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�13ti+3TilR TEGB_ <br /> � n2 <br /> GROUNDWATER <br /> L �. r TECHNOLOGY, INTC. <br /> March 12, 1932 <br /> Project Ntarnber 02320 225,U <br /> Ms. Margaret Lagorio <br /> Senior Environmental Health Specialist <br /> San Joaquin County <br /> Environmental Health Division <br /> P.O- Box 2009 <br /> 1601 East Hazel Avenue <br /> Stockton, California 95201 �I <br /> RE: PERMIT REQUEST <br /> BP CHEMICAL <br /> 3437 SOUTH AIRPORT WAY <br /> STOCKTON, CALIFORNIA <br /> I <br /> if <br /> Dsur Ms l_agorlo. <br /> As YOU requested during our phone conver tion on March 11, 19'_j2,j, rEaurm1water TF f-hno ogy?r::providing <br /> supplemental information to the work plan for the referenoenj site dat6ltl Septbrnber 24 1991. Plc;eSe review <br /> the information at your earliest convenience. <br /> I <br /> WELL CONSTRUCTION <br /> If data obtained during drilling indicate the need for mor..itoring wells. e Trolls will be CoPS�'l..Ctof 2-inch <br /> diameter, schedule 40 PVC pipe. A 15-foot screened inter�al 1:0.020''nch sect) VV',! be sat tat 14 aet below <br /> the tlrst encountered water. A filter pack consisting of Lapis Luotre 21112 sand wi!i ';;I the enr,u`Lis up <br /> to two feet above the screen. A 1-foot thick layer of hydrated bentoil*e pellets Will he Set :above the filter <br /> pack In order to Seal the well- The remaining annulus will be E'!Ied with a rtPat C tr:;nt grown tremW into - <br /> place. The wellhead,Trill be protected with a watertight traffic-rated ru`[d box., the road box will be elevated <br /> slightly to facilitate drainage of surface waters away from the well, 13't0a tap.raf ft well M:L be fitted v;th a <br /> looking expansion cap. A schematic diagram of well completion is '�'Agnetj. <br /> WELL DEVELOPMENT <br /> i <br /> If groundwater monitoring wells are installed in the borings,the wells W11 by fully develop:�d at"east 72 hours <br /> after m-�siruction. Well development will be accomplished by surgihg and bailing the *_:tlls to fidaitate, <br /> removal of the fine material from tht; well and filter pack. TISla process wil! enhance hydraulic <br /> communication between the well and the curroundIng aquifer. VIIateW rprftoved lay the well development <br /> process will be stored on site In Department of Transportation (DOT)'appror 17 H, 55-ga)'-on.containers <br /> pending results of laboratory analyses. <br /> MONITORING WELL. SAMPLING r <br /> Groundwater sampling will`occur at least 72 after well develop; ent before sampling, the-;aeils will ` <br /> fi <br /> 0 cag mrd oven;03 <br />