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INC. <br /> GETTLER - RYAN <br /> June 11, 1999 <br /> G-R Job #180175 <br /> Mr. David Camille <br /> Tosco Marketing Company <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> RE: Second Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Tosco (Former BP Oil) Service Station x+11195 <br /> 16500 South I-5 <br /> Lathrop, California <br /> Dear Mr. Camille: <br /> This report documents the groundwater monitoring and sampling event performed by Gettler-Ryan Inc. (G- <br /> R). On May 20, 1999, field personnel monitored and sampled ten wells (MW-1 through MW-6 and MW-8 <br /> through MW-11) at the above referenced site. One well (MW-12) was not located. <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. A Potentiometric Map in included <br /> ` as Figure 1. Static water level data and groundwater elevations are summarized in Table 1. <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 and 2. A Concentration Map <br /> in included as Figure 2. The chain of custody document and laboratory analytical reports are also attached. <br /> Sincerely, <br /> Deanna L. Harding D 0 <br /> E0�p <br /> Project Coordinator � �`EN ��d',► <br /> • No.5577 <br /> Stephen J. Cater cP 4 <br /> Senior Geologist, R.G. 5577 7T�o <br /> F CAL <br /> Figure 1: Potentiometric Map <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 /> Chain of Custody Document and Laboratory Analytical Reports <br /> 11195.qml <br /> 6747 Sierra Court , Suite ,1 • Dublin , California 94568 ( 925 } 551 - 7555 <br />