KTA Construction on Tavern Road in Alpine holds multiple CSLB licenses including #398284 (General Engineering) with A-2 Highways, A-7 Excavating and Grading, A-12 Trenching and Surfacing, A-15 Sewers, Drains and Pipes, and A-19 Pipeline and Conduits classifications, operating since 1995. Sewer-main tie-ins and lateral connections routed through McGuire Plumbing Inc. follow the pipeline installation and backfill sequence, with connection depth and invert elevations verified by laser survey before the plumbing crew makes final joints. An AGC San Diego member with 20 to 50 field personnel, the firm executes municipal and private-development projects spanning water-main installation, sanitary-sewer trunk construction, storm-drain systems, and roadway grading across San Diego County. Tree and root-mass clearing by Bob Wining Tree Service on undeveloped Alpine parcels precedes trenching operations, with stump removal depth matched to the pipeline invert elevation shown on the approved improvement plans. The fleet supports directional boring under existing roadway improvements, open-cut pipeline installation at depths exceeding 20 feet in Class III and Class IV soils, and compaction testing to 95 percent relative density per ASTM D1557 modified Proctor standards.