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15 May 2019 <br />AGE Project No. 14-3002 <br />Page 8 of 17 <br />To evaluate and characterize data collected at the subject property, the findings and <br />results were compared to one or more of the following environmental screening levels: 1) <br />the January 2019 California RWQCB Environmental Screening Levels for <br />commercial/industrial shallow soil exposure (herein referred to as ESLs); 2) the April 2019 <br />Human and Ecological Risk Office (HERO), Human Health Risk Assessment (HHRA)- <br />Note 3 screening levels for commercial/industrial soil, published by the California <br />Department of Toxic Substance Control (herein referred to as DTSC-SLs); and 3) the <br />November 2018 Environmental Protection Agency (EPA) Region 9 Regional Screening <br />Levels for industrial soil (herein referred to as RSLs). Most of the sample data was <br />compared to the ESLs because they are generally the most conservative. Additionally, <br />water data was also compared to the July 2014 State of California Maximum Contaminant <br />Levels for drinking water (herein referred to as MCLs) and the California Hazardous <br />Waste Regulatory Limits (hazardous waste limit). <br /> <br /> <br />5.1. STRATIGRAPHY <br /> <br />The lithology of the site from surface grade to approximately 14 feet bsg is comprised of <br />fine-grained silty sands and fine- to coarse-grained sands. Clay was encountered in most <br />borings and wells between 14 and 15 feet bsg and extending to 20 feet bsg in some <br />locations. In most borings, silty sand grades into poorly graded sand at approximately <br />10 feet bsg. Groundwater was generally encountered in the poorly graded sands between <br />10 and 11 feet bsg and between 14 and 15 feet bsg in the former power plant area. The <br />surface elevation of the former power plant area is approximately 3.5 to 5.0 feet higher <br />than the surrounding area. <br /> <br />Hydrocarbon-like odor was observed in samples collected from boring B40 between <br />13 feet and 17 feet bsg. Organic vapor was detected using a PID in samples collected <br />from B33 and B34 at very low concentrations ranging between 1.0 and 1.3 parts per <br />million by volume (ppmv) and in samples collected from B40 at concentrations ranging <br />between 3.5 and 7.0 ppmv. Soil samples were collected for VOC analysis using EnCore <br />sampling devices from soil with PID detections. Organic vapor was not detected above <br />1.0 ppmv in the remaining soil samples. <br /> <br />Boring logs documenting lithologic observations and PID concentrations are included in <br />Appendix D and will be uploaded to the State’s GeoTracker website. Additionally, <br />lithology is depicted in cross-sectional view in Figures 6 through 9. <br /> <br /> <br />5.2. WASTE CELL DELINEATION <br /> <br />Glass processing waste was encountered in twelve (12) soil borings at varying depths. <br />Generally, the waste consisted of dry, small pieces of clear, bluish, and red glass mixed <br />with white-, red-, and black-colored crumbly and powdery solid residue. Limited pieces of <br />waste exhibited a bright orange color, and a faint burnt odor was observed in the glass <br />waste encountered in borings B16, B18, B20, B35 and B40.