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ii <br /> Geofogica(Technialnc.- <br /> 2 741 <br /> JCI er Read <br /> Modesto,Cagif?nia 95351 <br /> (2 09)538-64.241Fa0 538-5852 <br /> Addendum No.'2 to the October 13, 1995 <br /> Additional Site Characterization Work Plan <br /> Former Moresco Property <br /> 16865 Gayvne Road <br /> Stockton,-California <br /> Project No. 251.2 <br /> February 9, 1996 <br /> 1.0 INTRODUCTION <br /> In response to Mr. Ron Rowe's letter;dated'December 28, 1995, Geological Technics <br /> Inc. has prepared this second addendum to our October 13, 1995 Additional Site <br /> Characterization Work Plan. <br /> The first addendum.listed specific personnel and companies chosen to perform the <br /> investigation. In the interest of cost effectiveness, the first addendum also proposed <br /> that the exploratory borings be converted into a groundwater monitoring well, soil <br /> vapor extraction, and a multi level vapor monitoring well. Because interim remedial <br /> action feasibility testing was deemed',to'be not warranted by'the LOP we'.amend the <br /> proposed boring conversions to grout columns. <br /> It is proposed that this investigation focus on further defining the vertical and lateral <br /> (north and east) extent of contamination and gathering evidence to assess the <br /> candidacy of the site for a risk based closure. <br /> 2.0 PROPOSED WORK; <br /> 2.1 Subsurface Exploration Work <br /> i <br /> To further investigate the lateral and vertical extent of soil impacted by gasoline <br /> range petroleum hydrocarbons from the former UST at this site, Geological Technics <br /> Inc. proposes to advance two boreholes down to the capillary fringe (about 90 to 100 <br /> feet). One of the boreholes will be to the north (SB-5) and the other borehole will be <br /> east (SB-6) of the point of release (Figure 1 Site Map). SB-5 is proposed to be placed <br /> 4 <br />