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Mr. James Barton <br /> ' October 31, 2002 <br /> Page 5 of 5 <br /> average hydraulic gradient of approximately 0.08 feet per foot (ft/ft). This groundwater flow pattern is <br /> consistent with historical monitoring data as shown in Table 3. <br /> ' Free-Product Monitoring and Removal from Well MW-3 <br /> Marina personnel continued to monitor the condition of the hydrophobic, hydrocarbon-absorbent sock in <br /> ' well MW-3 on an approximate bi-weekly basis to assess the need for sock replacement. According to <br /> marina personnel, the sock was not replaced during the Third Quarter 2002 and no free-product was <br /> observed floating on the groundwater surface during the September 25, 2002, monitoring event. <br /> ' Third Quarter 2002 Analytical Results <br /> ' Groundwater analytical results for the Third Quarter 2002 are summarized on Table 1 and displayed <br /> graphically on Figure 4. TPHd was detected in wells MW-3 and MW-4 at respective concentrations of <br /> 380 and 250 micrograms per liter(µg/L). TPHg was reported at a concentration of 56µg/L in the sample <br /> from well MW-3, and was not detected above the reporting limit of 50 µg/L in well MW-4. TPHg and <br /> TPHd were not reported above the method detection limit in the sample from well MW-2. <br /> Comparison to Historical Analytical Results <br /> The concentrations of TPHd reported in wells MW-3 and MW-4 represent a decrease since the last <br /> monitoring event conducted in June 2002. Similarly, the concentration of TPHg reported in well MW-3 <br /> Nrepresents a decrease since the last monitoring event. <br /> SECOR plans to conduct the Fourth Quarter 2002 groundwater monitoring event in December 2002. <br /> Please contact us at(925) 299-9300 with any questions or comments. <br /> Sincerely, <br /> SECOR Internatigonnal Incorporated <br /> goran ruce Scarbro R.G. #4931 <br /> Project Geologist Managing Principal �E O <br /> cc: Mr. James Mills, Wes[rec Marinas � <br /> Mr. Mike Infuma, SJCEH r &Rt10ES 45+a4931 ix"9 0 <br /> ' Attachments: <br /> E <br />' Table 1 -Historical Groundwater Analytical Data pF CAL`rt <br /> Table 2—Historical Monitoring Well Sounding Data <br /> Table 3 -Historical Lateral Flow Directions and Gradients <br /> Figure 1 -Site Location Map <br /> ' Figure 2-Site Plan <br /> Figure 3 -Groundwater Elevation Contour Map—September 25, 2002 <br /> Figure 4-Groundwater Chemical Results—September 25, 2002 <br /> Appendix A-Hydrologic and Groundwater Sample Field Data Sheets <br /> Appendix B -Laboratory Analytical Reports and Chain-of-Custody Records <br /> ' 1:\Tower Park\QMR\2002 QMR\Q32002\.3rd QTR 2002.doc SECOR International Inc. <br /> SECOR Job No.050T.02926 11/1/02 1:56 PM <br />