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. ZZE 0� F)EI ' y ` SERVICES, INCORPORATED sac y MPDS-UN5098-06 March 8 , 1995 Unocal Corporations � 2000 Crow Canyon Place, Suite 400 ° ,R � F.O. Box 5155 ED San Ramon, California 94583 APR 10 1995 Attention Ms . Tina R. Berry ENVIRONMENTAL HEALTH PERMIT/SERVICES RE Quarterly Data Report Former Unocal Service Station #50985606 Pacific Avenue O ] WF&6 Stockton California Dear Ms . Berry: This data report presents the results of the most recent quarter of monitoring and sampling of the monitoring wells at the referenced site by MPDS Services, Inc . RECENT FIELD ACTIVITIES The Unocal monitoring wells that were monitored and sampled during this quarter are indicated in Table 1 . Prior to sampling, the Unocal wells were checked for depth to water and the presence of free product or sheen. The monitoring data and the ground water elevations for the Unocal wells are summarized in Table 1 . The ground water flow direction at the Unocal site during the most recent quarter is shown on the attached Figure 1 . A joint monitoring event/was conducted with the consultant for the nearby Montgomery Ward site on February 8, 1995 . The monitoring data collected for Montgomery Ward' s monitoring wells (provided by Environ- mental Audit, Inc ) are summarized in Table 4 . The ground water flow direction at the Montgomery Ward site during the most recent quarter is also shown on the attached Figure 1 Ground water samples were collected from the Unocal wells on February 8 , 1995 Prior to sampling, the Unocal wells were each purged of 15etween3 16 .5 allons of wat During purging operations, the field parameters pH, temperature, and electrical conductivity were recorded and are presented in Table 2 Once the field parameters were observed to stabilize, and where possible, a minimum of approximately 2401 Stanwell Drive Suite 300 Concord CA 94520 TEL (5 10)602 5120 FAX (510)689-1918