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Soil generated during the removal of these tanks was transported by Thorpe Oil to a site owned by Chapin Brothers,Inc on Beyer Lane, east of the city of Stockton(Figure 1) The excavated soil was ' placed in a containment cell constructed of bales of hay and lined with plastic sheeting The stockpile was estimated at approximately 250 cubic yards Soil samples were collected from the stockpiled soil to characterize the extent of contamination present in the soil (Figure 2) Three samples were collected for every approximate 50 cubic yards of soil by removing 8 to 12 inches of soil from the surface of the pile and then driving a hand- operated percussion core sampler and clean stainless steel sleeve into the soil The sleeve was removed from the sampler and end caps and duct tape were used to seal the sample container Each sample was labeled and placed in iced storage until delivered to the environmental laboratory for ' analytical testing The three soil samples from each 50 cubic yards were composited by the laboratory and were tested for TPHg and BTEX The results of these tests indicated that relatively ' low concentrations of TPHg.were present in the soil (Table 1) SOIL REMEDIATION WORK Uncontrolled soil aeration was permitted by the San Joaquin County Air Pollution Control District because 1) concentrations of TPHg were relatively low, 2) the total amount of soil was only 250 ' cubic yards,and 3)the location of the proposed aeration was not upwind or near occupied residential property Stockpiled soil was spread over an access road through the orchard during late August, 1993, by the owner under the supervision of a State of California Registered Geologist The soil was spread to an approximate thickness of 8 to 12 inches over the surface of the road and allowed to aerate The soil was disced and then tilled at least once a week for approximately three months ' The aerated soil was sampled on November 26, 1993, to verify completion of the soil aeration project Three individual soil samples were collected for every approximate 50 cubic yards of soil These individual samples were composited by the laboratory for analytical testing The soil samples ' were analyzed for TPHg and BTEX using EPA Methods 8015 modified/5030 and EPA Method 8020,respectively,by Matrix Environmental Laboratories, Inc of Rancho Cordova, California All ' samples were collected using a hand-operated percussion core sampler by first removing the upper 2 inches of soil and then driving the sampler containing a clean stainless steel sample sleeve vertically through the soil layer so that the sample was collected near the bottom of the layer A ' composite sample consisting of three individual soil samples was collected from the native soil beneath the aerated soil layer to verify that gasoline contaminants had not leached during the project Sample locations are indicated on Figure 3 ' CONCLUSIONS ' Laboratory results of the analyses performed on the soil samples collected from the aerated soil layer indicated that TPHg and BTEX no longer were present in the soil at concentrations at or greater than the minimum detection limits of the laboratory methods Further, no odor of gasoline was detected during sampling The success of the aeration project was aided by the sandy consistency of the soil and the low initial concentrations of TPHg detected in the soil Contamination was not detected in ' 2731 QUAIL STREET DAVIS,CALIFORNIA 95616 916 7S6 1441 GE 004-010 srr 3 GRAYLAND ENVIRONMENTAL