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KAPREALIAN ENGINEERING <br /> I N C 0 R P 0 R A T E D <br /> KEI-P91-0202 .QR2 <br /> August 10, 1992 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 _ <br /> P.O. Box 5155 t„� i ' <br /> San Ramon, California 94583 , Ix3 <br /> Attention: Mr. Rick Sisk AUG 19 1992 <br /> RE: Quarterly Report ENVIRONMOTAL HEATH <br /> Unocal service Station #6015 PERMIT /SERVICE <br /> 601 E. Kettleman Lane <br /> Lodi , California <br /> Dear Mr. Sisk: <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 KEI- <br /> P91-0202 .P3 dated October 16, 1991, and as modified in KEI 's report <br /> f~ KEI-P91-0202 .R6 dated January 23 , 1992 . The wells are currently <br /> monitored monthly and sampled on a quarterly basis. This report <br /> covers the work performed by KEI from May through July of 1992 . <br /> BACKGROUND <br /> The subject site currently contains a service station facility. <br /> Three underground fuel storage tanks, one waste oil tank, and the <br /> product piping were removed from the site in February of 1991, <br /> during tank replacement activities. The fuel tank pit was <br /> subsequently overexcavated in order to remove contaminated soil. <br /> Nine monitoring wells and two exploratory borings have been <br /> installed at the site. <br /> A site description, detailed background information including a <br /> summary of all of the soil and ground water subsurface investiga- <br /> tion/remediation work conducted to date, site hydrogeologic <br /> conditions, and tables that summarize all of the soil and ground <br /> water sample analytical results are presented in KEI ' s quarterly <br /> report (KEI-P91-0202 .QR1) dated May 4., 1992 . <br /> RECENT FIELD ACTIVITIES <br /> The nine wells (MW1 through MW9) were monitored three times and <br /> were sampled once during the quarter.. During monitoring, the wells <br /> were checked for depth to water and the presence of free product. <br /> Prior to sampling, the wells were also checked for the presence of <br /> a sheen. No free product or sheen was noted in any of the wells <br /> 2401 Stan•etl Drive,Suite 400 <br /> Concord,California 94520 <br /> Tel:510602.5100 Fax:510.687.0602 <br />