Yanchep Rail Extension contractors hope to use land near the future Alkimos station to screen sand.

NEWest Alliance wants to operate a sand screening facility in an existing material stockpile east of Marmion Avenue.

The Department of Water and Environmental Regulation invited submissions on the application until June 25 via der.wa.gov.au.

Documents lodged with DWER said the stockpile would be for material excavated from the rail cutting in the first 7.3km stage from Butler to Eglinton.

The application said the cutting would range from about 5m below the surrounding ground level to 20m deep through a sand dune in one section.

It said the stockpile would be about 4m high and the 20ha site would hold hold about 600,000 cubic metres of material.

Yanchep Rail Extension site in Alkimos. Credit: Community NewsThe noise assessment said proposed operating hours would be during the daytime, between 7am and 7pm on weekdays and Saturdays.

Metronet announced this month that automated boom gates would control traffic on Pipidinny Road, with the speed limit reduced from 80km/h to 40km/h.

It still plans to close the road later this year, with a date for the proposed nine-month closure yet to be confirmed.