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KAPREALIAN ENGINEERING <br /> I N C O t3 P O R A T E D <br /> ' 0"T 2') P'1 2: Off <br /> KEI-P88--1013 . QR5 <br /> August 9 , 1993 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Ms. Tina Berry <br /> RE: Quarterly Report <br /> Former Unocal Service Station #5098 <br /> 5606 Pacific Avenue <br /> Stockton, California <br /> Dear Ms. Berry: <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) . The wells are <br /> currently monitored monthly and sampled on a quarterly basis . This <br /> report covers the work performed by KEI from April through June of <br />. 1993 . <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 in KEI ' s report (KEI- <br /> P88-1013 .R2) dated July 15, 1992 . <br /> RECENT FIELD ACTIVITIES <br /> The five existing Unocal monitoring wells (MW6 and MW10 through <br /> MW13) were monitored three times and were sampled once by KEI <br /> during the quarter, except for well MW6, which was not sampled <br /> because the well was dry. During monitoring, the wells were <br /> checked for depth to water and the presence of free product. Prior <br /> to sampling, the wells were also checked for the presence of a <br /> sheen. No free product or sheen was noted in any of the Unocal <br /> wells during the quarter. The monitoring data collected by KEI <br /> this quarter for the Unocal wells are summarized in Table 1 . <br /> 2401 Stanwell Drive Suite 400 <br /> Concord California 94520 <br /> Tel 510 602 5100 Fax 510 687 0602 <br />