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I <br /> I4 CONCLUSIONS <br /> The highest concentration of MTBE detected during the fourth quarter 2000 sampling event by EPA <br /> Method 8260B was 87 micrograms per liter(µg/L), which was detected in the sample collected from <br /> well MW 10 The highest concentration of MTBE detected during this first quarter 2001 sampling <br /> event by EPA Method 8260B was 1,200 µg/L (MW1), which represents more than an order of <br /> magnitude increase in MTBE concentrations at the site in a three-month period <br /> To provide a graphical overview of the project, hydrographs were prepared presenting groundwater <br /> elevations relative to well construction details, and concentrations of TPH-g, benzene, and MTBE <br /> over time for each of the wells at the site (Appendix C) Included for reference in each of these <br /> hydrographs is a property transaction date of December 1995, when Exxon sold the property to Nella <br /> Oil Company <br /> I <br /> I <br /> I <br /> 10 <br /> I <br /> I <br /> I <br /> 1 <br /> 1 <br /> I <br /> I <br /> I <br /> 1 F Pi o�ects7i'fI4 Um'i l4P0=01 1, 1 7 <br />