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Y <br /> J �JJ _ <br /> KAPREALIAN ENGINEERI�dG ,fll, :�i !T�L HEALTH <br /> t INCORPORATE D i"}�� t' t w410E <br /> 93 JUL 34 PIH 1: 17 <br /> KEI-P92-0205 .QR2 <br /> July 13 , 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 /> 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 March through May of 1993 . <br /> BACKGROUND <br /> The sub3ect site was formerly used as a bulk petroleum product <br /> storage and distribution facility. It is KEI ' s understanding that <br /> in 1988 Kleanfelder 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 , (KEI-P92-0205 .R2) dated December 1 , 1992 , and <br /> (KEI-P92--0205 .R3) dated May 25, 1993 . <br /> RECENT FIELD ACTIVITIES <br /> I <br /> • The seven monitoring wells (MW1 through MW7) were monitored three <br /> times and were sampled once during the quarter. During monitoring, <br /> 2401 Stanwell DmL Suite 400 <br /> Concord Califorma 94520 <br /> Tel 510 602 5100 Fax 510 M7 01,02 <br />