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Crrjundwa.t e r <br />' The present hydraulic gradient is to the southeast In 1990 it <br /> was to the northwest Recent groundwater maps of the area ( San <br />' Joaquin County Flood Control 1991 and 1966) indicate a regional <br /> hydraulic gradient toward the east The latest gradient <br />' confirms that This site has no down gradient well at present <br /> and no down gradient well on the site would gi-ve meaningful <br />' information beuause of its close proximity to the source area <br /> Drilling at Charter Way we understand is prohibited <br />' In a discussion with a county health inspector, he stated the BP <br /> Station catty cornered to our site in a southeasterly direction <br />' had drilled and obtained a water sample sometime ago The <br /> sample had non--detectable readings for fuel. This indicates the <br />' plume zero line is somewhere between our site and the BP site. <br /> Groundwater remediation should be designed to draw back the <br /> airoundwater from under Charter Way to assure The water is <br /> dcconta.minated <br />' ��mf;cl i fkt z Ma <br />' This site is an operating gas station, therefore, any <br /> remediation effort should not effect the operation of the <br />' business The options for on site clean up for soil are vapor <br /> extraction or bio-remediation We feel the vapor extraction <br /> 1 method will work best at this site <br /> The vadose zone contains a considerable amount of clay which is <br /> not easily decontaminated by any method During the drilling of <br /> April 1992 an effort was made to ,fudge the permeability of the <br />' cores taken This was done by simply blowing air from the mouth <br /> into each core and rating the resistance on a subjective scale <br /> We found the permeability to be poor for the first 10 feet which <br /> is an area of suspected slight amounts of contamination, other <br />' than that the permeability of the site was ,fudged good to fair <br /> 10 <br />