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King Island Resort 3 - January 30 , 2012 <br /> Site History/Assessments <br /> In April 1989, soil contamination was identified by subsurface monitoring . To date , <br /> 17 monitoring wells have been installed and monitored regularly. <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case <br /> • Soil Excavation : An estimated 40 cubic yards of impacted soil was removed and <br /> disposed offsite in 1989 <br /> • In-Situ Soil Remediation : No soil remediation noted <br /> • Groundwater Remediation : Ozone injection pilot test, conducted February through <br /> July 2011 <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand , <br /> silt, clay and peat . The depth to groundwater varies seasonally between 1 and 18 feet <br /> bgs and the groundwater gradient is east and northeast at approximately 0 . 04 ft/ft. The <br /> closest surface water is the San Joaquin Delta located immediately adjacent to the Site. <br /> • Groundwater Trends : There are more than ten years of groundwater monitoring data for <br /> this Site . TBA trends are shown below, source area (MW-7) , near down gradient <br /> (MW-6) and far down gradient (MW-8) <br /> TERT-BUTYL ALCOHOL (TBA) Results for MW7 <br /> 70000 <br /> 60000 <br /> _ 50000 <br /> 9 40000 -- <br /> 0000 <br /> 20000 <br /> 10000 <br /> 0 T p <br /> o`' a' -Add �i' ,i 00v <br /> T-BUTYL <br /> HOLA) Trend <br /> TERT-BUTYL ALCOHOL (TBA) Results for MW6 <br /> 3500 - - - - <br /> woo <br /> 2500 I .— ._ _ _ f. _ •_ _ - _ — <br /> 2000 <br /> 500 <br /> 040 40e 40e Joe <br /> - , <br /> L_ _RT-OUTYL ALCOHOL (TBA) � Trend � <br />