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:..:5GETTLER - RYANINC. <br /> April 17, 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: First 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 Inc. <br /> (G R). On February 22,2000,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 /> asFigure 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 in <br /> included as Figure 2. The chain of custody document and Iaboratory analytical reports are also attached. <br /> 5S' erely, <br /> i <br /> a ardingD G <br /> *Douegcas <br /> ' Coordinator �`'o�G�.AS OrO�i� <br /> No. 6882 <br /> . Lee �r � <br /> Senior Geologist,RG. 6882 <br /> Figure 1. Potentiometric Map �TF DF CALIF <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 /> 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 9 Dublin , California 94568 (925 ) 551 -7555 <br />