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4 � - <br /> Mr.Clint Rogers <br /> September 11, 1991 <br /> Page 3 <br /> notilfed and cotlactlon of this water was scheduled for August 1991,following the routine monitoring and <br /> wir4AIng activity scheduled for July 25, 1£91. The monitoring and sampling report of this acthty of July <br /> 25,1991, Is pending. <br /> A 2400t-thick day f of hydrated bentonite pellets was placed from 30 to 28 feet below grade,above the <br /> f1tGr pack,and the well was s6alad to grade with cement grout. The wellhead was equipped with a <br /> locking crap and encased In a traffic-ratted street box. Calcium chlorkfe was mixed with a thickened <br /> cement slum to promote rapid setting of the oonerbte encasing the surface traffic stmat box. This was <br /> done In cons AW[on with Mc Knoll of the SJCEHD In an effort to avoid damage to the wellhead by <br /> vahWar traffic. <br /> Flowing Installation,the nem monitoring Well (MW-4)was surveyed on July 25, 1991. The surveyor's <br /> map, Inclrscil:V'6evation and horizontal distance data,is attached':attachment E). <br /> Tne resu is of the tabu story analyses performed op the soli sample collected from the soff boring.and <br /> the composite sample cell(tcted from the Wee drums of soli were Wow the method detection Ilmits <br /> (MDL)for TPH-as-gasollne and for BTEK Based upon the composite sample laboratory resui<s.verbal <br /> approved wevu given by the SJCEHD on August 8, 1991,to spread the drill cuttings at the site. <br /> If you have any questions or require additional Information,please call our Concord office at <br /> (510)671-2387. <br /> Shicerely, <br /> GROU14DWATER TECHNOLOGY, INC. <br /> gred'HaydPi <br /> J <br /> Project.;;edaglst <br /> P ec�t Managery @ROFESsi�N <br /> � n,Dullivan Lar <br /> rri <br /> PWesslonal Engineer ivo, tG? 3 <br /> No.018253 <br /> - ... <br /> ----- ------ <br /> Attachments lFOF CALIO�N\ <br /> LMINAFH <br /> �• <br /> PDM) <br /> r GROUNDWATER <br /> TECHNOIACY,INC. <br />