Kansas Location Emily Smart Contact Service Lines Site Assessment & Brownfields Redevelopment Due Diligence Project Summary Blackstone Environmental, Inc. conducted a Phase II Brownfields Targeted Assessment (BTA) project as a team with Golder Associates of Denver, Colorado, who are the primary contractor under a state contract with KDHE. The Site is a national historic landmark associated with the Brown vs. Board of Education court case. A Phase I of the Site found a recognized environmental condition (REC) for potential petroleum contamination associated with a former 2,000 gallon underground storage tank (UST) used to heat the school. The actual location of the tank was unknown, but it thought to be located inside of the building basement. Services provided by Blackstone included: Services Provided Conducting a pre-mobilization Site visit with KDHE and the local neighborhood association representative to help determine where the former tank may have been located;Developing a work plan, quality assurance project plan (QAPP), and health and safety plan (HASP) for soil and groundwater sampling;Completing…
Kansas Location Rowley Tedlock Contact Service Lines Due Diligence Site Assessment & Brownfields Redevlopment Project Summary Blackstone Environmental was retained to perform an environmental evaluation of a decommissioned metal plating facility. Intrusive sampling and testing revealed hexavalent chromium impact to soil, with a minor component of volatile organic carbon (trichloroethylene) impact to soil. Blackstone conducted additional exploration to evaluate the extent of impact and to characterize site hydrogeology. Potential viable remediation strategies were evaluated through bench and pilot-scale testing. Services Provided Contaminant investigation and hydrogeological characterizationEnrollment of the site in the Kansas Voluntary Cleanup ProgramBench-scale testing for in-situ chemical fixation with calcium polysulfideImplemented pilot-scale testing as an Interim Remedial Measure (IRM) Results The depth of the impact limited the ability to physically remove contaminated media for treatment. The selected remedial alternative involved in-situ chemical fixation by amending impacted soil with calcium polysulfide which would reduce the very mobile and toxic hexavalent form of chromium to the stable, much less toxic trivalent chromium. The in-situ chemical…
