Appendix A Exploratory Borings and Test Pits

Transcription

1 Appendix A Exploratory Borings and Test Pits

2

3 Appendix A Exploratory Borings and Test Pits This appendix describes the methods used for the field investigations and presents the results of the investigations. The explorations described in this section were conducted in accordance with the methods presented in the Geotechnical Investigation Work Plans prepared for the project (URS, 8). A. CORE BORING LOGS Two HQ- wireline core borings (hole diameter of.8 inches and core diameter of. inches) were drilled on the ridge separating the Carmel River from San Clemente Creek as shown on Figure -. The borings were drilled between September and 9, 8 and ranged in depth from to below ground surface (bgs). Both boring CB- and CB- were drilled vertically. A summary of core borings is presented in Table - of the main text. The borings were drilled with an LF- drill rig that was transported to the site with a helicopter. The helicopter also transported all pumps, drill rods and other equipment needed for the drilling operation. Water for drilling was pumped to the site through a -inch flexible line laid on the ground surface between the drill site and the Carmel River. Core drilling was initiated at the ground surface and then a.-inch diameter HW steel casing was advanced through the overburden to prohibit any caving within the weathered zone. The surface casing was sealed in place by placing bentonite in the annular space around the top of the casing. Rock coring was performed using an HQ- diamond impregnated drill bit (.8-inch outside diameter). The core samples were recovered using a HQ- wireline triple tube core barrel. The recovered cores were photographed and logged in the field. Field descriptions included rock type and degree of weathering, discontinuity characteristics, fracture locations and frequency, and rock quality designation (RQD). After logging, the core samples were placed in wooden core boxes for transport and are presently stored in the metal shed located next to San Clemente Dam. The field logs were reviewed by a senior engineering geologist and the core boxes photographed. During the review samples were taken for laboratory testing. After the completion of downhole geophysical logging in CB- and CB-, one Geokon, Inc. Series S vibrating wire piezometer was installed at a depth of in boring CB-. The VWP was installed in a neat cement grout tremied to the surface of the boring. Boring CB- was backfilled with neat cement grout tremied to the surface. A Key to Log of Borings is presented on Figure A-. The Core Boring Logs are presented on Figures A- and A-. A. ROTARY WASH BORING LOGS Five rotary wash borings having a total footage of 9. were drilled in the alluvial channel of Carmel River to investigate soil and groundwater conditions at the diversion dike and stabilized sediment slope areas. The locations of the borings are shown in Figure -. These borings were drilled by Pitcher Drilling of East Palo Alto, CA between October, 8 and October 9, 8. A summary of core borings is presented in Table - of the main text. The borings were drilled to depths ranging from to 8. bgs using a Fraste Multi-Drill XL track-mounted drill rig. Soil samples were obtained using a modified California (MC) sampler and a Standard Penetration Test (SPT) sampler. The MC sampler had a nominal inside and X:\X_WATER\SAN CLEMENTE DAM REMOVAL - 88\GEOTECHNICAL\GDR REPORT\FIL_GDR MAY.DOC\-MAY-\\ A-

4

5 Appendix A Exploratory Borings and Test Pits The soils were classified as they were encountered during excavation and samples were transported to the laboratory for analysis. Test pit logs were prepared based on the field logs and laboratory test results and are presented on Figures A-9 and A-. A. GROUNDWATER LEVEL MEASUREMENTS Groundwater level information was collected during drilling of core borings, rotary wash borings and test pit excavations. If a boring was drilled over the course of two or more days, an attempt was made to measure the groundwater level each morning before drilling was resumed. These readings may not reflect a state of equilibrium due to the short interval of time allowed for recovery and the presence of drilling fluids. The groundwater level in a test pit was measured from the top of the pit during excavation if free water associated with groundwater was observed. Results of the water level readings obtained during drilling are shown on the boring logs presented in this appendix. In addition, Table - in the text of the report presents the results of readings obtained during drilling and from the vibrating wire piezometer installed in boring CB-. X:\X_WATER\SAN CLEMENTE DAM REMOVAL - 88\GEOTECHNICAL\GDR REPORT\FIL_GDR MAY.DOC\-MAY-\\ A-

6

7 Appendix A- Exploratory Borings

8

9 Project : 88. Key to Log of Soil / Core Boring Sheet of SOIL SAMPLES s Blows / foot Recovery, % AND TEST RESULTS 8 9 COLUMN DESCRIPTIONS 8 Elevation: Depth: : Elevation (in ) referenced to mean sea level (MSL). Distance (in ) below the collar of the borehole. of the individual coring interval. : of the core box which contains core from the corresponding run. Recovery: Amount (in percent) of core recovered from coring interval; calculated as length of core recovered divided by run length. s : ( Frequency) The number of naturally occurring fractures in each foot of core; does not include mechanical breaks (induced by drilling) or healed fractures. "" indicates not applicable due to lack of core recovery. R Q D: (Rock Quality Designation) Amount (in percent) of intact core (pieces of sound core greater than inches in length) in each coring interval; calculated as the sum of lengths of intact core divided by length of core run. RQD of weathered/altered rock that does not meet soundness requirements is marked with asterisk; it provides some indication of rock quality with respect to degree of fracturing. : Sketch of the naturally occurring fractures and mechanical breaks, showing the angle of the fractures relative to the cross-sectional axis of the core. "" indicates no recovery. 9 : Location of each naturally occurring fracture (numbered) and mechanical break (labeled "M"). Naturally occurring fractures may be described in Column (keyed by number) using descriptive terms defined on Sheet (Items a through g). : A graphic log of material encountered using symbols to represent differing soil and rock types; see graphic symbols below. Description: Lithologic description in this order: rock type, color, grain size, texture, weathering, strength, and other features; descriptive terms are defined on Sheet. A detailed description of overburden material is not necessarily provided. Also, abbreviated description of fractures numbered in Column 9 using terms defined on Sheet. Sample : of soil sample collected at depth interval shown; sampler symbols are explained below. Sample : Sample identification number. Blows / foot: of blows to advance driven sampler inches beyond the first -inch interval, or distance noted, using a -lb hammer with a -inch drop. Recovery: Amount (in percent) of sample recovered from interval over which drive sampler was driven. Field Notes and Lab Tests: Comments and observations regarding drilling or sampling made by driller or field personnel. Field and laboratory tests are indicated using abbreviations explained below. TYPICAL MATERIAL GRAPHIC SYMBOLS POORLY GRADED SAND (SP) SILTY SAND (SM) ORGANIC SILT (OL) PEAT (PT) Report: GEO_CORE+SOIL_NIT_NWKEY; File: OAK_SCLEMDAM.GPJ; //8 sclemkey POORLY GRADED GRAVEL WITH SAND (GP) OTHER GRAPHIC SYMBOLS First water encountered at time of drilling Inferred or transitional contact WELL-GRADED GRAVEL WITH SAND (GW) DIORITE FIELD AND LABORATORY TEST ABBREVIATIONS LL: PI: SA: HD: UCS: DUW: WC: GRANODIORITE Liquid Limit (from Atterberg Limits) Plasticity Index (from Atterberg Limits), NP=nonplastic Sieve analysis, % fines (<#) Hydrometer analysis, % finer than microns Rock unconfined compressive strength, q u [psi] Dry unit weight [pcf] Water content [%] Static water level measured after drilling completed Change in material properties within a stratum GRANITE DIORITIC GNEISS TYPICAL SAMPLER GRAPHIC SYMBOLS SPT split spoon GENERAL NOTES GRANITIC GNEISS Modified California with brass liners EXTENSIVE SHEAR ZONE or CLAY SHEAR. Soil classifications are based on the Unified Soil Classification System. Descriptions and stratum lines are interpretive; actual lithologic changes may be gradual. Field descriptions may have been modified to reflect results of lab tests.. Descriptions on these logs apply only at the specific boring locations and at the time the borings were advanced. They are not warranted to be representative of subsurface conditions at other locations or times. Figure A-

