APPENDIX C HYDROGEOLOGIC INVESTIGATION

Figure B-5.7

Figure B-5.8

Preliminary Geotechnical and Environmental Report Appendix C Hydrogeologic Investigation APPENDIX C HYDROGEOLOGIC INVESTIGATION December 21, 2011 WESTSIDE SUBWAY EXTENSION PROJECT

Preliminary Geotechnical and Environmental Report Appendix C Hydrogeologic Investigation FIGURES C-1.1A THROUGH C-1.3D LOGS OF BORINGS (PE PHASE) December 21, 2011 WESTSIDE SUBWAY EXTENSION PROJECT

LA METRO PB-TUNNEL ZONE S:\70131 GEOTECH\GINTW\LIBRARY MACTEC JUNE2011.GLB C:\DOCUMENTS AND SETTINGS\HPPONNABOYINA\DESKTOP\G1.GPJ 10/3/11 THIS RECORD IS AN INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. LATITUDE AND LONGITUDE OF BORING LOCATION SHOWN ON LOGS ARE APPROXIMATE. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) 305 300 295 Westwood/ UCLA Station 290 285 280 275 270 DEPTH (ft) 5 10 15 20 25 30 35 40 "N" VALUE STD.PEN.TEST 19 8 8 OVA (ppm)** MOISTURE CONTENT (% of dry wt.) 15.3 11.0 12.4 20.5 25.3 16.9 DRY DENSITY (pcf) 109-119 - 98 102 MTA Westside Subway Extension Los Angeles, California BLOW COUNT* (blows/ft) push 8 3 6 PERCENT PASSING No. 200 SIEVE 40 17 48 70 SAMPLE LOC. DOWNHOLE TESTS PMT DRILLING COMPANY/DRILLING EQUIPMENT C & L Drilling / Mayhew 1000 DRILLING METHOD Rotary Wash DATES DRILLED 5/27/2011 and 5/28/2011 CL SC SM SM CL CL SM SC 3½-inch thick Asphaltic Concrete over 2-inch thick Base Course QUATERNARY YOUNGER ALLUVIUM [Qal] GRAVELLY LEAN CLAY - moist, brown, trace roots CLAYEY SAND with GRAVEL - very loose, moist, brown, fine-grained, trace fine to coarse gravel SILTY SAND with GRAVEL - medium dense, moist, brown, fine to coarse-grained, gravel (up to ½ inch in size) SILTY SAND - loose, moist, brown, fine-grained, trace coarse gravel LEAN CLAY with GRAVEL - medium stiff, moist, brown, trace fine sand, coarse gravel LEAN CLAY with SAND - soft, moist, brown, fine sand, trace coarse gravel Becomes medium stiff BOREHOLE LOCATION Sta 811+70, Rt 25 feet HOLE DIAMETER 4-7/8 inches BORING NO. OB-105 GROUND EL. 308 feet GROUND-WATER READINGS Two monitoring wells installed on 5/28/2011; ground-water level measured at a depth of 47 feet on 7/1/2011. See last page of this boring for details. (CONTINUED ON FOLLOWING FIGURE) QUATERNARY OLDER ALLUVIUM [Qalo] SILTY SAND - loose, moist, brown, fine sand, trace coarse gravel CLAYEY SAND - medium dense, moist, brown, fine to coarse-grained, trace fine to coarse gravel Field Tech: MH Prepared/Date: YN 8/22/2011 Checked/Date: LT/HP/PE 9/13/11 LOG OF BORING Project No.: 4953-10-1561 Figure: C-1.1a

