Laserfiche WebLink
• tinary Environmental Assessment Report <br /> Pittman Elementary School,Stockton,CA <br /> December 10,2003 <br /> Page iii <br /> million). The cumulative hazard index is 0.824, which is less than the level of significance of 1.0 (unity). <br /> Therefore, the combined COPC pose a lifetime cancer risk greater than one-in-one-million, but do not <br /> pose a significant health hazard. The COPC that appear to pose the greatest cancer risk include <br /> hexavalent chromium, cobalt, dieldrin, and 1,3-butadiene. Lead in soil near structures at the proposed <br /> school site was analyzed separately for health risk using the DTSC Leadspread 7 Model, which indicates <br /> that lead concentrations pose a significant risk to human health. <br /> This assessment revealed evidence of recognized endangerment in connection with the property that may . <br /> result in a lifetime increased cancer risk greater than one-in-a-million and adverse health effects from <br /> lead. Figure 14 (Appendix A) identifies samples that lead to conclusions about areas of potential health <br /> concern. Based on review of the background information referenced in Section 2.0, the site visits <br /> performed by Condor, the laboratory analytical results of soil samples collected during the PEA, and risk <br /> and hazard calculations, Condor concludes the following: <br /> Lawn Area <br /> Concentrations of hexavalent chromium and cobalt in some soil appear to pose a potential health risk. <br /> Past use of pest control and gardening chemicals adjacent to structures has resulted in a residual <br /> concentration of chemicals in soil with some health risk. <br /> Stmctulce Dr line's <br /> Soil sampling around site structures identified certain areas where lead concentrations pose a significant <br /> health hazard. <br /> • Natural (;as Field <br /> No physical or health hazards associated with the former natural gas field were identified. <br /> Eastern Former Underground Storage Tanks Site <br /> No health hazards associated with the eastern former underground storage tanks site were identified. <br /> Northern FormerTinderground Storage Tanks Site <br /> Elevated cancer risk is indicated by soil gas sample results along the northern site boundary. <br /> Polychlorinated Ri hn eDyls (PCR) Sites <br /> No PCBs were identified at any of the sites tested. <br /> Condor recommends further action in the form of a Supplemental Site Investigation (SSI) to <br /> characterize the extent of contamination in the lawn area and the structure driplines. At this time, <br /> Condor also recommends a removal action to remove the lead contaminated soil. Additional <br /> removal actions may be required based on the results of the SSI. <br /> LIMITATIONS TO EXECUTIVE SUMMARY <br /> This executive Summary should only be read as a brief summary, and not as a complete discussion of the <br /> full report text. The scope of work and limitations should be understood prior to reading the site-specific <br /> information, results, and discussion. <br /> • <br /> 4 <br /> IL 4) CONDOR <br />