ARCHIVED REPORTS_XR0007449 CASE 1

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k" KLE [ NFELDER A possible explanation of product occurring with a lowering groundwater level is a submerged screened interval being exposed to product as the groundwater level decreases However, based ' upon well construction details from MW-1 this does not appear to be the case The well screen interval ranges from an approximate depth of 25 to 45 feet bgs in MW-1 Depth to groundwater (measured from approximate ground surface) in MW-1 has ranged from approximately 32 58 to ' 38 03 feet since sampling began in June of 2000 ' 6 2 RECOMMENDATIONS Based on the data obtained during this assessment, Kleinfelder makes the following recommendations I Continue quarterly monitoring of the existing monitoring wells (MW-1, MW-2, MW-3, and MW-4) 2 Due to the presence of floating product in MW-1, Kleinfelder recommends additional purging and removal of any product layer in MW-1 ' 3 Kleinfelder recommends that a copy of this report be submitted to San Joaquin County Public Health Services Department, Environmental Health Division (PHS/EHD) and the State of California, Central Valley Regional Water Quality Control Board (RWQCB) for their review and comment 4 The purge water currently stored on-site should be evaluated and properly disposed of by the Client Klemfelder can assist the Client in the disposal process at an additional charge if requested by the client ' This report, and the conclusions and recommendations presented in this Executive Summary, are subject to the "Limitations" presented in Chapter 7 of this report Any other party (other than General Mills or regulatory agencies having enforcement jurisdiction for this site) who would like to use this report shall notify Kleinfelder, Inc of such intended use by executing the "Application for Authorization to Use" which is included as an appendix to this report 1 28209 T03/ST03R1312 Page IO of l l ' 0 2003 Kleinfelder, Inc September 22, 2003