APPENDIX B SUBSURFACE EXPLORATIONS
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1 APPENDIX B SUBSURFACE EXPLORATIONS
2 APPENDIX B SUBSURFACE EXPLORATIONS TABLE OF CONTENTS Page B.1. B.2. B.3. B.4. B.5. B.6. B.7. GENERAL...B-1 HEALTH AND SAFETY PLAN...B-1 DRILLING PROCEDURES...B-1 SAMPLING PROCEDURES...B-2 ENVIRONMENTAL FIELD SCREENING FOR VOLITILE ORGANIC COMPOUNDS (VOCS)...B-2 REVIEW AND CLASSIFICATION OF SAMPLES...B-3 B.6.1. Field Observations...B-3 B.6.2. Soil Classification System...B-3 B.6.3. Geologic Units and Descriptions...B-3 B.6.4. Boring Log...B-3 REFFERENCES...B-4 FIGURES B-1 Soil Classification and Log Key (3 sheets) B-2 Log of Boring B-12 (9 sheets) B-3 Core Photographs Boring B-12 (9 sheets) AB/wp/ADY B-i
3 APPENDIX B SUBSURFACE EXPLORATIONS B.1. GENERAL Shannon & Wilson drilled one new boring (B-12) at the intersection of Paseo Del Mar and Weymouth Avenue at the location shown on Plate 1. The boring was drilled to a depth of approximately 131 feet below the existing ground surface. A description of the drilling methods and other field procedures used to perform the subsurface exploration is included in this appendix. The Soil and Rock Classification and Log Key is provided as Figure B-1. The boring log for B-12 is included as Figure B-2. Photographs of the rotary core samples are included as Figure B-3. B.2. HEALTH AND SAFETY PLAN The Health and Safety Plan used as a part of boring B-12 activities was prepared during previous fieldwork at the site, and provided in Appendix B of the Addendum Report (2012b). The plan identified known hazards at the site and possible hazards related to subsurface structures and utilities. The plan was previously submitted to City representatives for their review and approval. The field program for B-12 was completed with no reportable injuries to Shannon & Wilson personnel or subcontractors. B.3. DRILLING PROCEDURES Gregg Drilling & Testing, Inc. (Gregg) of Signal Hill, California provided and operated a trackmounted Fraste MD/XL drill rig to complete boring B-12 between April 11 and April 16, A California Certified Engineering Geologist from Shannon & Wilson supervised the field exploration program, including locating the boring, observing the exploratory drilling, collecting samples, and logging the boring. Our Field Activity Reports during the drilling are included in Appendix A. The triple-tube core barrel used in the rotary core drilling method by Gregg Drilling consists of inner and outer barrels and a split inner core tube. The outer barrel rotates while the inner barrel and the inner split tube remain stationary. This system helps protect the core from the drilling fluid (mixture of soil/rock cuttings and water) and reduces the torsional forces transmitted to the core. In addition, the split inner tube allows for detailed visual analysis of the relatively AB/wp/ADY B-1
4 undisturbed core. The system used by Gregg Drilling for this project was a HQ-3 system, where the core diameter is 2.5 inches and the borehole diameter is 3.75 inches. Following geophysical logging the hole was then reamed to a 6-inch-diameter using a tri-cone bit. During the mud-rotary drilling, bentonite drilling mud was pumped out of a mud tank at the ground surface, down the N-size (2.8-inch OD) drill rods, out through the bit at the bottom of the borehole, up the annulus of the hole between the drill rods and the borehole, and back into the mud tank. The circulating drilling mud removed the cuttings generated by the drilling process from the hole, carrying them to the surface where they were screened and removed from the circulating drilling mud. B.4. SAMPLING PROCEDURES Continuous HQ3 coring was used in boring B-12 to sample and advance through rock. The boring log is provided in this appendix. Core samples were visually described and classified in the field, then boxed for transport to our laboratory and storage facility for further examination. Our field representative observed the coring process, logged the core, and noted the bedding, Designation (RQD), which is defined as the sum of the length of core pieces in a given core run that are greater than 4 inches in length divided by the total core run length. The percent recovery and RQD are represented on