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(Click for frequent words.) 54 Dimock Twp 48 PADEP 47 Tranguch 47 Korleski 47 Obleski 47 Marcellus shale drilling 46 Scofieldtown Park 45 Chesapeake Appalachia 45 Gene Yaw 45 spokeswoman Betsy Mallison 44 Lepes Road 44 Sadsbury Township 44 Conestoga Landfill 44 Gardeau 44 Kathy Dahlkemper D 44 DEP 44 Tonawanda Coke 44 Jason Altmire D 43 Scofieldtown 43 Olin Chemical 43 Gasda 43 Lackawanna Luzerne 43 Dimock Pa. 43 Quecreek Mine 43 hydrofracking 42 Marcellus Shale drilling 42 Industri Plex 42 Parkesburg Borough 42 hydro fracking 42 Quecreek mine 42 Kurt Knaus 42 Jiunta 42 Pennsylvania 42 coal ash impoundments 42 Pitzarella 42 West Pikeland 42 Uwchlan Township 42 Swistock 42 trichlorethylene TCE 42 LORCO 42 wells 42 Lumberland 42 Countywide Landfill 42 John Repetz 42 fracking fluids 42 Allen Kukovich 42 Upper Macungie 42 Lower Towamensing 42 Edgmont 42 MCUA 42 fracking fluid 42 Hammonasset River 42 groundwater plume 42 Solobay 41 Neshaminy Creek 41 Myron Arnowitt 41 Meshoppen 41 Wreck Pond 41 Lobins 41 groundwater contamination 41 Cabot Oil 41 tetrachlorethylene PCE 41 vapor intrusion 41 MtBE 41 Ken Komoroski 41 Bushkill Creek 41 polluting groundwater 41 Edgmont Township 41 Millington Quarry 41 Sarah McCoin 41 Scrubgrass 41 polluted groundwater 41 Pat Farnelli 41 Grapeville 41 Edmund Coletta 41 MTBE contamination 41 Spectacle Pond 41 Zosh Road 41 Kiddie Kollege 41 Shohola 41 Keasbey 41 stormwater discharges 41 Harveys Lake 40 Congressman Jason Altmire 40 Perchlorate contamination 40 LMDT 40 Metachem 40 Purecoat 40 East Rockhill 40 Rep. Lou Barletta 40 spokeswoman Freda Tarbell 40 Hilltown Township 40 Carter Carburetor 40 tritium laced 40 landfill leachate 40 Betsy Mallison spokeswoman 40 Todd Snitchler 40 Marjol 40 COGCC 40 Thalhamer 40 Shippingport 40 contaminating groundwater 40 Vintondale 40 TCE contamination 40 Sewage Authority 40 Forge Pond 39 Greg Vitali 39 Tittabawassee River floodplain 39 Whitemarsh Township 39 Shpack 39 Clean Water Action 39 Vilello 39 Susquehanna 39 NHDES 39 deFur 39 Plumsteadville 39 Wind Gap 39 bituminous mines 39 trichloroethene TCE 39 compressor stations 39 Lake Beseck 39 airsheds 39 northcentral Pennsylvania 39 Marcellus shale formation 39 spokeswoman Darlene Yuhas 39 Shieldalloy 39 frack flowback 39 LHR Farms 39 SRBC 39 PennEnvironment 39 contaminates drinking 39 Egyptian Lacquer 39 Sanitary Authority 39 trichlorethylene 39 Fallowfield Township 39 Mayor Joseph Jaskiewicz 39 Trancas PCH 39 Upper Gwynedd Township 39 coal tar sealants 39 hydrofracturing 39 Cochranville 39 Branchport Creek 39 McCullom Lake Village 39 septic systems 39 Antrim Township 39 Anschutz Exploration 39 PSATS 39 Groundwater contamination 39 septics 39 Marcellus shale wells 39 spokeswoman Skylar McElhaney 39 township zoning ordinances 39 trichloroethene 39 Krancer 39 Lycoming 39 Wissahickon Creek 39 Gordner 39 MBTE 39 Johnstown 39 Dinniman 39 contaminated groundwater 39 radium contamination 39 Hanover Twp 39 Mrs. Secor 39 Betsy Mallison 39 PaDEP 39 Hatfield Ferry 39 Edge Moor 39 