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y Cobenan t <br /> Environmental IVED <br /> MAY 2go <br /> ENVIRONMRRVI <br /> f .� <br /> F$�� 'ILHALTI�San Joaquin County CES <br /> +i <br /> Air Pollution Control District <br /> + 1601 East Hazelton Ave. <br /> Stockton, CA. 95201 <br /> Att: Jorge de Guzman <br /> An authorization for uncontrolled soil aeration was applied for on <br /> 8 February 1990 by COZAD TRAILERS, 4907 East Waterloo, Stockton. <br /> .:This author ization ,was-received_26.,February ?1990.,, <br /> The total volume of the contaminated soil was less than ten cubic <br /> yards; This soil had been moved from the excavation site to the <br /> extreme southeast corner of the property where it was deposited on <br /> and covered with "poly" sheeting material. iThis "anerobic' state <br /> was maintained for more than three months to favor the soil decomp- <br /> osition bacteria which degrade the long-chain (nonvolatile) hydro- <br /> carbons of the diesel fraction. The soil was unwrapped, spread to <br /> approximately a four inch depth, and turned+daily during the last <br /> week of March. <br /> Sampling was performed by Canonie Field Analytical [Colleen Andreatta] <br /> and this author. Soil cores were removed from the four corners and } <br /> the middle of the aeration zone prior to be �composited by the labora- <br /> tory for analysis. Requests for analyses were for Total Petroleum <br /> Hydrocarbon (TPH) gasoline and Diesel. The aromatics [Benzene, Toluene <br /> T and Xylenes]-' ere"riot requested`'sinceall the previous -data`had'f5fled <br /> to indicate the presence of any except Xylene and this at only 5.6 mg/kg. <br /> SAMPLE ANALYTICAL RESULTS <br /> I � <br /> PRIOR TO FOLLOWING`I AERATION ; <br /> AERATION <br /> TPH. .GASOLINE 90 mg/kg TPH. .GASOL'INE ;;N.D. Limit: 1 mg/kg i <br /> TPH. .DIESEL 190 mg/kg TPH. .DIESEL ;N.D. Limit 10 mg/kg* <br /> Chain-of-Custodies and Analytical Results are attached. <br /> �i <br /> * The original sample for TPH-D showed erratic results; The soil was <br /> resampled and sent to another laboratory[Precision Analytical Richmond] <br /> f <br /> EI Dorado County Solano County f <br /> P.O. Box 1006 P.O. Box 561 <br /> Lotus, CA 95651 Fairfield, CA 94533 <br /> (916)626-0918 (707) 429-8927 ' <br /> i <br />