\^ Geological and Mineral Survey of Vietnam - The Northern HEG Division

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1 \^ Geological and Mineral Survey of Vietnam - The Northern HEG Division Table. Analysed results in aquifer and standard limitation No -Sample points No of sampl e Type of water Symbo Commune District X Y ToC 0 ph EC DO Eh Alkalin Ity NH + As Mn Fe. The north area 0 0 MM C-" khy Cs Loa CTy vet t kinh doanh thdp SIM kot cfiu thdp SA Pb Pb Pb Pb Q Pb NguyOn Thanh Hud Giang Thl> TYnh Ng«V"n Bxnh UguyGn V"n ThiOu NguyOn V"n Bxnh NguyOn quang nh Nguyn V"n Do-n Sguy&i V"n Kh.nh NguyOn B. Kfi NguySn xnh rh«ng D-^ng Ngac Kidu Ph'm Thl> Hfi L" Tht Trang Xu n Men IT IT BXc King Bfcc Hang V n Ni rlli Bdi Mai L m Kim Ng «ng Hei C.n Kh Xu n Nn fhup L m ttmp L*m Sam Hang yam Hang BXc Hang ri'n D-ing L-ing Ng Li'n H;i Kim Chung Kim Ng Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^ < 0.,_ L

2 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division TrCn Xu n Huynh NguyOn Do n Thuy NguyOn ThO CtiVnh tto/mg Ki'n flguyon V"n 'i NguySn Trf Ddng NguyOn xnh ChiOn Ph'm V"n M>nh Ph'm V"n Huu NguyOn "ng Ho NguySn H+u Khoa NguyOn Nh Lu Ho/ing V"n Ty NguySn V"n Thuu NguyOn V"n Quunh Th e n Vn Ly NguyQn C«ng ThuEn Nguyn Tht Ljm Nguyn "ng Quang NguyOn V"n?Choan TrCn V"n KYnh NguyQn V"n Phong Cao V"n S->n TrCn V"n NhEra SJEng Xu n Ph-.ng NguySn V"n Bli Sfio V"n Lli SguyOn H-i-u ruyon An V"n Th/mh V n N i Ti'n D-.ng Ti'n D-ing Uy Nc Uy Nc Viot Hing V n H/i 'i M'ch Kirn Chung Kirn Nc Hli Bei VUnh Ngac VUnh Ngac Cae Loa Viot King Doc To Vang La Vang La HHi Bdi VUnh Ngac VUnh Ngac Xu n Canh Cs Loa Dc T «ng Hi «ng H^i «ai L m Hang Ku Trung Gi Sac S-.n Sac S-.n , Report on iuvestigaed results of arsenic pollution in ground-water in Hanoi city "=>

3 w Geological and Mineral Survey of Vietnam - The Northern HEG Division 0 S//O V"n Quy Dinh Xu n S^ng Nguyn V"n D-^ng NguySn Tht M ffl y NguySn Xu n H- -mg Phing V"n Trang TrCn Tht sun D.Ph D->ng Th> Nguy'n Nguyn V"n Hufin tfguyn V"n King NguySn L m "ng Sxnh T0nh WguyOn V"n Khoa NguyOn C«ng HEu Total standard TCVN 0- Numcer of samples which having higher content comparing with standard % of these samples Maximum content r s n Hng Minh TrY BXc Pho Quang TiOn T n Minh T n D n BY,c Ph VUnh Long Kim Anh Mai Sxnh Sac Kofi Ph Minh Phi Lc «ng Xu n Kim Lo Sac S-m Sac S-m Sac S-.ii Sac S-.n Sac S-m Sac S-m Sac S-m Sac S-m Sac Sac S-in S->n SSc S-m Sac S-m Sac S->n Sac S-m Sac S->n The SE area 0 Pb Pb Pb Pb Pb P0b Q0a Q Pb V Duy Thanh S Ngac ThuJ) Giang Bi'n ViOt Hng Long Bi'n Long Bi'n Co Khei rr u Quu Thing Thanh Long Bi*n Y'n Thenq Gia L 0 m Gia L e m S Gia L e ra Sia L e m Gia L s m *** Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^>

