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300000 <br />250000 <br />0 200000 <br />79, 150000 <br />100000 <br />50000 <br />04 <br />METHYL-TERT-BUTYL ETHER (MTBE) q.v... Trend <br />METHYL-TERT-BUTYL ETHER (MTBE) Results for MW7A <br />350000 <br />4c) ) ,ro` / <br />METHYL-TERT-BUTYL ETHER (MTBE) <br />METHYL-TERT-BUTYL ETHER (MTBE) Results for EW1 <br />35000 - <br />30000 <br />25000 <br />20000 <br />§ 15000 <br />10000 - <br />5000 - <br />METHYL-TERT-BUTYL ETHER (MTBE) Results for MW4 <br />160000 <br />140000 <br />120000 <br />100000 <br />21 80000 <br />60000 <br />40000 <br />20000 <br />0 <br />— METHYL-TERT-BUTYL ETHER (MTBE) Trend <br />Waterloo Food and Fuel 4 <br /> <br />August 15, 2011 <br />Groundwater Trends: There are more than 11 years of groundwater monitoring data for <br />this Site. MTBE trends are shown below, source area (MW-7A and EW-1) and down <br />gradient (MW-4) <br />Risk Evaluation <br />No human health risk assessment is noted in Geotracker. There are no water supply wells or <br />surface water receptors present within 1,800 feet of the Site. <br />Recommendation <br />In May 2008, the Fund recommends that the San Joaquin County LOP direct the Responsible <br />Party to assess the effectiveness of the current treatment systems and consider adding <br />additional groundwater treatment technologies to achieve Water Quality Objectives more <br />rapidly. In addition, the Fund recommends the Responsible Party define the extent of