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I c. <br /> GETTLER - RYAN N <br /> April 19, 2001 <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: First Quarter Event of March 7 and 8,2001 <br /> Groundwater Monitoring &Sampling Report <br /> Tosca(Unocal) Service Station #6981 <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 I A Potentiometric Map is included as Figure I <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 /> Sincerely, <br /> r '�FESS O <br /> Deanna L Harding <br /> Project Coordinator 114; <br /> UJ No C 55734 <br /> Exp 1 <br /> Hagop Kevork <br /> Q <br /> P E No C55734 �'d Cl1ll1. <br /> Figure 1 Potentiometric Map lE OF 0 P, <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 /> 6983 yml Chain of Custody Document and Laboratory Analytical Reports <br /> e • <br />� <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 7555 <br />