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Covenant Environmental San Joaquin County 8 May 1990 Air Pollution Control District 1601 East Hazelton Ave. Stockton, CA. 95201 Att: Jorge de Guzman An authorization for uncontrolled soil aeration was applied for on 8 February-1990 by COZAD TRAILERS, 4907 East Waterloo, Stockton. This authorization was received 26 February 1990. The total volume of the contaminated soil was less than ten cubic yards; This soil had been moved from the excavation site to the extreme southeast corner of the property where it was deposited on and covered with "poly" sheeting material. This 'anerobic' state was maintained for more than three months to favor the soil decomp- ositiou bacteria which degrade the long-chain (nonvolatile) hydro- carbons of the diesel fraction. The soil was unwrapped, spread to �i approximately a four inch depth, and turned daily during the last week of March. Sampling was performed by Canonie Field Analytical [Colleen Andreatta] and this author. Soil cores were removed from the four corners and the middle of the aeration zone prior to be composited by the labora- tory for analysis. Requests for analyses were for Total Petroleum Hydrocarbon (TPH) gasoline and Diesel. The aromatics [Benzene, Toluene and Xylenes] were not requested since all the previous data had failed to indicate the presence of any except Xylene and this at only 5.6 mg/kg. SAMPLE ANALYTICAL RESULTS PRIOR TO FOLLOWING AERATION AERATION TPH..GASOLINE 90 mg/kg TPH..GASOLINE N.D. Limit: I mg/kg TPH..DIESEL 190 mg/kg TPH..DIESEL N.D. Limit 10 mg/kg* ------ - ----- Cha in-of-Custodies-and--Analytical--Resu It s--are-attached. ---- --- - - -`- - --- -------r * The original sample for TPH-D showed erratic results; The soil was resampled and sent to another laboratory[Precision Analytical Richmond] 0 Dorado County Solano County P.O.Box 1006 P.O.Box 561 Lotus,CA 95651 Fairfield,CA 94533 '916)626.0918 (707)425-8927