LA METRO PB-TUNNEL ZONE S:\70131 GEOTECH\GINTW\LIBRARY MACTEC JUNE2011.GLB C:\DOCUMENTS AND SETTINGS\HPPONNABOYINA\DESKTOP\G1.GPJ 10/3/11 THIS RECORD IS AN INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. LATITUDE AND LONGITUDE OF BORING LOCATION SHOWN ON LOGS ARE APPROXIMATE. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) 265 260 255 Westwood/ UCLA Station 250 245 240 235 230 DEPTH (ft) 45 50 55 60 65 70 75 80 "N" VALUE STD.PEN.TEST 23 27 40 54 OVA (ppm)** MOISTURE CONTENT (% of dry wt.) 19.4 17.1 11.4 10.3 23.2 15.1 26.4 19.1 DRY DENSITY (pcf) - 98-118 - 117-108 MTA Westside Subway Extension Los Angeles, California BLOW COUNT* (blows/ft) 9 20 21 30 PERCENT PASSING No. 200 SIEVE 13 84 SAMPLE LOC. DOWNHOLE TESTS PMT DRILLING COMPANY/DRILLING EQUIPMENT C & L Drilling / Mayhew 1000 DRILLING METHOD Rotary Wash DATES DRILLED 5/27/2011 and 5/28/2011 SM SW- SM SM CL CL CL CL BOREHOLE LOCATION Sta 811+70, Rt 25 feet HOLE DIAMETER 4-7/8 inches SILTY SAND - loose, moist, brown, fine to medium-grained WELL GRADED SAND with SILT - medium dense, moist, brown, fine to medium-grained, trace fine to coarse gravel SILTY SAND with GRAVEL - medium dense, moist, brown, fine-grained LEAN CLAY - hard, moist, brown SANDY LEAN CLAY - very stiff, moist, brown, fine sand LEAN CLAY with SAND - hard, moist, brown SAN PEDRO FORMATION [Qsp] LEAN CLAY with SAND - hard, moist, brown BORING NO. OB-105 (Continued) GROUND EL. 308 feet GROUND-WATER READINGS Two monitoring wells installed on 5/28/2011; ground-water level measured at a depth of 47 feet on 7/1/2011. See last page of this boring for details. (CONTINUED ON FOLLOWING FIGURE) Field Tech: MH Prepared/Date: YN 8/22/2011 Checked/Date: LT/HP/PE 9/13/11 LOG OF BORING Project No.: 4953-10-1561 Figure: C-1.1b

LA METRO PB-TUNNEL ZONE S:\70131 GEOTECH\GINTW\LIBRARY MACTEC JUNE2011.GLB C:\DOCUMENTS AND SETTINGS\HPPONNABOYINA\DESKTOP\G1.GPJ 10/3/11 THIS RECORD IS AN INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. LATITUDE AND LONGITUDE OF BORING LOCATION SHOWN ON LOGS ARE APPROXIMATE. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) 225 220 215 210 205 200 195 190 DEPTH (ft) 85 90 95 100 105 110 115 120 "N" VALUE STD.PEN.TEST 45 60 32 94 OVA (ppm)** MOISTURE CONTENT (% of dry wt.) 25.8 27.5 17.8 23.4 34.4 21.3 19.8 18.5 DRY DENSITY (pcf) - 92-99 - - - 113 MTA Westside Subway Extension Los Angeles, California BLOW COUNT* (blows/ft) 20 18 24 32 PERCENT PASSING No. 200 SIEVE 73 37 14 SAMPLE LOC. DOWNHOLE TESTS DRILLING COMPANY/DRILLING EQUIPMENT C & L Drilling / Mayhew 1000 DRILLING METHOD Rotary Wash DATES DRILLED 5/27/2011 and 5/28/2011 SC CL SM SW Becomes stiff CLAYEY SAND - very dense, moist, brown, fine to medium-grained SANDY CLAY - very stiff, moist, brown, fine sand Becomes hard BOREHOLE LOCATION Sta 811+70, Rt 25 feet HOLE DIAMETER 4-7/8 inches SILTY SAND - medium dense, wet, greenish-gray, fine-grained (Disturbed sample recovered) Becomes very dense, yellowish brown Becomes dense, reddish brown BORING NO. OB-105 (Continued) GROUND EL. 308 feet GROUND-WATER READINGS Two monitoring wells installed on 5/28/2011; ground-water level measured at a depth of 47 feet on 7/1/2011. See last page of this boring for details. (CONTINUED ON FOLLOWING FIGURE) Field Tech: MH Prepared/Date: YN 8/22/2011 Checked/Date: LT/HP/PE 9/13/11 LOG OF BORING Project No.: 4953-10-1561 Figure: C-1.1c

