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5.0 cONCLUSIONS ANO Ilh;(:`th11111,N1)1'I'1U15 After three Sanlplitzg evemS all 91-outul wtttrr lKiS !)eco Iound to he tiondetectable for TE-1-1- diesel. Recent samplin-ui11Llic,,jLcs that cnuet?ittc;uions of earlier detected VOC are still at low measurable levels beneath the site. Since no VOC were detected in the soil there is a strong possibility that these hydrocarbons originated off site. A cloeurnent seareh will he Conducted to verify that possibility, l3'C1?X concentrations are very low and Should pose no risk to the ne.n-cst lien, %,,ell whic,) i, nearly 1 mile to the Solithwest. Natural biodegradation will also reduce exiSting in the Soil. In view of these NSultS, E?SE recommends that the former tank excavation material be left in place. AT&T should obtain one additional Set of ground-water samples oil a quarterly basis to confirm the initial results Of s.u)tpling and con)plete a year of monitoring. Sampling should tale place near the date November G, 1991. ESE will request that no further action be required and that written site clo,cn-e €)e granted Irom the County and the Regional 1' tr ; Board in regard to the owner underYiouncl diesel to)1: at the subject facility. i s, .. u Y;