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ETTLER <br /> YAN INC. <br /> December 28, 2001 <br /> G-R Job#180175 <br /> Mr. Edward C. Ralston <br /> Phillips 66 Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE: Fourth Quarter Event of November 21,2001 <br /> 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 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 /> Q�pF1=5S�0� <br /> Deanna L. Harding O P <br /> Project Coordinator <br /> z <br /> LU NO. C 55734 m <br /> * EXP' <br /> H"Kev �, �Q <br /> P.E. No. C55734 �9 civi - <br /> TF OF C ALVV <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 /> Attachments: Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 11195.yml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />