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Fayette Manufacturing Cor - 3 - � � October 25, 2011 <br /> 3 <br /> 1 • In-Situ Soil/ Groundwater Remediation: Dual phase extraction pilot test, conducted in'- <br /> August 2010, removed 4548 gallons of contaminated groundwater: Ozone sparging pilot <br /> test, conducted August 2010 <br />[ General SiteConditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and,intermiixed.sand, <br /> silt and clay. The depth to groundwater is approximately 6 feet b and the groundwater <br /> gradient is�northerly.at approximately 0.002 feet/foot x <br /> • Estimate of Hydrocarbon Mass in Soil: Prior to remediation, ATC Associates estimated <br /> that.approximately 54 pounds of TPHg was calculated to remain in site soils <br /> Groundwater Trends: 'There are more than-16 years of groundwater monitoring-data for <br /> this Site. Benzene trends are shown below, source area''(MW=2) and`dowrrgradient <br /> (MW-3) <br /> BENZENE Results for MW2 <br /> t <br /> • 2000 <br /> I� 1800 <br /> 1600 <br /> I' <br /> ' 1400�_.___ _.__ „_. - _ _-__. _' _..:. • <br /> .' 12001.:... <br /> I <br /> _. 1000 <br /> 800 I5 <br /> 600 j 1 - - <br /> o <br /> T <br /> l 9ENZENE T e d <br /> BENZENE Results`for MW3` <br /> 350 1 <br /> 200 <br /> 1 f: <br /> iob <br /> 1 I <br /> n <br /> (. BENZENE <br /> i <br /> Sensitive Receptor Survey <br /> A Sensitive Receptor Survey (SRS) was conducted in September 2009 by ATC Associates. A <br /> records search at the Department of Water Resources and an on-the-ground survey in the area <br /> was conducted. <br /> Recommendation <br /> May 2008, the Fund recommends that the San Joaquin County LOP direct the Responsible <br /> Party to assess remedial technologies and implement active remediation to achieve Water <br /> Quality Objectives in a timely manner. In addition, the Fund recommends that the Responsible <br /> Party conduct regular monitoring and upload all data to Geotracker. The Fund will review this <br /> site next year to track progress. <br /> UPDATED, May 2009, this investigation has been underway for 21 years. The San Joaquin <br /> County LOP directed the Responsible Party to conduct dual phase extraction and air/oxygen <br /> sparging. The Fund concurs and will review this site next year to track progress. <br /> I <br />'I <br /> i <br /> i <br />