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I <br /> i FtNA14REMFDiA7"I0N IAT1 <br /> Shell 0a Ccmpany <br /> <20 West charter Way,Stockton,California <br /> Lima Project No.40-S&W <br /> ° Page 16 <br /> pumping test. <br /> L:4 Water samples for laboratory annlysis were collected at 9 hours,24 hours,34 hours itto the pump - <br /> Tlte semples showed the foilawln3 average cor ttraElasrs sof� ►eum�tituet;ts; <br /> t� <br /> Benzene-3.2 m94 <br /> Toluene-4.0 M94 <br /> j Xylenes-2.0 mg(i <br /> Ethyl Benzene:-0.38 M94 <br /> i <br /> 77H-2GM911 <br /> TTO(Total Toxic Organics)-7.54 mgA <br /> tuiraments frsr Lomat of, <br /> These 06 iceitratioaa in ground water will be used to detcrmino treatment req �..�. <br /> ` iced duttag iremedliil aeti '' '6.Copia bf original laboratory data Shects are incluidozd in <br /> 1} o,rOisridv:�a.er pard <br /> t ` Appendix D. <br /> 6' 5.2 Soil Ventin �t <br /> i•+ ,p <br /> Monitoring well MW-7 was initially subjected to a vacuum test by extracting hydroo bon vapor from he <br /> l y: well utilizing a portable blower. The test set up is shown in Appendixppcndix E <br /> f, given in A <br /> monitming wells MW-2,MW-3,and I41W-5 were ad; a'`and�ard cubic ire�perumainute per foot o`open well <br /> show that the average vapor flow from theweils was <br /> (scfmr'[t)at an average vacuum of 67 inches of water. The maximum now rate of vapor during the <br /> sneer, <br /> test was 44 scfm. <br /> g approximately <br /> The vapor concentrations exitingthe blower were measured with a TLV meter,and averaged app y <br /> 12,Wo parts per million vapor(ppmv)• <br /> ' 3.G Manifold stem Desi <br /> 1'! manifolded together to pt'ovift Yfor Sall 7por <br /> yells' tat he rite were - <br /> v s oekltoring ' <br /> i�1it '.`1 ii,t e _ .c•,. rSedr bpd water i <br /> } C It 'l M iu. 41= Ty bye n astaau�g w�f!a were manifbl l t�eth�s to prcmdo comp <br /> ` Best assumptions and detailed design <br /> r <br /> ri .,p1pUg to a[ia+v far 'g otth` `water extrasti:Y ' <br /> I cowiderations can be found in Delta's Interim Remedial Action Plan and proposed <br /> system <br /> schedule <br /> mer�ifald consistsOf <br /> t g dated April 13,1990,included in Appendix A of this repnrt. The sot!venting ys <br /> 2-inch-diameter valving and piping connected to a 4-inch main line which extends to the remedial equipment <br /> i <br /> i area at the southeast corner of the site. This manifold system will allow for pumping miS <br /> mately 100 cubic feet pc r minute(cfm)from each we <br /> tem manifold <br /> approxill. The ground water <br />