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r <br /> f.• \ 1� <br /> ICAiPR0EA011R PENGINEERING <br /> O RI A T EN p i ib�iC ��, HFALTH <br /> 1 40 Pkf"J Sf RVICE <br /> R1 2: 26 <br /> KEI-P92-0205.QR1 <br /> April 2, 1993 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. Robert A. Boust <br /> i <br /> RE: Quarterly Report <br /> Former Unocal Bulk Plant #0950 <br /> 2835 Navy Drive <br /> Stockton, California <br /> Dear Mr. Boust: <br /> This report presents the results of the most recent quarter of <br /> monitoring and sampling of the monitoring wells at the referenced <br /> site by Kaprealian Engineering, Inc. (KEI) , per KEI ' s proposal <br /> (KEI-P92-0205 .P3) dated October 6, 1992 . The wells are currently <br /> monitored monthly and sampled on a quarterly basis. This report <br /> . covers the work performed by KEI from December of 1992 through <br /> February of 1993 . <br /> BACKGROUND <br /> The subject site was formerly used as a bulk petroleum product <br /> storage and distribution facility. It is KEI 's understanding that <br /> in 1988 Kleinfelder installed seven monitoring wells and drilled <br /> two exploratory borings during a soil and ground water assessment <br /> at the referenced site. Documentation of the sample collection <br /> techniques and analytical results are presented in Kleinfelder ' s <br /> problem assessment report (Kleinfelder Job No. 24-2059-01) dated <br /> September 1, 1988 . Two underground diesel storage tanks (with <br /> individual capacities of 20, 000 and 10, 000 gallons) were removed <br /> from the site on April 22 , 1992 . Soil contamination detected <br /> beneath the fuel tanks was overexcavated to a depth of 0. 5 foot <br /> below ground water (11 feet below grade) . <br /> A summary of all of the soil and ground water subsurface investiga- <br /> tion/remediation work conducted to date by KEI , and tables that <br /> summarize all of the soil and ground water sample analytical <br /> results are presented in KEI 's reports (KEI-J92-0205 .R1) dated <br /> October 6 , 1992 , and (KEI-P92-0205 .R2) dated December 1 , 1992 . <br /> RECENT FIELD ACTIVITIES <br /> • The seven monitoring wells (MW1 through MW7) were monitored three <br /> times and were sampled once during the quarter, except for wells <br /> 2401 Stanwell Drive Suite 400 <br /> Concord Celifornta 94520 <br /> Ti 1510 602 5100 Fax 510 687 0602 <br />