4 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division 0 Bii V"n PhEm NguyOn V"n Ben X- Ninh HiOp Nguyn H+u Nam ng TrCn Su tfguyfin xnh rufin T' xnh ThEm c Tht Minh 0 Sc 0c Long Nguyn Hang Duy Total standard TCVN 0- Numcer of samples which having higher content comparing with standard % of these samples Maximum content i"n Vi'n VT'n Vi'n Ninh HiOp xnh Xuy'n Phi ang Phi Sang frung MCu STgac Thu{ ec Giang L Chi S ia L ra Gia L ra ia L tn ia L m ia L e m district L' Sac Cao Xu e n Vn tfguysn V"n TuyOn L' V"n Huy L" Thanh H/a Sc Hing Cng Nguyn Thanh Xu n!jguyn Minh Ihlo rrcn QuO CSng rrcn B, V"n 0 0 r n triou r n triou r e n tridu 'i Kirn l>nh C«ng Homing Lit 'i Kirn rhanh LiOt 'i Kirn Ho/jng LiOt Report on investigaed results of arsenic pollution in groundwater in Hanoi city "=>

5 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division NguySn Vn Thi (JguySn KhXc fuen Vd Th/znh Chinh tfguysn 0c uang NguyQn TiOn C«ng NguySn Gia King L" V"n D--ng tjguy&n QuSc Hing L-^ng ThJ> Xuy'n Nguyn Xu n Lc HguyQn V"n Th nh HguyOn xnh BEy Nguyn "ng Qulng Iguyfin H^i «ng Pb Pb Pb Qa Pc P0b P0b Qa Pb SguySn Hang ChiSn L- Tin Ddng 0 0 JNICEF Ho/jng LiOt H*u Ho// H*u Hop Tl Thanh Oai Tl Thanh Oai Tl Thanh Oai T Thanh Oai Tarn Hi&p Tarn Hip VUnh Qutinh VUnh Quunh VUnh Quunh ' i. ng l i, ng LUnh Nam Y'n SS Y'n Se Thtnh LiOt Thanh LiOt Tl Thanh Oai Tarn Hip Ngd HiOp Li"n Ninh S'i.ng Sgac Hai S S S _ > Report on investigaed results of arsenic pollution in groundwater in Hanoi citv ^

6 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division 0 0 NguyOn B. Th«ng Phing V"n Cu TrCn tho «ng NguyOn V n ChiOn NguyOn M ' nh QuyOt Bii ac Minh Ho/mg V"n Bxnh Nguyn V"n Mong Trgn xnh Kha frcn V"n L" 0c Ting TrCn ViOt L'ng Cao V"n Chung Cao ThO Ph-mg V Ph, i Loc V"n Ch e n NguyQn V"n Th.i NguyOn Tht Ho/i Ph'm Vn Vu TrCn V"n S->n Bii V"n Kho.ng TrCn V"n QuUng Nguyn V"n Th/iiih JEng V"n Mil NguyQn V"n Giang Ho^ng V"n Heng Ngac Hai Li'n Ninh Li'n Ninh Li'n Ninh >i Kirn LUnh Nam TrCn Ph TrCn Pho Thtnh LiOt Thtnh LiOt Y'n Se Y'n Se T0 HiOp T0 HiOp Te> HiOp T0 HiOp Ngd HiOp Ng HiOp Ngo HiOp «ng Mii «ng Mu V'n Phc V'n Phc V'n Phc ' > ' < Va V"n Tufit NgyOn Thanh Nh m PrQn HiOp Duy'n KH p"n Se Y'n Mu Report on investigaed results of arsenic pollution in gronndwtiter in Hanoi city <$

7 wgeological and Mineral Survey of Vietnam - The Northern HEG Division Kguyn Kirn B?ch SSng B. H^i "Jguyfin Thl> Nho SJguyn V"n MSng L' V"n Ch->ng Ph'm V"n Chi Uguyn Nh Long Ch Tht> Ly Total 0 standard TCVN 0- ' Numcer of samples which having higher content comparing with standard % of these samples Maximum content [ Y'n Mii Duy'n HH fn Mu VT'n Se LUnh Nam Ng HiOp Duy'n H/i TrCn Ph E > district 0 Nguyn V"n BEy TrSng TH TC Trgng MN TC NguyOn Tht> Yn NguyOn Quang Trying V"n X-^ng <; Quang Trung Nguyn Tht H^ SJguyOn Tht> C«i Ho/mg Quang Dng Chu V"n ThXng be DNICEF Thing C.t Thing C.t Thing C.t Li'm M'c Li'm M'c Li'm M'c «ng Ng'c «ng Ng'c rhuf) Ph-ing «ng Ng'c T y Tuu T Li'm T Li'm T Li'm T Li'm P Li'm T Li'm T Li'm T Li'm S Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^

