Alachlor Chloroacetanilide RUP Tank Selection

Alachlor Chloroacetanilide Preemergence Herbicide — Bulk Tank Selection at Ag-Retailer Distribution, Custom-Applicator Operations, Restricted-Use-Pesticide Compliance, and Row-Crop Production Agriculture

Alachlor (CAS 15972-60-8; trade names Lasso historical Monsanto + post-patent generic Microtech + Partner + Intrro + several house-label suppliers) is a chloroacetanilide-class selective preemergence herbicide registered at U.S. corn, soybean, peanut, and a small subset of vegetable + ornamental nursery production for control of annual grasses (foxtail species; barnyardgrass; fall panicum; crabgrass; signalgrass; goosegrass), small-seeded broadleaves (pigweed; lambsquarters; nightshade; carpetweed; galinsoga), and yellow nutsedge. The active ingredient is supplied at 4-lb-a.i./gal microencapsulated suspension or emulsifiable concentrate at typical commercial formulation. Application timing is preplant-incorporated, preemergence-surface, or early-postemergence at 1.5-4.0 quarts per acre depending on soil texture + organic matter + crop tolerance; alachlor is federally classified as a Restricted Use Pesticide (RUP) at the EPA FIFRA Section 3 registration framework based on groundwater + carcinogenic-classification history.

U.S. alachlor consumption peaked in the 1980s-1990s prior to the introduction of S-metolachlor, atrazine + acetochlor + dimethenamid alternatives, and post-patent reformulation to lower-rate active ingredients; current 2020s alachlor consumption is residual at specific vegetable + peanut + ornamental nursery use plus EU export restrictions limiting global supply. Active U.S. registrants include Drexel Chemical (Memphis TN microencapsulated formulation), Albaugh, and a small set of post-patent specialty registrants. Bulk technical material is shipped at 2,500-gallon stainless tote + 250-gallon shuttle + 30-gallon drum + 2.5-gallon jug to U.S. ag-retailer + farmer-cooperative + custom-applicator stocking points where Restricted Use Pesticide handling protocols apply. Storage envelope at ag-retail + co-op: 4-lb-a.i./gal alachlor formulated product is buffered at HDPE atmospheric tank in the 500-3,000 gallon range serving spring-season custom-applicator dispensing + farmer pickup + field-tender reload at certified-applicator-only handling.

The eight sections below cite EPA FIFRA Restricted Use Pesticide framework, Federal Insecticide Fungicide and Rodenticide Act 7 USC 136 et seq. labeling and tolerance compliance, EPA OPP Reregistration Eligibility Decision (RED) for alachlor and the alachlor stewardship program, OSHA Worker Protection Standard 40 CFR Part 170, EPA Pesticide Container Containment Rule 40 CFR Part 165 Subpart E, ASABE / ASAE S472 + S327 sprayer-calibration and application standards, EPA Endangered Species Act Bulletins Live framework, state-DEP groundwater-monitoring programs (Wisconsin, Iowa, Minnesota, Nebraska, Kansas, plus Atlantic Coastal Plain states), USDA NRCS conservation-practice standards, ASTM D6692 + D6754 polyethylene tank specifications, and routine operating practice at North American ag-retail + co-op + custom-applicator alachlor handling.

1. Material Compatibility Matrix

Formulated alachlor 4-lb-a.i./gal product is a brown-amber emulsifiable concentrate or oil-in-water microencapsulated suspension at pH 5.5-7.0, containing the active ingredient plus aromatic petroleum solvent + nonionic emulsifier surfactant + antifreeze + antifoam at typical formulation; the microencapsulated form (Microtech generation) reduces operator exposure but otherwise has comparable material-compatibility behavior. The petroleum solvent + emulsifier package is the dominant material-compatibility driver at HDPE storage.

The dominant industrial pattern at North American ag-retailer + farmer-cooperative + custom-applicator alachlor storage is HDPE rotomolded vertical atmospheric tank in the 500-3,000 gallon range with CPVC + Viton + PTFE wetted plumbing + stainless-steel fittings + air-operated diaphragm transfer pump, locked at certified-applicator-only access per Restricted Use Pesticide framework. OneSource Plastics' 5-brand HDPE network (Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, Bushman) is the standard atmospheric storage platform at ag-retail + co-op chloroacetanilide herbicide distribution.

2. Real-World Industrial Use Cases

Ag-Retailer + Cooperative RUP Stocking and Mini-Bulk Loadout. Independent ag-retailers (Helena Agri-Enterprises, Wilbur-Ellis, Nutrien Ag Solutions, Simplot Grower Solutions, GROWMARK FS member cooperatives, CHS Inc., Land O'Lakes Truterra/WinField United, plus regional co-ops) operate Restricted Use Pesticide stocking facilities receiving bulk + mini-bulk + tote alachlor at 500-3,000 gallon HDPE atmospheric tank, dispensing to certified-applicator-only mini-bulk tote + 30-gallon drum via metering pump + closed-system handling per EPA Pesticide Container Containment Rule + state-DOA RUP record-keeping requirements.

