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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 observations should be combined with FID <br /> monitoring. <br /> DG nZ. <br /> G' <br /> Respectfully sub tted, �� SCOTT W. LEWIS <br /> No. 1.835 <br /> — CERTIFIED <br /> ENGINEERING <br /> Scott W. Lewis GEOLOGIST <br /> — California Registered Geologist #5772 <br /> California Certified Engineering Geologist #1835 OP CA-W <br /> FILE: f:1PROJECT17WREP1SLAB 1.RPT <br /> %4 CONDOR <br />