_Chemical walkthrough, drum build by category, one manifest line per category, pack lists one page per drum. Prohibited items flagged under 49 CFR 173.12(b)._ # Walk the stockroom. The drums, the manifest and the bill follow. A lab pack prepares, staffs and closes on the same machinery an event does, plus the two steps only a lab pack has: the walkthrough and the drum build. _Screen: the lab pack walkthrough — chemical, CAS number, state, inner container, quantity, category, codes and shelf location; unknowns waiting on Hazcat; a prohibited item flagged with the reason._ > Walk. Every bottle on the shelf, chemical by chemical. > Pack. By your own categories, checked as you go. > Manifest. One line per drum category. > A drum per category. A manifest per designated facility. However many categories the shelf holds, and wherever the drums are going. The job's manifest count follows from where the drums go — one per designated facility. ## Each drum carries its category, its generic PSN, its codes and its gross weight. - Flammable liquids — **UN1993 Waste flammable liquids, n.o.s., 3, PG II** Fiber drum, vermiculite, gross weight off the scale, codes unioned from the bottles inside — D001, F003. One DOT class per outer. - Corrosive liquids — **UN1760 Waste corrosive liquid, n.o.s., 8, PG II** Inner container size and gross weight are validated against the 173.12(b) limits as you pack. - Oxidizers — **UN1479 Waste oxidizing solid, n.o.s., 5.1, PG II** Category pairs that must not share a drum are flagged — compatibility is handled at the category level. - Toxic liquids — **UN2810 Waste toxic liquid, organic, n.o.s., 6.1, PG II** Your own category list, with its generic proper shipping name, not a vocabulary baked into the software. - Own container — **A poison inhalation hazard never rides in a lab pack.** 49 CFR 173.12(b). Mercovi names it, says why, and ships it as its own container instead of letting it into a drum. ## The drum build, and the manifest lines it becomes. Unknowns waiting on Hazcat stay out of the drums until they are answered. The manifest writes one line per drum category, using the category's generic proper shipping name with the waste codes unioned from everything in that drum. _Screen: the drum build — drums by category with outer packaging, absorbent and gross weight, and the manifest lines each category becomes._ ## New streams start from the regulatory library, not a blank form. When the walkthrough finds a stream you have not shipped before, you pick it from the library and the record fills in: the RCRA codes, the composed DOT shipping description, the EPA management method. You adjust; you do not type a shipping description from memory. _Screen: the waste catalog — one record per stream with its composed DOT shipping description, RCRA codes, cost per measure and designated facility._ ## What the library holds. ### RCRA waste codes (40 CFR 261) EPA's waste codes — the D, F, K, P and U series — picked onto the stream. Any code on the stream makes its manifest a Uniform Hazardous Waste Manifest. On a container the codes are never typed: they are the union of its contents. ### DOT shipping description (49 CFR 172.101) UN/NA number, proper shipping name, hazard class and packing group come from the hazardous materials table. The description is composed from those fields, with "Waste" leading the shipping name while any waste code is on. ### EPA management method The management method code the designated facility will apply, from the same list the manifest prints. ### Lab pack categories Your own categories, each with its generic proper shipping name and the 173.12(b) limits it packs under. ### The rest of the record Designated facility and its approval number, and the cost per measure — 55 DF, 5 GAL, LB, LF — so the drum that leaves the stockroom already knows where it is going and what it costs you. ## What may not ride in a lab pack. 49 CFR 173.12(b) governs lab packs. Mercovi checks these at the drum build. ### Inner container size Validated against the 173.12(b) limit for the inner container as each item is added to a drum. ### Gross weight The gross weight off the scale is validated against the 173.12(b) limit for the outer packaging. ### Prohibited materials Poison inhalation hazard, 6.1 PG I and temperature-controlled materials are flagged with the reason and shipped as their own container. ### Category pairs Category pairs that must not share a drum are flagged. Compatibility is handled at the category level; Mercovi does not claim a chemical-level compatibility matrix. > Source: [49 CFR 173.12](https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-173/subpart-A/section-173.12). ### Unknowns An item waiting on Hazcat is tracked as an unknown and cannot be categorized or packed until it is answered. The count of what is still unknown is on the job record. ### Pack lists and the bill The pack lists print, one page per drum, and download as a single PDF. The bill prices drums by category, per container or per pound, from that client's own table. > The drums, the manifest, the pack lists and the bill all come from the one walkthrough. Your wastes, containers, facilities, management methods, billing methods and limits are yours to edit. No developer ticket to add a facility. ## Asked about lab packs. ### What does a lab pack walkthrough record? For every container seen on the walk: the chemical name, CAS number, physical state, inner container material and size, quantity, hazard class, waste codes, and where on the shelf it was standing. Items waiting on [Hazcat](/glossary#hazcat) are tracked as unknowns rather than blanks. ### What may not go in a lab pack? [49 CFR 173.12(b)](/compliance#labpack) governs lab packs: inner container size limits, gross weight limits, and materials that may never ride in one, such as poison inhalation hazards. Mercovi flags a prohibited item with the reason and ships it separately. Compatibility cautions are at the category level — pairs that must not share a drum are flagged; there is no chemical-level matrix. ### How does a drum become a manifest line? The manifest writes one line per drum category, using the category's [generic proper shipping name](/glossary#generic-psn) with the waste codes unioned from everything in that drum. Drums going to different [designated facilities](/glossary#designated-facility) go on different [manifests](/platform/manifests), so a job can have more than one. ### How is a lab pack billed? Drums are priced by category, per container or per pound, from that client's own table, so the [bill](/platform/billing) follows the drum build rather than being recomputed afterwards. The pack lists print one page per drum and download as a single PDF, and the bill is drafted from the same drums when the job closes, as for an [HHW event](/hhw). Previous: [Commercial & industrial](/commercial-industrial) · Next: [PaintCare](/paintcare) ## See it run a job end to end. Tell us what you run — events, plant pickups, lab packs, a floor — and we'll show you the screens that matter to you. [Book a demo](/demo)