10 Project : 88. Key to Log of Soil / Core Boring Sheet of KEY TO DESCRIPTIVE TERMS USED ON CORE LOGS DISCONTINUITY DESCRIPTORS a Dip of discontinuity, measured relative to a plane normal to the core axis. b Discontinuity : e Amount of Infilling: g Roughness of Surface: c F - Fault J - Joint Sh - Shear Fo - Foliation V - Vein B - Bedding Aperture (inches): W - Wide (.-.) MW - Moderately Wide (.-.) N - Narrow (.-.) VN - Very Narrow (<.) T - Tight () f Su Sp Pa Fi No - Surface Stain - Spotty - Partially Filled - Filled - None Surface Shape of Joint: Pl - Planar Wa - Wavy St - Stepped Ir - Irregular Slk S SR R VR - Slickensided [surface has smooth, glassy finish with visual evidence of striations] - Smooth [surface appears smooth and feels so to the touch] - Slightly Rough [asperities on discontinuity surfaces are distinguishable and can be felt] - Rough [ridges and side-angle steps are evident; asperities are clearly visible; surface feels very abrasive] - Very Rough [near-vertical steps and ridges occur on discontinuity surface] d of Infilling: Bi Cl Ca Ch Ep Fe H Mn - Biotite - Clay - Calcite - Chlorite - Epidote - Iron Oxide - Healed - Manganese My No Py Qz Sd Se Si Uk - Mylonite - None - Pyrite - Quartz - Sand - Serpentinite - Silt - Unknown ROCK FRACTURING Description Intensely d Highly d Moderately d Slightly d Massive Recognition s spaced less than inches apart s spaced inches to foot apart s spaced foot to apart s spaced to apart spacing greater than Report: GEO_CORE+SOIL_NIT_NWKEY; File: OAK_SCLEMDAM.GPJ; //8 sclemkey ROCK WEATHERING / ALTERATION Residual Soil Description Completely Weathered/Altered Highly Weathered/Altered Moderately Weathered/Altered Slightly Weathered/Altered Fresh/Unweathered ROCK STRENGTH Description Extremely Weak Rock Very Weak Rock Weak Rock Moderately Strong Rock Strong Rock Very Strong Rock Extremely Strong Rock Recognition Original minerals of rock have been entirely decomposed to secondary minerals, and original rock fabric is not apparent; material can be easily broken by hand Original minerals of rock have been almost entirely decomposed to secondary minerals, although original fabric may be intact; material can be granulated by hand More than half of the rock is decomposed; rock is weakened so that a minimum -inch-diameter sample can be broken readily by hand across rock fabric Rock is discolored and noticeably weakened, but less than half is decomposed; a minimum -inch-diameter sample cannot be broken readily by hand across rock fabric Rock is slightly discolored, but not noticeably lower in strength than fresh rock Rock shows no discoloration, loss of strength, or other effect of weathering/alteration Recognition Can be indented by thumbnail Can be peeled by pocket knife Can be peeled with difficulty by pocket knife Can be indented mm with sharp end of pick Requires one hammer blow to fracture Requires many hammer blows to fracture Can only be chipped with hammer blows Approximate Uniaxial Compressive Strength (psi) - - -,, -,, -,, -, >, Figure A-

11 Project : 88. Log of Core Boring CB- Sheet of 8 Date(s) Drilled Drilling Method Drill Rig Location GPS Location 9//8-9//8 HQ- Wireline Core (triple tube) Longyear LF- (heli-portable) Ridge top - bypass channel N.9 W.8 Logged By Drill Bit Size/ Drilling Contractor Groundwater Level Borehole Completion S. Janowski HQ- diamond-impregnated Series bit Ruen Drilling Company 9. bgs on 9//8 ATD;. bgs on 9//8 Backfilled with neat cement grout on 9//8 Checked By M. Schmoll Total Drilled Depth/Length. Approx. Ground Surface Elevation Inclination from Horizontal/Bearing 9 (vertical) s SILTY GRAVEL WITH SAND, COBBLES, AND BOULDERS (GM), granite and granodiorite clasts to inches in silty sand matrix (washed out), subrounded to rounded clasts, occasionally subangular, iron oxide staining on surfaces, aphanitic and phaneritic with salt and pepper flecks [Terrace Deposits] UCS, psi Drill Time, -hr [Drill Rate, ft/hr] 8 [] AND OTHER TESTS Start coring from ground surface on 9//8. No core recovery.-. ft [] No core recovery.-. ft. 8 8 [] No core recovery.-. ft. 8 8 Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB Granitic boulder [] No core recovery ft. 8 Set casing to ft 9 after Run. No core recovery.-. ft. [8] Figure A-

12 Project : 88. Log of Core Boring CB- Sheet of 8 s SILTY GRAVEL WITH SAND, COBBLES, AND BOULDERS (GM), granite and granodiorite clasts to inches in silty sand matrix (washed out), subrounded to rounded clasts, iron oxide staining on surfaces [Terrace Deposits] (continued) GRANITE, grayish orange to pale yellowish brown, medium-grained, completely weathered, very weak, friable, intensely fractured, crumbles to silty sand, weak gneissic fabric dips UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [8] 9 98 AND OTHER TESTS No core recovery.-. ft. Darker, moderate yellowish brown zone dips, less quartz [] 8 Darker, moderate yellowish brown zone dips, less quartz 9 Becomes completely to highly weathered, low hardness, intensely fractured but mostly healed joints 9 Set casing to ft 9 after Run. : 8, J, N, H+Fe+Qz, Su-Fi, Pl :, J, N, Fe, Su, Wa, R 9 [] 98 Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > > > *,,, :, J, VN, Mn, Su, Pl, S Becomes very light gray (quartz-rich), moderately weathered, strong, hard, intensely fractured, extensive iron oxide staining along joints :, J, T, H+Fe, Su, Pl : -, J, VN, Fe, Su, Pl, S :, J, VN, Fe, Su, Pl, S :, J, VN, No-Fe, No-Su, Pl, S :, J, N, Fe+Mn, Su, Pl, SR [] No core recovery.-. ft. Asterisk indicates rock does not meet RQD soundness criteria. No core recovery ft. Figure A-

