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A <br /> . . FILE COP] <br /> ENVIRONMENTAL HEALTI� )EPA <br /> ` RTMEI®T'I' <br />� aQurN q <br /> Fil <br /> c SAN,JOAQUIN COUNTY <br /> „oG <br /> Donna K.Heran,R.E.H.S. Unit Supervisors <br /> rX <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E,H.S. <br /> Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. <br /> 'Stockton, California 95202-2708 <br /> e4Cfi`o �PProgram Manager Douglas W.Wilson,R.E.H.S. <br /> Laurie A.Cotuila,R.E.H.S. Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. F <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S, <br /> Mark Barcellos,R.E.H.S. <br /> JAMES GIOTTONINI <br /> PUBLIC WORKS -DIRECTOR <br /> CITY OF STOCKTON <br /> 425 N EL DORADO ST I <br /> STOCKTON CA 95202 <br /> RE: 110 W SONORA ST SITE CODE: 1253 <br /> FIRE STATION #2 <br /> STOCKTON CA r <br /> NVORKPLAN: Prefimiqa Site Assessment Work Plan—South UST Area DATED: Tune 20.2002 <br /> PREPARED BY: Advanced GeoEnvironmental Inc. <br /> APPROVED <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25299.37,subd.(c)(3).): <br /> 1. Four push probe borings to 30 feet below surface grade to collect soil and grab water <br /> samples for the purpose of assessing lateral and vertical extent of the contamination- ! <br /> COMMENTS AND CONDITIONS: <br /> w <br /> I. Advance soil borings to at least 50 feet below surface grade (bsg) to collect grab water I! <br /> samples. Historical lowest depth in the area is between 40 and 50 feet bsg according to San <br /> Joaquin County Flood'Control Lines of Equal Depth for 1978. Groundwater depth <br /> measured in monitoring wells at the nearby site PG&E Former Manufactured Gas Plant Site <br /> in 1992 was approximately,46 to 47 feet bs Joaquin Coun Environmental Health <br /> g• San J q tY. ; <br /> Department recommends installing additional discrete borings to obtain grab water samples <br /> below the current groundwater table which is estimated to be about 20 to 30 feet bsg to <br /> control cross-contamination from the upper zones. M <br /> i <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25299.37, subd.(C)(3).)-. <br /> None [ `� <br /> DATED -Z` Z'D C) 2 BY Uj <br /> Cc: CRXVQCB,Central Valley Region—Marty Hartzell <br /> Cc: Advanced GeoEtivironmental,Inc.—Bill Little <br /> .a t <br />