Custom-Applicator Spring-Season RUP Operations. Custom application services (corn-belt + peanut-belt + soybean-belt regional applicator networks) maintain 500-2,000 gallon HDPE day-tank stocking alachlor at primary custom-applicator branch under certified-applicator authority + state-DOA RUP licensing. Spring application window (March-June) drives volume; alachlor remains in custom-applicator portfolio at niche use-pattern + groundwater-vulnerable-area exclusions remaining label-compliant.

Peanut + Specialty-Crop Production. Alachlor remains a label-active herbicide at U.S. peanut production (Georgia, Florida, Alabama, North Carolina, South Carolina, Texas, Oklahoma, Virginia) for preemergence grass control; peanut-belt ag-retail + co-op stocking is concentrated at southeastern U.S. distribution at 500-2,000 gallon HDPE bulk tank scale serving peanut-grower spring-season application.

Vegetable + Ornamental Nursery Production. Specialty preemergence alachlor application at certain vegetable (snap bean, lima bean) + ornamental container nursery production relies on smaller-scale tote + 30-gallon drum stocking at regional vegetable-belt + nursery ag-retail + specialty distributor; HDPE 250-1,000 gallon vertical tank at certified-applicator service.

Bulk Pesticide Storage Facility RUP Compliance. Bulk pesticide storage with RUP product (typically >500 gallons aggregate) triggers state-DOA Restricted Use Pesticide certification + record-keeping requirements (purchase logs, sale logs, application records, lot-traceability) imposed under state RUP-dealer license; HDPE atmospheric storage with engineered HDPE secondary-containment pan + certified-applicator-only access + lock-and-tag at fill + dispense stations is the dominant compliance solution.

EPA Stewardship Program Field Mixing-Loading Pad. Alachlor stewardship program guidance recommends concrete + HDPE-lined mixing-loading pad at high-throughput application sites with sump-collection + spill-containment + closed-loop rinsate-management to prevent point-source loss to soil + groundwater. HDPE pad-liner + sump tank + rinsate holding tank are the standard compliance package.

3. Regulatory Framework

EPA FIFRA Restricted Use Pesticide. Alachlor is federally classified as a Restricted Use Pesticide under FIFRA 7 USC 136(d) at the EPA Section 3 registration; only certified applicators (private-applicator certification at farmer-grower or commercial-applicator certification at custom-applicator + ag-retailer staff) may purchase, mix, apply, or supervise application. State-DOA RUP-dealer license is required at retail-distribution; state-DOA certified-applicator records (purchase log, application log, restricted-entry interval documentation) are required at use.

EPA OPP RED + Stewardship Program. EPA Office of Pesticide Programs published the alachlor Reregistration Eligibility Decision (RED) in 1998 with subsequent supplements addressing groundwater-detection-driven use limitations + worker-exposure mitigation + microencapsulated formulation transition. EPA + registrant operate an industry stewardship program addressing groundwater detection of alachlor + the alachlor metabolite ESA (ethanesulfonic acid) at vulnerable aquifers across U.S. corn-belt + peanut-belt + Atlantic-Coastal-Plain geography.

40 CFR Part 165 Pesticide Container Containment Rule. EPA's bulk-pesticide-storage rule applies in full to alachlor RUP bulk + mini-bulk storage at 500-gallon-aggregate threshold, with secondary-containment + impervious-pad + spill-response + record-keeping requirements identical to non-RUP pesticide storage but with additional RUP-specific certified-applicator-only-access + lock-out + tag-out at the fill + dispense stations.

OSHA Worker Protection Standard 40 CFR Part 170. Reentry interval at treated fields is 12 hours under standard application; protective-equipment requirements at handler include long-sleeve shirt + long pants + chemical-resistant gloves (Viton, butyl, or PTFE) + chemical-splash goggles + closed-toe footwear + chemical-resistant apron + chemical-resistant headgear at mixing-loading + open-system handling. WPS posting + hazard communication + worker training are required at agricultural establishments.

EPA Endangered Species Act Bulletins Live. Alachlor application is subject to county-by-county Endangered Species Act use limitations published at EPA's Bulletins Live! Two system; applicators are required to consult Bulletins Live! at point of application for active geographic restrictions protecting listed aquatic + terrestrial species.

State Groundwater-Protection-Area Restrictions. Wisconsin Atrazine + Alachlor Prohibition Areas (DATCP ATCP 30) prohibit alachlor application at designated groundwater-vulnerable counties; certain Iowa karst counties + Nebraska + Kansas + Minnesota groundwater-protection-area maps impose application-rate-reduction or seasonal-window restrictions at high-detection sub-basins.

USDA NRCS 595 Pest Management Conservation Practice. Federal cost-share + crop-insurance benefits at NRCS Conservation Practice Code 595 Pest Management Conservation System encourage IPM-based alachlor reduction with reduced-rate + banded + post-emergent + biological-alternative practices.

