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! oi;s-Ldlewda MarMt <br /> August 16,IM <br /> . Pit 1 at depths ranging from 11 to 17 feet bgs indicated no evidence of petroleum <br />! contamination at or above the reported laboratory detection limits. <br /> The source(s) of hydrocarbon contamination (the UST`s) have been removed from the <br /> Idlewlld Market site. However, a small volume of approximately 1 to 3 cubic yards of <br /> hydrocarbon impacted soil may be present from approximate 6 to 11 feet beneath the south end <br /> of the canopy foundation. The concrete foundation overlying the potentially impacted soil will <br /> hmlt infiltration and subsequent migration of surface water through the vadose zone thereby <br /> decreasing the potential for mobilization of contaminates. <br /> Based on the findings from this and previous investigations, Condor recommends no <br /> Ifurther remediation at this time Pit 1 was partially backfilled with pea gravel following the <br /> May, 1993, over-excavation. Following placement of a layer of geofabnc on top of the pea <br /> gravel, the remainder of Pit 1 should be backfilled with soil from the onsite stockpile to <br /> approximately 12-inches below grade Pit 1 should then be filled with road base material and <br /> paved with asphalt or concrete. Compaction testing should be performed after the placement <br /> of the stockpiled soil to ensure the structural integrity of the soil. In the event that the canopy <br /> is removed at some time in the future, removal of the suspected contaminated soil could be <br /> . evaluated <br /> At the request of the property owner, the remainder of the stockpiled soil would be <br /> spread on the lawn area of the property owner's residence located adjacent to Idlewild Market. <br /> The SJCPHS,EHD representative on site during drilling observed the proposed final location of <br /> the stockpiled soil. The proposed location is greater than 1,000 feet from the sewer drain <br /> located near the northwest comer of the intersection of Devnes Road and Highway 12 and no <br /> schools or residential areas are within 1,000 feet. 'R'W E Nq <br /> t <br /> Respectfully submitted, No 51592 <br /> W98 <br /> CIVIL <br /> �1 9r�OF CA��F°� <br /> c R. C Robert J. J E. <br /> reologist California eglstered <br /> Profession Engineer, Civil <br /> #51592 <br /> A\IDLWL.D Iter <br /> �� CONDOR <br />