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a ` ' <br /> ` Marci'srDiesel Service -=3 `'/ ;,: .November".:28,.201,1 <br /> Remediation Summary <br /> • Free Product: sheen in MW-4, MW-5; and MW-7, sheen last noted in June 2009. <br /> • Soil Excavation: excavation, unknown volume, was conducted to 29 feet below grade <br /> • In-Situ Soil/ Groundwater Remediation: Dual phase extraction pilot test, conducted in <br /> August 2010, removed approximately 5 pounds of TPHg <br /> • Groundwater Remediation: Air sparging, proposed <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed gravel, <br /> sand, silt and clay. The depth to groundwater at approximately 47,feet bgs and the <br /> groundwater gradient is north at approximately 0.001 feet per foot <br /> • Estimate of Hydrocarbon Mass in Soil: Prior to remediation, Geological Technics Inc. <br /> estimated that approximately 108,000 pounds,of TPHd remained in soil and 1 to 8 <br /> -` pounds dissolved in groundwater. . <br /> -w---• Groundwater Trends r�Tth <br /> here are-more- anr11:.years-of4groundwater monitoring data,for <br /> this Site. TPHd and depth to groundwater trends are-shown below, source area (MW-7-- <br /> and MW-4) and down gradient (MW-3) <br /> DIESEL RANGE ORGANICS Results.for MW-7 IM „ •. <br /> - . 12000 �. I -43 * .. <br /> Z <br /> { .. <br /> 10000 --:"4__ "__ 48 <br /> � 8000___-.� ____I_____ —_-_ __.. _-53 +• ,, i.: 4 � - - , <br /> rt <br /> 'S9 - <br /> t.. <br /> i. I ...i ' <br /> r <br /> d { <br /> 4000 <br /> zoio sa T �' + I tr <br /> _ * �y ! w <br /> . <br /> 0- <br /> 4 <br /> 4 . a1011, <br /> S.s'.. .fit' ,ey� � ^d' ,.r'� ��~ c... r�' _•,:' <br /> h ,: - F t •Yr DIESEL RANGE ORGANICS Depth to Water <br /> _ DIESEL RANGE ORGANICS Results for MW-4 <br /> AI - 42 r . <br /> _ 4500 <br /> SOOO <br /> Y' <br /> _1 4000 }._ - .. ._ 47 <br /> ' �3000 � -.; r --,.�+n• ..;�+,... ,..-. +.... _ " <br /> I <br /> 52 <br /> ..tQ.i %'+F, 2500 <br /> I 4 <br /> .. <br /> 20001---- 6 <br /> 2 <br /> 5 <br /> 1500 1 <br /> __ate <br /> -72 <br /> . <br /> l <br /> - `.ti ,•�- _.•+• DIESEL RANGE ORGANICS + Depth to Water ++.. Trend <br /> • <br /> p ' <br /> a <br />