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.--•.�. `,rte.� <br /> Ce010gicat Technics l/tc. <br /> 1101 71h street <br /> Modesto,California 95354 <br /> 12011122-4119/Fax(209)522-4227 <br /> Work Plan for <br /> rr Bioventing with Biosparging Pilot Test <br /> , L <br /> Mard Property <br /> L2969 Loomis Road <br /> Stockton, California <br /> Project No. 770.2 <br /> June 9, 2006 <br /> L " <br /> 1.0 INTRODUCTION <br /> L <br /> An underground storage tank containing diesel fuel was formerly located on the property - <br /> see Figures 1 & 2. A previous consultant, Wm. J. Hunter& Associates (WJH), installed four <br /> L groundwater monitoring wells in an effort to determine if diesel fuel had impacted <br /> groundwater. In 1992, diesel contamination was detected in groundwater at the site. The San <br /> Joaquin County Public Health Services/Environmental Health Division (SJC PHS/EHD) <br /> subsequently directed that an investigation of the diesel release be initiated. <br /> The work performed to date is summarized below*: <br /> • March 1987-Two 5,000 gallon diesel USTs removed. <br /> • March 1988 - UST excavation deepened to 29 feet below grade surface (bgs). <br /> Excavation was filled with clean backfill. <br /> • April 1992 - Three groundwater monitoring wells installed (MW-1 through MW-3), . <br /> Wm. J. Hunter& Associates. <br /> • May 1996-A single soil boring(LB-1)to 80 feet bgs installed, Lush Geosciences. .- <br /> • September 1997-Well MW-4 installation,Wm. J. Hunter&Associates.- <br /> August 2000 - Two shallow wells (MW-5 & MW-6) and one deep well (MW-105) <br /> installed, Geological Technics Inc. (GTI) <br /> • May 2002 - Two shallow wells (MW-7 & MW-8) and two deep wells (MW-104 & <br /> MW-106 installed, G <br /> No jZd# <br /> • October 005-v- even one Penetrometer Test (CPT) boreholes advanced with depth <br /> discrete soil and groundwater sampling, GTI. <br /> L <br />