray At El. 502.5 Ft., mostly clay, little silt, mottled light greensig gray, 10GY 6/1 greenish gray At El. 500.8 Ft., limestone (skeletal packestone), 10GY 6/1 greenish gray At El. 500.5 Ft., limestone (skeletal packestone), 10GY 6/1 greenish gray CLAY, lean, firm, some silt, mottled greenish gray, 10G 5/1 greenish gray

(CL)

CLAYSTONE, non-fossiliferous, highly weathered, 5GY 3/1 very dark greenish gray

NOTES:

1. USACE Jacksonville is the custodian for these original files.

2. Soils are field visually classified in accordance with the Unified Soils Classification System.

3. No circulation fluid was used.

4. R=refusal

5. XYZ locations collected using hand-held gps.

509.1

507.1

505.1

503.1

501.1

499.1

497.1

495.1

S-68

S-69

S-70

S-71

S-72

S-73

S-74

S-75

140# hammer w/30" drop used with 2.0' split spoon (1-3/8" I.D.

x 2" O.D.).

SPT Sampler auger advancement: 8.75 min.

SPT Sampler auger advancement: 8.75 min.

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 4.5 min.

SPT Sampler auger advancement at SPT refusal

45.72

155.15

152.14

151.53

509.0

499.1

497.1

495.1 150.0

136.1

146.0

148.0

S lig ht ly

W ea th er e d

H ig hl y

W ea th er ed

41.49

44.50

45.11

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

645.1 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 147,996 Y = 262,368

GDPR18-CB-05

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

Guajataca Dam

00 31 32-23

100/6"

60/3"

50/5"

50/5"

50/1"

FILL, clayey, some fine to coarse gravel-sized limestone, little organic matter, few fine to coarse-grained sand-sized carbonate, 10YR 4/4 dark yellowish brown

At El. 630.9 Ft., 10YR 8/8 yellow

At El. 628.9 Ft., little sand to gravel-sized limestone, 10YR 6/4 light yellowish brown

FILL, sandy, mostly fine to coarse-grained sand-sized limestone, some angular fine to coarse gravel-sized limestone, 2.5Y 9/2 very pale yellowish white At El. 626.8 Ft., very hard

LIMESTONE, sparsely fossiliferous, very hard, slightly weathered SILTSTONE, some layering

632.9

630.9

628.9

626.9

624.9

622.9

620.9

618.9

S-1

S-2

S-3

S-4

S-5

S-6

S-7

S-8

SPT Sampler

SPT Sampler

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advanvement: 30.5 min

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 1.5 min run

SPT Sampler auger advancement at SPT refusal

SPT Sampler

0.00192.91192.91

191.08

188.64 188.60

632.9632.9

626.9

618.9 618.8

0.0

6.0

14.0 14.1

0.0 0.00

1.83

4.27 4.31

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

MANUAL HAMMER

DRILLING LOG

CONTRACTOR FILE NO.

11. MANUFACTURER'S DESIGNATION OF DRILL

COMPLETED

18. SIGNATURE AND TITLE OF INSPECTOR

VERTICAL

INCLINED

DIVISION INSTALLATION

VERTICAL

14. ELEVATION GROUND WATER

HORIZONTAL

1. PROJECT

15. DATE BORING

7. DEPTH DRILLED INTO ROCK

2. BORING DESIGNATION

STARTED

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

Boring Designation

17. TOTAL RECOVERY FOR BORING

10. COORDINATE SYSTEM/DATUM

OF

GDPR18-CB-06

UNDISTURBED (UD)

16. ELEVATION TOP OF BORING

BEARING

8. TOTAL DEPTH OF BORING

SHEETS

5. DIRECTION OF BORING

DISTURBED

DEG. FROM

VERTICAL

SHEET

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

GDPR18-CB-06

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

MVG, Inc.

Jacksonville District

02-06-18

South Atlantic

NAD83

See Remarks

State Plane, PR/VI (M) PRVD02

Mobile B61 HDX

Guajataca Dam IRRM

Spillway

N/A

N/A

Eric García

02-12-18

144 %

Rafael Morales, Geologist

X = 148,005 Y = 262,418

600.9 Ft.

632.9 Ft.

130.0 Ft.

SAJ FORM 1836

JUN 02

(Continued)

Guajataca Dam

00 31 32-24

50/5" observed

LIMESTONE, sparsely fossiliferous, slightly weathered, some recrystallization observed

SILTSTONE, moderately weathered, mostly marl (silt), 10YR 8/4 very pale brown

CLAY, lean, medium plasticity, soft, little fine to coarse gravel-sized marl and limestone, few silt, few clay, moist, 10YR 7/6 yellow (CL)

