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6ETTLER - RYAN IV <br /> C. <br /> June 20, 2000 <br /> G-R.Job#180137 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Second Quarter 2000 Groundwater Monitoring&Sampling Report <br /> Tosco (Unocal) Service Station#5886 <br /> 2701 West March Lane <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 May 10 and 11, 2000, field personnel monitored and sampled twenty wells(MW-1,MW-2, <br /> MW-3, MW-4D,MW-4S,MW-5D,MW-5S, MW-6D,MW-6S,MW-7D,MW-7S,MW-8S,MW-8I,MW-8D, <br /> MW-9S, MW-91, MW-9D, MW-IOS,MW-10I, and MW-IOD) at the above referenced site <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 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, and a Concentration Map is included <br /> as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> ncerely, <br /> y <br /> Deanna L Harding REO GE%O& <br /> Pro ect Coordinator ��Uo��G1.AS d ���� <br /> No M <br /> Doug s Aee <br /> Senior Geologist, R G No 6882 ���T <br /> F ALF � <br /> Figure 1 Potentiometnc Map OF C <br /> Figure 2 Concentration Map <br /> Table I Groundwater Mom ton ng Data and Analytical Results <br /> Table 2 Groundwater Analytical Results -Oxygenate Compounds <br /> Attachments Standard Operating Procedure -Groundwater Sampling <br /> Field Data Sheets <br /> 5886 qmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925) 551 -7555 <br />