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Chevron Service Station 9-2033 <br /> Page 2 of 2 <br /> bgs at CPT borings SB-3 and SB-5 in years 2000 and 2001 indicate that groundwater <br /> may be locally impacted at approximately 85 feet bsg; a short screen well set in the thin <br /> sand at that depth at the down-gradient point on the property near SB-5 may effectively <br /> demonstrate vertical extent of impacted groundwater and lateral extent in that interval. <br /> EHD believes the advancement of CPT borings to the proposed minimum depth of 50 <br /> feet bsg may not quite provide the additional information needed to complete the vertical <br /> assessment of impacted soil and groundwater. EHD approves the soil and groundwater <br /> analyses as presented in the work plan for samples collected from the direct-push borings, <br /> and EHD directs that groundwater samples currently collected each quarter from the three <br /> on-site monitoring wells be analyzed for these same compounds. <br /> EHD will not comment at this time on the four proposed monitoring wells, but will after <br /> the results of the CPT investigation have been submitted, as the number and locations of <br /> proposed monitoring wells may change based on the CPT data. Following submittal of <br /> the CPT boring report, please submit an addendum to this work plan for proposed <br /> monitoring wells and provide the technical justification for the well locations and the <br /> screen intervals. <br /> EHD also approves completion of a sensitive receptor survey within a one-half mile <br /> radius of the site and the review of EHD files for LUST sites and private wells to <br /> augment the current data submitted by Secor in the Site Conceptual Model dated March <br /> 24, 2004. <br /> Please submit a drilling permit application along with an $89.00 permit fee for each <br /> parcel to EHD by July 13, 2005. Provide EHD with copies of the access agreements <br /> when submitting the permit applications. Also provide EHD with a copy of the health <br /> and safety plan for our information prior to the fieldwork, and notify EHD at least 72 <br /> hours prior to commencing the fieldwork. <br /> If you have any questions regarding this letter, please contact Vicki McCartney at (209) <br /> 468-3456, or by electronic mail at vmccartney@sjcehd.com. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Victoria L. McCartney, Senior REHS Nuel C. Henderson, Jr., P <br /> Unit W-Site Mitigation Unit IV- Site Mitigation <br /> c: George Forsythe, PG - Secor <br /> James L.L. Barton, PG- CVRWQCB <br />