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DECON Environmental Services, Inc. (DECON) prepared a work plan <br /> for soil remediation at the Stockton Steel Facility and submitted <br /> this work plan to the San Joaquin County Environmental Health <br /> Department (SJCEH) on January 7 , 1993. Comments on our work plan <br /> were received from Mary Meays, the SJCEH case worker assigned to <br /> this project, on January 25. This addendum to our work plan <br /> addresses Ms. Meays ' comments and will be incorporated by <br /> reference into the revised work plan for this project. <br /> A. Amount of Soil to be Excavated <br /> We estimate that the total volume of soil to be excavated during <br /> this project will be 150 to 300 cubic yards. If the excavation <br /> beneath location 03-E is extended beyond 18 ' bgs, the total <br /> volume of soil excavated may be close to 400 cubic yards. <br /> B. Sidewall Samples <br /> During the collection of confirmation samples at least three <br /> sidewall samples will be collected and analyzed. These samples <br /> will be taken from the sidewalls on the west side of location 2N, <br /> the east side of location 3E, and the south side of location 3E. <br /> `r The procedures for soil sampling and analysis will be identical <br /> to those described in section 3.2 of the work plan. <br /> C. Additional Excavation <br /> The soil sample(s) collected from 18 ' bgs at location 3E will be <br /> analyzed on a 24-hour turnaround. <br /> Additional excavation will be performed in this area if it <br /> appears to be warranted. Specifically, if the concentrations of <br /> TPH-Diesel remaining in the soil at 18 ' bgs are less than 1000 <br /> �- ppm, indicating that we may be able to attain acceptable <br /> concentrations by excavating a little further, we will extend the <br /> excavation to 20 ' or 22 ' bgs and resample. Our primary objective <br /> in performing this work is to reduce the concentrations of TPH- <br /> Diesel and BTEX remaining in the soil to acceptable levels prior <br /> to backfilling. <br /> D. Residual Contamination <br /> If the concentrations of TPH-Diesel and BTEX cannot be reduced to <br /> acceptable levels by overexcavation, we understand that <br /> ., additional site characterization and/or remediation may be <br /> required. <br />