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KAPREALIAN ENGINEERING tint I N C 0 R P 0 R A T E D tt KEI-P88--1013 . QR6 November 10, 1993 Unocal Corporation 2000 Crow Canyon Place, Suite 400 P.O. Box 5155 San Ramon, California 94583 Attention: Ms. Tina Berry RE: Quarterly Report Former Unocal Service Station #5098 5606 Pacific Avenue r7 Stockton California Dear Ms. Berry: This report presents the results of the most recent quarter of monitoring and sampling of the monitoring wells at the referenced site by Kaprealian Engineering, Inc. (KEI) . The wells are currently monitored and sampled on a quarterly basis. This report covers the work performed by KEI from July through September of 1993 . BACKGROUND The subaect site formerly contained a Unocal service station facility and presently contains an office building. Extensive excavation of contaminated soil was performed at the site in 1988 . Five monitoring wells (four on-site, and one off-site) currently exist at and in the vicinity of the site. A site description, detailed background information including a summary of all of the soil and ground water subsurface investiga- tion/remediation work conducted to date, site hydrogeologic conditions, and tables that summarize all of the soil and ground water sample analytical results are presented in KEI ' s report (KEI- P88-1013 .R2) dated July 15 , 1992 . RECENT FIELD ACTIVITIES Four of the five existing Unocal, monitoring wells (MW10 through MW13) were monitored three times and were sampled once by KEI during the quarter. Monitoring well MW6 was not monitored or sampled this quarter since the well has been dry. During monitor- ing, the wells were checked for depth to water and the presence of free product. Prior to sampling, the wells were also checked for the presence of a sheen. No free product or sheen was noted in any of the Unocal wells during the quarter. The monitoring data 2401 Stanwell Dave,5uitc,,#O Concord California 94520 Tel 510 002 1100 Fax 510 687 0602