{"id":67783,"date":"2017-02-02T22:15:59","date_gmt":"2017-02-02T20:15:59","guid":{"rendered":"http:\/\/staging.sillon38.com\/?p=67783"},"modified":"2017-02-02T22:15:59","modified_gmt":"2017-02-02T20:15:59","slug":"securisation-de-lalimentation-en-eau-potable-de-vif-le-gua-et-varces","status":"publish","type":"post","link":"https:\/\/www.sillon38.com\/blog\/2017\/02\/02\/securisation-de-lalimentation-en-eau-potable-de-vif-le-gua-et-varces\/","title":{"rendered":"S\u00c9CURISATION DE L\u2019ALIMENTATION EN EAU POTABLE DE VIF, LE GUA ET VARCES"},"content":{"rendered":"

La source de l\u2019\u00c9chaillon, alimente gravitairement en eau potable 90 % de Vif, 70 % de Le Gua et 25 habitations sur la commune de Varces-Alli\u00e8res et Risset (8 500 hab.) Il n\u2019existe pas d\u2019interconnexion de secours sur une autre ressource en cas d\u2019incident exceptionnel sur le captage le rendant inutilisable.<\/span><\/p>\n

Suite \u00e0 l\u2019\u00e9pisode de pollution bact\u00e9riologique et virale massive qui a conduit \u00e0 une restriction d\u2019usage de l\u2019eau distribu\u00e9e du 20 au 24 mars 2016 \u00e0 Vif, Le Gua et \u00e0 un hameau de la commune de Varces-Alli\u00e8res-et-Risset, les \u00e9lus du Conseil M\u00e9tropolitain ont d\u00e9cid\u00e9 \u00e0 l\u2019unanimit\u00e9 de substituer la source de l\u2019\u00c9chaillon par un nouveau forage cr\u00e9\u00e9 dans la nappe du Drac, en conservant la source de
\nl\u2019\u00c9chaillon en secours.<\/strong><\/span><\/p>\n

Cette d\u00e9cision, prise lors des Conseils m\u00e9tropolitains du 27 mai et du 1er juillet
\n2016, s\u2019ajoute aux mesures post-crise enclench\u00e9es selon un calendrier soutenu :
\n– rel\u00e8vement du niveau de chlore, des contr\u00f4les bact\u00e9riologiques et surveillance
\naccrue
\n– renforcement des proc\u00e9dures de suivi de traitement pour d\u00e9tecter toute
\nvariation de la qualit\u00e9 de l\u2019eau et adapter la d\u00e9sinfection en cons\u00e9quence
\n(monitoring)
\n– contr\u00f4le exhaustif l\u2019assainissement en amont du bassin versant (r\u00e9seau de
\ncollecte, station d\u2019\u00e9puration, assainissement non collectif).
\n– lancement de la prc\u00e9dure de r\u00e9vision de la DUP (suite \u00e0 l\u2019\u00e9tude de vuln\u00e9rabilit\u00e9
\nmen\u00e9e par le SIVIG)
\n\u00c9tude de faisabilit\u00e9 pour la s\u00e9curisation de la ressource de l\u2019Echaillon (mai 2016)
\navec plusieurs sc\u00e9narios \u00e9tudi\u00e9s
\nUn projet global de s\u00e9curisation et de substitution de la ressource de
\nl\u2019Echaillon :<\/strong>
\n– Cr\u00e9ation du captage de Petit Brion dans la nappe du Drac \u00e0 Vif ;
\n– Cr\u00e9ation de 5 stations de pompage ;
\n– Raccordement aux r\u00e9seaux d\u2019adduction : pose de nouvelles canalisations sur un
\nlin\u00e9aire de 3 200 m
\n– Modification des r\u00e9servoirs existants (hors RNR) ;
\n<\/span><\/p>\n

