Efficiency factors - parallel conduit runs

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Location
Vancouver
Occupation
Electrical contractor
Does anyone use a template or a guide of sort they use when quoting multiple runs of conduit either surface mount or below grade? I am quoting 8 tenant warehouse distribution centers all underground feed with 3" PVC under new slab. Farthest is 500' away and closest is 40' from main distribution panel and will be one trench with duct spacers. I use the Neca cost guide as a base and then tweak the numbers after if i feel they are either high or low
 
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