'»euitc»u«jr. i^ecemoef »•». vjou / Kuies ana Kcguiations 



{••) S«l«ctint liM disposal sits. th« 

 (iischMffs poiau and tha malhod of . 

 disrhurf* to minimiia Iba sxtanl of any 

 piuma: 



(0 Designing iha discharga of dradgtd 

 or nil maiehal lo m i n imii a or pravant 

 tha crtMiion of standing bodiaa of water 

 in areas of normally fluctuatins water 

 levels, snd minimiza or prevent the 

 drainage of areas subject lo such 

 fluctuations. 



f 390.71 Acttona eofiaamin9 ttM natartal 



The effects of a discharge can be 

 minimisTd by treatment ol or 

 timitstians on Iha malarial itsalt such 

 as: 



(a) Disposal of dredged material in 

 such 4 manner thai physiochemieal 

 conditions arc maintained and the 

 potency snd availability of pollulanu 

 are reduced. 



(b| Limiting the solid, liquid, and 

 gaseous components of material lo b« 

 discharged at a particular sile: 



(c) Adding treatment subatanca* to 

 the discharge malarial: 



(d) Utilizing chemical Oocculants to 

 enhance the deposition of suspended 

 particttlatas in diked dispoaal wom. 



The effects of the drodged or fU 

 material after discfaarga may ba 

 controlled by: 



(a) Selecting discharge methods and 

 disposal sites where Iha potandai for 

 ereeioa. slumping or laadiing of 

 materials into the surrounding aquatic 

 ceoeystem will be reduced neeo sitae 

 or methods induda. but are not limited 

 lor 



[X\ Using coQteinment iavaea. sadimant 

 hMins. and cover crops to reduce 



{2i Using lined eoBteininant araaa lo 

 caduca laacfaiag where 'r'rfint at 

 cbenicd coestltaenta Iram tfao 

 discharged material ia expected to bo a 

 problem: 



(b) Capping in-piaco nontaminaled 

 material with doaa BataiiaJ or 

 sffteetlvely rtisrharging iha aeet 

 cottUminaled malntelBrat to be capped 

 with the remaining maiwiat 



(c) Mainteiaing ad — »*«»«««g 

 disdiarged matwiaJ p »B |> a il| to pravant 

 point and oonpoial aooreao of poOatiaa: 



(d) Timing tne dtacharge to »"*"»'«'«■ 

 impact for instenca during periods of 

 unusual high water flows, wind. wave, 

 and tidal actions. 



1 230.7) Acttona affecting ttM mefhod Of 



(a) Where environmentally desirable, 

 distributing the dredged malarial widely 

 - in a thin layer at the disposal site lo 

 maintain natural substrate contours Mnd 

 elevation: 



|b| OHenUng a dredged or fill material 

 mound lo minimize undesirable 

 obstruction to the water current or 

 dreulalion p<titem. and ulilisiiig natural 

 bottom contours lo minimise the size of 

 the mound: 



(c) Using silt screens or other 

 appropriate methods lo confine 

 suspended particulate/turbidity lo a 

 small area where selUlng or removal can 

 ocean 



(d) Making use of currents and 

 dreulalion patterns la mix. dispe<w and 

 dilute the discfaaiga: 



(a) Kfinimizing wain column turbidity 

 by using a submerged difluser system. A 

 similar alTaet can ba aeeanplisbed by 

 submerging pipeliaa discfaargesor 

 otherwise releasing materials near the 

 bottofle 



(() Selecting sites or maaagiag 

 diadiarges to coafliM and oiifiiBiiia Iha 

 release of suspended particulates to give 

 decreased tarbidlty lavals and to 

 aiNiataia U^t peaatradoa tor organisBis: 



(g) Sattiag liaitedoas on the ameaa» 

 of material to ba diachargad per anil of 

 ttmaorvolawaofraca i v im gwatar. 



|3IOiJ4 AaMana ralaiad la teehnetefy. 



