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1 <br /> 6ETTLER - RYAN INC. <br /> December 29, 2000 <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 Third Quarter 2000 Groundwater Monitoring& Sampling Report <br /> Tosco (Unocal) Service Station #6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On September 22 and 23, 2000, field personnel monitored and sampled eighteen wells (MW-1, <br /> MW-2,MW-4 through MW-9,MW-11, MW-14,MW-15,MW-16,VW-1 through VW-4, VW-7,and PTW-1) <br /> at the above referenced site One well (VW-2) was dry <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 summanzed 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 /> Sincerely, <br /> 6 a�' , % <br /> Deanna L Harding MO. GEO <br /> Pro ect Coordinator ���OpVG1.AS .I ���� <br /> �oR bio. 6882 <br /> Steph n Carter � � <br /> Senior Geologist, R G No 5577 <br /> Figure 1 Potentiometnc Map TF OF CAI.� �� <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 /> 6"i qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J 9 Dublin , California 94568 (925) 551 -7555 <br />