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3147 South El Dorado Street <br /> Page 2 of 2 <br /> i <br /> additional investigation is needed. To be sure that the SCM will adequately address the assessment, <br /> remediation and, ultimately, final closure requirements for this site, please include the following, as <br /> appropriate, in the SCM: <br /> • Local and regional plan view maps with sources, boring and monitoring well locations, <br /> lines of cross section, extent of contaminants in each media, direction and rate of <br /> groundwater flow, and receptor locations, including water supply wells within 2,000 feet of <br /> the site (Please note that previously submitted maps showing the locations for the former <br /> USTs have consistently had the east and west tank sides reversed.) <br /> • Cross sections showing subsurface geological features, depth to groundwater, man-made <br /> conduits, monitoring well construction and the interpreted vertical extent of soil and <br /> groundwater contamination <br /> • Cross-plots of key chemical concentrations verses time for representative wells that <br /> demonstrate significant contaminant concentration trends <br /> • Summary tables of contaminant concentrations in the different media <br /> • Well and boring logs <br /> • Narrative description of the SCM that describes controls on contaminant distribution; <br /> contaminant migration mechanisms, pathways and rates; plume disposition over time; and <br /> sorbed and dissolved contaminant masses. <br /> An adequate SCM can be utilized to account for most of the known data and to illustrate additional <br /> assessment needs thereby providing the justification for work proposed in future work plans. All <br /> analytical data should be included in tables. Methods and calculations of contaminant masses <br /> should be included in the SCM. If the SCM demonstrates that the site is now well characterized, <br /> several methods for the remediation should be evaluated and presented in a corrective action plan <br /> (CAP) submitted concurrently with the SCM. <br /> Monitoring wells both on and off-site were surveyed in December 2004; however, EHD has not <br /> received this survey report. Please include this survey report in the next quarterly groundwater <br /> monitoring report submitted to EHD. <br /> Please contact Vicki McCartney at (209) 468-3456 or by email at vmccartney(@,sjcehd.com if you <br /> have any questions regarding this letter. <br /> Donna Heran, REHS, Director <br /> �Environmental Health Department <br /> Of <br /> Victoria L. McCartney, Senior REFS Nuel C. Henderson, Jr., PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: James L.L. Barton, PG — CVRWQCB <br /> Timothy Cuellar - AGE <br />