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I C. <br /> ETTLER YANN <br /> July 10, 2000 <br /> G-R Job#180175 <br /> Mr. Edward C. Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE: Second Quarter 2000 Groundwater Monitoring&Sampling Report <br /> Tosco (Former BP Oil) Service Station#11195 <br /> 16500 South I-5 <br /> Lathrop, California <br /> Dear Mr. Ralston: <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc. (G-R). On May 5,2000,field personnel monitored and sampled eleven wells (MW-1 through MW-6 and <br /> MW-8 through MW-12) 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. A Potentiometric Map in included <br /> as Figure 1. Dissolved oxygen concentrations are presented in Table 3. Static water level data and groundwater <br /> -� elevations are summarized in Table 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 Tables 1 and 2. A Concentration Map <br /> in included as Figure 2. The chain of custody document and laboratory analytical reports are also attached. <br /> S' cerely, <br /> RSD GEO <br /> Deanna L. Harding 'A 1,P+S J, <br /> roject Coordinator ��C�OpJG <br /> No. 6882 <br /> Doug s <br /> Senior Geologist, R.G. 6882 q <br /> OF CAI.�F <br /> Figure 1: Potentiometric Map <br /> Figure 2: Concentration Map <br /> Table 1: Groundwater Monitoring Data and Analytical Results <br /> Table 2: Groundwater Analytical Results-Oxygenate Compounds <br /> Table 3: Dissolved Oxygen Concentrations <br /> t <br /> Attachments: Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 11195.gm1 Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />