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KLEINFELDER <br /> 6) Based on review of soil logs from the push probe assessment (6/2000), former borings and <br />' monitoring well logs, it appears that the soils beneath the site in the vicinity of the former <br /> UST and within the water bearing zones (depths near 28 feet bgs and deeper) are <br /> predominantly clay with discontinuous layers of silts and sands Comparison of recent <br />' analytical results (June and July 2000) and lithology in the vicinity of the former UST does <br /> not appear to indicate preferential contaminant pathways and uneven distribution patterns to <br /> the north and northwest of the former UST Preferential contaminant pathways seem probable <br /> (via coarser materials) south and southeast of the former UST, which is generally up-gradient <br /> to cross gradient of the former UST (vicinity of MW-2) These trends however in <br /> Kleinfelder's experience are not unusual as subsurface geology can be highly variable and <br />' cause expected contaminant distribution patterns to vary <br /> Based on the data obtained during this assessment, Kleinfelder recommends <br /> 1 Continued semi-annual monitoring of the three existing monitoring wells (MW-1, N11W-2 and <br /> ' MW-3) <br /> 2 Kleinfelder recommends that a copy of this report be submitted to the RWQCB and <br /> ' PHS/EHD for their review and comment <br /> 3 Kleinfelder recommends a meeting/correspondence with PHS/EHD to discuss the findings <br /> within this report and possible Risk Based Corrective Action (RBCA) closure <br /> 4 The equipment decontamination rinseate, purge water and push probe returns (soil) should be <br /> ' properly disposed of by the Client Kleinfelder can assist the Client in that disposal at an <br /> additional charge if requested by the client <br /> This report, and the conclusions and recommendations presented in this Executive Summary, are <br /> subject to the "Limitations" presented in Chapter 9 of this report Any other party (other than the <br /> Wilbur-Ellis Company or regulatory agencies having enforcement jurisdiction for this site) who <br /> would like to use this report shall notify Kleinfelder, Inc of such intended use by executing the <br /> "Application for Authorization to Use"contained in Appendix F <br /> 20-4439-01 E01/2000R726 Page 15 of 17 <br /> Copyright 2000 Kleinfelder,Inc October 16,2000 <br />