Walden’s team handles every aspect of tank and drum storage compliance from start to finish, meeting our clients’ needs, budget, and timeline. Our extensive experience with aboveground and underground tanks used to store gasoline, diesel, fuel oil, waste oil and processing chemicals includes designing, construction management, permitting, and spill response. We can assist with Department of Building (DOB) permits, County Health Services permits, permit existing tanks, resolve any violations, and/or recommend any compliance upgrades. With our expert team, we can assist in helping you achieve your fueling, chemical supply and storage needs.


  • Tank Compliance and Monitoring
  • AST/UST Permitting
  • Class A/B/C Operator Compliance
  • Chemical/Petroleum Bulk Storage System Design
  • Spill Prevention Control and Countermeasures Plans
  • Storage Tank System Installation and Testing
  • UST/AST Abandonment and Demolition
  • Spill Response
  • Waste Oil Management
  • Construction Management
  • Cost Estimating



Tank As-Builts, Long Island, New York

Walden is currently providing a Long Island facility assistance in registering 28 different Chemical Bulk Storage (CBS) with the Suffolk County Department of Health Services (SDHS). These CBS areas include tanks and various drum storage locations. The facility’s files contained no permit to construct or approved drawings for the CBS areas. Most tanks on site were custom built and Walden was only able to track one of the tanks to a definite manufacturer. read more