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n} <br /> J ` <br /> 6ETTLER - RYAN INC. i <br /> • September 22, 1999 <br /> T 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 Third Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station #5886 <br /> 2701 West March Lane <br /> Stockton, California r <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler- <br /> ' Ryan, Inc (G-R) On August 16, and 17, 1999, field personnel monitored and sampled twenty wells(MW- <br /> 1, MW-2, MW-3, MW-4D, MW-4S, MW-5D, MW-5S, MW-6D, MW-6S, MW-71), MW-7S, MW-8S, <br /> MW-8I, MW-8D, MW-9S, MW-91, MW-9D, MW-1OS, MW-101, and MWlOD) 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 I A Potentiometnc Map is included as Figure i <br /> Groundwater samples were collected from the monitoring 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 /> Sincerely, <br /> Deanna LHardin; al C <br /> �S� GJ <br /> Project Coordinator <br /> % '\JLL NOAM <br /> Douglas Lee <br /> Senior Geologist, R G No 6882 4P <br /> 9 <br /> Figure 1 Potentiometric Map �F Cit', <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Rcsults <br /> {� Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Attachments Standard Operating Procedure - Groundv ater Sampling <br /> Field Data Sheets <br /> 5886 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 { 925 ) 551 - 7555 <br />