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j Curtiss Pontiac_-Cadi1W 3 "* February 24, 2011 <br /> Claim No. 12228 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case. <br /> • Soil Excavation: An estimated 1,500 cubic yards of impacted sail was removed and <br /> disposed offsite in 2003..An estimated 1913 pounds of TPHg was removed by <br /> excavation <br /> • In-Situ Soil Remediation: No in-situ soil remediation has been conducted. <br /> + Groundwater Remediation: Ozone sparging is proposed. <br /> .z <br /> General Site Conditions <br /> Geology arid Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay: The depth to groundwater varies seasonally between 6 and 9 feet bgs and <br /> the groundwater,gradient is north at approximately 0.006 feet/foot. <br /> Mass Remaining: An estimated 397 pounds of TPHg remain in site soil. <br /> • Groundwater Trends: There are more than 12 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, near and far down gradient of,the source <br /> area, respectively., <br /> } <br /> y( <br /> BENZENE Results for`MW1:8 <br /> �: <br /> .. .. ry- 2000-# <br /> 1600 <br /> 1600 x <br /> -- <br /> - <br /> . <br /> :.. .....,..,.,........:...._..._......,.� .._ ..,......_. .,. ..,..,�.._. ..-,. 1000 ....-:a ; ,t-:;..�.. .a,,.t'.. ��:�......,...-�. , - - -- <br /> _600 I i <br /> # aeus'BEFSZ�NE t# <br /> , <br /> N <br /> f <br /> t -7 <br /> BENZENE Resu{ts-far MW4 - - -- —- - -'- i <br /> . . <br /> 1240 t r ` <br /> 1000 _ <br /> 80o <br /> 800 <br /> � F <br /> 400. ---. <br /> 200 �.,....-. -�_. - .,+.—._._._.:___..,:....._.......rte_�_. -..,...._ - • . <br /> -u <br /> BENZENE `` Y <br /> .e r <br /> k <br /> P <br /> fo nta EnilronmentatProtecdon Agency . <br /> • CaIt r <br /> - E <br /> Recycled Paper <br /> r <br />