8 \ > Geological and Mineral Survey of Vietnam - The Northern HEG Division tfguysn Phan Hoan SguySn ThJ> Li * n NguyOn Tht Th n tfguyqn "ng Huy NguySn Trang *.n L* Quang Vinh SJEng Ngac Long NguySn Tht ThuEn Ph'm V"n Nght Chu TuEn King NguyOn ThO King D-ing Xu n Hang NguySn Tht D->ng V Kirn Blng L" V n NguySn TiOn HiOn NguyOn xnh King NguySn Huy Long TrCn V"n Hng Nghi'm Vn Lii NguySn Quy T/ii NguySn xnh To/in TrCn Ngac S->n 0 0 I r y Tuu reiy TJJ U Minh Khai linh Khai Minh Khai Pho DiSn Pho DiSn Cffi NhuO Cae NhuO Cs NhuO Xu n 0nh Xu n 0nh Xu 0 n 0nh Xu n 0nh Xu e n Ph-.ng Xu n Ph-ing Xu n Ph-.ng Xu n Ph-ing T e y M<; T y M<; T y Me ' i Me 'i Mp To Li'ra T Li'm T Li'm T Li'm T Li'm T Li'm fi " H Report on investigaed results of arsenic pollution in groundwater in Hanoi city *$ 0

9 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division NguySn V"n Sic Vo Thl> NguyOt L' V"n Trinh NguySn v"n T L" Tht> Gi.p Bli V"n Kho.i Bii V"n M»nh Homing Xu n Nhufim Nghi'm V"n H'nh NguySn H*u Sang NguySn ThJ> T*m NguySn KhXc Xe NguySn Th^nh King TrCn Quec Tuy'n NguySn xnh Quunh Tang kho I. BCN Pb Q Pb Pb Pb Total standard TCVN 0- 'i M<; 'i Mg Ph DiSn Mu xnh Mu xnh Mu Sxnh Mii Sxnh CQu DiSn M Trx MO Trx M Trx M Trx MS Trx Trung V"n Trung V"n Ph DiOn Thing C.t Minh Khai «ng Ng'c T c y M? MS Trx To Li'ra To Li'ra T Li'm T Li'm T Li'm ra Li'm , H Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^

10 (^ Geological and Mineral Survey of Vietnam - The Northern HEG Division Numcer of samples which having higher content comparing with standard % of these samples Maximum content In the urban area 0 0 Q Ng«Quang Xu n Pc Pb Pb Pb Pb Pb Pb PS Ob NguyOn V"n HIng TrCn V"n V*n Ngac Mai TrCn V"n Ho/a Ng«c Tht Kirn Kh.nh NguySn Ngac Khoa Bii Do-n e TrCn Ddng B^o D-ing V"n T?ch TrCn V"n Thinh Pb Pb Pb NguyQn ChY Thanh Irung Tu Ngac H^i Si Ing VS rhanh L->ng SguySn Du B.ch Khoa rhanh Nh/m T-ing Mai r n Mai VUnh Tuy Quunh L«i Quunh L«i Quunh L«i Quunh L«i Ho/mg v"n Th Ho/mg V"n Th VUnh Tuy VUnh Tuy VUnh Tuy Hofmg V"n Th Phc X. Ch-ing D-mg Ph Thing Sdng a Ba xnh Ba xnh Hai Bfi Trng Hai B/i Trng Hai BII Trng Hai BH Trng Hai B/i Trng Hai Bfi Trng Hai BH Trng Hai BH Trng Hai B;j Trng Hai Bfi Trng Hai BH Trng Hai B/i Trng Hai BH Trng Hai Bfi Trng Hai Bji Trng Hai B/i Trng Hai Bji Trng Ho/m KiOra Hojm Kim Kojm KiOm r y Ha O.S < Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^>