13 Project : 88. Log of Core Boring CB- Sheet of s > GRANITE, very light gray, medium-grained, moderately weathered, strong, hard, intensely fractured, extensive iron oxide staining along joints, quartz-rich (continued) UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [8] AND OTHER TESTS 88 8 > 9*, Lighter colored zone dips :, J, N, Fe, Su, Wa, R :, J, N, Fe, Su, Wa, R :, J,?, Fe, Su, Pl, SR : 8, J, VN-N, Fe+Mn, Su, Wa, SR-R Becomes hydrothermally altered, weak, moderately hard :, J, N, Fe, Su, Wa, SR : -9, J, VN, Fe, Su, St, R-VR : 8, J, MW, Mn, Su, Wa, SR Becomes very weak, friable Becomes yellowish gray, completely altered, low hardness [] :, J, T, Fe, Su, Pl, SR 8 Becomes dark gray, aphanitic, slightly weathered, strong, hard, highly fractured; end of hydrothermally altered zone :, J, N, Fe, Su-Sp, Pl, SR [] Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > > * : 9, J, N, Fe+Mn+crushed rock, Su-Fi, Wa, R : -, Fo, N-MW, H+No, No, Pl, :, J, N, Fe, Su-Sp, Pl, SR :, V, N, Qz, Fi, Pl, SR :, J, VN, Fe+Cl, Su-Sp, Wa, S Becomes moderately weathered :, J, N, Fe, Su, Wa, R :, J, VN, Fe, Su, Wa, R Intensely fractured Weak gneissic foliation dips to :, J, VN, Fe, Su, Pl, R :, V, N, Fe+Qz, Su-Fi, Pl, SR :, J, VN, Fe+Mn, Su, Pl, SR Becomes highly weathered, weak, intensely fractured, iron oxide-stained [] [8] Figure A-

14 Project : 88. Log of Core Boring CB- Sheet of 8 s > GRANITE, dark gray, aphanitic, highly weathered, weak, hard, intensely fractured, weak gneissic foliation dips to (continued) UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [8] AND OTHER TESTS > > > > > *,,,,,,,,,,, GRANITIC GNEISS, dark gray, highly weathered/altered, extremely to very weak, friable, intensely fractured, strong gneissic foliation :, Fo, N-W, No, No, Pl, SR Weaker foliation :, J, T, Fe, Su, Pl, S-SR :, V, T, H+Fe+Qz, Su-Fi, Pl :, Fo, T, No, No, Pl, S (friable) :, Fo, W, Fe+crushed rock, Su-Fi, Pl, SR :, V, VN-N, H+Qz, Fi, Pl Porphyritic, moderately weathered, with phenocrysts of quartz and feldspar :, V, T, H+Fe+Qz, Su-Fi, Pl :, J, T-N, Fe, Su, Pl, S-SR [] [9] Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB- 8 9 * *,,, M :, Fo, T, Fe+Mn, Su, Pl, SR :, Fo, MW, H+No, No, Pl DIORITE, dark gray, highly weathered/altered, extremely to very weak, friable, highly fractured, weak gneissic fabric dips, occasional quartz phenocrysts :, J, T, No, No, Pl, SR :, J, T, No, No, Pl, SR :, J, N, No, No, Wa, R Becomes moderately weathered, weak to moderately strong, micaceous : 8, Fo, T, Si, Fi, Pl, S : -, J, N, No, No, St, VR QUARTZ PEGMATITE GRANITIC GNEISS, highly weathered/altered [see next sheet] 8 [] [] Figure A-

15 Project : 88. Log of Core Boring CB- Sheet of 8 8 s > > * GRANITIC GNEISS, light gray, highly weathered/altered, very weak, friable, highly to locally intensely fractured, fractures partially healed Becomes hydrothermally altered, weak to moderately strong, intensely fractured :, Fo, MW, crushed rock, Fi, Wa, S UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [] AND OTHER TESTS > >,, : -9, J, T, Fe, Su-Sp, Wa, SR : -, J, T, No, No, Wa, S : -, J, T, H+No, No, Wa :, Fo, N-MW, H+No, No, Pl QUARTZ PEGMATITE, very light gray, intensely fractured 8 > * M Intensely fractured :, Fo, N, No, No, Pl, SR :, V, N, Fe+Qz, Su-Fi, Pl, SR :, J, N, No, No, Wa, SR [] Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > >, :, J, T, Fe, Su, Wa, SR DIORITE, medium dark gray, medium-grained, salt and pepper texture, slightly weathered, strong, hard, highly to locally intensely fractured : -, J,?, No-Fe, No-Su, Pl, SR : 8, J, T, Fe, Su, Pl, S-SR : -, J, T, Fe+Mn, Su, Pl-Wa, SR :, J, VN, Fe, Su, Wa, SR :, J, T, Fe, Su, Wa, SR Fine-grained :, J, VN, Fe, Su, Wa, SR :, J, N, Fe, Su, Wa, S-SR :, J, VN, Fe, Su, Wa, SR :, J, N, Fe, Su, Pl, SR GRANITIC GNEISS, medium light gray, slightly weathered, strong, hard, highly fractured :, Fo, T-VN, No, No, Pl, S-SR Clayey zone dips, extremely weak 9 [] 8 [] [] Figure A-