Dlachatge laefanobgy should bo 

 adapted to tha aeada of each site, fa 

 determining whathar tha discharge 

 operatioa safltdaatly adaimixee adverse 

 enviraoaental Inpaeta. tha ap^icaat 

 should caaaidan 



(a) Using appropriate equipoMBl or 

 aMcfaiBary> inriiiHing ptotekUva daviees^ 

 and tha aaa of aadh eq ul paa a t or 

 Buehiaary ia acttvltlaa raiatad to tha 

 diacharga of dradgad or ffl laatarial: 



|b| rJH iii o ylag appcoptiata 

 ■aiBtaaaaoa aad oparatSaa aa 

 aqidpawat of SMchiaary^ itu Imilng 

 adaquato trainiag. stafRag. aad warUag 



The effects of a discharge can be 

 minimized by the manner in which it is 

 dispersed. lucb ss: 



(c) Using machinery and tadmlquee 

 that are especially dasigned to reduce 

 daoMga to wetlands This auy iadada 

 machinae equipped with devices that 

 acattar rather than awuad excavated 

 ■utariala. machiaea with specially 

 daaigaad wheels or tracks, and tha use 

 of matt under heavy machines to rsduee 

 wetland surface corapactloa and ratting 



(d) Designing acceaa roads and 

 channel spanning structures using 

 culverts, open channels, and diversions 

 that will pass both low and high wrater 

 flows, accommodate fluctuating water 

 levels, and maintain circulation and 

 faunal movement 



(•) Employing appropriate machinery 

 and methods of transport of the matenal 

 for dischsrge. 



f 2M.7t 



Minimization of sdverse effects on 

 populations of plants and animais can 

 be achieved by: 



(a) Avoiding changes in water current 

 and circulation paitems which would 

 interfere with the movement of animals: 



(b| Selectuig sites or managing 

 discharges to prevent or svoid creatiag 

 habitel eandudve to the davalopmanl of 

 undesirable predators or species which 

 hsva a competiUve edge ecdogically 

 over indigenous piantt or saiinais: 



(c) Avoiding sites having aniqaa 

 habitat or other vahia. induding hebital 

 of threatened or endangered spedaa: 



(d) Using pianaiag aad eoaatruetion 

 practices to iastitate habitat 

 development aad reatoratioa to predvea 

 a new or modified eavi r o am aatal state 

 of higher ecological vahM by 

 dispiacemeat of soma ar all of tha 

 existing enviroamealal charactariatica. 

 Habitel development aad reatoratioa 

 lachniqaas caa be used to Bhdadaa 

 adverse impaett aad to caatpeasata br 

 destroyed habiteL Use todu^qoaa that 

 hata baea demonsiratad to ba afllsetiva 

 ia drramatancas siadlar to Ihoea aadar 

 caadderatlaa wherever paaaibia. What* 

 p roposed devalopweat aad raatoratioB 

 teehaiquee have not yet advanced to dto 

 pilot deaMastraUoa stage, iaittete their 

 use oa a small scale to allow eorrectiva 

 actioa if anantldpaled adverse impactt 



(a) Tbaing diacharge to avoid 

 spawning or aiigratioa seasons aad 

 odMT biologically oitical time periods: 



•(I) Avei^ dw deetnetioa of 

 remaaat aataral sitea withia araaa 

 alraady afbctad by I 



Mlnlmisatioa of adverse aJTacts aa 

 huaaaa use poteatiai may ba achieved 



(a) Selecdite dischaige sitea aad 

 following disdurgs procedures to 

 prevent or minimiia say poteatiai 

 daauge to the aaethetleaily pleasing 

 featuree of tha aqaade site {94, 

 viewscapee). partlcalariy with respect to 

 weter qiiality: 



(b) Selecting dispoeal sites which era 

 not valuable as natural aquatie areaa: 



(c) Timing the Ascharge to avoid tha 

 seasons or periods when human 

 recreatloaal activity associated writh the 

 aquatic site is most Important 



(d) FoOowiag discharge procedures 

 whidi evoid or mlnlmire the disturbance 

 of eestbettc features of sn aqiutlc site or 

 ecosysleta. 



63 



