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ko <br /> the contamination was found in B-3NW-7 at 80 feet The soil found at 60 and 75 feet bgs is a <br /> pure clay and no contamination was found <br /> In 1993 we measured the Hydraulic Conductivity and found it to be 15 feet per day At that time <br />' the water table was 50 feet below the surface and the water was flowing in a silty sand Below <br /> about 58 feet the soil changes to clay or silty clay The hydraulic conductivity in a clayey soil will <br /> be much less, probably around 1 feet per day The groundwater flow in this soil will be much <br />' slower <br /> FUTURE WORK <br /> I <br /> We will install the sparging system and connect the vapor extraction well to the Thermal Oxidizer <br />' We plan to air sparge the tank pit at this site which we believe will remove most of the remaining <br /> contamination The sod above 32 feet bgs has been cleaned with the vapor extractor as of <br /> January 1999 The soil between 30 and 40 feet bgs has been partially cleaned through vapor <br /> extraction <br /> Yours truly, <br /> /JjoCussen REQ <br /> RG #6506 �S'�E C<0 <br /> C�SSF���� <br /> Enclosures 2 <br /> 1 Figure NO. <br /> 2 Boning Logs <br /> Distribution 9�OFC, Fo <br /> Mr Roger Liston, Darpetro, Inc <br /> Ms Carol Oz, San Joaquin County EDH <br /> Mr Gordon Boggs, RWQCB Sacramento <br /> I <br /> 5 � <br />