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' eola uaI rec"ucs! G g Kc. Page 7 Groundwater Monitonng Report Project No 770 2 ( 1 June 15,2004 In Figure 9-- MW-5 & MW-105 TPH-D versus Groundwater Elevation, well MW-5 ' contaminant concentrations have previously correlated with changes in the water table Since September 2001 the relationship has been reverse Well MW-105, screened below the water table, exhibits a typically inverse relationship between contaminant concentrations ' and groundwater elevation GTI makes the following recommendations • Maintain the quarterly monitoring schedule and cease the monthly • Develop a conceptual model for the site to determine if there are data gaps that should ' be addressed prior to completing the site characterization work • Perform a pilot study of in situ treatment alternatives A work plan for this work was submitted to the San Joaquin County PHS/EHD in September 2003 and they have ' requested additional information on the proposed pilot test GTI is developing a response to address the County's concerns 3.0 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 1