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E T TL ER - INC.YAN <br /> � NC. <br /> September 6, 2000 <br /> G-R Job#180238 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95651 <br /> RE Third Quarter 2000 Groundwater Monitoring&Sampling Report <br /> Former Tosco (Unocal) Service Station#4409 <br /> 1502 N El Dorado Street <br /> Stockton, California <br /> ti <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R) On July 5, 2000,field personnel monitored and sampled four wells (MW-1 through MW-4) at the above <br /> referenced site <br /> Static groundwater levels were measured and all wells at the referenced site were checked for the presence of <br /> separate-phase hydrocarbons Separate-phase hydrocarbons were not present in any of the wells Static water <br /> level data and groundwater elevations are summarized in Table I A Potentiometric Map is included as Figure <br /> Groundwater samples were collected from the monitoring wells as specified by G-R 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 A Concentration Map is included as <br /> Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> Sin rely, <br /> Deanna L Harding RED GED <br /> oject Coordinator <br /> No. 6882 <br /> Dou as <br /> Project Geologist, RG No 6882 �r <br /> Figure I Potentiometric Map <br /> yrFQF cp,�.��°�� <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 /> 44119 qrW Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925) 551 -7555 <br />