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ESA Environmental <br /> Science <br /> Associates n EDO <br /> DED � 1 2000 1 <br /> November 28, 2000 <br /> pER <br /> i <br /> Ms. Carol Oz <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Street <br /> Stockton, California 95202 <br /> Subject: Additional Groundwater Assessment for MTBE <br /> Former Underground Storage Tank Site <br /> University of the Pacific (UOP)Physical Plant <br /> 1081 W.Mendocino Avenue, Stockton, California <br /> i <br /> Dear Ms. Oz: <br /> ESA has prepared the attached Workplan for Additional Groundwater Assessment for further evaluation of <br /> methyl tertiary-butyl ether(MTBE)in the groundwater at the above referenced site. MTBE was detected in <br /> the soils beneath the former UST tank pit following the removal of a 4,400-gasoline tank in April,2000. <br /> Concentrations of petroleum hydrocarbons (gasoline) were either non-detect or at low concentrations. In our <br /> follow-up investigation in July 2000, MTBE was detected in 2 of 5 groundwater samples at a maximurh <br /> concentration of 1,300 parts per billion. The work discussed in this workplan is intended to further evaluate <br /> the extent of the MTBE concentration in the shallow groundwater. <br /> We appreciate your assistance in preparing and reviewing this workplan and look forward to working with <br /> you again. If you require additional information or have questions,please call Peter Hudson at(415) <br /> 896.5900 or Ms. Crystal Stech at(916)564.4500. <br /> Sincerely, <br /> i <br /> o n E. Forsyt e, CP <br /> Project Manager <br /> i <br /> cc: Joe Kirim,Director,Physical.Plant,University of the Pacific <br /> Peter Hudson,R.G.,ESA San Francisco <br /> • i <br /> 700 University Avenue,Suite 130 Sacramento,California 95825 (916)564-4500 fax 564-4501 email:esa.sac@esassoc.com <br /> • i <br />