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+ r a <br /> �t <br /> 6ETTLER - RYAN INc. <br /> r December 20, 1999 <br /> G-R lob#180137 <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, California <br /> i <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 3 0, 1999, field personnel monitored and sampled twenty wells <br /> (MW-1,MW-2,MW-3,MW-4D,MW4S,MW-5D,MW-5S,MW-6D,MW-6S,MW-7D,MW-7S,MW- <br /> 8S,MW-81,MW-8D,MW-9S,MW-9I,MW-9D,MW-10S,MW-101,and MW IOD)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 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 /> cerely, <br /> 0! <br /> Dea a L H d ng � � SEN J Cq,Q 0.'':A <br /> Project Coordinator F9 <br /> No. 5577 <br /> Stephen J Carte 9 <br /> Senior Geologist, R G No 5577 OF CAL�FO� <br /> Figure 1 Potentiometnc Map <br /> Figure 2 Concentration Map <br /> Table I 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 />