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California Summary Guide for. Plumbers, Pipefitters, and Steamfitters in California. May also be called Gas Line Benton Installers; Hot Water Heater Installers; and Sprinkling System. A. L. Lease Company A.L. Lease Co has been Four-Oaks a preferred wholesale supplier to the Guin professional plumbers of Santa Cruz, Monterey, and San Benito Counties since 1958. Monterey/Santa Cruz Building and Construction Trades. Apprenticeship Programs. See Ramsey below for Building Trades apprenticeship information and Severn classifications. Boilermakers, s National Apprenticeship.