11 w Geological and Mineral Survey of Vietnam - The Northern HEG Division Chu V"n Sic Bii Tht Khei Nguyn V"n Hi On L' Tht BYch Ho/mg V"n SUnh Ph'm ThO Treng Pb Pb Q Pb Nguyn Hang Thanh i xe V.T.V c V"n Lai Hofmg Thl> Ho^i Pb Pb Pb NguySn V"n Lli NguySn v"n iro Nguyn Thl> Thfmh NguyOn Sac Sang D-.ng NhEt Huy 0 * NguySn V"n ChYn Total standard TCVN 0- Numcer of samples which having higher content comparing with standard JjK Pho Thing NhEt T n NhEt T-'n Qu^ng An Qulng An Xu e n La Ph Thing Qulng An Ta Li'n Thup Kh' T0 Li'n Nh n ChYnh Thing Sxnh Kh-ing Trung Nh e n ChYnh Nh n ChYnh H Sxnh DI>ch Vang Y'n Ho/i Y'n Ho/z Trung Ho^i Trung Ho/i NghUa «T y Hli T y Kb T*y lib T c y Kb T*y Kb T^y Kb T y Hi T y Kb T e y Ha T y Kb T e y Kb Thanh Xu e n Thanh Xu e n Thanh Xu e n Thanh Xu e n Thanh Xu e n Thanh Xu n CCu Gifiy CCu Gi y CCu Gifiy CCu Gifiy CCu Gifiy CCu Gifiy Report on investigaed results of arsenic pollution in groundwater in Hanoi city *$

12 w Geological and Mineral Survey of Vietnam - The Northern HEG Division % of these samples Maximum content ISO.. General areas Total standard TCVN 0- Numcer of samples which having higher content comparing with standard % of these samples Maximum content * Report on investigaed results of arsenic pollution in groundwater in Hanoi city "=!>

13 vi> Geological and Mineral Survey of Vietnam - The Northern HEG Division Table. Analysed results in lower aquifer and standard limitation No Sample points No of sampl e Type of water Symbo Commune District X Y ToC 0 ph EC DO Eh Alkalin ity NH + As Mn Fe. The north area 0 C«ng ty Lixeha MM g'ch Phoc Thfcnh CTy c-> kh? <ct«- NM Ch t'othiot bt> in CTy c-. khy Nhfi m.y Z BV BXc Th'ng Long XN B* t«ng bu «in II CTy TNHN fii ViOt CTy c-. khy Nam Hang TT giao lu v"n ho. kinh to CTy XD sd Th'ng Long CTy CK Vfi XD rh'ng long ITTy g'ch chtu a CCu ueng CTy bet gi«t Lix Pa Pa 0 Nguy'n Kh" Nguy'n Kh' TT Xu n NSn TT Uy N<; Uy N? Mai L m Cs Loa data Hang Ham Hang Kim N<; Hli Bei Mai L m IT BXc Hang B%c Hang S Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^> _ e < <

14 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division Pa Pa PSSa Pa Qa Q 0 Phan TuEn Dng Ng«Nh Hli NguyOn Gia Chfnh T V"n Quang TrCn Xu n Lc S e n bay N< i B/ti Nh^ m.y chl Kirn Anh Pa PSSa NguySn V"n DuyOt NguyOn Thl> Hfi CTy M«i trgng HM Nei L' Anh Quynh L" Xu n Chu«ng NguyOn Thl> B^y V V"n TiOn L' V"n 'i NguySn Ngac *inh!iguyn V"n fuyon rrcn ThS BXc siguyon Sec rhuc Phan V ffi n TrQn 0 0 V n Nei Kirn Nc HHi Bei TCm X, Mai L m Dc To V*n M«n «ng Hei Xu n Nen Xu ffl n Canh «ng Hei Mai L m Ni B/ii Mai xnh Pho Ceng Ph CSng BXc S-.n BKc S-.n Nam S-m Hang Ku Minh Ph Phi Linh Xu n Giang Hin Ninh Ti'n Die 0 Kirn L Sac S->n. 0 Ph Ceng Sac S->n. 0 BXc Hang Sac Sin. By,c Hanq Sac S->n. H Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^ Sac S-in Sac S->n Sac S^n Sac S-m Sac S--n Sac S-in Sac S-^n Sac S-m Sac Sac S->n S->n Sac S-m Sac S->n Sac S- n <

