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rx � i�fir e ,t".� �o x _ „il ,r •r. �ri'�-=.'^T��� a�� �F?..3�,.� �"�.��� '�y �" +osi.Y�x�"�;'t'�oii� l.K� :7 'y _x� 3`.'' ,. <br /> 'f` ,..s"""'�+•=.rR - t-. -�':?`.' ',i �1,�,t� y�. .w- d.5?�¢ „a��L:.,y � �•..:�• C } +.�, f,. yr�r`� <br /> ib-.. ,x: F 'ex._ _ IE- jA;, ,,. <br /> t - -�"''- :i. `� C'g,v'-:Y"� '°' .' N1'._' .,",i-'"'v^ -,r nt ,'f"?�t.... r "" i».•. :'.s ...1. : <br /> 1 <br /> c <br /> : T FitdA4 RI:MF?DiATION FLAN <br /> Shelf Oil Company <br /> 620 West Charter Way,Stockton,Califomia <br /> i Delta Project Na 48$8-586 <br /> Page 16 <br /> I <br /> t; Water samples for laboratory analysis were collected at 4 hours,24 hours,34 hour into the pumping ust. <br /> 6e samples showed the f.Rowing average conr�ntsations of petrol�vm constituents:. <br /> 1d <br /> Benzene-3.2 mo <br /> Toluene-4.0 mg/l <br /> s� <br /> t ,,ylcneS-2.0 mgli <br /> Ethyl Benzene-0.38 03911 <br /> .1 TPH-20 mg/l <br /> t • <br /> TTO(Total Toxic Organics)-7.54 mgll <br /> Ih <br /> E These toncentralI in ground water will be used to de:;imine:cr+ratru.at requirements,for disposal:o r <br /> ground water produced daring remedial acttvrt,es:.Copics of original Iaboratory data sheets are included in <br /> i 4 Appendix D. <br /> 3,5.2 Soil Veotin Test <br /> Monitoring well MW-7 was initially subjected to a vacuum test by extracting hydrocarbon vapors from the <br /> well utilizing a portable blower. The test set up is shown in Appendix)~ As the vacuum test progressed, <br /> !e <br /> monitoring well MW-2,MW-5,and MW-5 were added to the vacuum. Calculations given in Appendix <br /> # ° show that the average vapor now from the wells was 1.5 standard cubic feet per minute per foot of open well <br /> k' screen(sclmlft)at an average vacuum of 67 inches of water. The maximum flow rate of vapor during the <br /> e test was 44 scfm. <br /> The%apor concentrations exiting the blower were measured with a TLV meter,and averaged approximately <br /> 12,000 part;ger million vapor(ppmv). <br /> 3.b Muulfold S stem Desi n _g <br /> ln":Mii&19W'seven monitorinZs.wells at.the-site were mamfolded to t ther'to provide for:soil r+rspor- <br /> &tractJ6ii TIu,ndditien,five monitoring wells were manifolded together to provide compressed air and vaster <br /> discharge piping to �,Il�a for grou:idt water extractipn. '-Design assumptions and detailed design <br /> i considerations can be found is Delta's Inte_im Remedia!Action Plan and Proposed Project Schedule letter, <br /> t' dated April 13, 1990,included in Appendix A of this report. The soil venting system manifold consists of <br /> 2-inch-diameter valving and piping connected to a 4-inch main line which extends to the remedial equipment <br /> area at the southeast corner of the site. This manifold system will .allow for a maximum flow rate of <br /> approximately 100 cubic feet per minute(cfm)from each well. Thr ground water pumping system manifold <br /> L'8 <br />