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M P D 5 <br /> t � R <br /> SERVICES, INCORPORATED <br /> � f= rsv3j n11 1 <br /> MPDS-UN5098-02 <br /> May 3 , 1994 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O Box 5155 <br /> San Ramon, California 94583 <br /> Attention Ms Tana R Berry <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 <br /> site by MPDS Services, Inc <br /> RECENT FIELD ACTIVITIES <br /> 1 <br /> The Unocal monitoring wells that were monitored and sampled during <br /> this quarter are indicated in Table 1 Prior to sampling, the <br /> Unocal wells were checked for depth to water and the presence of <br /> free product or sheen The monitoring data and the ground water <br /> elevations for the Unocal wells are summarized an Table 1 The <br /> ground water flow direction at the Unocal site during the most <br /> recent quarter as shown on the attached Figure 1 <br /> A 3oant monitoring event was conducted with the consultant for the <br /> nearby Montgomery Ward site on March 29, 1994 The monitoring data <br /> collected for the Montgomery Ward' s monitoring wells (provided by <br /> Environmental Audit, Inc ) are summarized in Table 4 The ground <br /> water flow direction at the Montgomery Ward site during the most <br /> recent quarter is also shown on the attached Figure 1 <br /> Ground water samples were collected from the Unocal wells on March <br /> 29, 1994 Prior to sampling, the Unocal wells were each purged of <br /> between 12 5 and 16 gallons of water During purging operations, <br /> the field parameters pH, temperature, and electrical conductivity <br /> were recorded and are presented in Table 2 . Once the field <br /> parameters were observed to stabilize, and where possible, a <br /> minimum of approximately four casing volumes had been removed from <br /> each well, samples were then collected using a clean Teflon bailer. <br /> The samples were decanted into clean VOA vials and/or one-liter <br /> amber bottles, as appropriate, which were then sealed with Teflon-- <br /> lined screw caps, labeled, and stored in a cooler, on ice, until <br /> delivery to a state-certified laboratory MPDS Services, Inc . <br /> 2401 Stanwell Drive,Suite 400 <br /> Concord, Califomia 94520 <br /> Tel (510)602-5120 Fax (510)689-1918 <br />