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I <br /> • Corporation <br /> 1921 Ringwood Avenue <br /> San Jose, CA 95131-1721 <br /> Tel. 408.453.7300 <br /> Fax.408.4379526 <br /> the group <br /> A Member of The IT Croup <br /> s� <br /> March 7, 2002 <br /> Project 828576 0 <br /> Mr. Mike Infurna MAR Q g 2[)02 <br /> San Joaquin County Public Health Services. EALI" <br /> Environmental Health Division E\pE4�d,1 ti ; Ei;V',CES <br /> 304 E. Weber, Third Floor <br /> Stockton, CA 95202 <br /> Re: Variance from Permit SR#0027293 <br /> Former Shell Central Valley Crude Oil Pipelines <br /> Hansen Road <br /> Tracy, California <br /> Dear Mr. Infurna: <br /> IT Corporation(IT)has prepared this letter on behalf of Shell Oil Company as per your <br /> request to document changes in planned activities at the above-referenced site. <br /> IT completed a total of twenty-four soil borings under permit SR#0027293 numbered B-1 <br /> through B-24. Borings B-1 through B-4 were completed utilizing direct-push technology. <br /> Due to the nature of the materials encountered, B-5 through B-24 were completed using a <br /> hollow-stem auger drilling rig with 6-inch augers. An additional seventeen borings, <br /> numbered B-25 through B-40 and B-42, were completed under permit SR#0028708 <br /> utilizing direct push technology. <br /> All borings were advanced to first encountered groundwater, ranging from 32 to 38 feet <br /> below ground surface and backfilled using tremie pipe and neat cement grout to <br /> approximately 3 feet below ground surface. <br /> The anticipated remaining seven step-out borings for this site are on hold briefly until all <br /> analytical results are reviewed. <br /> NAPROJECTSUT GROUP\SHELL OIL\NEW FOLDERWOURCATION LETTER.DOC <br />