Terry Maenza 39 wastewater discharges 39 Mike Vereb 39 Ludder 39 Luzerne 39 SGEIS 39 Alcosan 39 Sheremata 39 creosote contamination 39 Chalmette Refining 38 Glenburn Pond 38 Countywide Recycling 38 Gilboa Dam 38 Sen. Lisa Boscola 38 Repetz 38 Countywide landfill 38 Drumore Township 38 Sworen 38 livestock confinements 38 hydro fracturing 38 Clean Streams Law 38 Candori 38 Herculaneum smelter 38 unlined landfills 38 Delaware Inland Bays 38 Quemahoning Reservoir 38 Marcellus wells 38 Chrin Brothers Sanitary Landfill 38 Congresswoman Allyson Schwartz 38 Honey Brook 38 Robin Wiessmann 38 Rep. Thaddeus Kirkland 38 Marcellus shale 38 COAH regulations 38 Mr. Cascino 38 Feddeler 38 Parkesburg 38 Readville 38 OxyChem 38 Lehigh Cement 38 Palos Verdes Shelf 38 Pompton Lake 38 spokesman Farrell Sklerov 38 Rep. Jason Altmire 38 Mr. Alosso 38 Kukovich 38 Tidewater Utilities 38 northeastern Pennsylvania 38 Pottstown Landfill 38 Charlie Dent 38 spokesman Larry Hajna 38 Kathleen Dahlkemper 38 Shannopin 38 contaminants leach 38 beachwater 38 Derry Township 38 UGI Utilities 38 Aberjona River 38 Straban 38 OVEREATERS ANONYMOUS Northeastern 38 CFJMA 38 Irene Kropp 38 Laureldale 37 Matsikoudis 37 pollutes groundwater 37 Lawrence Hajna 37 Moshannon Creek 37 stormwater discharge 37 groundwater 37 Sen. Allen Kukovich 37 Szenher 37 TCE trichlorethylene 37 Lititz 37 wood boilers 37 Tohickon Creek 37 Beech Bottom 37 Michael Krancer 37 raw untreated sewage 37 OEPA 37 Envirotest Systems Corp. 37 tritium contaminated 37 homeowner Angela Iannelli 37 TLRSD 37 Nockamixon 37 Pennsylania 37 met Helga Testorf 37 Katsock 37 Lattimer Mines 37 Shickshinny 37 coal tar sealant 37 Whittaker Bermite 37 Conewago 37 unpermitted discharge 37 Leacock Township 37 Hydrofracking 37 Skippack 37 hydraulically fracture 37 Railroads Pipelines 37 Wyle Labs 37 PCE contamination 37 MAWC 37 ORSANCO 37 Mahanoy Township 37 Dennis Yablonsky secretary 37 Schorpp 37 TCE vapors 37 Ron Ruman 37 Marcellus Shale drillers 37 Edgeboro 37 hydraulic fracturing fluids 37 degreasing solvent 37 Roaring Branch 37 Combe Fill 37 Environmental Protection DEP 37 Hopewell Township 37 Conemaugh River 37 SPRING TOWNSHIP 37 Sluzar 37 Paul Kanjorski 37 Conshohocken 37 Upper Pottsgrove 37 Cibulas 37 Cambria 37 Buckeye Egg 37 Democrat Jason Altmire 37 Environmental Protection PADEP 37 Kolke Creek 37 Caswell Cove 37 Boscola 37 Amerikohl 37 Ambler Borough 37 Trihalomethanes 37 NEORSD 37 DeRensis 37 dichloroethylene 37 spokeswoman Katy Gresh 37 naturally occurring radium 37 Deakos 37 MassDEP Commissioner 37 Groundwater Protection 37 arsenic boron 37 chloramine 37 legalized slots parlors 37 Lynda Rebarchak 37 Mayor Corradino 37 Kathleen McGinty 37 Len Lichvar 37 Occidental Chemical 36 Wendelgass 36 Representative Curt Weldon 36 FRAC Act 36 fracking 36 Coopersburg 36 Gladwyne 36 Ebensburg 36 CCMUA 36 Joe Ferson 36 Asteak 36 McClusky Canal 36 hydraulic fracturing fluid 36 Nanty Glo 36 tailings basin 36 Rep. Ed Staback 36 Superfund Site 36 situ leach mining 36 Wonstolen 36 Jacobsville neighborhood 36 Pepacton Reservoir 36 