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WALLACE•KUHL&/ASSOCIATES,INC. <br /> November 1, 1991 <br /> Mr. Ali Othman <br /> San Joaquin County <br /> Air Pollution Control District <br /> 2321 W. Washington Street,Suite I <br /> Stockton,California 95203 ...... . <br /> COMPLE714ON OF SOILS AERATION <br /> LAT,gROP PROPERTY <br /> sal East 771omsen Road <br /> San Joaquin County APN: 195-121-30 <br /> Lathrop, California <br /> W KA No. 1184.02 <br /> Dear Mr. Othman, <br /> As requested by property owners Raymond Quaresma and Steve Mothershed,we have prepared this letter <br /> ion at the above-referenced site. The soils remediation <br /> transmitting the results of uncontrolled soil aerat <br /> was accomplished in accordance with a January 21, 1991,Application for..uthorization of Uncontrolled <br /> Soil Aeration. <br /> Approximately 360 cubic yards of petroleum hydrocarbon-contaminated soils were excavated and <br /> stockpiled at the subject property in January, 1991. The stockpiled soils were subsequently spread on <br /> construction grade polyethylene across an approximate 18,800-square foot area for aeration. Only 25 <br /> cubic yards of soils,however,were aerated at any one tune;the remainder of the contaminated soils was <br /> tory field observations,to <br /> kept covered until each 25 cubic yard unit appeared,based on visual and olfac <br /> have completely aerated. <br /> After it appeared that all the aerated soils had been successfully rernediated,the entire aeration area was <br /> divided into a sampling grid (Plate 1); twenty-two samples were obtained from the aeration area on <br /> September 3, 1991, in clean,two-inch diameter brass tubes. The sample tubes M ere sealed with PTFE- <br /> September submitted andel chain-of-custody to a <br /> coated sheets, plastic end caps and tape, preserved on ice an <br /> California certified laboratory for analysis of total petroleum hydrocarbons FPA method 8015 <br /> (T,�'H, <br /> modified)and benzene, toluene,xylene and ethyl benzene(liT3t&E,EPA met�iad 8(?0). The samples <br /> were composited at the rate of two-into-one by the laboratory prior to analysis. <br /> ;;37^.1:;;; F�,X(91U):i72. <br />