16 Project : 88. Log of Core Boring CB- Sheet of s > > > > > 9 M,,, GRANITIC GNEISS, slightly weathered, strong, hard (continued) Becomes medium gray, salt and pepper texture, moderately weathered, very weak to weak, intensely fractured :, Fo, VN-N, Fe+Si, Su-Fi, Pl, S :, J, N, Fe+Si, Su-Fi, Pl, S :, J, VN, Fe, Su, Pl, S :, J, VN, Fe, Su, Pl, S : -, Fo, VN, No, No, Pl, R :, J, N, Mn, Su, Pl, SR Completely weathered, extremely weak :, J, N, No, No, Wa, S UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [] 8 [8] [] AND OTHER TESTS : 9, J,?, No, No, Pl, R Becomes slightly weathered, strong, hard, highly to locally intensely fractured, weaker foliation 8 :, J, VN-N, Fe, Su, St, R :, J, N, Fe, Su, Wa, SR :, J, VN, Fe, Su, Wa, SR Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > 8 > > > 8,, M M, M M :, J, VN, Fe, Su, Wa, SR :, J, N, Fe, Su, Pl, SR :, J, VN, Fe, Su, Pl, SR DIORITE, medium dark gray, medium-grained, salt and pepper texture, slightly weathered, strong, hard, intensely fractured :, J, N, No, No, Pl-Wa, SR-R :, J, N, No, No, Wa, SR-R :, J, VN, No, No, Wa, SR :, J, W, Cl+Sd+crushed rock, Fi, Pl, SR : 8, J, VN, Fe+Mn, Su, Wa, SR :, Fo, MW, No, No, Wa, SR :, J, VN, No, No, Wa, SR :, J, MW-W, Cl+Sd, Fi, Pl, S :, J, W, Cl+Sd, Fi, Pl, S :, J, VN, Fe, Su, Wa, SR [] 8 [] [] Casing falls into hole; try without success to add ft. Figure A-

17 Project : 88. Log of Core Boring CB- Sheet of s 8 8,, DIORITE, medium dark gray, medium-grained, salt and pepper texture, slightly weathered, strong, hard, intensely to highly fractured (continued) :, J, N, Fe+Sd, Su-Sp, Pl, R :, J, VN, Fe, Su, Pl, R : 8, J, VN, Fe, Su, Pl, R :, J, W, Fe+crushed rock, Su-Fi, St, R UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [] AND OTHER TESTS 9 8 M , :, J, VN, Fe, Su, Wa, SR QUARTZ dike : -, J, N, No, No, Pl, SR :, J,?, Fe, Su, Pl, SR [] 8 Set casing to ft after Run 8. > 99 9 > :, J, N, No, No, Pl, R :, J, N, No, No, Pl, R [] Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > > > > 9,, M, M :, J, N, Fe, Su, Pl, SR :, J, VN, Fe, Su, Wa, R :, J, N, Fe, Su, Pl, R DIORITIC GNEISS, medium dark gray, fine- to medium-grained, salt and pepper texture, slightly weathered, strong, hard, intensely to highly fractured, foliated :, J, VN, Fe, Su, Pl, R : -, Fo, N, No-Sd, No-Fi, Pl, SR-R :, J, N, Fe, Su, Wa, R : -8, J, N, No, No, Wa, SR-R QUARTZ Dike, light gray, slightly weathered, strong, hard, intensely fractured, with granitic gneiss inclusions :, J, MW, No, No, St, VR : 8, J, VN, Fe, Su, Pl, SR : -8, J, VN-N, No, No, St, VR : 9, J, T, Fe+Mn, Su, Pl, S : 8, J, VN, Fe, Su, Pl, S :, J, MW, Fe, Sp, Wa, SR :, J, MW, Fe, Su-Sp, Wa, VR :, Fo,?, No, No, Pl, R :, J, MW, No, No, Ir, VR 8 8 [] 8 8 [] [] 89 8 [] End for 9//8. Resume coring on 9//8. Water level at 9. ft. WC=.% DUW=. pcf Figure A-

18 Project : 88. Log of Core Boring CB- Sheet 8 of s > 9 8 >,, 8 9 QUARTZ Dike, light gray, slightly weathered, strong, hard, intensely fractured, with granitic gneiss inclusions (continued) GRANITIC GNEISS, light gray, slightly weathered, strong, hard, highly to locally intensely fractured, quartz-rich :, Fo, VN-N, Fe, Su, Pl, SR :, J, T, Fe, Su, Pl, S Medium dark gray, fine-grained, mafic, micaceous Becomes very light gray, very felsic, occasional mafic foliation :, J, VN, Fe, Sp, Wa, SR-R :, Fo,?, Fe, Su, Wa, R : -, J, N, Fe, Su, Wa, VR :, J, N, Fe, Su, St, VR :, J, VN, Fe, Sp, Pl, SR 8:, J, VN, No, No, Wa, SR 9:, J, N, No, No, Wa, R UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [] 8 88 [] 9 99 AND OTHER TESTS Run box was dropped; core not intact in box. Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > > > M, M, M, 8 :, J, N, Fe, Sp, Pl, SR :, J, N, Fe, Su, Pl, R :, J, T, Fe, Sp, Wa, SR Increase in mafic content, salt and pepper texture :, Fo, T, No, No, Pl, R :, J, VN, Fe, Su, Wa, SR :, J, VN, Fe, Su, Wa, SR :, J, VN, No, No, Wa, SR 8:, Fo, VN, Fe, Su, Wa, SR 9: 9, J, VN-N, Fe, Su, Wa, R :, J, VN, No, No, Wa, SR : -, J, N, No-Fe, No-Su, Wa, R :, J, N, Fe, Su, Wa, R :, J, N, No, No, Wa, R QUARTZ :, J, VN, No, No, Wa, R :, Fo, N, No, No, Wa, R :, Fo, N, No, No, Pl, R-VR : 8, J, VN-N, No, No, Wa, R 8: 8, J, N, No, No, Wa, VR TOTAL DEPTH =. FEET At completion of drilling, casing was set to to keep hole open for caliper and televiewer logging and Oyo downhole testing, which were performed on 9//8. Borehole was then grouted to surface. [9] 9 9 [] 9 End coring 9//8. Set casing to ft to keep hole open for testing. Figure A-

19 Depth. to. Depth. to 9. Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS CB- - Box & Figure CB-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

20 Depth 9. to. Depth. to 9. Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS CB- - Box & Figure CB-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

21 Depth 9. to 8. Depth 8. to 9. Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS CB- - Box & Figure CB-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

22 Depth 9. to. Depth. to. Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS CB- - Box & 8 Figure CB-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

23 Project : 88. Log of Core Boring CB- Sheet of Date(s) Drilled Drilling Method Drill Rig Location GPS Location 9//8-9/9/8 HQ- Wireline Core (triple tube) Longyear LF- (heli-portable) Mid ridge - bypass channel N.9 W. Logged By Drill Bit Size/ Drilling Contractor Groundwater Level Borehole Completion S. Janowski HQ- diamond-impregnated Series 8 bit Ruen Drilling Company. bgs on 9/9/8 ATD; bgs on 9//8 (VWP test) Checked By Total Drilled Depth/Length Approx. Ground Surface Elevation Inclination from Horizontal/Bearing Vibrating wire piezometer grouted with tip set at M. Schmoll (vertical) 9 s SILTY SAND WITH GRAVEL, COBBLES, AND BOULDERS (SM), medium dense, moist, moderate yellowish brown, subrounded granitic clasts; most of sand washed out in first core run [Terrace Deposits] UCS, psi Drill Time, -hr [Drill Rate, ft/hr] 9 AND OTHER TESTS Start coring from ground surface on 9//8. No core recovery.-. ft. [9] Granitic boulder 9 [] 8 Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > > GRANITE, light gray, medium-grained, salt and pepper texture, moderately weathered, strong, moderately hard, intensely fractured, sand and iron oxide staining between joints : -, J, W, Sd+crushed rock, Fi, Pl, VR :, J, VN, Fe+Mn, Su, Pl, SR Moderate yellowish brown, completely weathered, extremely weak, clayey GRANITIC GNEISS, medium gray, fine-grained, highly weathered, weak, moderately hard, intensely to highly fractured, weakly foliated :, Fo, T, H+No, No, Pl (no break) Becomes highly weathered, weak, low hardness, intensely fractured :, Fo, N, Fe, Su, Wa, S No core recovery ft. Set casing to ft after Run. [] 8 [] No core recovery.8-. ft. Figure A-

