37
Construction of buildings, facilities and infrastructure for mines, dams, reservoirs, water treatment plants and facilities that remediate, purify and treat wastewater from mining, oil, gas and mineral extraction; repair and restoration of mines, dams, reservoirs, water treatment plants and facilities that remediate, purify and treat wastewater from mining, oil, gas and mineral extraction; services auxiliary to mines, dams, reservoirs, water treatment plants and facilities that remediate, purify and treat wastewater from mining, oil, gas and mineral extraction, namely, building inspections, reviewing construction plans, and consulting in the field of the construction, repair, and refurbishment of mines, dams, reservoirs, water treatment plants and facilities that remediate, purify and treat wastewater from mining, oil, gas and mineral extraction
40
Water Treatment; treatment of mine wastewater and oil and gas produced waters; custom fabrication of water filters for others, for use in mine, dams, reservoirs, water treatment plants and facilities that remediate, purify and treat wastewater from mining, oil, gas and mineral extraction
42
Engineering, research, analysis, and design related to the construction, maintenance, repair, fabrication and refurbishment of mines, dams, reservoirs, and water treatment plants and facilities that remediate, purify and treat wastewater from mining, oil, gas and mineral extraction; services auxiliary to mines, dams, reservoirs, and water treatment plants, namely the drafting of construction plans
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