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A conceptual design was prepared for the excavatiodredisposal remedial action in order to support the development of detailed plans and specifications. The conceptual design included all elements ofthe design upon which the cost estimates used in the cost-effectiveness evaluation were based. DETAILED DESIGNPreparation of detailed plans and specifications for the McColl remedial action included development of two bid packages. The first was for site preparation activities including the installation of utilities, grading, fencing, construction of roads, and vehicle weighing and washdown facilities. The second bid package included air emission control and treatment systems, water and electrical utilities, excavation of contaminated soils and hazardous wastes, transportation and redisposal of excavated materials, and site work and demolition required for final clo-Ann E. St. Clair is a Senior Geologist iiiid Ilepiirtiiient Head at Riidiiiii Corporatioil. She eiiriietl her B.A. in Geology from Trinity University iintl X.I.A. iii Geological Sciences froiii The University of Texas at Austin. She has over ten yeiirs experience in evaluation of eiivironiiieiital impwts of energy iuitl iiitlustrial develo iiieiit and waste disposal. 111 recent years, she has &ected a variety oflarge proviiiiis in the hazardous waste iireii aiirietl at he finit ion of prolileiiis auic~ selecting remecIiat ineiisures. She is ;in AIPG Certified Professional Geological Scientist and ii nieml)er of the Ground Water Techiiolo&y Division of the National Water Well Association.sure. Proposers were also required to submit safety and transportation plans. The selection process for remedial action contractor is expected to be completed in mid-1984. CONCLUSIONSThe approach to feasibility study and design of remedial action at uncontrolled hazardous waste sites outlined in National Contingency Plan is very valuable in selecting iind designing the cost-effective alternative. The thorough and systematic application of this approach for remedial action at the McColl Superfund site in California resulted in recommending the cost-effective alternative to the California Department of Health Services. The case study also demonstrated the need for involvement of a variety of technical disciplines in defining the problem, evaluating numerous complex technologies, developing and evaluating alternatives, testing (field and laboratory) for detailed evaluation, and designing the cost-effective remedial action. Kishore T. Ajmera, P.E. is a Senior Civil Engineer at Hatliiin Corporiction, i u i d earned his B.S.C.E. ;it Pooiia University, India, a i d his M.S.C.E. ;it the University of Texas at Arlington. He has Over seventeen years of experience in environmental consulting ant1 construction iiiaiiiigement. He hits worked 110th in private and goveriiiiient ;rnd recent emphasis of his work at Rotlimi has Iieeii in solid antl hazardous wiste iiiaiiiigemetit. Prior to joiiiiiig Radian in 1981, he was ti Senior Project Engineer for the Texas Depsrtiiieiit of Health aiitl ...