24 Project : 88. Log of Core Boring CB- Sheet of s M M Becomes dark greenish gray, weak to very weak, sheared, brecciated and rehealed GRANITIC GNEISS, dark greenish gray, fine-grained, highly weathered, very weak to weak, low hardness, foliated, sheared, brecciated and rehealed (continued) :, Fo, T, Fe, Su, Pl, S UCS, psi Drill Time, -hr [Drill Rate, ft/hr] AND OTHER TESTS 9 [] > >,, QUARTZ Becomes moderately weathered, moderately strong, moderately hard, intensely fractured, iron oxide staining on joint surfaces, mafic-rich GRANITE, light gray, medium-grained, slightly weathered, strong, hard, intensely fractured :, J, T, Fe, Su-Sp, Pl, S :, J, N, No, No, Pl, SR :, J, VN, Fe, Su, Pl, S : 8, V, N, Qz, Fi, Wa, SR Becomes completely weathered, extremely weak :, J, VN, Fe+Mn, Su, Pl, SR No core recovery.-8. ft. Set casing to ft after Run. [] Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > > >,, M GRANITIC GNEISS, dark greenish gray, fine-grained, slightly weathered, moderately strong, moderately hard, intensely fractured, weakly foliated, mafic-rich : -, J, VN, Fe+Mn, Su, Pl, S-SR :, J, MW, crushed rock, Fi, Wa, SR :, J, MW, Fe+Sd+crushed rock, Su-Fi, Wa, SR : 8, J, VN, Fe+Mn, Su, Wa, SR Completely weathered, extremely weak, sandy and clayey Becomes strong, hard, iron oxide staining on joint surfaces : -9, J, VN-N, Fe, Su, Wa, SR :, J, VN, Fe+Mn, Su, Pl, S :, J, N, Fe, Su, Wa, S-SR :, Fo, VN, Si, Fi, Wa, S :, J, VN, Fe, Su, Wa, S No core recovery.-. ft. [8] [] Figure A-

25 Project : 88. Log of Core Boring CB- Sheet of Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB s > > > M M,, 8, GRANITIC GNEISS, dark greenish gray, fine-grained, slightly weathered, strong, hard, intensely fractured, weakly foliated, mafic-rich (continued) : 8, J, N, Fe, Su, Wa, SR :, J, MW, Fe+crushed rock, Su-Pa, Wa, VR GRANITE, light gray, fine-grained, highly altered, weak, brecciated, felsic-rich DIORITIC GNEISS, medium to dark gray, fine- to medium-grained, salt and pepper texture, slightly weathered, strong, hard, foliation dips to :, J, VN, Fe, Su, Wa, VR :, Fo, VN, Fe, Su, Wa, R :, J, T-VN, Fe, Su, Pl, SR :, J, T-VN, Fe, Su, Wa, S-R Becomes dark gray, highly to moderately fractured, biotite-rich :, J, W, Cl+crushed rock, Fi, Pl, SR :, J, VN, No, No, St, VR GRANITE, light gray, medium-grained, fresh, strong, hard, highly fractured, felsic-rich :, J,?, No, No, Wa, SR 8:, J,?, No, No, Pl, SR : -, J, N, No-Fe, No-Su, Pl, R Becomes slightly weathered, intensely fractured, quartz-rich :, J, N, Fe, Sp, Pl, R DIORITIC GNEISS, dark gray, fine-grained, slightly weathered, strong, hard, highly fractured; upper contact at :, J/B, T-VN, Fe, Sp, Wa, SR :, J, VN, Fe, Su, Pl-Wa, SR :, J/B, VN, Fe, Su, Pl, SR GRANITE, light gray, medium-grained, salt and pepper texture, slightly weathered, strong, hard, highly fractured; upper contact at :, J, VN, Fe, Su, Pl, SR :, J, MW, Fe, Sp, St, VR QUARTZ dike :, J, VN, Fe, Su, Wa, R :, J, N, Fe+Mn, Su, Wa, R UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [] 8 [] [] 9 [] [] No core recovery.-. ft. WC=.% DUW=8. pcf No core recovery.-.8 ft WC=.% DUW=. pcf [] AND OTHER TESTS Figure A-

26 Project : 88. Log of Core Boring CB- Sheet of 8 s, 8 M GRANITE, light gray, medium-grained, salt and pepper texture, slightly weathered, strong, hard, highly fractured (continued) : -, J, VN-MW, Fe+Mn, Sp, Pl-Wa, SR-R :, J, T, Fe+Mn, Sp, Wa, SR :, J, T, H+No, No, Wa 8:, J, T, No, No, Wa, R :, J, N, No-Fe+Mn, No-Su, Wa, SR UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [] AND OTHER TESTS 9 WC=.% DUW=. pcf 9 Becomes moderately weathered : -, J, N, Fe+Mn+Si, Su-Sp, Wa, S :, J, W, No, No, St, VR Becomes moderately strong, moderately hard 8 * M M Weak :, J, MW, Fe+Si+crushed rock, Su-Fi, Pl, Slk :, J, N, No, No, Wa, R :, B, T, Fe, Su, Pl, SR :, J, VN, Mn, Su, St, VR Fine-grained SHEAR ZONE: GRANITE, dark yellowish brown, fine-grained, highly altered, very weak, friable, sheared, brecciated [] Asterisk indicates rock does not meet RQD soundness criteria. 8 8:, J, N, Fe+Mn, Su, St, VR 8 :, J, VN, Mn, Su, Pl, SR Moderately weathered, moderately strong, low hardness Becomes completely altered, extremely weak, soft (sand) Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB- 8 9 * One clast recovered; sand washed out of remainder of run [] [] No core recovery.-. ft. No core recovery.8-.9 ft. Figure A-

