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=z ETTLER - YAN INC. <br /> December 29, 2000 <br /> G-R Job#180175 <br /> Mr. Edward C. Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 E <br /> Roseville,California 95661 rr-pp�rr rr}} gg II rr ``142001 <br /> C�1IV��lV1��r+iF�L{lfj �, { <br /> RE: Fourth Quarter 2000 Groundwater Monitoring &Sampling Report <br /> Tosco (Former BP Oil) Service Station#11195 <br /> 16500 South I-5 <br /> Lathrop, California <br /> Dear Mr.Ralston: <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc. (G-R). On November 13,2000,field personnel monitored and sampled eleven wells(MW-1 through MW-6 <br /> and MW-8 through MW-12) at the above 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.- 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 /> Deanna L. Harding SERED GEp <br /> Project Coordinator <br /> c� <br /> NO.6682 <br /> Dkologist, <br /> Lee <br /> SR.G. 6882 ��- <br /> 9rF CF CAL1F4�� <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 /> Table 3: Dissolved Oxygen Concentrations <br /> i Attachments: Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 12195.gml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 -7555 <br />