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*nary Environmental Assessment Report <br /> Pittman Elementary School,Stockton,CA <br /> December 10,2003 <br /> Page 27 <br /> •' <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 /> Structure Dr' ltp ines <br /> Soil sampling around site structures identified certain areas where lead concentrations pose a significant <br /> health hazard. <br /> Natural Gus Field <br /> No physical or health hazards associated with the former natural gas field were identified. <br /> Eastern Former T lnderaro m�torage.Tanks Site <br /> No health hazards associated with the eastern former underground storage tanks site were identified. <br /> • Northern Former Underground Storage Tanks Site <br /> Elevated cancer risk is indicated by soil gas sample results along the northern site boundary. <br /> Polychlorinated Biphenyls (PCSites <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 /> 11.0 LIMITATIONS <br /> The scope of work for this report is intended to provide a limited review of certain information related to <br /> the possible presence of contamination ("recognized environmental condition') at or beneath the site. <br /> This report is not intended to eliminate all risk of the subject property bearing some degree of <br /> environmental liability. Condor cannot and will not warrant or certify that the site is free of contaminants <br /> because it is impossible to know if such a condition exists. Although risks can never be eliminated, more <br /> detailed and extensive investigations yield more information. This information may help facilitate <br /> management of risks. <br /> This project was performed in general conformance with a work order proposal dated July 2, 2003 and <br /> approved by the District. The scope of work for this project was limited to an evaluation of <br /> environmental concerns associated with the potential presence of hazardous materials in conjunction with <br /> • current and previous activities on a property and did not include other services that are not described in <br /> A 1 <br /> i1� CONDO <br />