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i 6 ETTLER -- YAN INC . January 13, 2000 G-R Job 4180175 Mr. Edward C.Ralston Tosco Marketing Company 1380 Lead Hill Road, Suite 120 Roseville, California 95661 RE: Fourth Quarter 1999 Groundwater Monitoring& Sampling Report Tosco(Former BP Oil) Service Station#11195 16500 South I-5 Lathrop, California Dear Mr. Ralston: This report documents the groundwater monitoring and sampling event performed by Gettler-Ryan Inc. (G-R). On November 19,1999,field personnel monitored and sampled ten wells(MW-1,MW-2,MW-3,MW-5,MW- 6, and MW-8 through MW-12) at the above referenced site. One well (MW-4) was inaccessible. Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons. Separate-phase hydrocarbons were not present in the wells. A Potentiometric Map in included as Figure 1. Dissolved oxygen concentrations are presented in Table 3. Static water level data and groundwater elevations are summarized in Table 1. Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating Procedure - Groundwater.Sampling (attached). The field data sheets are also attached. The samples were analyzed by Sequoia Analytical. Analytical results are summarized in Tables 1 and 2. A Concentration Map in included as Figure 2. The chain of custody document and laboratory analytical reports are also attached. Sincerely, e�L. Harding Project Coordinator p�G Jc�s'J► O NO. �4r Dou las Lee Senior Geologist,R.G. 6882 F Figure 1: Potentiometric Map Figure 2: Concentration Map Table 1: Groundwater Monitoring Data and Analytical Results Table 2: Groundwater Analytical Results - Oxygenate Compounds Table 3: Dissolved Oxygen Concentrations Attachments: Standard Operating Procedure- Groundwater Sampling Field Data Sheets 11195 qml Chain of Custody Document and Laboratory Analytical Reports 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 i