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r <br /> � ZZZ <br /> � Z Z Z <br /> PE)OSERVICES, INCORPORATED <br /> mAI � o <br /> MPDS-UN6015-02 <br /> November 10 , 1994 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P O Box 5155 <br /> San Ramon, California 94583 <br /> Attention- Mr David B . DeWitt <br /> RE Semi-Annual Data Report <br /> Former Unocal Service Station #6015 <br /> 601 E Kettleman Lane <br /> Lodi California <br /> Dear Mr DeWitt <br /> This data report presents the results of the most recent monitoring and <br /> 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 semi- <br /> annual period 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 directions during the <br /> most recent semi-annual period are shown on the attached Figures 1, 2 <br /> and 3 <br /> Ground water samples were collected on October 24 and 25, 1994 As <br /> shown in Table 3 , the analytical results of the ground water samples <br /> collected on September 28 and 29, 1994 were inconsistent with the <br /> recent analytical results (non -detectable concentrations of petroleum <br /> hydrocarbons) for these wells Therefore MPDS Services, Inc re- <br /> sampled all monitoring wells on October 24 and 25 , 1994 Prior to <br /> sampling, the wells were each purged of between 2 5 and 6 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 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 /> 2401 Stanwell Drove Suite 400 Concord CA 94520 <br /> TEL (510)602 5120 FAX (510)689 1918 <br />