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re <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street � r/ j ;�-a <br /> Escalon California 95320 G� !Ln�f-'I ,l i� L' <br /> Ul_:) <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> F_i\lW,`())NfV!ENJ_ iENJF! <br /> September 24, 2008 PERNA!1T/SERViCFC <br /> Mr. Michael I-d=a /LA 16 <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street v <br /> Stockton, CA 95202 <br /> Subject: Addendum-to-the Workplan for Soil Vapor Extraction/Air Sparging Pilot Test <br /> -- and-Additi6i al,Groundwatei��=lnves�t gatron dated-September`5T 2008" — — �— <br /> Harry's Auto, 2662 N. Wilson Way, Stockton, California <br /> Mr. Infurna: <br /> This Addendum is submitted by Ground Zero Analysis, Inc. (Ground Zero) to request <br /> authorization to change the drilling method for the "Additional Groundwater Investigation" <br /> proposed in the Workplan for Soil Vapor Extraction/Air Sparging Pilot Test and Additional <br /> Groundwater Investigation dated September 5, 2008. <br /> Additional Groundwater Investigation <br /> In an effort to reduce soil cuttings and limit the impact to the county right-of-way, Ground Zero <br /> proposes the following changes to the original workplan. <br /> The EHD letter dated August 6, 2008 addressed concerns with the potential for petroleum <br /> —--�- <br /> contamination to=be-in=the- oundwater="outboard"-of MW5=and'-east=of MW3-and-MW4: -GroLnd - - <br /> Zero proposes advancing(two direct push borings and collecting groundwater samples at the <br /> locations shown on Figure . � &A' . 41 .,dt,anee the b ,i - ., drilling withequipped <br /> night ine �diameter hullo stem au o Gregg Drilling will advance the direct push berings will <br /> b dfille rods to the capillary fringe and a hydropunch tool will be advanced inside the augers into <br /> the water table and groundwater samples collected. After groundwater samples have been collected <br /> the boreholes will be grouted to surface and covered with an asphalt patch. <br /> GAGROUNDMHARRYS AUTO\Reports\Workplans\addendum wp sve pilot test.doc <br /> � I <br /> � I <br />