---
kind: "section"
citation: "40 C.F.R. § 258.56"
title: "40"
number: "258.56"
heading: "Assessment of corrective measures."
url: "https://uscodex.org/cfr/40/258.56"
---

# §258.56. Assessment of corrective measures.

- (a) Within 90 days of finding that any of the constituents listed in appendix II to this part have been detected at a statistically significant level exceeding the ground-water protection standards defined under § [258.55 (h)](/cfr/40/258.55.md?p=h) or [(i)](/cfr/40/258.55.md?p=i) of this part, the owner or operator must initiate an assessment of corrective measures. Such an assessment must be completed within a reasonable period of time.
- (b) The owner or operator must continue to monitor in accordance with the assessment monitoring program as specified in [§ 258.55](/cfr/40/258.55.md).
- (c) The assessment shall include an analysis of the effectiveness of potential corrective measures in meeting all of the requirements and objectives of the remedy as described under [§ 258.57](/cfr/40/258.57.md), addressing at least the following:
  - (1) The performance, reliability, ease of implementation, and potential impacts of appropriate potential remedies, including safety impacts, cross-media impacts, and control of exposure to any residual contamination;
  - (2) The time required to begin and complete the remedy;
  - (3) The costs of remedy implementation; and
  - (4) The institutional requirements such as State or local permit requirements or other environmental or public health requirements that may substantially affect implementation of the remedy(s).
- (d) The owner or operator must discuss the results of the corrective measures assessment, prior to the selection of remedy, in a public meeting with interested and affected parties.

## Notes

### Authority

Authority: 33 U.S.C. 1345(d) and (e); 42 U.S.C. 6902(a), 6907, 6912(a), 6944, 6945(c) and 6949a(c), 6981(a).

### Source

Source: 56 FR 51016, Oct. 9, 1991, unless otherwise noted.