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i Mr. Joe Aldridge - 3 - 12 June 2008 <br /> ST Services Stockton Terminal <br /> provide data that could clarify whether the soil overlying each groundwater sample is a <br /> source of pollution, and these data would be useful in preparing NuStar's conceptual site <br /> model. The revised Work Plan must describe how the data obtained during this <br /> investigation will be used and what rationale will be applied to determine whether or not the <br /> soil and groundwater contamination underlying and downgradient of the Site are <br /> attributable to the NuStar facility. In addition, the sampling plan must be amended to <br /> specify submittal of the soil samples for laboratory analysis for the same suite of analytes <br /> proposed for the groundwater samples. <br /> 3. NuStar is proposing to sample UP/MW-4S until UP/MW-1 can be located. However, the <br /> Site Plan, Figure 2 of the First QMR, shows that UP/MW-3 is a little closer to UP/MW-1. In <br /> addition, the data in Appendix F appears to show that UP/MW-3 has never been sampled <br /> after it was installed in 2004. NuStar needs to clarify why this well is not monitored and why <br /> UP/MW-4S was selected instead of UP/MW-3. <br /> In summary, by 25 July 2008, please submit a revised Work Plan to complete site <br /> characterization more quickly, preferably using the Triad Approach. If you have any questions <br /> regarding this letter, you mpy contact me at (916) 464-4811 or betaylor(a waterboards.ca.gov. <br /> BRI P.G. <br /> Engineering Geol6gist <br /> cc- Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Ms. Rita Koehnen, Port of Stockton, Stockton <br /> Mr. Jerry Stauffer, Valero, L.P., San Antonio, TX <br /> Ms. Amanda Spencer, Ash Creek Associates, Inc., Portland, OR <br /> Mr. Rusty Benkosky, SECOR International, Inc., Rancho Cordova <br />