15 wgeological and Mineral Survey of Vietnam - The Northern HEG Division Total standard TCVN 0- Nutncer of samples which having higher content comparing with standard % of these samples Maximum content The SE area 0 0 Nguyn v"n CCu 0fm v"n Ch u NguyOn Ph Vi'n L' V"n Bay CTy gicy Y'n Vi'n Ga Yi'n Vi'n NM gg CCu u ng CTy ca phcn khf c«ng nghiop Nh^ m.y Z CTy x'ng dcu chu vile I Hac vin heu ccn --n vl> J Trung t*m nghi'n c0u d u t»m Kirn khy Sac Giang S->n vj> HTX c«ng nghiop Long Bi'n XN C-. in 'nh D-ing Quang Ki'u Kp B.t tr/mg B.t tr^ng Y'n Vi'n Yi'n Vi'n Thing Thanh IT Sac Giang Ngac Thup Sac Giang Ngac Thup Slgac Thup Sgac Thup Sac Giang ia Thup Ba ia L m ia L m ia L e m ia L e m Gia L e m Gia L e m ia L m S Ba ia L a m 0.. Report on investigaed results of arsenic pollution in groundwater in Hanoi city "=>

16 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division rtqu e n *i C Khu nh/i ngh0 ORion-Hanel C«ng ty ccu C«ng an huyon Sia L e m Xeng gia c«ng cho t. c vjmg NM s*a HH N i 'i hac N«ng nghiop I TrSng trung hac KTO Z XN nhtia Sao Mai Pa Pa Pa PISa Pa Pa Pa Pa P0a Q0b Ug«C«ng Ng*n Phing Huy Toln Bu in x- Thing Thanh *S V"n M'c tfguysn V"n ruydn Uguyfin V"n Cou TrCn Tht SInh Ngac L m rh'ch Bjm Ca? Bi JEng X, tr u Quii D--ng X, Ki'u K D-.ng X. Ngac Thy Giang Bi'n Vit Hng Sfii Sang Bi Long Bi'n Long Bi'n Long Bi'n Cti KhSi Tr c u Quti If'n Theng Y'n Vi'n Thing Thanh Thing Thanh Siang Bi'n Sia Thup Viot King Sia L ffl m Sia L e m Gia L m Gia L s m Gia L m Gia L e m Gia L m Gia L*m Gia L*m Gia L 0 m S Gia L c m ^ Report on investigaed results of arsenic pollution in groundwater in Hanoi city "=> < <

17 u^ Geological and Mineral Survey of Vietnam - The Northern HEG Division tfguyon Tht> Tho.n Kiu Thfc Thanh L' V"n Thao NguySn V"n The) Ph'm V"n Huunh Treng tiu hac Gia Thu > c Huy Th«ng NguySn Thl> «ng NguySn V"n Trung Bli V"n XuySn Tr-mg H+u LuEn So^n V"n Theng g V"n TuEn NguySn Thl> Thu Ho/zng Tht Vinh L" Sxnh Trinh Khc Thl> TuyOn NguySn ThS S,ng ng Thl> LuyOn Lu ThJ> T»m NguySn V"n To/in NguySn Xu s n Bi NguySn V"n H/io SXng Vn Lu n Spo Thl> -fch Chu V"n Su NguySn Thl> HuO NguySn Tht Ph- ->ng ThUo Ti Giang Bi'n Thing Thanh Hei X, Kng X. LO Chi Gia Thu > Long Bi'n Long Bi'n Th'ch B/m Cae Bi Cs Bi *ng X. Ph Thi Kirn S-in Cu Khei Cu Khei Th'ch B^n Tr u Quu Ph Thuj) D-mg Quang Kirn S-*n «ng D «ng D a Ten a TSn rr u Quu Ki'u Kt D-ing X. Gia L s m Gia L tn Gia L m Gia L e m ia L s m ia L e m ia L ro ia L s m ia L e m ia ia L ffi ra L ffl ra Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^

18 wgeological and Mineral Survey of Vietnam - The Northern HEG Division Total standard TCVN 0- Numcer of samples which having higher content comparing with standard % of these samples Maximum content » district 0 0 XN khlo s.t ion I NM s-m HM Ni CTy TNHH H-^ng Qutinh CTy ph e n l e n Vn Sin NM Pin V"n in Khu TT ViOn y hac d n tsc CTy cae phcn fbt th-.ng M J i XNXD -CTy X«y IXp CTY b" t«ng Thtnh LiOt XN KTNN B NN & PTNT CTy XD c«ng trxnh!m nlc Thanh Trx ViOn KHKT NN Vit Nam CTy c«ng trxnh giao th«ng BV khu vuc I B NN& PTNT 0 0 Thanh LiOt Thanh LiOt Tarn HiOp Tarn HiOp V"n in tnh C«ng nh C«ng tnh C«ng Thl>nh LiOt Ho/jng LiOt flo//ng LiOt V"n in VUnh Quunh Ngd HiOp Ngac Hai \ Report on investigaed results of arsenic pollution in groundwater in Hanoi city "=>