– Mode de secours fonctionnel conserv\u00e9 depuis le captage de l\u2019Echaillon (en cas de
\ncasse ou de probl\u00e8me rencontr\u00e9 sur le nouveau forage).
\nImplantation du nouveau captage d\u2019alimentation en eau potable :
\n– Implantation au sein du P\u00e9rim\u00e8tre de Protection Imm\u00e9diat des captages de
\nRochefort, autrement dit dans un p\u00e9rim\u00e8tre d\u00e9j\u00e0 prot\u00e9g\u00e9 et permettant le pr\u00e9l\u00e8vement d\u2019une eau
\nnaturellement potable sans recours au traitement
\n– Un travail partenarial est enclench\u00e9 avec la RNR des Isles du Drac pour d\u00e9finir la
\nmeilleure implantation du captage<\/span><\/p>\n

La phase 1 du projet de s\u00e9curisation de l\u2019alimentation en eau potable
\nde Vif et Le Gua<\/strong>
\n– Premiers travaux sur les avenues d\u2019Argenson et du 8 mai 1945 : janvier \u2013 juin 2017
\n– Pose d\u2019une conduite d\u2019adduction en eau potable (Diam\u00e8tre 250 mm – longueur
\n730 ml) avec en parall\u00e8le un renouvellement des r\u00e9seaux d\u2019eaux us\u00e9es et
\npluviales
\n– Montant des travaux : 908 000 \u20ac HT dont 160 000 \u20ac HT pour la s\u00e9curisation
\n– Forage d\u2019essais et pi\u00e9zom\u00e8tres dans la RNR des \u00eeles du drac : janvier-f\u00e9vrier 2017
\n– R\u00e9alisations de 6 pi\u00e9zom\u00e8tres de 20 \u00e0 30 m de profondeur
\n– R\u00e9alisation d\u2019un forage d\u2019essai de 240 mm de diam\u00e8tre \u00e0 35 m de profondeur
\n– Essai de pompage \u00e0 60 m3\/h pendant 72 heures (capacit\u00e9)<\/span><\/p>\n

2 017 \u2013 2018 : Calendrier global des travaux de s\u00e9curisation :<\/strong>
\n– F\u00e9vrier \u2013 mars 2017 : \u00e9tudes et r\u00e9alisation du projet d\u00e9finitif des travaux
\n– Mars \u2013 avril 2017 : r\u00e9alisation du dossier de consultation des entreprises et
\nlancement de la consultation des travaux,
\n– mai 2017 : Analyse des offres et passage en Commission d\u2019appel d\u2019offres
\n– juin 2017 : Attribution et notification des march\u00e9s de travaux
\n– juillet 2017 : D\u00e9but de la seconde phase des travaux : pose de canalisation
\nd\u2019adduction d\u2019eau potable, forage d\u00e9finitif et cr\u00e9ation des stations de pompage,
\nmodification au niveau des r\u00e9servoirs
\n– juin 2018 : Ach\u00e8vement des travaux
\n-juillet 2018 : R\u00e9ception des travaux.<\/span><\/p>\n

Le co\u00fbt global des travaux de s\u00e9curisation : 3 610 000 \u20ac HT comprenant<\/strong>
\n– Les travaux de s\u00e9curisation,
\n– Les \u00e9tudes pr\u00e9liminaires : g\u00e9ophysique, qualit\u00e9 des eaux brutes, topographie,
\njaugeages, g\u00e9otechnique, forage d\u2019essais et pi\u00e9zom\u00e8tres,
\n– Les dossiers administratifs d\u2019autorisation,
\n– La ma\u00eetrise d\u2019oeuvre et frais divers<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Suite \u00e0 l\u2019\u00e9pisode de pollution bact\u00e9riologique et virale massive..<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,37],"tags":[3365,5592,5670],"class_list":["post-67783","post","type-post","status-publish","format-standard","hentry","category-a-la-une","category-la-metro","tag-le-gua-et-varces","tag-varces-allieres-et-risset","tag-vif"],"yoast_head":"\nS\u00c9CURISATION DE L\u2019ALIMENTATION EN EAU POTABLE DE VIF, LE GUA ET VARCES -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sillon38.com\/blog\/2017\/02\/02\/securisation-de-lalimentation-en-eau-potable-de-vif-le-gua-et-varces\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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