At El. 610.9 Ft., trace fine to coarse gravel-sized limestone, mottled light gray and light brown, 10YR 7/1 light gray LIMESTONE, moderately weathered, brittle CLAY, lean, medium plasticity, soft, trace fine to coarse gravel-sized limestone, mottled light gray and light brown, 10YR 7/1 light gray (CL) LIMESTONE, slightly weathered, slightly porous, partially recrystallized, 10YR 8/4 very pale brown CLAY, lean, medium plasticity, wet, 10YR 7/4 very pale brown (CL) At El. 608.2 Ft., hard, some sand to gravel-sized to trace limestone, mottled light gray and light brown, 10YR 6/6 brownish yellow At El. 608.0 Ft., moist, 10YR 4/3 brown At El. 606.9 Ft., firm, 10YR 5/3 brown At El. 606.8 Ft., hard, few silt, 10YR 6/6 brownish yellow LIMESTONE, moderately weathered, brittle, 10YR 8/4 very pale brown At El. 605.7 Ft., 10YR 6/6 brownish yellow At El. 604.9 Ft., 10YR 8/3 very pale brown CLAY, lean, firm, little fine to coarse gravel-sized limestone, few fine to coarse gravel-sized limestone, wet, 10YR 8/4 very pale brown (CL) CLAY, lean, firm, mostly marl (silt), few fine to coarse-grained sand-sized carbonate, moist, mostly marl (silt), 10YR 7/2 light gray (CL) At El. 603.9 Ft., limestone layer 0.1 ft (0.03 m) thick, moderately weathered, brittle, 10YR 8/4 pale

616.9

614.9

612.9

610.9

608.9

606.9

604.9

602.9

600.9

598.9

S-8

S-9

S-10

S-11

S-12

S-13

S-14

S-15

S-16

S-17

S-18

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

188.00

187.70

186.81

185.87 185.81 185.75 185.60

184.68

184.33

184.07

183.58

182.43

616.8

615.8

612.9

609.8 609.6 609.4 608.9

605.9

604.8

603.9

602.3

598.5

16.1

17.1

20.0

23.1 23.3 23.5 24.0

27.0

28.2

29.0

30.6

34.4

S lig ht ly

W ea th er e d

S l.

W ea

M od er at el y W ea th er ed

M S

W M od

W ea

M od

W ea

M od er at el y W ea th er ed

4.91

5.22

6.10

7.04 7.10 7.16 7.32

8.23

8.58

8.84

9.33

10.49

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

632.9 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 148,005 Y = 262,418

GDPR18-CB-06

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-25

50/5"

50/6"

50/6"

50/6" brown, 7.5YR 9/2 Pale Brown At El. 602.9 Ft., little fine to coarse-grained sand-sized limestone & marl, little silt, few fine to coarse gravel-sized limestone, wet, 10YR 8/2 very pale brown SILT, inorganic-L, mostly silt, some sand to gravel-sized limestone, little clay, moist, mottled light gray and light brown, 7.5YR 9/2 Pale Brown

(ML)

At El. 600.9 Ft., trace fine to coarse-grained sand-sized carbonate At El. 598.9 Ft., wet, SM, silty sand, mostly limestone fine to coarse-grained sand sized, 10YR 8/3 very pale brown LIMESTONE, fossiliferous, moderately weathered, fenestral porosity observed, slightly recrystallized, 10YR 7/6 yellow At El. 596.9 Ft.

SILTSTONE, mostly marl (silt), 7.5YR 9/2 Pale Brown CLAY, lean, hard, mostly sand to gravel-sized limestone, little silt, trace sand to gravel-sized limestone, moist, 10YR 8/1 white (CL)

At El. 584.9 Ft., some clay, wet, 10YR 8/1 white At El. 584.6 Ft., firm, moist, mottled tannish white to light brown, 10YR 8/3 very pale brown

At El. 582.9 Ft., wet, 10YR 8/1 white At El. 582.6 Ft., moist, mottled tannish white to light brown

SILT, inorganic-L, some clay, trace fine to coarse gravel-sized limestone, moist, 10YR 8/1 white

(ML)

CLAY, lean, firm, mostly fine to coarse gravel-sized limestone, some silt, some clay, wet, mottled tannish white to light brown, 10YR 8/1 white

(CL)

SILT, inorganic-L, some clay, trace fine to coarse gravel-sized limestone, moist, 10YR 8/1 white

(ML)

596.9

594.9

592.9

590.9

588.9

586.9

584.9

582.9

580.9

578.9

S-18

S-19

S-20

S-21

S-22

S-23

S-24

S-25

S-26

S-27

S-28

SPT Sampler

SPT Sampler

SPT Sampler auger advancement at SPT refusal

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler

SPT Sampler

181.14

180.02

177.34

177.06

176.73

176.45

594.3

590.6

581.8

580.9

579.8

578.9

38.6

42.3

51.1

52.0

53.1

54.0

M od er at el y

W ea th er ed M od er at el y W ea th er ed

S lig ht ly

W ea th er e d

11.77

12.89

15.57

15.85

16.18

16.46

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

632.9 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 148,005 Y = 262,418

GDPR18-CB-06

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-26

50/6"