27 Project : 88. Log of Core Boring CB- Sheet of 8 s SHEAR ZONE: GRANITE, dark yellowish brown, fine-grained, completely altered, extremely weak, soft; sand washed out (continued) UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [] AND OTHER TESTS No core recovery.8-.9 ft. No core recovery.-. ft. [] 9 No core recovery.-9. ft. 8 8 [] 9 9 Stop to clean out excessive slough in corehole. No core recovery 9.-. ft. Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB- 8 9 [] 9 No core recovery.-8. ft. [] Figure A-

28 Project : 88. Log of Core Boring CB- Sheet of 8 9 s SHEAR ZONE: GRANITE, dark yellowish brown, fine-grained, completely altered, extremely weak, soft; sand washed out (continued) UCS, psi Drill Time, -hr [Drill Rate, ft/hr] [] AND OTHER TESTS No core recovery.-8. ft. No core recovery ft. 8 [] inch clast of mafic gneiss, dark gray, fine- to medium-grained, slightly weathered to fresh, strong, hard, in silty sand matrix (possible slough) End for 9//8. 9 Resume coring on 9/9/8. Water level at. ft. No core recovery ft. 8 [] 8 Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB Granitic gneiss clast, weakly foliated, no matrix No core recovery ft. [] 9 No core recovery ft. [] Figure A-

29 Project : 88. Log of Core Boring CB- Sheet of s SHEAR ZONE: GRANITE, dark yellowish brown, fine-grained, completely altered, extremely weak, soft; sand washed out, recovered clasts are granitic gneiss, medium light gray with mafic specks and grayish green chlorite or epidote staining, moderately to slightly weathered, strong, hard, subangular to inches (continued) UCS, psi Drill Time, -hr [Drill Rate, ft/hr] 9 AND OTHER TESTS No core recovery ft. 9 [] > M M,,,, GRANITIC GNEISS, medium light gray with black mafic specks, medium-grained, slightly weathered, strong, hard, intensely fractured, very weakly foliated :, J, T, Fe, Su, Pl, SR :, J, VN, Fe+Ep, Su, Pl, SR :, J, VN, Fe+Mn, Su-Sp, Wa, SR :, J, VN, Fe, Su, Wa, SR :, J, VN-N, Fe+Mn+Ep, Su, Wa, SR-R :, J, N, Fe+Mn, Su, Pl, Slk [] Trip out rods due to mislatch. 99 :, J, VN, Fe, Su, Pl-Wa, SR 9 > 8,8 8: 9, J, T-N, Fe+Mn, Su, Wa-St, SR-VR Report: GEO_CORE_OAK_D; File: OAK_SCLEMDAM.GPJ; //8 CB > >, :, J,?, Fe, Su, Pl, SR :, J, VN, No, No, Wa, SR Crushed :, J, N, Fe, Su, Pl, SR Becomes fresh Crushed : 8, J, VN, No, No, Pl, SR TOTAL DEPTH =.9 FEET At completion of drilling on 9/9/8, caliper and televiewer logging were performed. Oyo downhole testing was completed on 9//8. Vibrating wire piezometer was then installed with tip at bgs; neat cement grout was placed to ground surface. Water level in test of VWP was measured at bgs. [] End coring on 9/9/8. Figure A-

30 Depth. to 8. Depth 8. to. Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS CB- - Box & Figure CB-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

31 Depth. to. Depth. to 9.9 Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS CB- - Box & Figure CB-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

32 Depth 9.9 to.9 Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS CB- - Box Figure CB-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

33 Project : 88. Log of Soil / Core Boring RW- Sheet of Date(s) Drilled Drilling Method Drill Rig Groundwater Level Borehole Completion //8 - //8 Rotary Wash to ft; HQ- Wireline Core -. ft Logged By Drill Bit Size/ Drilling Contractor S. Janowski -in. casing advancer, -in. tricone; HQ- diamond-impregnated Series 8 bit Checked By Total Depth of Borehole M. Schmoll. Approx. Ground Fraste Multidrill-XL (track rig) Pitcher Drilling Company Surface Elevation Not encountered before mud Location GPS rotary;.8 bgs on //8 PR cutoff wall Location N. W. Backfilled with neat cement grout to ground surface Sampler SPT SOIL SAMPLES s POORLY GRADED GRAVEL WITH SAND AND COBBLES (GP), very loose to loose, dry, subrounded granitic gravel and cobbles, coarse-grained quartz sand [Recent Alluvium] Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS Begin rotary wash drilling at 8 on //8. 8 Only granite chips recovered Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW POORLY GRADED SAND (SP), very loose, wet, dark gray, fine- to medium-grained quartz sand with mica flecks and mafics (derived from granite), subrounded grains [Recent Alluvium] 89 End for //8 at 9. Resume on //8; water level at.8 ft at start of drilling. SA: %<# Figure A-

34 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES s SILTY SAND (SM), loose, wet, very dark gray, fine-grained sand, micaceous, wood and root fragments, organic odor [Recent Alluvium] Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS SA: %<# Set casing to ft. 8 9 Lens of medium-grained quartz sand inch thick 8 Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW- 8 9 Becomes less silty, more quartz sand grains, very micaceous, less organic material and odor 89 Figure A-

35 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES 9 s SILTY SAND (SM), loose, wet, very dark gray, fine-grained sand, very micaceous [Recent Alluvium] (continued) POORLY GRADED SAND (SP), loose, wet, medium gray, medium-grained sand, micaceous [Recent Alluvium] Blows / foot Recovery, % 8 Drill Time [Rate, ft/hr] AND TEST RESULTS 98 ORGANIC SILT WITH SAND (OL), loose, moist, very dark gray, fine-grained sand, mica flecks, wood and root fragments, organic odor, low specific gravity [Recent Alluvium] 9 SA: %<# HD: %<µ 9 Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW POORLY GRADED SAND WITH SILT, GRAVEL, AND COBBLES (SP-SM), medium dense, wet, light gray, fineto coarse-grained quartz sand, subrounded to rounded granitic gravel and cobbles [Old Alluvium] Boulder Becomes very dense 8 9 Rough drilling; approx. 9% circulation. Rough drilling.- ft. Figure A-

36 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES 8 s POORLY GRADED SAND WITH SILT, GRAVEL, AND COBBLES (SP-SM), very dense, wet, light gray, fine- to coarse-grained quartz sand, subrounded to rounded granitic gravel and cobbles [Old Alluvium] (continued) 9 Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS Rough drilling Perform constant head permeability test -9 ft. Casing extended to ft due to caving. 8 8/9" SA: %<# DIORITE, grayish black, fresh strong, hard, intensely to highly fractured /" Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW- 8 9 > 9,,, M M : -, J/V?, N, No, No, Pl, Slk : -, J, N, No, No, Pl, R :, J, VN, No, No, Pl, Slk White and black, phaneritic; intensely fractured -. ft : -, J, VN-N, No, No, Pl, R : -, J, N, No, No, St, R :, B, N, No, No, Pl, R GRANITE, pinkish gray to very light gray, porphyritic, fresh, very strong, hard TOTAL DEPTH =. FEET [9] Set casing to ft. Refusal at ft. Begin HQ coring. End coring on //8. Figure A-

