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z Z Z <br /> ocn z DOSERVICES,Za` INCORPORATED <br /> � a <br />' i <br /> MPDS-UN2859-06 <br /> February 28, 1995 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 RECEIVED <br /> Attention: Mr Robert A. Boust MAR 10 1995 <br /> RE Quarterly Data Report ENVIRONMENTAL HEALTH <br /> Former Unocal Service Station #2859 PERMIT/SERVICES <br /> 1665 Pacific Avenue <br /> Stockton. California <br /> Dear Mr. Boust : <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 7, 1995 . Prior to <br /> sampling, the wells were each purged of between 3 .5 and 11 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 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 /> The 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 /> date are summarized in Table 3 . The concentrations of Total Petroleum <br /> 2401 Stanwell Drsve Suite 300 Concord,CA 94520 <br /> TEL (510)602-5120 FAX (510)689-1918 <br />