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' with instructions to test for benzene, toluene, xylene, and TRPH. The results of that analysis, (TABLE LV & EXHIBIT- F. ) showed that only motor oil was above detection limits The spoil removed from the waste oil site was also sampled, and tested as above, it too only indicated motor oil , (TABLE IV & EXHIBIT F ) The excavation was filled by placing clean fill on bottom and covering it with the removed spoil.. The excavations were later covered with asphalt In October, 1989, the owners removed a portion of the asphalt, and hand angered to about 23 feet in approximately the middle of the site of the removed waste oil tank, where a soil sample was taken Laboratory analysis measured oil, (as motor oil, ) at 289 mg/kg_ However, since no attempt was made to properly clean the 1 auger between runs, proper field sampling and preserving tech- niques were not followed or documented, and the work was not witnessed by properly Licensed personel, the laboratory results ' cannot be considered as indicative of actual conditions After completion of the boring, it was reported that the removed spoil was returned to the hole and covered with asphalt No work has been done on the site since the above sampling was done On August 18, 1993, the San Joaquin County PHS, Environmental Health Division, wrote to the owners stating that since contam- ination was indicated beneath the waste oil tank, a workplan for investigating the extent of that contamination must be submitted to the County EHD by October 1 , 1993, and the work must be com- pleted by November I A copy of that correspondence is attached as EXHIBIT G The following workplan has been prepared to address that directive. I WORKPLAN FQR INVESTIGATING THE EXTENT OF SOIL QONTAMINATION ENCOUNTERED BELOW A 150 GALLON WASTE OIL TANK ON THE SITE. ' NOTES-- I OTES_I The removed waste oil tank was within 3-4' of the westerly ' property line, which is adjacent, to a single family dwelling_ It is not planned to place any soil borings offsite at this time, if the results of this work indicate that contamination may have migrated off the property, any necessary additional work will be addressed after analyzing all the data- 2 Underground utilities will be identified and located prior to ' commencing operations_ 3 _ An application for a drilling permit, together with the necessary fee, is attached to this workplan 4