37 Depth. to. Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS RW- - Box Figure RW-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

38 Project : 88. Log of Soil Boring RW- Sheet of Date(s) Drilled Drilling Method Drill Rig Groundwater Level(s) Borehole Backfill //8 - //8 Rotary Wash Fraste Multidrill-XL (track rig) Not encountered before mud rotary;. bgs on //8 Backfilled with neat cement grout Logged By Drill Bit Size/ Drilling Contractor Sampling Method(s) Location S. Janowski -in. casing advancer, -in. tricone Pitcher Drilling Company SPT PR cutoff wall Checked By Total Depth of Borehole Approx. Ground Surface Elevation Hammer Data GPS Location M. Schmoll. Automatic trip-drop, lbs with -in. drop N. W. SAMPLES Sampling Resistance, blows / foot Recovery, % Graphic Log WELL-GRADED GRAVEL WITH SAND AND COBBLES (GW), granitic gravel and cobbles, coarse-grained quartz sand [Recent Alluvium] Water Content, % Dry Unit Weight, pcf REMARKS AND OTHER TESTS Begin drilling at on //8 using rotary wash with casing advancer. WELL-GRADED SAND WITH GRAVEL (SW), very loose, wet, medium gray, fine- to coarse-grained sand, subrounded grains, fine to coarse gravel to inch [Recent Alluvium] SA: %<# POORLY GRADED SAND (SP), very loose, wet, dark gray, fine-grained sand, micaceous [Recent Alluvium] SA: %<# Report: GEO_B_OAK_NOUC; File: OAK_SCLEMDAM.GPJ; //8 RW- 8 Organic material in sampler shoe Becomes loose, medium gray, fine- to medium-grained quartz and mafic sand, trace gravel to inch Becomes medium-grained SA: %<# Figure A-

39 Project : 88. Log of Soil Boring RW- Sheet of SAMPLES Sampling Resistance, blows / foot Recovery, % Graphic Log POORLY GRADED SAND (SP), loose, wet, medium gray, medium-grained quartz and mafic sand, micaceous, trace gravel to inch [Recent Alluvium] (continued) Water Content, % Dry Unit Weight, pcf REMARKS AND OTHER TESTS SANDY ORGANIC SILT (OL), loose, moist, dark gray, fine-grained sand, micaceous, wood fragments and roots, organic odor, low specific gravity [Recent Alluvium] 9 SA: %<# HD: %<µ Increase in fine-grained sand and organic material POORLY GRADED SAND (SP), loose, wet, medium gray, medium-grained sand, subrounded grains [Recent Alluvium] 8 9A 9B 9C ORGANIC SILT WITH SAND (OL), as above POORLY GRADED GRAVEL WITH SILT, SAND, AND COBBLES (GP-GM), dense, wet, medium gray, subangular to subrounded granitic gravel and cobbles, fine- to coarse-grained sand [Old Alluvium] Rough drilling. 8 /" Report: GEO_B_OAK_NOUC; File: OAK_SCLEMDAM.GPJ; //8 RW- /" Some rounded grains; possibly decomposed granite in tip of sampler shoe GRANITIC BEDROCK TOTAL DEPTH =. FEET SA: %<# End for //8 at. Resume on //8. Water level at. ft at start of drilling. End drilling at 8 on //8; refusal. Figure A-

40 Project : 88. Log of Soil / Core Boring RW- Sheet of Date(s) Drilled Drilling Method Drill Rig Groundwater Level Borehole Completion //8 - //8 Rotary Wash to. ft; HQ- Wireline Core.- ft Logged By Drill Bit Size/ Drilling Contractor S. Janowski -in. casing advancer, -in. tricone; HQ- diamond-impregnated Series 8 bit Checked By Total Depth of Borehole M. Schmoll. Approx. Ground Fraste Multidrill-XL (track rig) Pitcher Drilling Company Surface Elevation Not encountered before mud Location GPS rotary;.8 bgs on //8 PR cutoff wall Location N. W.8 Backfilled with neat cement grout to ground surface Sampler SPT, Modified California SOIL SAMPLES s WELL-GRADED GRAVEL WITH SAND AND COBBLES (GW), granitic gravel and cobbles, coarse-grained quartz sand [Recent Alluvium] Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS Begin rotary wash drilling at on //8. 8 POORLY GRADED SAND (SP), very loose, wet, light gray, medium- to coarse-grained sand, few fine gravel to / inch [Recent Alluvium] SA: %<# Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW SILTY SAND (SM), very loose, wet, dark gray, fine-grained sand, micaceous, organic odor [Recent Alluvium] 9 Figure A-

41 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES s POORLY GRADED SAND (SP), very loose, wet, dark gray, fine- to medium-grained sand, micaceous, trace decomposed organic material [Recent Alluvium] Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS SA: %<# Set casing to ft. 8 9 Becomes loose, medium gray, trace coarse-grained sand and fine gravel, no organic material SA: %<# 8 Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW- 8 9 SANDY PEAT (PT), loose, moist, dark gray, fibrous decomposing plant material [Recent Alluvium] POORLY GRADED SAND (SP), loose, wet, medium gray, fine- to medium-grained sand, trace coarse-grained sand and fine gravel, micaceous [Recent Alluvium] A B 8 Figure A-

42 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES 9 s POORLY GRADED SAND (SP), loose, wet, medium gray, fine- to medium-grained sand, trace coarse-grained sand and fine gravel, micaceous [Recent Alluvium] (continued) Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS SA: %<# 98 ORGANIC SILT WITH SAND (OL), very loose, moist, dark gray, micaceous, organic odor, low specific gravity [Recent Alluvium] 9 9 PEAT (PT), loose, moist, dark gray, mostly decomposing plant material, layers and lenses of silty fine-grained sand, very low specific gravity [Recent Alluvium] WC=9.8% DUW=. pcf 9 8 Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW Increasing sand, mica flecks Decreasing sand, increasing silt 9 8 SA: %<# HD: %<µ WC=9.% DUW=. pcf Perform constant head permeability test -. ft. Casing extended to ft. Figure A-

