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for Additional Groundwater Investigation Report CSUS Multi-Campus Regional Center August 19,2003 Page 10 �. Maximum Contaminant Level (MCL; 0.5 pg/L) indicates that it is the most important petroleum �s hydrocarbon constituent at the site relative to additional investigation, monitoring, and remediation. Figure 9 in Attachment A shows the estimated lateral extent of 1,2-DCA in groundwater at concentrations greater than 100 parts per billion (gg/L). A cross-section showing the estimated extent of 1,2-DCA contamination at concentrations greater than 100 µg/L is shown in Figure 10, Attachment A. The location of the cross-section is shown on Figure 9. Based on the results of the additional groundwater investigation, Condor recommends the installation of additional monitor wells at the site to investigate and monitor deep groundwater in the source area and ;" shallow and deep groundwater in the down-gradient portion of the site. Condor's previous recommendation to conduct soil over-excavation and ozone sparging in the source area appears to remain viable based on the investigation results. The results indicate that a very large percentage of soil and groundwater contamination can be addressed by the indicated remedial measures. However, Condor does not recommend that any further work be conducted at the site until the site disposition, relative to soil over-excavation and the demolition of the site structures, is decided. Any monitor wells that are installed and the three existing monitor wells will potentially be destroyed during the proposed soil over- excavation and the anticipated structure demolition activities at the site. ' 6.0 LIMITATIONS &W Condor developed the interpretations and conclusions resented herein in accordance with P rP P generally accepted principles and practice. Conclusions presented in this report are professional opinions based on limited information obtained at the time of our site visits, Condor has endeavored to determine as much as practical about the site using conventional practices given our scope of services. Condor makes no representation as to the subsurface conditions at locations or times other than those sampled by our employees and reported in this document. If any changes are made or errors found in the information utilized in this report, the interpretations and conclusions contained herein shall not be considered valid unless the changes are reviewed by Condor and either appropriately modified or re-approved in writing. This report was prepared by Condor under the direct supervision of a Registered Geologist in the State of California. Any questions regarding the content of this document should be addressed to Don Kresse at ti (209)284-0518. Respectfully submitted, CONDOR EARTH TECHNOLOGIES, INC.Ze e- , Q �Irl t. No. 6430 Micheline Doyle Kipf Donald F.Kresse Staff Geologist California Registered OF 0l,�1Fa L- Geologist 46430 P:13024 CSUS-Multi-Campus\ReportslAdditional GW Inv.April 20031Addt1 GW Report May 2003.doe CONDOR i..