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ti <br /> ETTLER - YAN INC. <br /> September 10, 2001 <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: Third Quarter Event of August 10,2001 <br /> Groundwater Monitoring & Sampling Report <br /> Tosco(Former BP Oil) Service Station#11195 <br /> 16500 South 1-5 <br /> Lathrop, California <br /> Dear Mr. Ralston: <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc. <br /> (G-R) at the referenced site. All field work was conducted in accordance with G-R Standard Operating Procedure <br /> - Groundwater Sampling (attached). <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons. <br /> Separate-phase hydrocarbons were not present in the wells. A Potentiometric Map is included as Figure 1. Dissolved <br /> Oxygen Concentrations are presented in Table 3. Static water level data and groundwater elevations are summarized <br /> in Table 1. <br /> Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating Procedure <br /> -Groundwater Sampling(attached). The field data sheets are also attached. The samples were analyzed by Sequoia <br /> Analytical. Analytical results are summarized in Tables 1 and 2. A Concentration Map in included as Figure 2. The <br /> chain of custody document and laboratory analytical reports are also attached. <br /> Sincerely, <br /> Deanna L. Harding <br /> Project Coordinator S�ERE� C�O� <br /> No. 6882 <br /> Doug] s J. ee �r <br /> Senior Geologist,R.G. 6882 <br /> Figure 1: Potentiometric Map 9TFG� C' �E <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 /> Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 { 925 ) 551 - 7555 <br />