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I Nomellini Property 3 - January 23 , 2012 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case <br /> • Soil Excavation : An unknown volume of impacted soil was removed and disposed <br /> offsite in November 1988 <br /> • In-Situ Soil/ Groundwater Remediation : Dual phase extraction and groundwater <br /> extraction , conducted from October 2009 through present, removed 3, 634 pounds of <br /> TPHg and 1 . 2 million gallons of contaminated groundwater. The rate of removal in the <br /> past quarter averaged 1 . 5 pounds of TPHg per day <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay. The depth to groundwater is approximately 13 feet bgs and the <br /> groundwater gradient is easterly at approximately 0. 0005 feet per foot <br /> •- Groundwater Trends: There are more than 20 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW-3) , near down gradient <br /> (MW-4) and far down gradient (MW-11 ) <br /> BENZENE Results for MW3 <br /> 120 — <br /> 10000 <br /> i0swo <br /> 000 <br /> 000 <br /> aoo t <br /> T T t <br /> al <br /> i <br /> de Oe 4e 40e 45e dfe Xe <br /> BENZENE Results for MW4 <br /> 4000 ill I <br /> 35W <br /> 3000 <br /> 2600 <br /> =2000 - - <br /> � 1500 <br /> 1000 <br /> 500 <br /> .♦ _: ^f <br /> BENZENE TMnd <br /> BENZENE Results for MW11 <br /> 12 <br /> 10 <br /> $ -:� ' <br />