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,r <br /> h <br /> t `Y MPDS <br /> SERVICES, INCORPORATED ' `r NF1'"'M'I `+l_ II[ATIi <br /> t <br /> MPDS-UN2859-02 <br /> March 17, 1994 <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 #2859 <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 <br /> site 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 <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 direction during the <br /> most recent quarter is shown on the attached Figure 1 <br /> Ground water samples were collected on- February 18, 1994 . Prior to <br /> sampling, the wells were each purg-ed' of between 2 . 5 and 10 gallons <br /> of water During purging operations, the field parameters pH, <br /> temperature, and electrical conductivity were recorded and are <br /> presented in Table 2 Once the field parameters were ol5served to <br /> stabilize, and where possible, a minimum of approximately four <br /> casing volumes had been removed from each well, sampled were then <br /> collected using a clean Teflon bailer The samples were decanted <br /> into clean VOA vials and/or one-liter amber bottles, as appropri- <br /> ate, which were then sealed with Teflon-lined screw caps; labeled, <br /> and stored in a cooler, on ice, until delivery to a state-certified <br /> laboratory. <br /> 2401 Stanwell Drive,Suite 400 <br /> Concord,California 94520 <br /> Tel (510)602-5120 Fax (510) 689-1918 <br />