| Total requests for Mar 2012: 6,813 |
| Unique requests | Total requests | Query | Documents returned |
| 33 | 41 | CERCLA | 18,541 |
| 24 | 37 | love canal | 8,231 |
| 23 | 28 | SARA | 4,570 |
| 22 | 25 | sara title III | 4,457 |
| 21 | 24 | RCRA | 15,163 |
| 19 | 26 | superfund site | 13,214 |
| 18 | 31 | NPL | 12,361 |
| 15 | 18 | superfund | 18,056 |
| 14 | 23 | HRS | 17,962 |
| 14 | 15 | EPCRA | 11,045 |
| 13 | 16 | Koppers | 181 |
| 13 | 15 | florida | 1,164 |
| 13 | 14 | funding | 8,789 |
| 12 | 23 | Falmouth | 7,766 |
| 12 | 20 | arar | 14,494 |
| 11 | 42 | PCB's | 19,474 |
| 11 | 17 | targeted risk level | 28,382 |
| 11 | 14 | regional | 1,755 |
| 10 | 24 | new hampshire | 20,303 |
| 10 | 12 | hazard ranking system | 10,115 |
| 9 | 13 | CERCLA Hazardous Substance | 38,739 |
| 9 | 12 | cerclis | 8,333 |
| 9 | 12 | Superfund for kids | 15,817 |
| 9 | 12 | Remedy | 10,310 |
| 9 | 11 | reportable quantities | 8,155 |
| 9 | 10 | risk assessment | 20,774 |
| 9 | 10 | georgia | 11,132 |
| 8 | 26 | nyd980532014 | 14,078 |
| 8 | 25 | NCP | 15,544 |
| 8 | 19 | TSCA | 19,415 |
| 8 | 18 | PRP | 12,415 |
| 8 | 13 | palmerton | 14,584 |
| 8 | 11 | Hazard Quotient | 24,251 |
| 8 | 8 | landfill | 3,013 |
| 7 | 15 | brownfields | 973 |
| 7 | 12 | glossary | 8,176 |
| 7 | 10 | responsiveness summary | 12,175 |
| 7 | 10 | remedial investigation | 29,033 |
| 7 | 10 | Virginia | 20,165 |
| 7 | 10 | Removal Action | 10,236 |
| 7 | 9 | natural resources damages | 14,429 |
| 7 | 9 | lead | 12,012 |
| 7 | 9 | QAPP | 24,585 |
| 7 | 8 | section 313 | 955 |
| 7 | 7 | mercury | 1,395 |
| 7 | 7 | hazardous waste | 3,820 |
| 7 | 7 | epa - 600 2- 85 104 | 14,502 |
| 7 | 7 | Ohio | 1,414 |
| 7 | 7 | National Priorities List | 20,065 |
| 6 | 16 | initial remedial measures | 36,481 |
| 6 | 14 | hazard index | 34,007 |
| 6 | 11 | contamination | 20,474 |
| 6 | 11 | Woburn Massachusetts | 9,284 |
| 6 | 11 | Toluene | 15,449 |
| 6 | 9 | radioactive waste | 1,002 |
| 6 | 8 | top hazardous substances | 25,412 |
| 6 | 8 | cleanup level | 26,656 |
| 6 | 7 | iowa | 14,712 |
| 6 | 7 | bioremediation | 2,598 |
| 6 | 7 | TRI | 38,610 |
| 6 | 6 | mining\ | 17,836 |
| 6 | 6 | NJD006973234 | 0 |
| 5 | 21 | hazardous chemical | 7,024 |
| 5 | 12 | hazard ranking system HRS | 1,135 |
| 5 | 10 | list of lists | 31,204 |
| 5 | 10 | Pesticides | 28,715 |
| 5 | 9 | Soil Screening | 33,612 |
| 5 | 9 | OSWER Directive 9355.3-20 | 19,148 |
| 5 | 8 | work plan | 34,396 |
| 5 | 8 | rq | 23,057 |
| 5 | 8 | eeca | 12,539 |
| 5 | 8 | Michigan | 1,641 |
| 5 | 7 | mercury contamination | 15,584 |
| 5 | 7 | Gowanus canal | 13,348 |
| 5 | 7 | Ecological Risk Assessment | 15,315 |
| 5 | 6 | woburn | 53 |
| 5 | 6 | tce | 16,079 |
| 5 | 5 | pump treat | 1,742 |
| 5 | 5 | institutional controls | 1,984 |
| 5 | 5 | hazardous material | 3,862 |
| 4 | 22 | OSHA | 14,187 |
| 4 | 11 | North Carolina | 21,300 |
| 4 | 9 | chlordane | 704 |
| 4 | 8 | velsicol | 1,737 |
| 4 | 8 | phytoremediation | 236 |
| 4 | 8 | dioxin | 26,420 |
| 4 | 8 | diffusion coefficient Henrys constant table | 25,961 |
| 4 | 7 | who funds the superfund clean-up program | 12,904 |
| 4 | 7 | irm | 13,153 |
| 4 | 7 | health effects of PCBs | 27,917 |
| 4 | 7 | groundwater | 15,864 |
| 4 | 7 | TXD980696553 | 25,113 |
| 4 | 7 | South carolina | 1,144 |
| 4 | 6 | scoping | 16,000 |
| 4 | 6 | new york | 15,236 |
| 4 | 6 | lepc | 12,030 |
| 4 | 6 | esa | 15,496 |
| 4 | 6 | New jersey | 16,965 |
| 4 | 6 | Clean Water Act | 20,450 |
| 4 | 6 | ABC's of superfund | 1,699 |
| 4 | 5 | toxic waste | 18,802 |
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