two land surveyors at work

beampump big crude drill drilling dual ecology engineering engineers environment equipment experts exploration female field fossil fuel hardhat heavy hivis hiviz horsehead industry instrument jacket jackpump looking machine machinery male measurement measuring men oil oilfield oilindustry oilpump oilwell optical petrol petroleum pipeline pollution professionals pump pumping pumpjack rafinery reflective safety surveyor surveyors team technology texan theodolite tripod two unit vest vis viz well women work working