50/5"

50/5"

50/5"

50/4"

50/3"

CLAY, lean, little sand to gravel-sized limestone, moist, mottled light brown and gray, 10YR 6/8 brownish yellow (CL) At El. 576.9 Ft., mottled light brown and greenish gray

At El. 576.0 Ft., few coarse-grained sand-sized oxides

SILTSTONE, thin bedding, flat bedding orientation, mostly silt (marl), mottled greenish gray and brown

LIMESTONE, N 7/ light gray SILTSTONE, slightly weathered, mostly silt (marl), N 7/ light gray

CLAY, lean, firm, some marl (silt), dry, 10YR 5/4 yellowish brown (CL)

LIMESTONE, mostly limestone fine to coarse gravel-sized, few clay, trace silt

CLAY, lean, some marl (silt) (CL) LIMESTONE, mostly limestone fine to coarse gravel-sized, some silt, 576.9

574.9

572.9

570.9

568.9

566.9

564.9

562.9

560.9

558.9

S-28

S-29

S-30

S-31

S-32

S-33

S-34

S-35

S-36

S-37

S-38

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler

SPT Sampler

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

173.93

173.40 173.34

172.74

170.87

170.36 170.30 170.20

570.6

568.9 568.7

566.7

560.6

558.9 558.7 558.4

62.3

64.0 64.2

66.2

72.3

74.0 74.2 74.5

S lig ht ly

W ea th er e d

18.98

19.51 19.57

20.17

22.04

22.56 22.61 22.71

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont. Sheet)

ELEVATION TOP OF BORING

Boring Designation

Guajataca Dam IRRM

632.9 Ft.

State Plane, PR/VI (M)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 148,005 Y = 262,418

GDPR18-CB-06

NAD83 PRVD02

SAJ FORM 1836-A

JUN 02

(Continued)

Guajataca Dam

00 31 32-27

50/5"

50/6"

50/4"

50/6"

50/3"

50/3"

50/5" some clay CLAY, lean, firm, some marl (silt), some silt (marl) (CL) At El. 556.9 Ft., moist CLAY, organic-L, 10YR 2/1 black

(OL)

CLAY, lean, few fine to coarse gravel-sized limestone, 10GY 4/1 dark greenish gray (CL)

LIMESTONE, mostly limestone fine to coarse gravel-sized, few clay, trace silt, N 7/ light gray

CLAY, lean, few fine to coarse-grained sand-sized carbonate, few organic matter, 10GY 4/1 dark greenish gray (CL) At El. 552.4 Ft., trace fine to coarse gravel-sized limestone, discontinue organic matter, N 7/ light gray

LIMESTONE, moderately weathered, mostly limestone fine to coarse gravel-sized, few clay, trace silt

CLAY, lean, few fine to coarse-grained sand-sized carbonate, moist, N 7/ light gray

(CL)

LIMESTONE, moderately weathered

At El. 544.9 Ft., fossiliferous, miocerite sp. observed; skeletal packestone, greenish gray

CLAY, lean, few fine to coarse gravel-sized limestone, mottled green gray and gray (CL) At El. 540.6 Ft., discontinue mottle with gray

CLAY, lean, some sand to gravel-sized limestone, mostly limestone fine to coarse gravel-sized, few clay, trace silt (CL)

556.9

554.9

552.9

550.9

548.9

546.9

544.9

542.9

540.9

538.9

S-38

S-39

S-40

S-41

S-42

S-43

S-44

S-45

S-46

S-47

S-48

SPT Sampler auger advancement at SPT refusal

SPT Sampler

SPT Sampler

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement: 40.5 min

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

SPT Sampler auger advancement at SPT refusal

169.64 169.64

169.08

168.59

167.92

167.12

166.70

165.02

164.42

556.6 556.6

554.7

553.1

550.9

548.3

546.9

541.4

539.4

76.4 76.4

78.2

79.8

82.0

84.6

86.0

91.5

93.5

M od er at el y

W ea th er ed M od er at el y W ea th er ed

23.27 23.27

23.83

24.32

24.99

25.79

26.21

27.89

28.49

CLASSIFICATION OF MATERIALSDEPTH

(ft)

ELEV.

(m)

N -V

A L

U E

B L

O W

S

.5

F T

REMARKS

RQD

OR

UD

L E

G E

N D

REC.

B O

X O

R S

A M

P L

E

ELEV.

(ft)

DEPTH

(m)

INSTALLATION

LOCATION COORDINATES

COORDINATE SYSTEM/DATUMPROJECT HORIZONTAL

OFDRILLING LOG (Cont.