; (iv) require sampling at all drinking water taps in all schools served by the public water system; and (v) require the sampling methodology to be scientifically based; and (C) develop instructions for compliance with such protocol for dissemination to public water systems and customers thereof. (c) Action level exceeded (1) Investigations The Administrator (or the State exercising primary enforcement responsibility) shall require on-site investigations on where the source of lead is for all individual samples with a lead or copper concentration above the action level— (A) to be completed by the public water system or local health department within 10 business days of the sample result; and (B) to include additional samples at additional locations to identify the potential scope of elevated lead or copper levels. (2) Notification Whenever a public water system detects a lead or copper concentration level above the action level, the system shall— (A) within 2 calendar days of detecting such an exceedance that is specific to one or more facilities, notify the persons at such facilities; and (B) within 10 calendar days of completion of sampling for a monitoring period applicable under section 141.86 of title 40, Code of Federal Regulations (or any successor regulation), make a report on any exceedance detected pursuant to such sampling publicly available. (d) Public education The lead and copper rule shall require testing results— (1) to be in a standardized format; (2) to be posted on the website of the Administrator, the State exercising primary enforcement responsibility, and the public water system; and (3) to include— (A) the provisions of consumer confidence reports under section 1414(c)(4) relating to lead and copper; (B) reports under subsection (b)(2) on the results of sampling; (C) lead service line replacement materials and financial assistance forms