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U 0 0 0 <br /> � Z <br /> 000 <br /> � n d N. D <br /> - ¢ a g <br /> " �' ¢ SERVICES, INCORPORATED <br /> MPDS-UN5098-07 <br /> July 19, 1995 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P 4 Box 5155 <br /> San Ramon, California 94583 <br /> Attention Ms Tina R Berry <br /> q <br /> RE: Quarterly Data Report <br /> Former Unocal Service Station #5098 <br /> 5606 Pacific Avenue <br /> Stockton, California <br /> Dear Ms Berry <br /> This data report presents the results of the most recent quarter of <br /> monitoring and sampling of the monitoring wells at the referenced site <br /> by MPDS Services, Inc . <br /> . RECENT FIELD ACTIVITIES <br /> The Unocal monitoring wells that were monitored and sampled during this <br /> quarter are indicated in Table 1 Prior to sampling, the Unocal wells <br /> were checked for depth to water and the presence of free product or <br /> sheen The monitoring data and the ground water elevations for the <br /> Unocal wells are summarized in Table 1 The ground water flow <br /> direction at the Unocal site during the most recent quarter is shown on <br /> the attached Figure 1 <br /> A 3oint monitoring event was conducted with the consultant for the <br /> nearby Montgomery Ward site on June 21, 1995 The monitoring data <br /> collected for Montgomery Ward' s monitoring wells (provided by Environ- <br /> mental Audit, Inc ) are summarized in Table 4 . The ground water flow <br /> direction at the Montgomery Ward site during the most recent quarter is <br /> also shown on the attached Figure 1 <br /> Ground water samples were collected from the Unocal wells on June 21, <br /> 1995 Prior to sampling, the Unocal wells were each purged of between <br /> 12 5 and 16 gallons of water. During purging operations, the field <br /> parameters pH, temperature, and electrical conductivity were recorded <br /> and are presented in Table 2 . Once the field parameters were observed <br /> to stabilize, and where possible, a minimum of approximately four <br /> casing volumes had been removed from each well, samples were then <br /> collected using a clean Teflon bailer The samples were decanted into <br /> clean VOA vials and/or one-liter amber bottles, as appropriate, which <br /> were then sealed with Teflon-lined screw caps, labeled, and stored in <br /> a cooler, on ice, until delivery to a state--certified laboratory. MPDS <br /> 2401 Stanwell Drive Suite 300 Concord CA 94520 <br /> TEL (510)602-5120 FAX (510)689-1918 <br />