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6ETTLER - RYANINC. <br /> June 30, 1999 <br /> G-R .lob #180144 <br /> Mr. Dan Truzzolino <br /> Tosco Distribution Company <br /> 9645 Santa Fe Springs Road <br /> Santa Fe Springs, California 90670 <br /> RE: Semi-Annual 1999 Groundwater Monitoring & Sampling Report <br /> Tosco (Former Unocal) Bulk Plant #0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Mr. Truzzolino: <br /> This report documents the semi-annual groundwater monitoring and sampling event performed by Gettler- <br /> Ryan Inc. (G-R). On May 24, 1999, field personnel monitored and sampled ten wells (U-1 through U-10) <br /> at the above referenced site. <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons. Separate-phase hydrocarbons were not present in the wells. Static water level data and <br /> groundwater elevations are summarized in Table 1. A Potentiometric Map is included as Figure 1. <br /> Groundwater samples were collected from the monitoring wells as specified-by G-R Standard Operating <br /> Procedure - Groundwater Sampling (attached). The field data sheets are also attached. The samples were <br /> analyzed by Sequoia Analytical. Analytical results are summarized in Table 1, and a Concentration Map is <br /> included as Figure 2. The chain of custody document and laboratory analytical reports are also attached. <br /> Den9aaL. <br /> rely, <br /> aED <br /> Harding ��, oJ��S <br /> P oject Coordinator �' l <br /> No.6882 <br /> Dou as\* <br /> Lee <br /> Senior Geologist, R.G. No. 6882 <br /> F <br /> Figure 1: Potentiometric Map <br /> Figure 2: Concentration Map <br /> Table l: Groundwater Monitoring Data and Analytical Results <br /> Attachments: Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 40 Chain of Custody Document and Laboratory Analytical Reports <br /> 0788.qmi <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />