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I <br /> E T T L ER - YA N INC. <br /> April 10, 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: First Quarter Event of February 9, 2001 <br /> Groundwater Monitoring & Sampling Report <br /> Tosco (Former BP Oil) Service Station#11195 <br /> 16500 South 1-5 <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 fieldwork 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 /> n rely, <br /> DWC� R>`D GFa <br /> anna . Harding �`� LAS Co <br /> Project Coordinator <br /> Pio. 6,32 <br /> Dou as Lee <br /> Senior Geologist,R.G. 6882 <br /> T6e,OF CAL�F�Q~ <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 /> s Table 3: Dissolved Oxygen Concentrations <br /> Attachments: Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 11195.gm1 Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925) 551 - 7555 <br />