Scranton Sewer Authority 36 Weissport 36 Cresson Township 36 Dingman Ferry 36 Rustic Mall 36 DuPont DeLisle plant 36 fracing fluids 36 Hempfield Township 36 Catskill Aqueduct 36 Folcroft 36 Representative Jason Altmire 36 Mishnock 36 Sally Cooey 36 Loyalhanna 36 congressman Curt Weldon 36 Lake Winola 36 NJDEP 36 PCB contaminated sediments 36 Project Rulison 36 hydraulic fracturing 36 Gov. Dick Thornburgh 36 Tinicum Township 36 ecologically sensitive wetlands 36 Maxatawny Township 36 Superfund hazardous waste 36 McAsphalt 36 Charles Sturcken 36 Swatara 36 NYCDEP 36 MWRA rerouted 36 Lower Burrell 36 Willistown 36 township supervisors 36 Coronet Industries 36 Wawarsing 36 Collegeville 36 Susan Turcmanovich 36 advocate Sonny Popowsky 36 Marcellus Shale 36 Kensico Reservoir 36 Delaware 36 Wellhead Protection 36 Calabrese Benton 36 total dissolved solids 36 remediated 36 air sparging 36 Upper Chichester 36 Newtown Township 36 Leakan 36 ordinances restricting 36 Riverstreet Manor 36 Abilheira 36 Lower Macungie Township 36 southcentral Pennsylvania 36 spokesman Lawrence Hajna 36 Bridgeville 36 Beinhauer Fryer Funeral Home 36 tritium leaks 36 Berks County 36 Riegelsville 36 IOGA 36 HoltraChem 36 shallow aquifer 36 perchlorate plume 36 fracking chemicals 36 Superfund site 36 Joe Sestak D 36 Saucon Creek 36 Lake Gerar 36 nitrate contamination 36 Theresa Barao 36 unlined pits 36 Mamm Creek 36 Tracy Carluccio 36 deepsea drilling 36 arsenic cyanide 36 Starmet 36 Brecknock Township 36 Marcellus Shale wells 36 Haverford Township 36 unnamed tributary 35 tritiated water 35 Heidelberg Township 35 Hazleton 35 Scranton 35 Clairton Coke Works 35 Kickemuit River 35 Farrell Sklerov 35 Doylestown Township 35 Amoco refinery 35 Ebensburg Pa. 35 nontidal wetlands 35 Johnstown Altoona 35 Meraux refinery 35 Norlite 35 Zazac 35 Freda Tarbell 35 spokesman Matt Pitzarella 35 IEPA 35 Yudichak 35 frac'ing 35 frack fluid 35 Potomac Riverkeeper 35 Geoffrey Thyne 35 zinc smelting plant 35 Lancaster 35 perchlorethylene PCE 35 Administrator Carol Browner 35 DEQ 35 TTHMs 35 Kathleen McGinty secretary 35 Gibsonia 35 MICHAEL REYNOLDS 35 Lottery visit www.palottery.com 35 challenger Lou Barletta 35 Duritsch 35 Muncy 35 Esopus Creek 35 Wingfield Pointe 35 NPDES 35 contaminents 35 Susquehanna River 35 Cresson Secure Treatment 35 haloacetic acids 35 Joe Scopelliti 35 PennVest 35 antidegradation 35 Larry Ragonese 35 WWMA 35 Milton Shapp 35 fracturing fluids 35 Hunlock Creek 35 Shandaken Tunnel 35 Shamokin Dam 35 Millcreek Township 35 spokeswoman Elaine Makatura 35 Warino 35 Alburtis 35 septage disposal 35 DiLascio 35 O'Pake 35 Forks Township 35 Septic tanks 35 colorless odorless radioactive 35 Hajna 35 Rulison 35 Bayou Verdine 35 hydrogeological 35 Pennyslvania 35 Flourtown 35 Richlandtown 35 Lower Swatara Twp 35 Secretary Colleen Castille 35 extraterritorial zoning 35 Randy Dallke 35 Slaiby 35 Glenmoore 35 NEW RINGGOLD 35 Upper Ringwood 35 Hanover Township 35 MTBE 35 chromium contamination 35 Anadarko Mitsui 35 Darlene Yuhas spokeswoman 35 DRBC 35 Water Pollution Control 35 