Plans to store 13,000 tons of dirt on a 15-acre site on the south side of Lucent Drive in Alpharetta were delayed again Monday after the City Council could not reach agreement on the environmental and aesthetic impact of the project.

Council members voted to table the request by Duke Realty until they were sure the site was secure from erosion and would not present an eyesore to adjacent properties.

The applicant is seeking the variance to ease construction of a 67,842-square-foot medical office building on a nearby site.