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Y r <br /> Shell Oil Sites <br /> Page 4 <br /> 880 Victor Road_Lodi <br /> Due to the high concentration of tertiary butyl alcohol(TBA) Shell stated that a groundwater <br /> extraction system as interim remediation to remove the dissolved MTBE and TBA mass may be <br /> inappropriate since treatment by granulated activated carbon (GAC) may be unable to separate the <br /> TBA compound from the extracted groundwater before discharge. <br /> Shell agreed to set up a telephone conference between Shell representatives (including chemists and <br /> geologists in Westhollow),Cambria and EHD to discuss other technologies or treatment options <br /> that could remediate the TBA and MTBE mass. Please schedule this conference with EHD by July <br /> 11,2005. <br /> Shell agreed to review soil vapor extraction (SVE) as a potential remediation of the contamination in <br /> the vadose zone as previously directed in an EHD letter dated October 27,2004. A report of this <br /> review should be submitted to EHD by July 31,2005. <br /> EHD agreed to provide requests in writing to Teresi Trucking and the San Joaquin County Mosquito <br /> Abatement District that they cooperate with Shell by providing the necessary access to their <br /> properties for installation of the monitoring wells. <br /> Please understand that not performing active remediation at this site is not an option at this time. <br /> 4315 Waterloo Road Stockton <br /> Shell agreed to submit the over-excavation report and EHD requests the report be submitted by July j <br /> 31,2005. Cambria will conduct the 2.d quarter sampling event during the third week of June. Shell j <br /> will review the over-excavation soil sampling results and if additional monitoring wells or soil <br /> borings are required,an addendum to the work plan dated September 17,2004 will be submitted. If <br /> not, Cambria will implement the remaining portion of the already approved work plan. <br /> 1160 Yosemite Avenue,Manteca <br /> There are low concentrations (<3 ug/L) of 1,2-DCA in groundwater samples from four of the five <br /> monitoring wells. EHD recommended that an SCM and a closure report(discussed in the Tri- <br /> q <br /> Regional Board Staff Recommendations dated April 16,2004) be prepared. <br /> If you have any questions or comments please contact the appropriate LOP staff overseeing the site <br /> or call me at(209) 468-3449. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> Margaret Lagorio,Supervising REHS <br /> Site Mitigation Unit <br /> c: CVRWQCB—James L.L. Barton,RG <br /> Cambria—Joe Neely,Aubrey Cool <br />