the boring logs. The samples obtained from the rotary core method are assumed to be relatively undisturbed. Rock type, relative orientations of any bedding or discontinuities, and any other pertinent features were measured, recorded and noted on the log of each boring. B.5. ENVIRONMENTAL FIELD SCREENING FOR VOLITILE ORGANIC COMPOUNDS (VOCS) Soil samples were field screened by the Shannon & Wilson field representative for contamination in accordance with Guidelines. Fieldscreening methods consist of (a) visual observations, (b) photoionization detector (PID) measurements, (c) and/or olfactory observations. The PID was used to screen for the presence VOCs. Field screening did not indicate potential soil contamination. The intent of PID monitoring is to evaluate the potential presence of contamination of soil and potential exposure to VOC in the breathing zone during drilling operations. Chemical testing on samples of the drill cutting and mud was performed, prior to disposal AB/wp/ADY B-2
5 B.6. REVIEW AND CLASSIFICATION OF SAMPLES B.6.1. Field Observations The boring was observed by a Shannon & Wilson California Certified Engineering Geologist, who collected, classified, stored, and transported soil and rock samples; performed field screening; and prepared a detailed log of the exploration. In addition to examining and collecting soil samples, the field representatives also noted drill action, problems during drilling (e.g., heave, hole collapse, etc.), and other issues. B.6.2. Soil Classification System Soil classification for this project was based on ASTM D 2487, Standard Test Method for Classification of Soil for Engineering Purposes, and ASTM D 2488, Standard Recommended Practice for Description of Soils (Visual-Manual Procedure). The system is called the Unified Soil Classification System (USCS) and is summarized in Figure B-1. Rock classification was done in accordance with International Society of Rock Mechanics (Ulusay et al., 2007) methods. Figure B-1 presents a summary of the ISRM rock classification system. B.6.3. Geologic Units and Descriptions The geologic units as described in the report are used to maintain consistency when defining geology encountered in the borings throughout the project area. These geologic units are interpretive and are based on our review of existing geologic literature for the project area. The geologic unit designations for each soil layer are shown in the descriptions in the boring logs included in this appendix. B.6.4. Boring Log A boring log is a written record of the subsurface conditions encountered in the exploration. It shows the soil or rock layers (bedding) and fractures or discontinuities encountered in the exploration and the rock or USCS symbol of each layer. Other information shown in the boring logs includes groundwater level measurements, horizontal coordinates, surface elevation, and types and depths of sampling. Because a down-hole televiewer was performed, measured bedding and discontinuity attitudes are also shown on the boring log. The review and completion of the final boring logs were performed by following a Quality Assurance/Quality Control (QA/QC) process developed by Shannon & Wilson. This program includes review of the samples by an experienced geologist after initial field observations are made, cross-checks with laboratory test results, and further cross-checks with AB/wp/ADY B-3
6 developed geologic profiles. This detailed procedure is followed to assure consistency of the data presentation and to provide adequate QC for each exploration. B.7. REFERENCES ASTM International (ASTM), 2006, Annual Book of Standards-Construction, v. 4.08, soil and rock, (I): D 420 D 5611: West Conshohocken, Pa Ulusay, Resat and Hudson, J. A., eds., 2007, The complete ISRM suggested methods for rock characterization, testing and monitoring: : Ankara, Commission on Testing Methods, International Society of Rock Mechanics, 628 p. Shannon & Wilson, Inc., 2012b, Final Addendum Geotechnical Report No. 1, White Point Landslide: Report prepared by Shannon & Wilson, Inc., Glendale, Calif., W. O. E , for City of Los Angeles Geotechnical Engineering Group, Los Angeles, Calif., August, 500 p AB/wp/ADY B-4
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