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PD S <br /> SERVICES, INCORPORATED <br /> rriIL P11 2 0 <br /> MPDS-UN5098-01 <br /> January 26, 1994 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Ms. Tina 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 /> The monitoring wells that were monitored and sampled during this <br /> quarter are indicated on Table 1. Prior to sampling, the 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 are <br /> summarized in Table 1 . The ground water flow direction during the <br /> most recent quarter is shown on the attached Figure 1. <br /> An attempt was made to conduct point monitoring with the ad3acent <br /> Montgomery Ward site on December 20, 1993 ; however, the Montgomery <br /> Ward's wells were monitored on December 21, 1993 . <br /> Ground water samples were collected on December 20, 1993 . Prior to <br /> sampling, the wells were each purged of between 11. 5 and 14 gallons <br /> of water. During purging operations, the field parameters pH, <br /> temperature, and electrical conductivity were recorded and are <br /> presented in Table 2 . Once the field parameters were observed to <br /> 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 <br /> nto clean 17r)21 ;.±µ1s and/^r one-1 t <br /> l z er amber bottles, as appropri- <br /> ate, which were then sealed with Teflon-lined screw caps, labeled, <br /> and stored in a cooler, on ice, until delivery to a state-certified <br /> laboratory. <br /> 2401 Stanwell Drive,Suite 400 <br /> Concord, California 94520 <br /> Tel (510)602-5120 Fax (510) 689-1918 <br />