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30 July 2018 AdvancedGeo <br /> AGE Project No. 18-4357 Environmental <br /> Page 4 of 5 <br /> All field procedures will be overseen by an AGE representative under the supervision of <br /> a California Professional Geologist. All workers present at the site will have attended the <br /> following program: Health and Safety Training for Hazardous Waste Worker — 40 Hour <br /> Training - 29 CFR 1910.120 e.3.i and T8 CCR5192 e.3.a. <br /> 4.3. SOIL EXCAVATION AND SAMPLE COLLECTION <br /> An area approximately six feet by six feet to an approximate depth of 3 to 5 feet bsg will <br /> be excavated around sample location S-1 utilizing a backhoe or similar excavator. The <br /> exact dimension of the excavation will be determined in the field based on visual <br /> inspection of soil and OVM readings. The purpose of the excavation is to remove the <br /> impacted soil in and around S-1. The proposed excavation limits are depicted in Figure 1. <br /> Excavated materials will be stockpiled at the surface on plastic (10 mil) sheeting and <br /> stockpile soil samples will be collected and analyzed from the excavated material for the <br /> chemicals listed in Section 3.4. One stockpile sample will be collected for every 25 cubic <br /> yards of excavated material. Based on the results of the stockpile sampling, the material <br /> will be evaluated and disposed at an appropriate landfill. If hazardous waste is <br /> encountered based on laboratory analysis, a profile for hazardous waste disposal will be <br /> prepared and the effected media will be transported to an appropriately permitted disposal <br /> facility. <br /> Once the impacted soil has been excavated and the limits established based on field <br /> observations, soil samples (confirmation) will be collected from each sidewall and the <br /> base of the excavation for the chemicals listed in Section 3.4. Confirmation soil samples <br /> will be collected following the same procedures as outlined in Section 3.2. Confirmation <br /> soil sample locations are depicted in Figure 1. The excavation will remain open until <br /> receipt of analytical results. Based on the results of the analytical data, AGE will either <br /> propose additional excavation to remove impacted soil or backfill the excavation with <br /> clean imported backfill material. As discussed above, the analytical results will be <br /> compared to the clean-up goals to determine if additional soil removal is necessary. <br /> Additional soil removal will only be conducted with approval of the oversight. <br /> 4.4. WASTE DISPOSAL <br /> Based on laboratory analysis of soil samples, excavated materials will either be backfilled <br /> into trenches or properly disposed of at the appropriate disposal facility. Non-hazardous <br /> waste not appropriate for backfill will be transported by LD Transportation LLC and <br /> disposed at Forward Landfill in Stockton, California or Recology Hay Landfill in Vacaville, <br /> California. Hazardous waste will be transported by Dillard Trucking or Advanced <br /> Chemical Transport (ACT), both licensed hazardous waste haulers. Hazardous waste will <br /> be disposed at a Class I Landfill. The Class I Landfill will be determined based on the <br /> amount of material and an evaluation of the costs associated with available Class I <br /> Landfills. Hazardous waste will likely be disposed at Clean Harbors in San Jose, <br /> California or an out of state facility. <br />