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� '10313 <br /> o <� Z <br /> v <br /> � Z ? z <br /> z ¢ a �DI I0 <br /> 03 ` SERVICES, INCORPORATED <br /> a <br /> Q A Ci O <br /> MPDS-UN0187-07 <br /> February 27, 1996 <br /> Unocal Corporation <br /> 2000 Crow Canyon. Place, Suite 400 <br /> P O Box 5155 <br /> San Ramon, California 94583 <br /> Attention Mr Robert A. Boust <br /> RE - Quarterly Data Report <br /> Former Unocal Service Station ##0187 <br /> 437 East Miner 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 on 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 6 , 1996 Prior to <br /> sampling, the wells were each purged of between 8 and 12 5 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 ESI , 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 /> 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 /> 2401 Stanwell Drive Suite 300 Concord CA 94520 <br /> TEL (510)602 5120 FAX (510)689-1918 <br />