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0 o V UmDOSERVICES, <br /> ' <br />' a z w � <br /> ° doa Z ¢ 0. <br /> `-' ` INCORPORATED <br /> a a p <br /> A ■ 1! R �� <br /> MPDS-UN0123-01 <br />' June 22 , 1995 <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 /> Former Unocal Service Station #0123 <br /> 1034 Central Avenue <br />' Tracy, California <br /> Dear Mr. Ralston: <br />' This data report presents the results of f first quarter of monitoring <br /> and sampling of the monitoring wells at the referenced site by MPDS <br /> 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 June �2 , 1995 Prior to <br /> sampling, the wells were each purged of betwe n gallons of <br /> water During purging operations, the field parameters pH, tempera- <br /> ture, and electrical conductivity were recorded and are presented an <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 />' - 2401 Stanwell Drive Suite 300,Concord CA 94520 <br /> TEL (510)602-5120 FAX (510)689-1918 <br />