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7 <br /> Geofogicaf Technics Inc. <br /> 2741 River Rwd <br /> Madcsm,ceifor,= 95351 <br /> (209)538-6424/}-,#538-5852 <br /> i <br /> Interim Remedial Action Plan <br /> Former Moresco Property <br /> 1.6865 Gawne Road <br /> Stockton, California . <br /> Project No. 251.3 <br /> April 8, 1997 <br /> f � <br /> 1.0 INTRODUCTION <br /> On behalf of Mr. Michael McGranahan,'Trustee In Bankruptcy, Geological Technics Inc. has <br /> performed environmental assessment work at the Former Moresco Property located at 16865 <br /> Gawne Road in Stockton. <br /> The subject property Yhad a 500 gallon capacity underground storage tank ST} once used <br /> for residential automotive fuel supply. The UST was removed on November 15, 1994 and <br /> significant concentrations of gasoline range petroleum hydrocarbons were detected in a soil <br /> sample collected beneath the former tank cradle at depth of 17.5 feet below ground surface <br /> E (bgs). This information was reported to the San Joaquin County Public Health Services <br /> Environmental Health Division (SJCPHSEHD) in the Geological Technics Inc. Tank <br /> Removal Report, 16565 Gawne Road, dated December 9, 1994. <br /> A subsurface investigation designed to define the vertical and lateral extent of the impacted <br /> area was proposed in the Geological Technics Inc. Site Characterization Work Plan dated <br /> March 14, 1995. The Work Plan was approved by the SJCPHSEHD on April 3, 1995. <br /> An initial subsurface investigation was conducted April 5 to 7, 1995 and a remobilization <br /> occurred-on April 21, 1995. The results of this investigation indicated that the vertical extent <br /> at or near the point of release was defined. The lateral extent remained undefined to the north <br /> and east. This information was documented in the Geological Technics Inc. Soil Boring <br /> Installation Report dated May 12, 1996. <br /> Additional site characterization work was conducted on June 17 & 18, 1996. During this <br /> work three additional soil borings were drilled and soil samples collected. in summary, low <br /> levels of BTEX� compounds were found in SB-5 and 6 indicatingthe were at or verynear <br /> l'I the lateraextent of he impacted soil, and relatively high levels of MTBE were MTBE in <br /> one interval from S13-7. This data and a discussion may be found in Geological Technics Inc. <br /> Site Characterization Report dated October 11, 1996: <br /> t � <br /> f <br />