Laserfiche WebLink
a <br /> Kevin Allen <br /> Tage 2 <br /> j <br /> :The Vertical Went of the soil contamination in the area directly beneath the farmer tank and the quality of <br /> dile groundwater beneath the farmer tank still need to be investigated. Additional soil borings and monitoring <br /> wells are needed to adequately assess the groundwater conditions. A minimum of three monitoring wells are <br /> :used to obtain groundwater samples and also to monitor the groundwater for gradient and flaw direction <br /> ainformation. The wells will also provide information on any influence the production and domestic wells in <br /> the Aso may have on the groundwater flowl patterns. <br /> 'Additionally,for a complete investigation,a monitoring well must be located in each down gradient direction <br /> identified:for this site. <br /> .The installation of monitoring wells at this site is technically feasible, In San Joaquin County.there are many <br /> 'monitoring wells constructed to depths greater than 90 feet below ground surface(BGS), T the completion of <br /> xrtonitvring well M'4V#1 to a:maximum of 90' BGS was due to the lack of adequate auger lengths at the site <br /> at the time of the drilling. <br /> PHS/EHD will use the information generated from this work to evaluate whether the contatri ttatictn formthe <br /> former diesel tank is an actual and/or, potential threat to groundwater. PHS/EHD cannot make this <br /> determination without this information. <br /> Benzene is a known carcinogen And:is a constituent Lound in some diesel:t%baures. It is the Mbgt mobile of <br /> the aromatic constituents.: and the detection of benzene in wells may indicate a migratWg edge!,of-a: <br /> contaminant plume: Therefore, it is essential thatthe levels of contamination in the domestic we1tS` be. <br /> monitored:on a:regulair basis. Until the quality of the groundwater beneath the former:diesel tank is <br /> determined,the tank pit:area is:tottsidered to be a possible Source to the et�ntamination found.in:.tlte domestic <br /> 'Wells located: neatby, <br /> "Ile workplan o:investigate the above noted areas of concern shall be submitted by August 25,1"3. <br /> if you have anyyquestions or comments regarding this letter,please contact Linda Turkatte,Senior REFS,of <br /> guy staff at(om):468-moi. <br /> ]'trg ;I�astria,ll+I�,11tiPH. <br /> H�ltlt:�fft�r , <br /> J <br /> t <br /> urie A..Cotulla,RENS,Program Manager I <br /> Environmental.Health Division I <br /> .0 <br /> V <br /> j:4 CMW., M"'Elizabeth.Thayer <br /> c: Wilson,:Sonsitti:floodt •Debra Summers <br /> ''I'wo::Palo.:�cito auto <br /> P61o.Alto,,CA 945W, c <br /> C <br /> t ,: s <br />