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40 Contents 1.
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41 LIST OF FIGURES: Figure 1 – Site Vicinity Figure 2 – Site Layout – Aerial Photo Figure 3 – Geotechnical Instrumentation Sites Figure 4 – CPT Sounding – Data Reduction Figure 5 – Shear Wave Velocity Profiles Figure 6 – Shear Wave Velocity Profiles (Cont.) Figure 7 – SPT Sounding – Data Reduction Figure 8 – Index Property Profiles Figure 9 – Laboratory Test Results Profiles Figure 10 – Sampling Locations and Advanced Testing Overview Figure 11 - "Unit A" (Clay)
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42 1. INTRODUCTION 1.1 General This site exploration report was prepared in accordance with National Academies of Sciences, Engineering, and Medicine (NAS)
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43 sounding and testing. Detailed information about supplemental sounding and testing, synthesis of the 1982 and 2004 data, is provided in Youd et al.
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44 2. GEOLOGY 2.1 Regional Geology The WLA site is within the Salton Trough, which is part of the Colorado Desert geomorphic province (Norris and Webb, 1990)
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45 3. SUMMARY AND INTERPRETATION OF PREVIOUS GEOTECHNICAL STUDIES 3.1 Overview of Previous Site Exploration Program The WLA site was extensively explored and studied in the past.
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46 corresponding soil plasticity and grain size distribution charts are presented in Figures 12 through 15. Additional properties of the soils (Specific Gravity, Gs and organic matter content)
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47 4. CURRENT SUBSURFACE EXPLORATION AND IN-SITU TESTING 4.1 Overview of Current Site Exploration Program Current site exploration program included advancement of five CPT soundings, drilling, logging, sampling, and slug testing.
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48 Behavior Type, SBT; Robertson, 2010) are enclosed in Attachment A
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49 Table 4-3. Summary and Interpretation of SPT Sounding in the "Critical" Layer Sounding Note N (N1)
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50 5. GEOTECHNICAL LABORATORY TESTING 5.1 Overview of Current Geotechnical Laboratory Testing An overview of the current geotechnical laboratory testing program is schematically presented in Figure 10.
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51 Table 5-1 – Summary of Saturated Hydraulic Conductivity Test Results and Estimates Stratum Location and Depth Estimated Hydraulic Conductivity (centimeters per second) "Unit A" B-1 7 to 8-½ feet bgs (2.1 to 2.6 m)
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52 to "Unit C" based upon the results of index testing. • Figure 14 is a summary of relevant index testing for silt ("Units D - G")
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53 6. INTERPRETATION OF GEOLOGY AND SUBSURFACE CONDITIONS 6.1 General Subsurface soil materials encountered in our borings consisted of alluvial soils.
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54 Groundwater was encountered in sonic borings S-1 and S-2 (Attachment B) at depths ranging from approximately 4-½ (1.4 m)
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55 7. CLOSURE This site exploration report was prepared in accordance with National Academies of Sciences, Engineering, and Medicine (NAS)
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56 LIMITATIONS In preparing the findings and professional opinions presented in this report, GLA has endeavored to follow generally accepted principles and practices of the engineering geologic and geotechnical engineering professions in the area and at the time our services were performed. No warranty, express or implied, is provided.
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57 REFERENCES Bennett, M.J., McLaughlin, P.V., Sarmiento, J.S., and Youd, T.L.
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58 Hvorslev, M.J.
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ATTACHMENT A Coordinates of Drilling and CPT Sounding/Locations and Falling Head Test Locations CPT Sounding Logs, CPT-1 to CPT-5
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ATTACHMENT B Field Procedures for Sample Recovery and Collection Boring Logs B-1, B-2, S-1, and S-2
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FIELD PROCEDURE FOR SOIL SAMPLE COLLECTION Bulk Samples: Bulk samples of subsurface earth materials were obtained from the exploratory borings. The samples were bagged and transported to the laboratory for testing.
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NCHRP 12-114 SO18.1228.00 Wildlife Liquefaction Array
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ALLUVIUM Lean CLAY: Brown, moist. Wet, stiff; silty sand in lower 3 inches of sample; black organic inclusions.
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ALLUVIUM Sandy SILT: Light brown, moist; black organic inclusions. Soft, wet; silty sand in sampler shoe.
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ALLUVIUM Lean CLAY: Brown, moist; reddish yellow mottling; black organic inclusions.
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ALLUVIUM Lean CLAY: Brown, dry to moist; decreasing plasticity from approximately 0 to 5 feet bgs. Sandy SILT: Brown to dark brown, wet; increasing plasticity from approximately 5 to 6 feet bgs.
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ATTACHMENT C (Evaluation of SPT Rig Energy Transfer Ratio, ETR)
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ATTACHMENT D (Falling Head Test Logs)
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ATTACHMENT E (Routine Geotechnical Laboratory Test Results)
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ROUTINE GEOTECHNICAL LABORATORY TESTING PROCEDURES AND TEST RESULTS Classification: Soils were classified visually and texturally in accordance with the Unified Soil Classification System (USCS) in general accordance with ASTM D 2488.
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Table 1. Results of routine geotechnical laboratory tests on sample collected from the Wildlife Site Sample Organic Matter (%)
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Borehole B-1 at depth 6.9 to 7.6 m Borehole B-2 at depth 4.9 to 5.6 m
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