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J ... <br /> j �, <br /> MPD 5 <br /> I r' + F k — a SERVICES, INCORPORATED <br /> i R; 9; 26 <br /> MPDS-UN0788-02 <br /> March 29, 1994 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Ms . Penny L. Silzer <br /> RE : Quarterly Data Report <br /> Unocal Bulk Plant #0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Ms . Silzer: ' <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 /> F,>f RECENT FIELD ACTIVITIES <br /> The monitoring wells that were monitored and sampled during this <br /> quarter are indicated in 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 /> Ground water samples were collected on February 18 , 1994 . A field <br /> blank labeled U-11 was also collected on February 18, 1994 . Prior <br /> to sampling, the wells were each purged of between 10 and. 26 <br /> gallons of water. During purging operations, the field parameters <br /> pH, 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 /> into clean VOA vials and/or one-liter amber bottles, as appropri- <br /> ate, which were then sealed with Teflon-lined screw caps, labeled, <br /> and stored in a cooler, on ices until delivery to a state-certified <br /> laboratory. <br /> u ANALYTICAL RESULTS <br /> The ground water samples were analyzed at Sequoia Analytical <br /> ' J Laboratory and were accompanied by properly executed Chain of <br /> Custody documentation. The analytical results of the ground water <br /> 2.401 Stanwell Drive,Suite 400 `~ <br /> Concord,California 945.20 <br /> Tel:(510)602-5120 Fax:(510)689-1918 <br /> t <br />