Conterra Inc. in Santee's Prospect Avenue industrial zone installs stormwater containment systems for new and existing commercial construction across the West Coast. Bioswale and bioretention basin installations address California's MS4 stormwater permit requirements on project sites where pre-construction subgrade surveys by Eliminite Termite Services also verify soil conditions before excavation begins. Registered as a federal contractor in SAM.gov since 2016 with CAGE Code 9XFC5, the firm maintains AGC San Diego membership and serves agriculture, municipal water, industrial, oil-and-gas, and renewable energy sectors. Applications include retention and detention basins, catch basins, infiltration ponds, pit liners, and lagoon liners requiring coordinated geosynthetics, earthwork, and concrete placement. Multi-trade commercial builds pair Conterra's below-grade containment scope with above-grade envelope protection from AVL Roofing Inc., delivering full-structure moisture exclusion from foundation slab to parapet cap. Turnkey containment packages involve HDPE geomembrane fusion welding, reinforced concrete bond beams, and engineered infiltration grading certified to California Regional Water Quality Control Board specifications.