LA METRO PB-TUNNEL ZONE S:\70131 GEOTECH\GINTW\LIBRARY MACTEC JUNE2011.GLB C:\DOCUMENTS AND SETTINGS\HPPONNABOYINA\DESKTOP\G1.GPJ 10/3/11 THIS RECORD IS AN INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. LATITUDE AND LONGITUDE OF BORING LOCATION SHOWN ON LOGS ARE APPROXIMATE. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) 185 180 175 170 165 160 155 150 DEPTH (ft) 125 130 135 140 145 150 155 160 "N" VALUE STD.PEN.TEST 50/5" OVA (ppm)** MOISTURE CONTENT (% of dry wt.) DRY DENSITY (pcf) 12.2 - MTA Westside Subway Extension Los Angeles, California BLOW COUNT* (blows/ft) PERCENT PASSING No. 200 SIEVE SAMPLE LOC. DOWNHOLE TESTS DRILLING COMPANY/DRILLING EQUIPMENT C & L Drilling / Mayhew 1000 DRILLING METHOD BOREHOLE LOCATION Rotary Wash Sta 811+70, Rt 25 feet DATES DRILLED HOLE DIAMETER 5/27/2011 and 5/28/2011 4-7/8 inches WELL GRADED SAND with GRAVEL - very dense, wet, yellow brown END OF BORING AT 121 FEET NOTES: Hand augered upper 5 feet to avoid damage to utilities. Two monitoring wells installed in the borehole on 5/28/2011; Groundwater level measured in the deeper well at a depth of 47 feet below the ground surface on 7/1/2011. Shallower well was dry. Borehole grouted with cement bentonite slurry and patched with asphalt concrete. "N" Value Standard Penetration Test: Number of blows required to drive the SPT sampler 18 inches using a 140 pound automatic hammer falling 30 inches. *Number of blows required to drive the Crandall Sampler 12 inches using a 380 pound hammer falling 18 inches. **Photo Ionization Detector used for OVA readings. PMT - Pressuremeter test BORING NO. OB-105 (Continued) GROUND EL. 308 feet GROUND-WATER READINGS Two monitoring wells installed on 5/28/2011; ground-water level measured at a depth of 47 feet on 7/1/2011. See last page of this boring for details. Field Tech: MH Prepared/Date: YN 8/22/2011 Checked/Date: LT/HP/PE 9/13/11 LOG OF BORING Project No.: 4953-10-1561 Figure: C-1.1d

B2SOIL_MACTEC_REV1 (ELEVATION) P:\MACTEC\MTA WESTSIDE EXTENSION\BORING LOGS\GINT DB & TEMPLATE\LIBRARY MACTEC FEB11.GLB C:\DOCUMENTS AND SETTINGS\KPARKER\DESKTOP\MTA WESTSIDE-MORENO.GPJ 6/29/11 THIS RECORD IS A REASONABLE INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) DEPTH (ft) 5 10 15 20 25 30 35 40 45 "N" VALUE STD.PEN.TEST MOISTURE (% of dry wt.) MTA Westside Extension Los Angeles, California DRY DENSITY (pcf) BLOW COUNT* (blows/ft) 12 16 SAMPLE LOC. DATE DRILLED: EQUIPMENT USED: HOLE DIAMETER (in.): ELEVATION: ** ML SP ML- CL SP ML- CL ML (CONTINUED ON FOLLOWING FIGURE) BORING OB-106 June 3, 2011 CME-75 - Hollow Stem Auger 8-in 0.3 feet of asphalt SILT (ml) - dark brown, moist, some clay, no odor FILL SILTY GRAVELY SAND (sp) - dark brown, moist, gravel up to 2-inches in diameter Refusal at 6 feet, moved boring 4 feet to the southwest NATIVE CLAYEY SILT (ml-cl) - dark brown, moist SILT (ml) - dark olive brown, moist, trace of clay GRAVELY SAND (sp) - brown, shale fragments up to 1-inch in diameter CLAYEY SILT (ml-cl) - dark olive brown, medium stiff, very moist See S-114 for complete lithology from 21 to 40 feet SANDY SILT (ml) - dark brown, very stiff, slightly moist, fine sand LOG OF BORING Project: 4953-10-1561 Field Tech: PK Prepared By: KP Checked By: Figure C-1.2a

