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6ETTLER - RYAN INC. <br /> February 16, 2001 <br /> z <br /> G-R Job#180138 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road,Suite 120 <br /> Roseville,California 95661 <br /> RE Fourth Quarter Event of December 26 and 27, 2000 <br /> Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station#6481 <br /> 4707 Pacific Avenue <br /> Stockton,California <br /> Dear Mr Ralston <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) at the referenced site All field work was conducted in accordance with G-R Standard Operating <br /> Procedure- 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 Static water level data and <br /> 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 <br /> Procedure - Groundwater Sampling (attached) The field data sheets are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1, 2 and 3 A Concentration Map <br /> is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> C <br /> , <br /> �S RED G <br /> Deanna L Harding �5� ���D� <br /> Project Coordinator ,Q��/d►� <br /> No.5577 <br /> Stephen Carter U, <br /> Senior Geologist,R G No 5577 <br /> Figure 1 Potentiometric Map �OF CAL.�FO� <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 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 6981 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 (925) 551 - 7555 <br />