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� INC.,*V <br />ETTLER -RYA <br />August 17, 2000 <br />G -R Job #386408 <br />Mr Robert Cochran <br />Chevron Products Company <br />P O Box 6004 <br />San Ramon, CA 94583 <br />RE Third Quarter Event of July 24, 2000 <br />Groundwater Monitoring & Sampling Report <br />Former Chevron Service Station #9-5775 <br />301 West Kettleman Lane <br />Lodi, California <br />Dear Mr Cochran <br />This report documents the most recent groundwater monitoring and sampling event performed by Gettler- <br />Ryan Inc (G -R) at the referenced site All field work was conducted in accordance with G -R Standard <br />Operating Procedure - Groundwater Sampling (attached) <br />Static groundwater levels were measured and the wells were checked for the presence of separate -phase <br />hydrocarbons Static water level data, groundwater elevations, and separate -phase hydrocarbon thickness (if <br />any) are presented in the attached Table 1 Potentiometric Maps are included as Figures 1 and 2 <br />iGroundwater samples were collected from the monitoring wells and submitted to a state certified laboratory <br />for analyses The field data sheets for this event are attached Analytical results are presented in the table(s) <br />listed below Concentration Maps are included as Figures 4 and 6 Isoconcentration Maps are included as <br />Figure 3, 5, 7, and 8 The chain of custody document and laboratory analytical report are also attached <br />Please call if you have any questions or comments regarding this report Thank you <br />Sincerely, <br />anna L Harding <br />Project Coordinator <br />tephen Carter <br />Senior Geologist, R G No 5577 <br />No. 5577 1 * <br />Figure I <br />Potentiometnc Map — Shallow Wells <br />Figure 2 <br />Potentiometric Map -- Deep Wells <br />Figure 3 <br />Isoconcentration Map — Shallow Wells — TPH as Gasoline <br />Figure 4 <br />Concentration Map — Deep Wells — TPH as Gasoline <br />Figure 5 <br />Isoconcentration Map — Shallow Wells — Benzene <br />Figure 6 <br />Concentration Map — Deep Wells — Benzene <br />Figure 7 <br />Isoconcentration Map — Shallow Wells — MTBE <br />Figure 8 <br />lsoconcentration Map — Deep Wells — MTBE <br />Table 1 <br />Groundwater Monitoring Data and Analytical Results <br />Table 2 <br />. <br />Groundwater Analytical Results - Oxygenate Compounds <br />Attachments <br />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, Cal ttornia 94568 • (925) 551-7555 <br />