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.a6ETTLER .— RYAN INC. <br /> June 22, 2001 <br /> G-R Job#180175 <br /> Mr. Edward C. Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE: Second Quarter Event of May 11,2001 <br /> Groundwater Monitoring & Sampling Report <br /> Tosco (Former BP Oil) Service Station #1.1195 <br /> 16500 South I-5 <br /> Lathrop, 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. A Potentiometric Map is included <br /> as Figure 1. Dissolved oxygen concentrations are presented in Table 3. Static water level data and groundwater <br /> 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 /> ,l <br /> Deanna L. Harding c,ZE C GED <br /> Project Coordinator �C,�o�GIAS �G'id, <br /> No. 6882 <br /> Doug s Lee <br /> Senior Geologist,R.G. 6882 `'�'A <br /> Figure 1: Potentiometric Map V�FCF CAL�FO�� <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: Dissolved Oxygen Concentrations <br /> Attachments: Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 11195. mi_ Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Vierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />