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GETTLER - RYAN INC. <br /> iDecember 20, 1999 <br /> G-R Job#18013 7 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Fourth Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station#5886 <br /> 2701 West March Lane <br /> Stockton, Cahforma <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler- <br /> Ryan, Inc (G-R) On November 29, and 30, 1999, field personnel monitored and sampled twenty wells <br /> (MW-1,MW-2,MW-3,MW4D,MW4S,MW-5D,MW-5S,MW-6D,MW-6S,MW-7D,MW-7S,MW- <br /> 8 S,MW-8I,MW-8D,MW-9S,MW-9I,MW-9D,MW-10S,MW-10I,and MW 1 OD)at the 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 Potentiometnc Map is included as Figure 1 <br /> Groundwater samples were collected from the momtonng wells as specified by 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 and 2, and a Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also <br /> attached <br /> cerely, <br /> C�,JII�JI(`Gl Ott"`' Q5 � d�E010 <br /> DI:ea a L Harding �'cf'>, <br /> Project Coordinator CO F9 <br /> No.5577 <br /> Stephen J Carte (Pj, `�- <br /> Senior Geologist, R G No 5577 9OF <br /> CAL1�OP� <br /> Figure 1 Potentiometnc Map <br /> I <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 /> 5886 qml Cham of Custody Document and.Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925) 551 - 7555 <br />