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Three Palms Grocery ~- Page 2 <br /> 6732 Hwy 88 June 30, 2008 <br /> Stockton, CA <br /> The EHD approves of the chosen remedial alternatives for soil and groundwater at this site. Prior <br /> to approval of the installation of additional VE wells or utilizing VW1, VW2 and VW3, technical <br /> justification must be provided. <br /> A mass calculation for contamination in the soil was provided in the CAP Addendum which is twice <br /> the mass that was calculated in 2001. Many additional soil sample results have been obtained <br /> since the original calculation but the only soil results with high concentrations are those from VW4. <br /> Using Figure 4 in the CAP Addendum it is not clear what is Zone Area 1 and what is Zone Area 2. <br /> Please provide clarification of the zones and sample locations within the zones that were used to <br /> calculate the mass. <br /> A concise executive summary of the CAP that describes the contamination at the site and how it <br /> will be remediated must be prepared and submitted to the EHD. The executive summary will be <br /> used by the EHD for public notification, prior to final approval of the corrective action plan. Unless <br /> technical justification is provided for additional VE wells and the use of VW1, VW2, and VW3, a <br /> new drawing of the soil vapor extraction system layout should also be submitted. <br /> Please submit clarification information for the mass calculation, the executive summary of the CAP, <br /> technical justification if you still want to install additional VE wells and use VW1, VW2 and VW3 and <br /> a drawing of the soil vapor extraction system layout to the EHD by October 1, 2008. <br /> The Report shows that monitoring well MW5 has not been sampled since January 2008 and <br /> recommends attempting to locate and make accessible MW5 for monitoring and sampling. It is a <br /> violation of the San Joaquin County Well Standards to abandon (not use or properly destroy) a <br /> well, this well must be found. <br /> If you have any questions, please contact me at (209) 468-3449. <br /> Margaret Lagorio, REHS <br /> Program Coordinator <br /> c: Jim Barton, CVRWQCB <br /> Jeanne Homsey, ATC Associates,1117 Lone Palm Ave., Suite 201, Modesto, CA, 95351 <br />