B2SOIL_MACTEC_REV1 (ELEVATION) P:\MACTEC\MTA WESTSIDE EXTENSION\BORING LOGS\GINT DB & TEMPLATE\LIBRARY MACTEC FEB11.GLB C:\DOCUMENTS AND SETTINGS\KPARKER\DESKTOP\MTA WESTSIDE-MORENO.GPJ 6/29/11 THIS RECORD IS A REASONABLE INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) DEPTH (ft) 50 55 60 65 70 75 80 85 90 "N" VALUE STD.PEN.TEST MOISTURE (% of dry wt.) MTA Westside Extension Los Angeles, California DRY DENSITY (pcf) BLOW COUNT* (blows/ft) SAMPLE LOC. DATE DRILLED: EQUIPMENT USED: HOLE DIAMETER (in.): ELEVATION: ** BORING OB-106 (Continued) 26 ML SILT (ml) - (10YR, 4/3) brown, very stiff, moist, some clay, trace of fine sand, no odor, wet sluff at top of sampler NOTES: June 3, 2011 CME-75 - Hollow Stem Auger 8-in Total Depth = 69 feet bgs Hand augered to 5 feet bgs SPT samples taken at 20, 40, and 60 feet bgs Well Construction Details Bentonite cement grout to approximately 1.5 feet Medium bentonite chips to 41 feet 0.01-inch perforated screen from 48 to 68 feet Monterey #3 sand from 46 to 69 feet LOG OF BORING Project: 4953-10-1561 Field Tech: PK Prepared By: KP Checked By: Figure C-1.2b

METRO SOIL CORE MC 200 TUNNEL ZONE S:\70131 GEOTECH\GINTW\LIBRARY MACTEC JUNE2011.GLB C:\DOCUMENTS AND SETTINGS\HPPONNABOYINA\DESKTOP\G1.GPJ 10/3/11 THIS RECORD IS AN INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. LATITUDE AND LONGITUDE OF BORING LOCATION SHOWN ON LOGS ARE APPROXIMATE. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) 305 300 295 290 285 280 275 270 DEPTH (ft) 5 10 15 20 25 30 35 40 BOX # 1 2 3 RUN # 1, 2 3 4 % RECOVERY 75 100 55 MOISTURE CONTENT (% of dry wt.) PERCENT PASSING No. 200 SIEVE 3.5 5.1 3.3 15.7 4.0 6.1 7 47 25 MTA Westside Subway Extension Los Angeles, California SAMPLE LOC. DRILLING COMPANY/DRILLING EQUIPMENT Boart Longyear / 600T Trusonic drill rig DRILLING METHOD Sonic Coring DATES DRILLED 5/27/11-5/29/11 GROUND-WATER READINGS Ground-water level not measured. ML SM SW- SM SC- SM SC- SM SM SM ML 2½ inch thick Asphalt Concrete QUATERNARY YOUNGER ALLUVIUM [Qal] SILT - moist, brown, trace sand and gravel Some clay 5-inch shale fragment Layer of Sandy Silt with Gravel (up to 2 inches in size) No core recovery from 6 to 9 feet SILTY SAND with GRAVEL - medium dense, dry to slightly moist, dark greenish gray (10Y 4/1), fine to coarse grained, fine to coarse gravel (up to 2 inches in size) Layers of Sandy Silt, moist, very dark grayish brown, fine to coarse sand, some fine to coarse gravel No core recovery from 14 to 15 feet WELL GRADED SAND with SILT and GRAVEL - dry to slightly moist, dark greenish gray (10Y 4/1), fine to coarse grained, fine to coarse gravel (up to 1½ inches in size) SILTY CLAYEY SAND - medium dense, moist, dark grayish brown (2.5Y 3/2), fine grained, some medium to coarse, some fine gravel (up to ¾ inch in size), trace cobble (up to 4 inches in size), alternating layers of Sandy Silt SILTY SAND with GRAVEL - medium dense, moist, dark greenish gray (10Y 3/1), fine to coarse grained, fine to coarse gravel (up to 1½ inches in size) Becomes yellowish-brown BOREHOLE LOCATION 813+20, Rt 25 feet HOLE DIAMETER 6 inches No core recovery from 28 to 31 feet BORING NO. P-103 GROUND EL. 309 feet QUATERNARY OLDER ALLUVIUM [Qalo] SILTY SAND with GRAVEL - medium dense, moist, dark greenish gray (10Y 3/1) Becomes brown (10YR 4/3) SANDY SILT - very stiff to hard, moist, brown, fine sand, some fine gravel (CONTINUED ON FOLLOWING FIGURE) LOG OF BORING Project No.: 4953-10-1561 Field Tech: RS/RH Prepared/Date: YN/WL 9/30/2011 Checked/Date: HP/PE 10/2/2011 Figure: C-1.3a

