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EL RANCHO ROCK & SAND, INC. QUARRY <br /> INVESTIGATION REPORT <br /> SLAB-1 SITE <br /> PAGE 6 <br /> cleaning mechanical parts, that occurred some time ago. The contaminant(s) appear to have <br /> weathered and volatilized. <br /> Regardless of the cause, the apparent soil contamination appears to have undergone sufficient <br /> intrinsic bioremediation (also known as natural remediation or bioattenuation) that it no longer <br /> presents a significant environmental threat. The bioassay test indicates that the gray sand <br /> material in the area of Slab-1 would not be classified as hazardous. <br /> Based on these conclusions, no soil removal, remediation or disposal is deemed warranted in this <br /> area. Site grading and demolition of the concrete slab in the Slab-1 area should be allowed to <br /> — proceed, pending approval from SJCDEH. As a precaution, however, the area should be <br /> carefully monitored during these activities. 'Visual obsery tions should be combined with FID <br /> _ monitoring. DG 0 <br /> 01 <br /> SCOTT W. LEWIS <br /> Respectfully subm ted, No. 1835 <br /> CERTIFIED <br /> _ ENGIi EERI T <br /> GEOLOGIST � <br /> Scott W. Lewis s�'14�" <br /> California Registered Geologist #5772 OF CAI-�F <br /> California Certified Engineering Geologist #1835 <br /> FILE: f:1PROJECT17961REP\SLABI.RPT <br /> CONDOR <br />