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i <br /> 6ETTLER - RYAN INC. <br /> January 11, 1999 <br /> Mr. Jim Adams G-R Job #180144 <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 /> 5203 East 11th 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 December 1, 1998, field personnel monitored ten wells (U-1 through U-10) and sampled seven <br /> wells (U-1, U-2, U-3, and U-5 through U-8) 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 Potentiornetric 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 /> incerely, <br /> lain <br /> 'D GE0,1 <br /> canna L. HardingN J. <br /> Project Coordinator ��,,`�,E �'c• `P� <br /> Stephen J. Carter <br /> No.5577 <br /> Senior Geologist, R.G. No. 5577 d'�92.1 <br /> Figure 1: Potentiometric Map OF CALF <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 /> �988.gm1 Chain of Custody Document and Laboratory Analytical Reports <br /> • <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 (925) 551 -7555 <br />