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cwlogaal rechccs lie Page 6 Groundwater Monitonng Report Project No 724 2 May 15,2003 In their correspondence dated April 24, 2002, the San Joaquin County Environmental Health Department (SJC/EHD) directed the submittal of a work plan for additional lateral plume definition GTI prepared this work plan on June 27, 2002 On September 3, 2002, Mr Nuel Henderson of SJC/EHD issued a letter requesting modifications to the work plan ' On September 25, 2002, GTI submitted a letter modifying the June 27, 2002 work plan The modifications have been approved by SJC/EHD and the work has received cost pre- approval from the USTCFP Implementation of the work is projected to start in May 2003 The goal of the revised plan is to target certain sand horizons for discrete screen monitoring and determine if preferred paths of migration may have allowed elevated concentrations to tbe missed by the current well spacing 4.0 LIMITATIONS This report was prepared in accordance with the generally accepted standard of care and practice in effect at the time Services were rendered It should be recognized that definition ' and evaluation of environmental conditions is an inexact science and that the state or practice of environmental geology/hydrology is changing and evolving and that standards existing at the present time may change as knowledge increases and the state of the practice continues to improve Further, that differing subsurface soil characteristics can be experienced within a small distance and therefore cannot be known in an absolute sense All conclusions and recommendations are based on the available data and information. ' The tasks proposed and completed during this project were reviewed and approved by the local regulatory agency for compliance with the law No warranty, expressed or implied, is made 1 1