4. Storage System Specification

Bulk-Storage Tank. Alachlor 4-lb-a.i./gal formulated product bulk storage at HDPE rotomolded 500-3,000 gallon scale: standard HDPE resin per ASTM D1248 specification; vertical flat-bottom or conical-bottom vessel; 4-inch ANSI flanged top fill or 3-inch threaded top at smaller sizes; 3-inch flanged bottom outlet with PVC or CPVC ball valve; atmospheric vent with insect-screen + dust-cover; 18-24-inch top manway for inspection + cleaning access; ultrasonic or radar level transmitter with high-high alarm + low-low alarm; sample valve at 12 inches above bottom outlet for QC sampling; HDPE bulkhead fittings at all penetrations rated for 1.05-1.10 SG (alachlor 4-lb formulation approx 1.07 SG) and 100 deg F maximum service temperature; UV-stabilized exterior + UV-resistant cap at outdoor installations.

RUP Access Control + Lock-Out. Restricted Use Pesticide bulk storage requires controlled access per state-DOA + 40 CFR Part 165 + EPA stewardship framework: locked storage building or secured fence-and-gate enclosure at outdoor installation; certified-applicator-only key + digital-access control at fill + dispense valve; tamper-evident seal at delivery receipt + after-hours lockout. HDPE tank fill-cap and bottom-outlet ball-valve lock-out hasps are standard RUP-compliance accessories.

Secondary Containment per 40 CFR Part 165. Bulk + mini-bulk pesticide storage at 500-gallon aggregate threshold requires impervious secondary containment with capacity equal to 110% of largest single vessel. HDPE secondary-containment pan, concrete-bermed pad with chemical-resistant coating, or steel-framed concrete-walled containment basin are standard. Drainage connection requires positive isolation valve + lockable manual-only drain.

Closed-Transfer System. EPA closed-system transfer requirements at refillable-container service eliminate operator exposure during transfer; HDPE bulk tank dispenses through dry-disconnect coupler (Banjo Corp dry-disconnect, Dixon DC-Series) to certified-applicator-only mini-bulk tote + sprayer-tender via metering pump; air-operated diaphragm pump (Wilden M4, SandPiper, Yamada) at 8-25 gpm transfer rate.

Heat-Tracing + Freeze-Protection. Alachlor formulation viscosity rises and emulsion stability degrades below 32 deg F; northern installations require heated + insulated storage building or heat-traced + insulated bulk tank to maintain product stability through winter dormant storage. Self-regulating electric heat-trace cable + 2-inch closed-cell polyurethane insulation is the standard cold-weather package.

5. Field Handling Reality

Handler PPE. Mixer-loader-applicator PPE per alachlor product label: long-sleeve shirt + long pants + chemical-resistant gloves (Viton, butyl, or PTFE; do not use EPDM or natural rubber) + chemical-splash goggles + closed-toe footwear + chemical-resistant apron + chemical-resistant headgear at mixing-loading. Closed-system handling per WPS engineering-control reduces PPE; certain microencapsulated formulations specify reduced PPE at sealed-system transfer.

Tank-Truck Receipt + Mini-Bulk Transfer. Bulk alachlor delivery is by 5,500-7,000 gallon DOT-406 stainless tanker at large ag-retailer; smaller volume by 1,000-2,500 gallon mini-bulk tote at typical mid-size + small ag-retail receiving. Tanker offload via plant-side air-operated diaphragm transfer pump at 25-100 gpm; transfer pipe is 2-3 inch CPVC or stainless + camlock or dry-disconnect + certified-applicator manual ball-valve isolation. Driver continuous attendance per DOT 49 CFR 177.834 + state-DOA RUP receipt-record protocol.

Sampling + Quality Control. Each tanker delivery requires sample collection at receipt for internal QC + supplier-COA verification: active ingredient content by HPLC, water content by Karl Fischer, pH at 1% aqueous, density at 20 deg C by hydrometer, color + clarity + emulsion stability. Records retained 2-3 years for state-DOA RUP audit.

Spill Response. Alachlor is FIFRA-regulated environmental-hazard product + RUP. Spill response: contain to floor + secondary containment, sweep liquid via wet-vac or absorbent pad + sock to HDPE drum, neutralize residual via large-volume rinse to closed-loop holding tank for licensed disposal at hazardous-waste-treatment-storage-disposal facility (Clean Earth, Veolia, Heritage, Stericycle). State DEP + EPA National Response Center notification at any spill exceeding RQ (100 lb alachlor per CERCLA); state-DOA notification at any RUP incident-of-concern.

Tank Cleaning + Inspection. Annual tank inspection per facility 40 CFR Part 165 + state-DOA RUP framework: drain to recovery tank, triple-rinse with potable water + ammonia or alkaline cleaner, neutralize rinse waste at on-site holding for licensed disposal, inspect interior for residue + crystallization at fill-line + outlet, refill at next campaign. Confined-space entry per OSHA 29 CFR 1910.146 with atmospheric monitoring + supplied-air respiratory protection at any internal inspection.

Compatibility with Other RUP Storage. Alachlor RUP storage should NOT be co-located with strong oxidizers, strong acids, or strong bases at adjacent secondary containment. Dedicated chloroacetanilide RUP storage at separate containment + clear RUP labeling prevents cross-contamination + worker confusion + state-DOA-audit compliance findings.

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