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r 1 • <br /> Equilon (Shell # 204-7524-4) page 2 <br /> 3011 W. Benjamin Holt Drive, Stockton. <br /> Equilon is hereby directed to submit a revised work plan that incorporates <br /> soil and groundwater sample collection and analyses from depths greater <br /> than 87' bgs. Included in this directive, and not limited to, is the requirement <br /> to install short-screened monitoring wells in ALL areas and depths where <br /> MtBE or any other petroleum contaminant has been previously detected. <br /> Equilon is to provide for repeatable groundwater sample collection to support <br /> conclusions of vertical and deep-lateral delineation of the groundwater <br /> petroleum plume. <br /> Equilon is hereby directed to collect and analyze an adequate and sufficient <br /> number of soil and groundwater samples to support conclusions for <br /> delineation of impacted soil and groundwater. All soil and groundwater <br /> samples are to be analyzed for TPH as gasoline, diesel, methanol, and <br /> ethanol by EPA Method 8015m and BTEX by EPA Method 8020. Additionally, <br /> all soil and groundwater samples are to be analyzed by EPA Method 8260B <br /> for 1,2-DCA, EDB, MtBE, TAME, EtBE, TBA, and DIPE. <br /> Equilon is directed to submit the revised work plan that incorporates all of <br /> the above noted concerns before April 12, 2002. The revision is to include <br /> proposed monitoring well construction details and an EHD well installation <br /> permit application and $89 fee. <br /> It should be noted that a Problem Assessment Report (PAR) is due for this site. As <br /> listed in the Tri-Regional Guidelines, Appendix A-Reporting, the PAR is to include <br /> results of field-testing or lab-pilot studies for multiple remedial alternatives and their <br /> feasibility of being effective in returning the site to 'pre-release' conditions. EHD <br /> recommends that Equilon anticipate the next phase of required investigation and <br /> take a cost-effective approach now by collecting field data in this next phase so that <br /> conclusions for remedial action feasibility can be supported by data. <br /> Donna Heran, REHS, Director <br /> Enviro�ealth Divisi n <br /> Michael J. Infurn'a Jr., enior F2EHS Marga io R HS <br /> LOP / Site Mitigation Unit IV Supervisor <br /> MI/ <br /> c: CVRWQCB — Marty Hartzell, Sacramento. <br /> c: Cambria — Joe Neely, PO Box 259, Sonoma, CA., 95476. <br />