Joint Sewer Authority 35 Whatcom watershed 35 Wilkes Barre 35 Genetti Best 35 SEECO 35 hydraulic fracking 35 Environmental Conservation 35 DVRPC 35 Richboro 35 hazardous substances pollutants 35 Neslin 35 Panaroni 35 Charles Sturcken spokesman 34 Lower Salford 34 Indspec Chemical Corp. 34 Zaca Station 34 Eisenla 34 ODEQ 34 Tunkhannock 34 Secretary Kathleen McGinty 34 hazardous liquids 34 Charbert 34 Dunkard Creek 34 Sen Arlen Specter 34 JEDDs 34 SDWA 34 Marcellus Shale formation 34 Oyster Creek Generating Station 34 chlorinated solvents 34 enact stricter 34 Sceusi 34 Olean NY 34 shallow aquifers 34 Milesburg 34 stormwater infiltration 34 Lower Macungie 34 PAWC 34 Pennstar Bank offices 34 Steuben County 34 Prelli 34 hog lagoons 34 Clean Water Act 34 Chris Korleski 34 MTBE additive 34 proposed Belleayre Resort 34 Chemetco 34 Lewisberry 34 Wyndmoor 34 Elysburg 34 Pennysylvania 34 Davidsville 34 Cannonsville 34 Dan Spadoni 34 Colorado Roan Plateau 34 Thermo Fluids 34 Hinckley Reservoir 34 unlined landfill 34 Syracusa 34 Mohnton 34 Pequea Township 34 CAFO 34 Downingtown 34 Frack Action 34 Safe Drinking Water 34 Glenshaw 34 Whitpain 34 ammonia hydrogen sulfide 34 East Hempfield Township 34 MDEQ 34 Kettleman Hills 34 Associated Carting 34 Doug Szenher 34 Ammazzo 34 Ginny Schrader 34 odorized 34 Matt Pitzarella 34 kiln dust 34 Abington Township 34 LDEQ 34 opencut mining 34 Patuxent Riverkeeper 34 Indspec 34 Luzerne Lackawanna 34 saltwater disposal 34 Nanticoke 34 Pamala Vazquez 34 BoRit 34 spokeswoman Wendy Rosenbach 34 Brandywine Hundred 34 nonpoint pollution 34 Wurfel 34 Shinglehouse 34 Toroney 34 Perciasepe 34 MassDEP 34 Rendell Prescription 34 extraterritorial zoning jurisdiction 34 LCP Chemicals 34 Gallenthin 34 backflow prevention valves 34 Pennvest 34 Kinosz 34 salty dissolved solids 34 Nickle Plate 34 Shoreland Zoning 34 sprayfields 34 Sinking Spring 34 Tilcon 34 wells drilled 34 Lackawaxen 34 Shermans Dale 34 Maxatawny 34 contaminate groundwater 34 Horsehead Corp. 34 toxic vapors 34 anthracite mines 34 Leviathan Mine 34 Prudehoe fields included 34 hydrogeologic 34 DNREC 34 benzene toluene ethylbenzene 34 Redfield Wilder 34 Honesdale 34 perchlorethylene 34 BTMUA 34 GHG permitting 34 Rick Santorum R 34 wastewater discharge 34 Aleutian Basin 34 AccuWeather forecasting 34 Nescopeck 34 Beech Hollow 34 CBPA 34 businessman Terry Pegula 34 Allentown 34 Finleyville 34 Aquarion Water Co. 34 Amfire 34 gravel pits 34 Elaine Makatura spokeswoman 34 Pennsdale 34 Bayou Texar 34 Lower Saucon Township 34 coalbed natural 34 Springettsbury 34 Mahanoy Creek 34 Skylands CLEAN 34 Wattsburg 34 Delaware Riverkeeper Network 34 suspected carcinogen 34 InterRoyal Mill 34 septage haulers 34 gypsum pond 34 Upper Makefield 34 Brodinsky 34 drillers 34 Teck Pogo 34 Environmental Quality Review SEQR 34 MagnaGro 34 Shun Pike 34 Nittoso 34 wastewater effluent 34 CAFOs 34 HAVERTOWN 34 Juniata 34 sprayfield 33 contaminates groundwater 33 PLEASANT MOUNT 33 Jackson Lael Stable 33 Mastrati 33 Lower Paxton 33 Gov. Mark Schweiker 33 Aquarion Water Company 33 Macungie 33 