Bench Sewer District Hydrogen Sulfide Control Station (Underground) - To install fire sprinkler service supply of approximately 20'-0" of 3" ductile iron pipe connected to a 2" Polybutylene line from the property line into a 552 ft/2, Type VN, fully sprinklered hydrogen sulfide control station used for chemical storage. This building is classified as an H-7 for the amount of hazardous materials in storage. Fire sprinklers required by the occupancy classification. Overhead system piping permit is under a separate permit: FIR02-00395. This permit is attached to BLD02-01584.