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Environments! <br /> �, <br /> EScience <br /> ' I Associates <br /> JUN 9 zags <br /> EN'�ARONIMENT41-. riEALTH <br /> PER IIT / SERVICES <br /> June 8, 2000 <br /> ' Ms. Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> ' 304 East Weber Street <br /> Stockton, California 95202 <br /> Subject: Soil and Groundwater Assessment for MTBE <br /> Former Underground Storage Tank Site <br /> University of the Pacific (UOP) former Physical Plant <br /> 1081 W. Mendocino Avenue, Stockton, California <br /> Dear Ms. Lagorio: <br /> ' ESA has prepared the attached Site Investigation Workplan for the assessment of methyl tertiary-butyl ether <br /> (MTBE) in the soil and groundwater at the subject site referenced above. MTBE was detected in the soils <br /> 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. <br /> We understand that because MTBE was detected in the soil,the Regional Water Quality Control Board <br /> (RWQCB) will likely require further soil and groundwater assessment. As we discussed in our telephone <br /> conversation on March 15, 2000,the University of the Pacific (UOP)is attempting to complete a <br /> construction project and would like to expedite the necessary assessment and possible remediation of the <br /> MTBE. For this reason, we have prepared this workplan and attached the laboratory reports for the soil <br /> ' samples collected immediately following the removal of the UST. Mr. Vidal Pedraza,the San Joaquin <br /> County inspector at the UST removal, indicated during a previous discussion that his office had not yet <br /> received the laboratory reports.By preparing the workplan and attaching the laboratory reports, we hope to <br /> ' provide you the necessary information so that we can complete the assessment as soon as possible. We <br /> understand that you will assign this case following your review and provide us comments on the workplan. <br /> ' We appreciate your help and look forward to working with your department throughout the course of this <br /> assessment. If you require additional information or have questions,please call me at(415) 896.5900 or <br /> Ms. Crystal Stech at(916)564.4500. <br /> Sincerely, <br /> Peter B. Hudson, R.G. <br /> 1 <br /> cc: Joe Kirim,Director,Physical Plant, University of the Pacific <br /> ' John Forsythe,ESA Sacramento <br /> 1 700 University Avenue,Suite 130 Sacramento,California 95825 (916)564-4500 fax 564-4501 email:esa.sac@esassoc.com <br />