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RECOMMENDATIONS <br /> The work covered in this report verifies earlier work concerning the geotechnical lithology of the site <br /> . and the area to the northeast within the State Route 4 right of way. The sand stratus between thirty- <br /> five feet and sixty-five feet are the main conduits of the contamination migration. <br /> It is recommended by this author that a monitoring well with a total depth of sixty feet and ten feet <br /> of screen be placed in the sidewalk on the north side of Lafayette street. This sand strata has the <br /> highest potential for contaminate migration. It is also recommended that a CPT to one hundred feet <br /> be installed down gradient in the State Route 4 right of way about two hundred feet northeast of the <br /> UST excavation. It is also recommended that a second CPT be installed about two hundred feet east <br /> of the UST excavation in the side walk on the south side of Lafayette street. These two CPT's would <br /> further define the vertical and horizontal extent of the contamination plume. <br /> It is recommended that future quarterly water samples be analyzed for oxygenates to help determine <br /> the source of these compounds. <br /> Any questions on this report should be directed to Ervin Rifenburg,at Foothill Engineering 209/368- <br /> 9381. <br /> Respectfully submitted, <br /> Foothi En neeri <br /> ZV <br /> Ervin Ri n , P P. , <br /> cc: Olivarez <br /> r4erz-Wu <br /> 4 <br />