| Total requests for Mar 2012: 1,212 |
| Unique requests | Total requests | Query | Documents returned |
| 21 | 24 | swmm | 107,790 |
| 15 | 21 | epanet | 100,457 |
| 12 | 23 | EPA600R-93010 | 24,053 |
| 5 | 7 | EPA 6002-81236 | 98,185 |
| 4 | 6 | magement topic | 63,050 |
| 4 | 6 | 600R-10100 | 51,099 |
| 4 | 4 | LID | 98,200 |
| 3 | 4 | software | 92,806 |
| 3 | 4 | epa swmm | 76,499 |
| 3 | 3 | eliminate 99.9 | 96,900 |
| 3 | 3 | EPA 600R-08003 | 99,766 |
| 2 | 14 | coffee maker life cycle | 93,222 |
| 2 | 6 | water purifiers | 81,716 |
| 2 | 6 | EPANET download | 100,450 |
| 2 | 5 | stormwater | 83,199 |
| 2 | 5 | nitrogen removal | 82,680 |
| 2 | 5 | epasens | 119,400 |
| 2 | 5 | WASP | 105,980 |
| 2 | 4 | reduction of cyanide content in ground water quality | 115,925 |
| 2 | 4 | publications | 92,800 |
| 2 | 4 | Volatileganic Compounds VOCs | 77,750 |
| 2 | 3 | water hammer | 111,633 |
| 2 | 3 | nano | 108,200 |
| 2 | 3 | model | 101,133 |
| 2 | 3 | exampl | 72,760 |
| 2 | 3 | efdc | 75,733 |
| 2 | 3 | chlorine | 109,000 |
| 2 | 3 | carbon monoxide | 105,166 |
| 2 | 3 | biodiesel | 110,000 |
| 2 | 3 | VOC | 105,000 |
| 2 | 3 | AERMOD | 119,666 |
| 2 | 2 | sustain | 109,250 |
| 2 | 2 | sta310301.dat | 0 |
| 2 | 2 | sole source aquifer | 110,000 |
| 2 | 2 | sand | 123,500 |
| 2 | 2 | nitrogen | 111,700 |
| 2 | 2 | lead | 105,500 |
| 2 | 2 | download epanet | 107,500 |
| 2 | 2 | aurangabad maharashtra | 97,700 |
| 2 | 2 | arsenic | 114,000 |
| 2 | 2 | air pollution | 104,550 |
| 2 | 2 | acid rain | 112,500 |
| 2 | 2 | Special Issue Fact Sheet 1 | 115,000 |
| 2 | 2 | SWWM | 108,500 |
| 2 | 2 | Pm2.5 | 89,950 |
| 2 | 2 | Monitored Natural Attenuation | 98,400 |
| 2 | 2 | Epanet z | 107,500 |
| 2 | 2 | CARBENDAZIM | 52,438 |
| 2 | 2 | 6251-80-012 | 0 |
| 1 | 12 | CCR title22 section 64533 Chapter 15.5 | 79,994 |
| 1 | 11 | desechos citostaticos | 98,245 |
| 1 | 8 | interfacing SWMM | 86,343 |
| 1 | 7 | household emissions calculator | 112,942 |
| 1 | 7 | Interfacing guide SWMM | 87,228 |
| 1 | 7 | Air Quality | 104,885 |
| 1 | 6 | tO14 voc | 49,666 |
| 1 | 6 | mold testing | 98,916 |
| 1 | 6 | dkdp4eofp431pqd | 126,500 |
| 1 | 5 | stormwater management | 125,600 |
| 1 | 5 | remediation cost modelling | 110,260 |
| 1 | 5 | pollution | 98,680 |
| 1 | 5 | oil spill cleanup | 104,620 |
| 1 | 5 | nox | 78,262 |
| 1 | 5 | monitoring equipment certification | 128,200 |
| 1 | 5 | mike view | 108,320 |
| 1 | 5 | ductwork | 87,280 |
| 1 | 5 | VALLEY | 119,400 |
| 1 | 4 | wastewater treatment using cytostatic hospital | 76,862 |
| 1 | 4 | neurotoxicity guideline | 101,325 |
| 1 | 4 | national primary drinking water Regulations | 97,850 |
| 1 | 4 | groundwater sampling | 114,550 |
| 1 | 4 | formaldehyde | 124,000 |
| 1 | 4 | factores de emision por etanol con gasolina | 82,775 |
| 1 | 4 | case study | 75,525 |
| 1 | 4 | bladder cancer linkto arsenic water | 70,850 |
| 1 | 4 | Water agrochemical vadose environment | 120,750 |
| 1 | 4 | STORET | 98,775 |
| 1 | 4 | PDX | 68,985 |
| 1 | 4 | MRO in Quality Assurance | 92,350 |
| 1 | 4 | Do reclaimed landfill require additional permits once the land has an established business located on it | 82,499 |
| 1 | 3 | waterhammer | 91,133 |
| 1 | 3 | water quality model | 76,066 |
| 1 | 3 | training needs for division managers | 92,866 |
| 1 | 3 | technology transfer | 58,880 |
| 1 | 3 | soil washing | 109,633 |
| 1 | 3 | shapefiles | 103,766 |
| 1 | 3 | sediments heavy metal | 102,133 |
| 1 | 3 | rental assistance | 88,909 |
| 1 | 3 | rain gage data | 71,266 |
| 1 | 3 | pm monitor site selection | 81,800 |
| 1 | 3 | package plant | 69,366 |
| 1 | 3 | nutrient control design | 116,333 |
| 1 | 3 | nunn | 112,000 |
| 1 | 3 | neurotoxicity nanotoxicity | 43,538 |
| 1 | 3 | neurotoxicity nanoparticle | 105,000 |
| 1 | 3 | microbiological contaminants | 74,633 |
| 1 | 3 | line drawings of water distribution systems | 115,100 |
| 1 | 3 | leaking water pipes | 111,200 |
| 1 | 3 | lead removal | 92,600 |
| 1 | 3 | landfill clay caps | 102,766 |
| 1 | 3 | iron contaminated water | 86,700 |