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Western Lift -`:3 - ,.April 2012 <br /> • In-Situ Soil Remediation: Soil vapor extraction, conducted from February 2005 through <br /> present removed approximately 3,110 pounds,of TPHg. In April 2010, the rate of <br /> removal was < 2 pounds of TPHg/day. <br /> • Groundwater Remediation:. -No groundwater remediation has been conducted. ' <br /> i <br /> y 3 , <br /> i <br /> General Site Conditions. x <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay. The depth to groundwater is approximately 23 feet bgs and the,- <br /> groundwater gradient is.northeast at a gradient of 0.0027 ft/ft: <br /> • Groundwater Trends: There are more than 19 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW-7), near down gradient. <br /> (MW-8B) and far down gradient.(MW-10) y " <br /> BENZENE Results for MW-7 , <br /> - 20000 , I ! <br /> 18000 <br /> -18000" _ <br /> 4.. <br /> 4 r, a i <br /> 14000 <br /> 12000' <br /> 10000 <br /> 4 <br /> e <br /> a000 <br /> , m i <br /> 8000 <br /> 4000 <br /> 2000 # <br /> - • rrc,.:.z.,BENZENE a.*n d <br /> BENZENE Results for MW-8B <br /> y 25000 <br /> 20000 <br /> _ <br /> » 15000 ��jj4 �•`—`,'+a L _____� -- ----4`- ., 'f `^ _ <br /> NO <br /> 10000 _ ::§ `_ ` �.^: s.. . .t F; <br /> - - <br /> 5000- <br /> 0, <br /> 000 <br /> h <br /> Bs`ENZENE....« Trend.) <br /> s <br /> BENZENE Results for MW-1.0- <br /> m <br /> j0,3- <br /> 0.2 <br /> 3 <br /> a �1 <br /> do <br /> 0 <br /> r� B t <br /> R"' ENZENE-+.+. Trentl <br />