Ace Demolition Services Ltd had been contracted by Southend Borough Council to demolish Futures Community College, in Southchurch Boulevard, Southend-on-Sea.
Shannon Brasier, who was 20 years old at the time, was working with a colleague to load a fuel hose into the rear compartment of a 21-tonne excavator, when the excavator moved round and crushed her between the excavator and a mobile fuel tank.
Brasier, from Dagenham, suffered life-changing injuries, including to her neck, skull and face, which she was fortunate to survive.
An HSE investigation found that Ace Demolition Services Ltd failed to implement suitable controls to segregate pedestrians and construction plant, allowed two pairs of keys to be used during the refuelling process and allowed operatives to act as signallers/banksman for the excavator without having received adequate training.
A director, John Gilligan, was responsible for supervising the refuelling and drove the excavator before the refuelling was complete.
The incident happened on 28 July 2020.
Ace Demolition Services Ltd and John Gilligan, of Chelmsford pleaded guilty to safety breaches.
Ace Demolition Services Ltd was fined £20,000 and ordered to pay costs of £9,731 at Chelmsford Magistrates’ Court while Gilligan was given a 12-month community order with a requirement to undertake 250 hours of unpaid work.
HSE inspector David Tonge said: “This incident could have so easily been avoided. While there were a number of shortfalls, this incident ultimately occurred due a failure to keep the workers away from the excavator.
“Duty holders must ensure that individuals are segregated from vehicles and construction machinery.”