METRO SOIL CORE MC 200 TUNNEL ZONE S:\70131 GEOTECH\GINTW\LIBRARY MACTEC JUNE2011.GLB C:\DOCUMENTS AND SETTINGS\HPPONNABOYINA\DESKTOP\G1.GPJ 10/3/11 THIS RECORD IS AN INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. LATITUDE AND LONGITUDE OF BORING LOCATION SHOWN ON LOGS ARE APPROXIMATE. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) 265 260 255 Tunnel 250 245 Tunnel 240 235 230 DEPTH (ft) 45 50 55 60 65 70 75 80 BOX # 4 5 6 7 RUN # 5 6 7 8 % RECOVERY 100 100 100 100 MOISTURE CONTENT (% of dry wt.) PERCENT PASSING No. 200 SIEVE 12.9 23.6 25.5 27.2 18.7 21.7 18.8 9.0 18.2 19.6 20.0 23.6 62 63 70 82 MTA Westside Subway Extension Los Angeles, California SAMPLE LOC. DRILLING COMPANY/DRILLING EQUIPMENT Boart Longyear / 600T Trusonic drill rig DRILLING METHOD Sonic Coring DATES DRILLED 5/27/11-5/29/11 GROUND-WATER READINGS Ground-water level not measured. ML CL ML CL CL- ML ML CL CH Alternating layers of Silty Sand, moist, brown, fine to coarse-grained, fine to coarse gravel SANDY LEAN CLAY - moist, brown, fine to medium sand, trace coarse, occasional fine gravel (up to 3/8 inch in size) Alternating Sandy Silt, trace fine to coarse gravel SILT with SAND - moist, brown, fine sand, trace fine gravel Becomes dark greenish gray with brown spots SANDY LEAN CLAY - medium stiff, moist, dark greenish gray, brown and varying colors, fine sand, some medium to coarse, trace fine gravel (up to 3/4 inch in size) SILTY CLAY with SAND - medium stiff, moist, brown and dark greenish gray, fine to coarse sand, trace gravel Fine to coarse gravel BOREHOLE LOCATION 813+20, Rt 25 feet HOLE DIAMETER 6 inches SANDY SILT with GRAVEL - stiff, moist, dark greenish gray, fine to coarse sand, fine to coarse gravel (up to 2 inches in size) LAKEWOOD FORMATION [Qlw] LEAN CLAY with SAND - medium stiff to stiff, moist, brown, fine sand, trace medium and coarse, occasional gravel (up to 3/8 inch in size) Becomes dark brown (10YR 3/3) BORING NO. P-103 (Continued) GROUND EL. 309 feet FAT CLAY - very stiff, moist, dark greenish gray with brown mottling, trace fine and medium sand, trace calcium carbonate nodules (CONTINUED ON FOLLOWING FIGURE) LOG OF BORING Project No.: 4953-10-1561 Field Tech: RS/RH Prepared/Date: YN/WL 9/30/2011 Checked/Date: HP/PE 10/2/2011 Figure: C-1.3b