Utica shale formations 33 Manhan River 33 Raymark waste 33 ozone attainment 33 Noxen 33 gasoline additive MTBE 33 Environmental Protection 33 groundwater remediation 33 Mahomet Aquifer 33 Plimsoll chart 33 STEPHEN MORRISON 33 Northeastern Pennsylvania 33 O'Gurek 33 Tallevast residents 33 Litwhiler 33 Environmental Quality 33 coal slurry 33 Ashokan Reservoir 33 Loigman 33 voter referendums 33 Muskingum Watershed Conservancy 33 Ligonier Township 33 NCDENR 33 scrubber sludge 33 fuel additive methyl 33 drainfields 33 Central Platte NRD 33 Mayor Barry Zagnit 33 wastewater 33 PFOAs 33 Runkle Canyon 33 gasoline additive methyl 33 Mr. Dirienzo 33 Pennsyvlania 33 contamination 33 fuel additive MTBE 33 draft SGEIS 33 WSSC 33 Pepacton 33 hydraulically fracturing 33 Havertown 33 Vinsko 33 Mattabassett 33 Kathy Dahlkemper 33 Teresa Candori 33 Darrin Lautenschleger 33 Envirosafe 33 Aerovox 33 Kathryn Klaber president 33 Radnor Township 33 Pittston 33 DMME 33 Tioga 33 Topeka Kan. Lansing Mich. 33 slurry ponds 33 BTEX chemicals 33 dump dredge spoils 33 HARRISBURG DAUPHIN COUNTY 33 Masury 33 Factoryville 33 Marcus Hook 33 methyl tert butyl ether 33 Methyl Tertiary Butyl Ether 33 remediation 33 Uniform Construction 33 geoduck farms 33 Highspire 33 MURRYSVILLE 33 uncontrolled hazardous waste 33 Lower Esopus 33 Gilbertsville 33 ammonium perfluorooctanoate 33 Oreland 33 Houldin 33 Ron Rybarczyk 33 abutting landowners 33 Skudera 33 regulate hydraulic fracturing 33 Tianwaitian field 33 Act CERCLA 33 Cumru Township 33 Freda Tarbell spokeswoman 33 HUNTINGDON VALLEY 33 contaminants 33 Robesonia 33 Danville Montour 33 Lower Merion Township 33 nonattainment areas 33 Commissioner Amey Marrella 33 Bedrin 33 Abe Amoros spokesman 33 Cranberry Township 33 Cas Holloway 33 perfluorochemicals PFCs 33 Environmental Protection NJDEP 33 Nabil Al Hadithy 33 leaking septic tanks 33 visit www.recovery.pa.gov 33 extraterritorial jurisdictions 33 Antrim shale 33 National Pollution Discharge 33 slurry injection 33 APFO 33 Capacasa 33 Bob Bowcock 33 Gov. Milton Shapp 33 Clymer 33 Dover Knolls 33 Millheim 33 Catskill Watershed Corp. 33 Squantz Pond 33 fumigants 33 Edison Wetlands 33 Susan Obleski 33 Wormleysburg 33 spokeswoman Kristen Skopeck 33 http:/media#.washingtonpost.com/wp-dyn/content/phferry bamboo outrigger 33 flammable methane 33 groundwater contaminant 33 Shoreland Protection 33 inadvertently puncturing 33 Raline Smith Reid 33 Sisskin continues 33 Superfund designation 33 onshore blowouts 33 agriculturally zoned 33 UNI PHOTO 33 Divozzo 33 Conectiv 33 Federal Creosote Superfund 33 hydrogen sulfide 33 Huntingdon Township 33 Fitamant 33 Straban Township 33 Erie 33 Elstro 33 Jessica Greathouse 33 license plates EHH 33 Swatara Township 33 Shavertown 33 shoreland zoning ordinance 33 Moure Eraso 33 Cairnbrook 33 exempted fracking 33 Upper Macungie Township 33 groundwater withdrawals 33 deca BDE 32 sanitary sewer manholes 32 Chadds Ford 32 Cattaraugus County 32 bedrock aquifer 32 naturally occurring arsenic 32 Russ Forba 32 mine subsidence 32 Venango 32 Clearfield 32 Ed Coletta 