43 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES s PEAT (PT), loose, moist, dark gray, mostly decomposing plant material, silty [Recent Alluvium] (continued) Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS POORLY GRADED SAND WITH GRAVEL AND COBBLES (SP), very dense, wet, dark gray, fine- to coarse-grained sand, angular granitic gravel and cobbles [Old Alluvium] Driller reports change at ft. 9 Set casing to 9 ft. 8 SA: %<# 8 POORLY GRADED GRAVEL WITH SAND AND COBBLES (GP), very dense, wet, dark gray, angular to subangular granitic and dioritic gravel and cobbles, medium-grained sand [Old Alluvium] Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW GRANODIORITE, light gray and grayish black, salt and pepper texture, slightly weathered, strong, highly fractured :, J, VN, Ep, Su, Pl, R :, J, VN, Ep+Sd, Su-Sp, Pl, R :, J, VN, Ep, Su, Wa, VR TOTAL DEPTH =. FEET 8/9" 8 Begin HQ coring. [] End for //8. 9 Resume coring on //8; water level at.8 ft. [] No core recovery ft. End coring on 9 //8. Figure A-

44 Depth. to. Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS RW- - Box Figure RW-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

45 Project : 88. Log of Soil / Core Boring RW- Sheet of Date(s) Drilled Drilling Method Drill Rig Groundwater Level Borehole Completion //8 - //8 Rotary Wash to. ft; HQ- Wireline Core.-8. ft Logged By Drill Bit Size/ Drilling Contractor S. Janowski -in. casing advancer, -in. tricone; HQ- diamond-impregnated Series 8 bit Checked By Total Depth of Borehole M. Schmoll 8. Approx. Ground Fraste Multidrill-XL (track rig) Pitcher Drilling Company Surface Elevation Not encountered before mud Location GPS rotary;.8 bgs on //8 PR stabilized slope Location N. W. Backfilled with neat cement grout to ground surface Sampler SPT, Modified California SOIL SAMPLES s POORLY GRADED SAND (SP), loose, dry, light gray, medium- to coarse-grained sand [Recent Alluvium] Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS Begin rotary wash drilling at on //8. 8 Becomes very loose, wet, trace fine gravel SA: %<# Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW Becomes medium gray, fine-grained, micaceous SPT advances with weight of hammer. Figure A-

46 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES s SILTY SAND (SM), very loose, wet, dark gray, fine-grained sand, micaceous, with decomposed fibrous plant material, organic odor [Recent Alluvium] Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS SA: %<# HD: %<µ 8 POORLY GRADED SAND (SP), very loose, wet, medium gray, fine- to medium-grained sand, trace fine gravel, micaceous [Recent Alluvium] 9 SA: %<# 8 Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW- 8 9 POORLY GRADED SAND WITH SILT (SP-SM), very loose, wet, medium gray, fine- to medium-grained sand, trace fine gravel, micaceous [Recent Alluvium] 9 Figure A-

47 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES 9 s POORLY GRADED SAND WITH SILT (SP-SM), very loose, wet, medium gray, fine- to medium-grained sand, trace fine gravel, micaceous [Recent Alluvium] (continued) Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS SA: %<# 98 9 Becomes loose PEAT (PT), loose, moist, dark gray, mostly decomposing plant material, very low specific gravity [Recent Alluvium] Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW POORLY GRADED SAND (SP), loose, wet, dark gray, fine-grained sand, organic odor [Recent Alluvium] ORGANIC SILT WITH SAND (OL), very loose, moist, very dark gray, fine-grained sand, mica flecks, zones of decomposed organic material, organic odor [Recent Alluvium] 8A 8B 9 8 Rods hesitate then drop to times from - ft; probably indicative of organics. Set casing to. ft. Figure A-

48 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES 8 s ORGANIC SILT WITH SAND (OL), very loose, moist, very dark gray, fine-grained sand, mica flecks, zones of decomposed organic material, organic odor [Recent Alluvium] (continued) 9 Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS PI=NP SA: %<# HD: %<µ WC=.% DUW=. pcf Becomes loose 8 8 Becomes dark brownish gray Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW- 8 9 POORLY GRADED SAND WITH GRAVEL (SP), medium dense, wet, light gray, coarse-grained sand, subrounded grains derived from granite [Recent Alluvium?] 89 Set casing to 9 ft. Figure A-

49 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES 8 s POORLY GRADED SAND WITH GRAVEL (SP), medium dense, wet, light gray, coarse-grained sand, subrounded grains derived from granite [Recent Alluvium?] (continued) Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS End for //8. Resume on //8; water level at.8 ft at start of drilling. Sand grades medium- to coarse-grained Hard driling at ft Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW- 8 8 GRANITE, grayish orange pink and dark greenish gray, phaneritic, fresh, strong, moderately hard, highly fractured :, J, T, No, No, Wa, SR :, J, VN-N, No, No, Pl, SR /" Refusal at. ft. Begin HQ coring. Figure A-

50 Project : 88. Log of Soil / Core Boring RW- Sheet of SOIL SAMPLES s GRANITE, grayish orange pink and dark greenish gray, phaneritic, fresh, strong, moderately hard, highly fractured (continued) Blows / foot Recovery, % Drill Time [Rate, ft/hr] AND TEST RESULTS [] :, J, N, No, No, Wa, VR TOTAL DEPTH = 8. FEET 8 No core recovery ft. End coring on // Report: GEO_CORE+SOIL_NIT_NW; File: OAK_SCLEMDAM.GPJ; //8 RW Figure A-

51 Depth. to 8. Project No.88 SAN CLEMENTE DAM REMOVAL CORE PHOTOGRAPHS RW- - Box Figure RW-- P:\Task -- Geotech Investigations & Site Characterization\Task. Subsurface Investigations\Boring Logs and Core Photos\Drilling and Core Photos\Figure A-

52 Project : 88. Log of Soil Boring RW- Sheet of Date(s) Drilled /8/8 Logged By S. Janowski Drilling Method Rotary Wash Drill Rig Fraste Multidrill-XL (track rig) Groundwater Level(s) Not encountered before mud rotary Borehole Backfill Backfilled with neat cement grout Drill Bit Size/ Drilling Contractor Sampling Method(s) Location -in. casing advancer, -in. tricone Pitcher Drilling Company SPT PR stabilized slope Checked By Total Depth of Borehole Approx. Ground Surface Elevation Hammer Data GPS Location M. Schmoll 9. Automatic trip-drop, lbs with -in. drop N. W.9 SAMPLES Sampling Resistance, blows / foot Recovery, % Graphic Log POORLY GRADED SAND (SP), very loose, wet, light gray, fine- to coarse-grained sand, mostly subrounded quartz grains, few fine gravel [Recent Alluvium] Water Content, % Dry Unit Weight, pcf REMARKS AND OTHER TESTS Begin drilling at 8 on /8/8 using rotary wash with casing advancer. SA: %<# Becomes medium gray, fine- to medium-grained sand, trace to no gravel SA: %<# Report: GEO_B_OAK_NOUC; File: OAK_SCLEMDAM.GPJ; //8 RW- POORLY GRADED SAND WITH SILT (SP-SM), loose, wet, light gray, medium-grained quartz sand, micaceous, organic odor [Recent Alluvium] SA: %<# Figure A-8