19 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division CTy CK soa ch+a CT eng b II Pa P0a P0a Qb Qb 0 0 Pa Pa Pa Total standard TCVN 0- Numcer of samples which having higher content comparing with standard % of these samples Maximum content rhanh LiOt ram HiOp r^ Thanh Oai rhtnh Lit >»g HiOp Li'n Ninh LUnh Nam Y'n Se district 0 rh«n T e y Tuu UBND x- rh«n tnh Qu.n O(oi go Cc gu c n khf Th«cn T y Me CTy 0 v sinh Xam Ngang-S'i M<? TrSng TH KThufit in rrsng CB KT thfiy v"n rrsng MQn non Kidu Mai CTy cao sti Hp»ei 0 T e y Tiiu linh Khai Ph Din Xu n Ph-.ng T y Mp T y Me S*i Me Ph Din Ph DiSn Ph Din C?u DiSn T Li'm T Li'm T Li'm T Li'm T Li'm Li'm * n Report on investigaed results of arsenic pollution in groundwater in Hanoi city *$

20 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division Li'n "o^n ta chfit x hiom Tr'tn karota PKKQ rreng tiu hac TrCJn QuSc Tufin UBND x- M Trx o/m K. Ta»ng cc -QSND -in vl> t'ng thiot gi.p freng H t/ii 0 chfnh k to.n Pb Pa Pa - Q.a Pa Pa Pa * 0 Total Standard TCVN 0- Numcer of samples which having higher content comparing with standard % of these samples Maximum content * Ph DiOn CQu Din "lu xnh \l Trx Li'n M'c Cs NhuO «ng Ng'c C<^a DiOn Thing C.t «ng Ng'c <inh Khai r y Me u xnh rhup V"n Li'm TS Li'm In the urban area 0 Pa P0a Pa Pa Pa P 00 Ceng Vl> Ceng Vt y*n Ph rrcn Ph Silng va SJg«SU Li'n Ba xnh Ba xnh Ba xnh Ba xnh Ba Sxnh Ba Sxnh Report on investigaed results of arsenic pollution in groundwater in Hanoi city *$

21 ^Geological and Mineral Survey of Vietnam - The Northern HEG Division 0 0 rang CTy th-ing M>i & XD CTy may Th'ng Long NM dot Minh Khai P0a Pa PSa Pa Pa Pa Pa Pa PSa Pa Qa TT dtch vo vioc /itn Kfi Ni PSa Pa Pa Pa Qa XN ^ta chit H Ngo'i Ng-iip. Ni CTy XD C«ng trxnh S'i hac PhSng ch. y ch-i-a ch. y TrSng cao Mng giao th«ng ven tli ViOn S.chEt K.sln »Iinh Khai Minh Khai Minh Khai VUnh Tuy NguyOn Du Ph'm xnh Ha Thanh L->ng B.ch Khoa Thanh Nhjm T-mg Mai T c n Mai Ch-ing D-mg Trung Tu Y'n Hop Trung Hop Mai DI>ch NghUa T n Dtch Vang Mai Dtch Nh n ChYnh rhanh Xu e n Nam rhanh Xu e n Wh n ChYnh Nh n ChYnh rhanh Xu n Nam rhanh Xu n V"n M<; Hai Bjj. Trng Hai Bp Trng Hai Bp Trng Hai BII Trng Hai Bp Trng Hai Bp Trng Hai Bp Trng Hai Bp Trng Hai Bp Trng Hai Bp Trng Hai Bp Trng Hopn Kim Hopn Kim SSng a CCu Gifiy CCu Gifiy CCu Gifiy CCu Gifiy CCu Gifiy CCu Gifiy Thanh Xu n rhanh Xu n rhanh Xu e n rhanh Xu n ~i; 0 0 Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^> <

