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GETTLER — RYAN NC. � a <br /> . December 7, 2000 <br /> G-R Job #18023 8 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road,Suite 120 <br /> Roseville,California 95661 <br /> RE Fourth Quarter 2000 Groundwater Monitoring& Sampling Report <br /> Former Tosco(Unocal) Service Station 44409 <br /> 1502 N El Dorado Street fib AA-"- <br /> Stockton,California Ny C <br /> Dear Mr. Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R) On October 10, 2000, field personnel monitored and sampled four wells(NM-1 through MW4)at the <br /> above referenced site <br /> Static groundwater levels were measured and all wells at the referenced site were checked for the presence of <br /> separate-phase hydrocarbons Separate-phase hydrocarbons were not present in any of the wells. Static water <br /> level data and groundwater elevations are summarized in Table 1. A Potentiometric Map is included as Figure 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 <br /> Sequoia Analytical. Analytical results are summarized in Tables 1 and 2. A Concentration Map is included as <br /> Figure 2. The chain of custody document and laboratory analytical reports are also attached. <br /> Sincerely, r <br /> Deanna L.Harding l + S��R� GE�O <br /> Au <br /> ct CoordinatorNo. 6882 <br /> as * ,r <br /> Senior Geologist, R.G.No.6882 <br /> q � <br /> l�4F CA��� <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 /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> "W.,Ild Cham of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 (925) 551 -7555 <br />