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INC. <br /> GETTLER - RYAN <br /> September 29, 2003 <br /> G-R Job#180175 <br /> Mr. Edward C. Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento,Califomia 95818 <br /> RE: Third Quarter Event of August 28 and 29,2003 j <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 events performed by Gcttler-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 /> s i Oxygen Concentrations are presented in Table 3. Static water level data and groundwater elevations are summarized <br /> ' in Table 1. <br /> i <br /> Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory for E <br /> analyses. The field data sheets for this event are attached. Analytical results are presented in the table(s)listed below. <br /> A Concentration Map in included as Figure 2. The chain of custody document and laboratory analytical report are <br /> also attached. <br /> Sinc ly, <br /> (J�/ �pF <br /> r Q� <br /> eanna L.Harding �� Qp K44�' <br /> Project Coordinator 03 <br /> CM � C � m <br /> tLU x No. 5573 r <br /> * EXp• �� <br /> Hagop Kevork Q. <br /> P.E.No. C55734 �91�, C1VIL OQ�\ <br /> Figure 1: Potentiometric Map C <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 /> 1105.gml Chain of Custody Document and Laboratory Analytical Reports k <br /> L <br /> 6747 Sierra Court, Suite J • Dublin, CA 94568 • (925) 551.7555 • Fax (925) 551-7888 <br /> 3140 Gold Camp Drive, Suite 170 • Rancho Cordova, CA 95670 • (916) 631-1300 • Fax (916) 631-1317 <br /> 1364 N. McDowell Blvd., Suite 62 • Petaluma, CA 94954 • (707) 789-3255 • Fax (707) 789-3218 <br />