Keystone flags base instability on Danville tennis courts; contractor offers three repair options and $39,000 full‑rebuild add‑on

Jeffrey Sellers of Keystone Sports Construction told the Danville Area School District Committee of the Whole that seven core samples taken across the high‑school tennis courts show inconsistent asphalt/base depths and evidence of surface failure that could compromise a straightforward mill‑and‑resurface job.

Lede: Keystone — the low bidder for the court work — reported that four of the seven cores, if the contractor mills 3 inches as in the current scope, would leave only about 1.5 to a little more than 2.25 inches of base course in some locations. Heavy paving equipment placed on that shallow base could further destabilize the surface and require additional base remediation, Sellers said.

Nut graf: Keystone offered three options: (1) proceed with the current milling/resurfacing contract but acknowledge a risk and address…