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t MPD S SERVICES, INCORPORATED MPDS-UN6348-01 January 24 , 1994 Unocal Corporation 2000 Crow Canyon Place, Suite 400 P O Box 5155 San Ramon, California 94583 Attention Mr Edward C Ralston RE Quarterly Data Report Former Unocal Service Station #6348 3788 Tracy Boulevard Tracy 1California Dear Mr Ralston This 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 The wells are currently monitored and sampled on a quarterly basis This report covers the work performed by MPDS Services, Inc in December of 1993 RECENT FIELD ACTIVITIES The four monitoring wells (MW-1 , MW-2 , MW-3A, and MW-4) were monitored and sampled once during the quarter, except for well MW-1, which was not sampled because the casing seemed damaged Prior to sampling, the wells were checked for depth to water and the presence of free product or sheen The monitoring data collected this quarter are summarized in Table 1 Ground water samples were collected from monitoring wells MW-2, MW-3A, and MW-4 on December 8 , 1993 Prior to sampling, the wells were each purged of between 6 5 and 7 gallons of water 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 a minimum of approximately four casing volumes had been removed from each well, samples were then collected using a clean Teflon bailer. The samples were decanted into clean VOA vials that were then sealed with Teflon-lined screw caps, labeled, and stored in a cooler, on ice, until delivery to a state-certified laboratory 2401 Stanwell Drive,Suite 400 Concord, California 94520 Tel (510) 602-5120 Fax (510)689-1918