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KAPREALIAN ENGINEERING <br /> 1 N C 0 R P 0 R A T E D <br /> KEI--P88-1013 .QR3 <br /> January 29 , 1993 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 F� <br /> San Ramon, California 94583 l <br /> Attention: Mr. Ron Bock FE 0 4,393 <br /> €NVIRONM€NTAL P49ALTH <br /> RE: Quarterly Report PERM IYURVICES <br /> Former Unocal Service Station #5098 <br /> 5606 Pacific Avenue <br /> Stockton, California <br /> Dear Mr. Bock: <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-P88-1013 .P2) dated August 23 , 1991, and as modified in KEI ' s <br /> report (KEI-P88-1013 .R2) dated July 15, 1992 . The wells are <br /> currently monitored monthly and sampled on a quarterly basis. This <br /> . report covers the work performed by KEI from October through <br /> December of 1992 . <br /> BACKGROUND <br /> The subject site formerly contained a Unocal service station <br /> facility and presently contains an office building. Extensive <br /> excavation of contaminated soil was performed at the site in 1988 . <br /> Five monitoring wells (four on-site, and one off-site) currently <br /> exist at and in the vicinity of 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 an KEI ' s report (KEI- <br /> P88-1013 .R2) dated July 15, 1992 . <br /> RECENT FIELD ACTIVITIES <br /> The five wells (MW6 and M:4T10 through MW13) were monitored three <br /> times and were sampled once during the quarter, except for well <br /> MW6, which was not sampled because it was dry. During monitoring, <br /> the wells were checked for depth to water and the presence of free <br /> product. Prior to sampling, the wells were also checked for the <br /> presence of sheen. No free product or sheen was noted in any of <br /> the wells during the quarter. The monitoring data collected this <br /> quarter are summarized 3n Table 1 . <br /> 2401 Stanwell Drive Suite 400 <br /> Concord California 94520 <br /> Tel 510 602 5100 Fax 510 687 0602 <br />