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21 July 2015 <br /> AGE Project No. 14-3154 <br /> Page 13 of 15 <br /> specific field conditions (obstructions, visible signs of contaminated soils or other <br /> factors). <br /> The trenches are proposed to be 18 inches wide, a minimum of five feet bsg in depth <br /> and approximately 25 feet in length. If no more than 1 cubic yard of waste is <br /> encountered, then the excavation spoil waste (impacted media removed below the <br /> stabilized soil cover) will be considered de minimus. <br /> If hazardous waste is encountered based on laboratory analysis, waste will stockpiled <br /> on plastic (10 mil) sheeting for evaluation and disposal at an appropriate landfill. A <br /> profile for hazardous waste disposal will be prepared and the effected media will be <br /> transported to an appropriately permitted disposal facility. Based on the current soil <br /> borings and trench soil sampling, including stockpile soil samples, hazardous waste has <br /> not been encountered at the site. <br /> Soil samples will be field-screened using an organic vapor meter and RKI methane <br /> (four-gas) meter. The trenches excavated by the backhoe/excavator will be screened <br /> using a RKI methane (four gas) meter capable of measuring concentrations of methane, <br /> hydrogen sulfide, oxygen, lower explosive limit and potentially carbon monoxide. The <br /> trenches will be backfilled with native soil. <br /> All field procedures will be overseen by an AGE representative working under the <br /> supervision of a California Professional Geologist. Procedures for collection and <br /> analysis of soil samples, equipment decontamination and sample handling are <br /> presented below. Photographs will be taken at each sampling location and at <br /> surrounding areas. The photos will verify information entered in the field logbook. Each <br /> photo taken will be written in the logbook with the approximate time, date, and location. <br /> A trench log for the field work is included in Appendix C. <br /> SOIL SAMPLING — TRENCHING <br /> Soil samples will be collected from the soil column at the base of the trenches which <br /> demonstrate waste or are required to evaluate the lateral extent of the waste; soil <br /> sample collection will be determined based on the quantity of waste encountered in <br /> each trench. However, to fill any data gaps which were not fulfilled during the December <br /> 2014 and April 2015, soil sampling will likely be required to ensure, reuse or backfill of <br /> the soil is practicable. <br /> Additionally, to satisfy the CalRecycle and Regional Board directives to analyze for an <br /> expanded set of chemicals from within the current stabilized cover area, soil samples <br /> will be re-collected from the initial trenches advanced and selectively analyzed for <br /> production waste chemicals. <br /> Advanced GeoEnvironmental,Inc. <br />