Laserfiche WebLink
Ms. Diane Hinson <br /> w April 13, 1990 <br /> Page 3 <br /> i Manifold System Desmon <br /> f Seven monitoring ot'elis at the site were menifolded togcrher to ptavide for future soil vapor -xtraction. <br /> In addition, five monitoring wells were tnanifolded together to provide compressed air and water <br /> discharge piping to allow for ground water extraction in the future. Design assumptions at;d dztailed <br /> design considers•ions are presented in Appendix A. The soil venting system manifold consists of <br /> 2-inchdiameter valving and piping connected to a 44nch main line which extends to the remedial <br /> equipment area at'the southeast corner of the site. This manifold system will allow for a maximum <br /> flew rate of approxitnate?y 100 cubic feet per minute (efm) from each well The ground wale <br /> i <br /> s pumping system manifold was desigr•.ed using a maximum flow rate of 3 gallons per minute (gam <br /> € from each pumping well for a total maximum flaw of approximately IS gpm. If additional of-site <br /> wells become necessary,the manifold system may be extended from either monitoring well MW-7 or <br /> 4 MW-9 with minimal impact to existing station operations. <br /> Interim Free Product Skimmin and Recove <br /> ry <br /> Or.December 12, 1939,the hydrogeologic investigation revealed approximately 4.5 feet of free product <br /> in monitoring well MW-2- Weekly bailing of fres product from monitoring well MW-2 did not reduce <br /> the product thickness, indicating that an automatic product skimming system was warranted. An air- <br /> operated bladder pump coupled to a floating product skimmer has been installed in monitoring weC <br /> : .. MW-Z. Air is supplied to the skimming pump through the compressed air manifold system, and the <br /> free product is routed to drums located at the remedial equipment area through the water manifo?d <br /> piping system The product storage drums are underlain by ad ub e containment system and the <br /> storage drums are equipped with a tank full shutoff to shut off the air compressor supply to the pump <br /> if the drum u full. A detailed layout of the remedial equipment area showing the location of the <br /> product storage drums and also the air compressor is presented in Figure Z To provide electric power, <br /> for the air compressor and also for future remedial :quipment installation, a 200-amp temporary <br /> --, electrical service was installed. The electrical panel installation details are presented in Figure 3. <br /> Temporary electric power should be on-lino.by Friday,Apel 13,1990,and automatic operation of the <br /> Product skimming system will commence on that date. <br /> r ' Product DispMal <br /> Recovered product will be pumped from the storage drums at the site, as warranted, by Crosby and <br /> Overton and transported to the Shell Refinery in 'Martinet, California,for recycling. <br /> Site tllcaltorl� <br /> The product skimming system will be checked at a r,tinimum) on a weekly basis for the parameters <br /> out[pnrd on the site monitoring 8n ma;n;enance farm included in Appendix B. Free product <br /> shimming, will continue until product is no longer ap,;rarent in monitoring well MW-2 or until the <br /> final, remedial system is installed. <br /> Schedule <br /> Tlie followiing work is currently in progress at the site: <br /> + Right-of-Entry is being pursued to allow monitoring well installation off site to define the <br /> do%%mgradient extent of the dissolved hydrocarbon and also the free product plume. <br /> rA <br />