Design a winter-maintenance documentation practice for a commercial snow contractor's crews, informed by the specific record-keeping requirements NH's enacted law imposes (and MN's still-pending proposal would impose).

Steps

1. Base the practice on NH RSA 508:22, II's actual enacted requirement: type/quantity of deicer used, treatment dates, and weather conditions for each de-icing event, retained 3 years
2. Note Minnesota's introduced-but-not-enacted HF820/HF2908 language would require similar records (plus proof of an annual usage report) retained 6 years if it were ever passed — present this as a proposal, not a current requirement
3. Recommend documenting per-site, per-event records regardless of jurisdiction, since courts can weigh documented practices in a negligence defense even without a statutory liability shield
4. Include timestamped weather-condition data (e.g., from a paired NWS alerts or point-forecast check) alongside material-application logs
5. Set a retention policy that meets the strictest applicable jurisdiction's requirement (currently NH's 3 years) if the contractor operates across state lines