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ETTLER - YAN INC. <br /> July 3, 2002 <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: Second Quarter Event of May 23,2002 <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 <br /> hydrocarbons. Separate-phase hydrocarbons were not present in the wells. A Potentiometric Map is included as <br /> 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 and submitted to a state certified laboratory for <br /> analyses. The field data sheets for this event are attached. Analytical results are presented in the table(s) listed <br /> below. A Concentration Map in included as Figure 2. The chain of custody document and laboratory analytical <br /> report are also attached. <br /> Please call if you have any questions or comments regarding this report. Thank you. <br /> Sincerely, <br /> 1 <br /> Deanna L.Harding eROF ESR t'0. <br /> Project Coordinator �4�' P K - J7�1 <br /> COi <br /> z <br /> d No. C 55734 M <br /> Hagop Kevork * Exp. <br /> P.E. No. C55734 d' <br /> VIk- <br /> Figure 1: Potentiometric Map �9�F OF,f 6 <br /> Figure 2: Concentration Map <br /> Table 1: Groundwater Monitoring Data and Analytical Results I <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 /> r <br /> 11195.gm1 Chain of Custody Document and Laboratory Analytical Reports �- <br /> I; <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />