procurement of specified river sand for mortar , concrete and black sand for trench , plinth filling for construction work against various scheme within bishalgarh, charilam , jampuijala, boxanagar ,mohanbhog, nalchar , kathalia r.d block under r d b procurement of specified river sand for mortar , concrete and black sand for trench , plinth filling for construction work against various scheme within bishalgarh, charilam , jampuijala, boxanagar ,mohanbhog, nalchar , kathalia r.d block under r d b , any worksite within the bishalgarh block area. coarse sand (for mortar / concrete ) , any worksite within the bishalgarh block area. blacksand (for trench / plinth filling) , any worksite within the charilam block area. coarse sand (for mortar / concrete ) , any worksite within the charilam block area. blacksand (for trench / plinth filling) , any worksite within the jampuijala block area.coarse sand (for mortar / concrete ) , any worksite within the jampuijala block area.blacksand (for trench / plinth filling) , any worksite within the boxanagar block area. coarse sand (for mortar/concrete) , any worksite within the boxanagar block area. blacksand (for trench / plinth filling) , any worksite within the mohanbhog block area coarse sand (for mortar/concrete) , any worksite within the mohanbhog block areablacksand (for trench / plinth filling) , any worksite within the nalchar block area. coarse sand (for mortar/concrete) , any worksite within the nalchar block area. blacksand (for trench / plinth filling) , any worksite within the kathalia block area. coarse sand (for mortar/concrete) , any worksite within the kathalia block area.blacksand (for trench / plinth filling)