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ETS ENVIRONMENTAL & ASSOCIATES <br /> PSR-1 PAGE 3 <br /> Based upon the findings, field observations, and <br /> analytical results, ETS Environmental & Associates makes the <br /> following recommendations : <br /> 1) Further definition will be necessary to determine <br /> the areal extents of soil and groundwater <br /> contamination at the Site. <br /> 2 ) The three existing monitoring wells should be <br /> sampled on a quarterly basis to check for changes in <br /> contamination levels . The groundwater gradient and <br /> flow direction should also be calculated quarterly <br /> to indicate any possible changes in contaminant <br /> migratory paths . <br /> 3 ) The highest groundwater contamination levels were <br /> found at monitoring well 1 which is apparently up- <br /> gradient from the former UST pit and product lines. <br /> Therefore, a monitoring well should be placed <br /> further up-gradient (in the direction of MW-1) from <br /> the former UST pit. This additional well would be <br /> useful in the verification of whether the <br /> contamination at MW-1 is possibly coming from an <br /> off--site source . <br /> Should you have any questions or concerns regarding <br /> that date or the information included within this report, <br /> please do not hesitate to contact our Merced office at (209) <br /> 384-1041 . <br /> Prepared by: <br /> Walter H. Todd III <br /> ETS Project Geologist <br /> Reviewed by: <br /> Dan Anderson <br /> Project Manager <br />