John Kondziolka is a senior environmental engineer at Gradient with a successful record leading projects in contaminant fate and transport, risk assessment, and multimedia site characterization. He uses a variety of analytical and numerical modeling techniques, coupled with statistical analyses, to support technically robust reports and presentations. His expertise has been applied to interstate groundwater resource disputes, risk-based investigation and remediation of Superfund sites, coal combustion residual surface impoundment impact analyses, and green chemistry product assessments for refrigerants in emerging markets.