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1117 Lone Palm Avenue <br /> Suite B <br /> Modesto, CA 95351 <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A S S O C 1 A T E S I N C . <br /> April 3, 2000 <br /> 62500 <br /> Mr. Jeff Wong <br /> San Joaquin County Public Health <br /> Services, Environmental Health Division <br /> 304-E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Workplan Addendum for Additional Subsurface Investigation at Continental <br /> Grain, 1805 Harbor Street', Stockton, California <br /> i <br /> Dear Mr. Wong: H <br /> ATC Associates Inc. has prepared this workplan addendum on behalf.Conti Group for the <br /> performance of additional subsurface investigation activities.at the above referenced site. The <br /> purpose of the additional activities is to evaluate.the horizontal and vertical extent of impacted <br /> `soil and groundwater of the site: This workplan addendum has been prepared in response to San <br /> Ioaquin County , Public . Health Services Environmental Health Division (PHS/EHD) <br /> correspondence dated March 20,'2000. ATC's Workplan for Additional Subsurface Investigation <br /> at Continental, Grain, 1805 Harbor Street,. Stockton, California, dated June 28, 1999 was <br /> approved by PHS/EHD on July 1, 1999 with minor modifications. <br /> The additional scope of work includes advancing one deep°soil boring in the center of the <br /> hydrocarbon. plume,. soil and -groundwater sampling; laboratory analysis of selected soil and <br /> groundwater samples, performing a well survey, .and preparing a summary report. The scope of I� <br /> work is described in detail in the following paragraphs. <br /> SCOPE OF WORK <br /> Advancement of Deep Soil Boring <br /> To evaluate .the vertical.extent of soil and groundwater contamination at the site, one soil boring <br /> will be advanced to a depth of approximately 50 feet. below ground surface (bgs) utilizing a <br /> hollow stem auger equipped drill rig. The boring will be placed in the vicinity of former soil <br /> boring S132, which contained the highest concentration of total petroleum hydrocarbons as diesel <br /> (TPHd) in groundwater. The proposed deep boring location is shown on Figure 2, which also <br /> depicts the revised off-site boring locations. <br /> wA625001reportslwkp iiadd.doc <br /> I <br /> i� <br /> i <br />