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T&T Trucking =3 " t,. April 2012 <br /> Remediation Summary " <br /> Free Product: No free product was-documented throughout the life of this case? <br /> • " Soil Excavation: Approximately 50 cubic yards of contaminated soil was excavated and <br /> rt, .. <br /> removed from the site in 1999. ` ' <br /> .In-Situ Soil/ Groundwater Remediation: Soilvapor extraction and air sparging, <br /> conducted from April 2008 through December 2010, total of 15,673 hours, removed% <br /> approximately 6,437 pounds of TPHg., is �r �, . e t , <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixedsand, <br /> silt and clay. The depth to groundwater is approximately 76 feet'bgs and the A <br /> groundwater gradient is variable at between 0.003 and 0.007 fUft .zv d. !:a ' .:, 1 i_W <br /> *, Estimate of Hydrocarbon Mass in Soil: Prior to remediation, AGE estimated,that <br /> approximately 2183 pounds of.TPHg resides:.in the subsurface. . <br /> • Groundwater Trends: There are more than 16 years of groundwater monitoring data for <br /> this'Site, MTBE trends are shown below, source area (MW-1) and down"gradient' � *; <br /> s�. a <br /> METHYL-TERT-BUTYL ETHER(MTBE)Results for MW1 ,b: � �c•�, : j, �. <br /> J. <br /> A60000 "' <br /> 120000- <br /> I OOGOO <br /> 20000 100000 rli h � <br /> F.. <br /> so 00 ..... r <br /> 40000 .c�....:.. 4 .. <br /> r. 20000 ._:.......... _ .:........__y�...,�� ..__._�__ .'I�' <br /> '� .�..:.METHYLTERT-BUTYL ETHER(MTBE) --- Tmnd <br /> k METHYL-TERT-BUTYL ETHER(MTBE) Results for MW4 <br /> 9000 <br /> } <br /> 8000 <br /> 7000 _.. t ._.:.:_ .. .,-- ­..­ <br /> ;? 5000 <br /> 4000 <br /> 3000 <br /> 2000 is M..:..• _ {{ <br /> 1000 ... - ._._:u. J <br /> .v.sas METHYL--TERM-BUTYL ETHER(MTBE) . Trend <br /> Sensitive Receptor Survey <br /> A Sensitive Receptor Survey (SRS)was conducted in 2000 by AGE and included a records <br /> search at the CDPH and an on-the-ground.survey. The survey identified 35 water supply wells <br /> within a 2,000 foot radius of.the Site. The nearest well is 175 feet north of the Site has'a <br /> screened interval of 167-247 feet bgs and groundwater samples have not contained fuel <br /> hydrocarbons above method detection limits. <br />