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a <br /> KLEINFELDER <br /> previous groundwater monitoring events conducted at the site.. The groundwater levels noted in <br /> the three wells monitored-have not displayed large fluctuations that most likely would not have <br /> been displayed throughout the course of natural seasonal changes. With the groundwater data <br /> supplied in this report, it is Kleinfelder's opinion this data will be sufficient to establish a <br /> baseline data base. <br /> Based upon the groundwater levels noted in the wells monitored for groundwater depth and the <br /> depth to groundwater noted from test borin s in the quarry,u <br /> P g Pp, it does not ear that there is a <br /> shallow groundwater component (above the naturally occurring groundwater depths) supplied by <br /> . Possible leakage from <br /> the California Aqueduct. It does not appear that substantial leakage (if <br /> any) from the.Califomia Aqueduct in the region of the DSS Vernalis Quarry is occurring at this <br />! time. Therese there does not appear to be the need for the installation of a groundwater <br /> p <br /> monitoring well between the quarry and the California Aque uct. Similar results were obtained <br /> b the installation of 'oundwater <br /> y gr monitoring wells near the sites eastern boundary and the Delta <br /> Mendota Canal. The results of groundwater monitoring events for these wells showed dry <br /> conditions with no leakage or seepage noted from the canal to the well screens. Kleinfelder does <br /> not recommend installing a monitoring well between the Quarry and the California Aqueduct at <br /> this time. <br /> Special consideration should be given to the sampling procedures for collection <br /> due to the lack of <br /> specialized sampling ports on or near the well heads. We recommend that the area from where <br /> the sample is collected be cleaned prior to collection to diminish the possible cross- <br /> contamination from an outside source. Due to the nature of the wells being used for sam ling <br /> and the goe eral age of the wells it may_not be appropriate to discusss�Jrofittin telleads <br /> with sampling apparatus. It is our opinion if strict sampling protocols .are followed and <br /> consistent methods of collection are maintained, sufficient quality of the samples collected can <br /> { <br /> be achieved. <br /> { Kleinfelder recommends that the groundwater monitoring program,continue in accordance with <br /> j the RWQCB M&RP No. 99-034. The next annual sampling event is to be completed in <br /> December 2003. A copy of this report should be forwarded to the RWQCB and Mr. Ray Borges <br /> of the EHD. <br /> LIMITATIONS <br /> 4 <br /> t <br /> Kleinfelder has prepared this report in accordance with the generally accepted standards of care <br /> which exist in northern California at the time of writing. It should be recognized that definition <br /> and evaluation of geologic and chemical subsurface conditions are difficult. Judgments leading <br /> to conclusions and recommendations are generally made with an incomplete knowledge of the <br /> subsurface and/or historic conditions applicable to the site. The conclusions of this assessment <br /> are based on field observations and analytical results obtained from soil samples collected from <br /> the site. More extensive studies may further reduce the uncertainties associated with this <br /> assessment. Kleinfelder should be notified for additional consultation if the client wishes to <br /> reduce the uncertainties beyond the level associated with this report. No warranty, expressed or <br /> implied, is made. <br /> 2913 LEO /ST03R781 Page 4 of 5 <br /> Copyright 2003 Kleinfelder,Inc. <br /> g June 2 2003 <br />