32 NYSDEC 32 Kleen Energy plant 32 Towamencin 32 pollute groundwater 32 lucrative Marcellus Shale 32 PBIP 32 coal tar 32 Ralph Begleiter professor 32 dissolved solids 32 Derry Twp 32 Certified Valuations 32 Radnor 32 Utica shales 32 Trucksville 32 Derrivan 32 WH Sammis plant 32 Nitrate contamination 32 Remedial Action Plan 32 carcinogenic benzene 32 Nutri Blend 32 Marcellus Shale Formation 32 Prenter 32 Flintkote 32 SEQRA 32 unpermitted discharges 32 Natural Gas NJNG 32 spokesman Sean Bonyun 32 unsewered 32 SCVWD 32 Royersford 32 disinfection byproducts 32 Brycki 32 Cannonsville Reservoir 32 Atlantic Coastal Bays 32 Authority PENNVEST 32 pavement sealants 32 township 32 noxious odors 32 boy Daudi Bamuwamye 32 Escambia Treating 32 Hop Brook 32 proposed Glade Reservoir 32 Conneautville 32 Gary Newbrough 32 Towanda 32 Inland Bays 32 Mahanoy City 32 Harrisburg 32 Nepera 32 Metedeconk River 32 Prathers 32 Tobyhanna Township 32 septic tanks 32 Septic tank 32 Kotroco 32 Bunting Howarth 32 Housatonic River Initiative 32 Goudsmith 32 WVDEP 32 Magnolia Landfill 32 Healthsystem Association 32 Williamsport Lycoming 32 Mays McKees Rocks 32 CWM Chemical Services 32 septic 32 Allegheny Ludlum 32 Walter Mugdan 32 #st Century Appraisals 32 Richland Township 32 Dillsburg 32 Contaminated soil 32 Pensylvania 32 Rep. Frank LaGrotta 32 Outer Continental shelf 32 Maser Consulting 32 OSRC 32 Planimetrics 32 Cobbetts Pond 32 Sharpsville 32 Chescavage 32 Spotts Stevens 32 shoreland zoning 32 contaminate aquifers 32 inorganic contaminants 32 Shenandoah Riverkeeper 32 DEP Northcentral Regional 32 NPDES permits 32 Chrin Brothers 32 Borton Lawson 32 supplemental EIS 32 Cockburn Cement 32 Rep Joe Sestak 32 Caplan bioethics chief 32 Seidman Andrei 32 Erin Crotty 32 perc 32 Kentuckiana Trucking 32 contaminated soils 32 Commissioner Cas Holloway 32 Bryan Lentz 32 fracking wastewater 32 Barton Solvents 32 Ivyland 32 Generic Environmental Impact 32 borough 32 Pennsyl vania 32 HARRISBURG Pa. WHTM 32 Matt Pitzarella spokesman 32 racially restrictive covenants 32 Linette Quinn 32 Uniroyal Chemical 32 Shelocta 32 Terry Engelder 32 Schuylkill 32 coordinator Sam Borries 32 Univest Corporation 32 Secretary Yablonsky 32 SunCoke 32 Rep. Joe Sestak 32 Oley Township 32 Delware 32 Marcellus drillers 32 EOG Resources 32 Mahoning Township 32 Fairless Hills 32 MDEP 32 zoning ordinances 32 Motiva refinery 32 Warwick Sewer Authority 32 SCDHEC 32 PCBs polychlorinated biphenyls 32 Neuse River basin 32 South Fork Tenmile 32 WPSU PRCN #-#-# 32 Mount Joy 32 Girardville 32 backflow device 32 4PA TIPS 32 megadairy 32 hazardous waste landfill 32 Berks Schuylkill 32 Buqo 32 Conemaugh 32 Peronard 32 deepwater exploratory wells 32 Pennsylvanians 32 PENNDOT 32 Kennecott Minerals Co. 32 Jim Gerlach 32 Hafod Quarry 32 NICKEL MINES 32 test borings 32 ordinances regulating 32 Lawrence Ragonese 32 leachate 32 injection wells 32 Ozark Aquifer 32 Drainage Tunnel 32 Wyoming 32 Biedermann Packaging 32 Dunmore 32 backflow preventers 32 Westmoreland 32 Annville 32 Denig Chakroff 32 benzene nitrobenzene