22 () Geological and Mineral Survey of Vietnam - The Northern HEG Division Pa Pa Pa CTy bao bx Th- ^ng M'i XN «t«- -m vl> tiu Go/in Pa Pa Qa PlOa Pa 00 0 Total standard TCVN 0- Numcer of samples which having higher content comparing with standard % of these samples Maximum content Uh n ChYnh Uh n Chfnh H xnh Ph Thing Qu^ng An Ph Thing Ph Thing Qu^ng An Te> Li'n Qulng La Thup Kh' rhanh Xu n rhanh Xu e n rhanh Xu n r e y HS r y Ha r e y Ha r y Ha r y Ha r y Ha r y Ha r y Ha < General areas Total standard TCVN 0- Numcer of samples which having higher content comparing with standard % of these samples Maximum content Report on investigaed results of arsenic pollution in groundwater in Hanoi city ^

23 Geological and Mineral Survey of Vietnam - The Northern HEG Division VI. Some opinions about the reasons of groundwater pollution The investigated results showed that the groundwater in upper and lower aquifers has signal of pollution with heavy metal ( arsenic, manganese ) and ammonia. For arsenic: the pollution area in two aquifers is mainly in the south and SE area of the Hanoi. The pollution space scale is rather similar with occupation in total analysed samples with.% of pollution scale in upper aquifer and.% in lower aquifer. Specially this pollution areas are coinciding with distribution area of the high polluted area of ammonia. For manganese: the content in both two aquifer is higher than standard limitation. The pollution scale is.% for upper aquifer and.% for lower aquifer. The high pollution area is in the centre and strip along Red river and Duong river. For iron: the content in both two aquifer is higher than standard limitation. The pollution scale is 0.% for upper aquifer and.% for lower aquifer. The high pollution area is in the centre and in south area. For ammonia: The pollution area in two aquifers is in the centre and SE area of Hanoi city. The distribution area in two aquifers is coinciding with pollution scale:.% in upper aquifer and 0.% in lower aquifer. The distribution of pollution area is coinciding with distribution of peat and mud layers. Based on the geological- hydrogeological condition, relationship between factors and analysed data the reasons of these pollution can be: Due to man-made: the factories, enterprises, dwelling places have huge amount of liquid waste and solid waste, mostly they are not treated. The river system, lakes, drains are passing with high density. The waste percolate in to groundwater. Due to groundwater exploitation: the water level is lowered due to increasing of percolation and degree of pollution, the chemical- physical process can pollute groundwater resources. The content of heavy metals in the soils is rather high, in these arsenic content is.0" -.0" %. During exploitation of groundwater the peat, mud is disintegrated, a large amount of methane is released, they are combined with asenic creating methylasen and dissolved into groundwater. Hence one can says the reason of arsenic pollution in groundwater in south of Hanou area is from clay, mud clay mixed with organic matter and peat layer. The above mentioned opinions for reasons of groundwater pollution, the detail study, specially origin, forming process, content and distribution in ^ ** Report on invest igaed results of arsenic pollution in groundwater in Hanoi city "=>

24 ( V ) Geological and Mineral Survey of Vietnam - The Northern HEG Division soils should be carried out. Then the available protection and remediation methods can be determined. VII. Some proposes for the next study The preliminary investigated results showed the right way of study method, and it can be applied in the rest province of the Bacbo plain. In other hand these results are reliable base for the next study in the Hanoi area to use rational groundwater resources and protection of community health in point of view. We have following proposes: Investigate status of groundwater exploitation : quantity of well, pumping rate, aquifer, schedule of exploitation. Investigate degree of groundwater pollution by heavy metals in general and arsenic in particular, environmental pollution in whole Bacbo plain in following steps: First step : Continue to sample in the existing observation wells, production wells, wells in provinces of Bacbo plain to determine areas which having higher content comparing with standard limitation. The implement method is similar in the Hanoi area, Second step: sampling and analysing in the high content area which is deternined in the first step. Soil sampling for geochemical analysis in the high content areas to determine origin and relationships of pollution ( implement for Hanoi city). Third step: Foundation, select optimal locations and sampling continuosly with time (implement in Hanoi city) - Implement investigation to determine reasons and origin of groundwater pollution - Creating groundwater flow model and groundwater transport model of the contaminants to evaluate, manage and forcast groundwater resources. Social investigation: patholgy relating to water, considerate standard limitation for some elements. - Study treatment technology \ The implement form is the Government supply capital to the Geological branch having collaboration with relating Ministries, universities, institutes, the other organization in country and oversea. the Northern Hydrogeological Engineering Geological Division director Hd Noi, th March 00 On behalf of authors Tdng Ngoc Thanh Report on investigaed results of arsenic pollution in groundwater in Hanoi city *$