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i <br /> 4 <br /> DOSERVICES, INCORPORATED <br /> • <br /> MPDS-UN0788-08 <br /> March 11, 1996 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. Edward C. Ralston <br /> RE: Quarterly Data Report <br /> Unocal Bulk Plant ##0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Mr. Ralston: <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 monitoring wells that were monitored and sampled during this <br /> quarter are indicated in Table 1 . Prior to sampling, the wells were <br /> checked for depth to water and the presence of free product or sheen. <br /> The monitoring data and the ground water elevations are summarized in <br /> Table 1 . The ground water flow direction during the most recent <br /> quarter is shown on the attached Figure 1 . <br /> Ground water samples were collected on February 13 , 1996 . Prior to <br /> sampling, the wells were each purged of between 4 . 5 and 27 gallons of <br /> water. During purging operations, the field parameters pH, tempera- <br /> ture, and electrical conductivity were recorded and are presented in <br /> Table 2 . Once the field parameters were observed to stabilize, and <br /> where possible, a minimum of approximately four casing volumes had been <br /> removed from each well, samples were then collected using a clean <br /> Teflon bailer. The samples were decanted into clean VOA vials and/or <br /> one-liter amber bottles, as appropriate, which were then sealed with <br /> Teflon--lined screw caps, labeled, and stored in a cooler, on ice, until <br /> delivery to a state-certified laboratory. Field blank, Equipment blank <br /> and Trip blank samples (denoted as ES1, ES2 and ES3 respectively) were <br /> also collected for quality assurance and control . MPDS Services, Inc . <br /> transported the purged ground water to the Unocal Refinery located in <br /> Rodeo, California, for treatment and discharge to San Pablo Bay under <br /> NPDES permit . <br /> ANALYTICAL RESULTS <br /> iThe ground water samples were analyzed at Sequoia Analytical Laboratory <br /> and were accompanied by properly executed Chain of Custody documenta- <br /> tion. The analytical results of the ground water 'samples collected to <br /> 2401 Stanwell Drive,Suite 300,Concord, CA 94520 <br /> TEL:(510)602-5120 FAX:(5 10)689-1918 <br />