METRO SOIL CORE MC 200 TUNNEL ZONE S:\70131 GEOTECH\GINTW\LIBRARY MACTEC JUNE2011.GLB C:\DOCUMENTS AND SETTINGS\HPPONNABOYINA\DESKTOP\G1.GPJ 10/3/11 THIS RECORD IS AN INTERPRETATION OF SUBSURFACE CONDITIONS AT THE EXPLORATION LOCATION. LATITUDE AND LONGITUDE OF BORING LOCATION SHOWN ON LOGS ARE APPROXIMATE. SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND AT OTHER TIMES MAY DIFFER. INTERFACES BETWEEN STRATA ARE APPROXIMATE. TRANSITIONS BETWEEN STRATA MAY BE GRADUAL. ELEVATION (ft) 225 220 215 210 205 200 195 190 DEPTH (ft) 85 90 95 100 105 110 115 120 BOX # 8 9 10 11 RUN # 9 10 11 12 % RECOVERY 100 100 100 100 MOISTURE CONTENT (% of dry wt.) PERCENT PASSING No. 200 SIEVE 24.5 28.1 18.1 28.2 24.5 23.2 24.8 22.9 19.5 21.0 20.3 20.5 92 95 92 MTA Westside Subway Extension Los Angeles, California SAMPLE LOC. DRILLING COMPANY/DRILLING EQUIPMENT Boart Longyear / 600T Trusonic drill rig DRILLING METHOD Sonic Coring DATES DRILLED 5/27/11-5/29/11 GROUND-WATER READINGS Ground-water level not measured. CH ML CH ML ML CH CL SP SW Trace fine gravel, abundant shell fragments, trace calcium carbonate nodules Occasional fine to medium gravel Occasional fine gravel HOLE DIAMETER 6 inches Some fine to coarse sand SANDY SILT - hard, moist, olive (5Y 5/4), trace fine gravel Alternating with layers of Silt and Clay, moist, olive gray to dark olive gray with brown mottling, trace fine sand Some shell fragments Some calcium carbonate nodules FAT CLAY - hard, moist, olive gray with some brown mottling, trace fine to coarse sand, occasional fine gravel SILT with SAND - hard, moist, olive gray with black and brown mottling, fine sand Some calcium carbonate nodules BOREHOLE LOCATION 813+20, Rt 25 feet BORING NO. P-103 (Continued) GROUND EL. 309 feet FAT CLAY - hard, moist, brown to grayish green, very few brown mottling, trace fine to coarse sand, trace fine gravel (up to 3/8 inch in size) No brown mottling, few calcium carbonate nodules SANDY LEAN CLAY with GRAVEL - stiff, moist, dark greenish gray, fine to coarse sand, fine to coarse gravel, some calcium carbonate nodules POORLY GRADED SAND - medium dense to dense, moist to wet, yellowish brown (10YR 5/6), trace fine black slate gravel (CONTINUED ON FOLLOWING FIGURE) LOG OF BORING Project No.: 4953-10-1561 Field Tech: RS/RH Prepared/Date: YN/WL 9/30/2011 Checked/Date: HP/PE 10/2/2011 Figure: C-1.3c

Preliminary Geotechnical and Environmental Report Appendix C Hydrogeologic Investigation FIGURES C-2.1 THROUGH C-2.4 GROUNDWATER MONITORING WELL DIAGRAMS December 21, 2011 WESTSIDE SUBWAY EXTENSION PROJECT

Preliminary Geotechnical and Environmental Report Appendix C Hydrogeologic Investigation FIGURES C-3.1 THROUGH C-3.84 NOTICE OF INTENT (NOI) December 21, 2011 WESTSIDE SUBWAY EXTENSION PROJECT

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