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Sig 6ETTLER - RYAN NC® <br /> July 17, 1998 <br /> G-R.Job #180144 <br /> Mr. Jim Adams <br /> Tosco Distribution Company <br /> 9645 Santa Fe Springs Road <br /> Santa Fe Springs, California 90670 <br /> RE: Semi-Annual 1998 Groundwater Monitoring &Sampling Report <br /> Tosco (Former Unocal) Bulk Plant#0788 <br /> 8203 East 11 th Street <br /> Tracy, California <br /> Dear Mr. Adams: <br /> This report documents the semi-annual groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc. (G-R). On April 29, 1998, field personnel monitored and sampled ten wells (U-1 through U-10) at the <br /> 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 j <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 /> Sincerely, A ;D GF0 <br /> 40G <br /> Deanna L. Hardi <br /> Project C dinator * No.6726 <br /> � E$ 31 <br /> Ri . Fears Tf OF CA1�E� <br /> Registered Geologist, R.G. No. 6728 <br /> I <br /> Figure 1: Potentiometric Map <br /> Figure 2: Concentration Map <br /> Table 1: Groundwater Monitoring Data and Analytical Results <br /> Attachments: Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> • 07e8.gmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />