Mob work NOCs Unit range system updates Gujarat company The NOC Mail id entities services The CGWA benefits watchdog education commitment Water Audit Observation Resistivity conservation vital resource sustainable use allegianceindia overexploitation regulatory mechanism sustainable practices Allegiance Enterprise groundwater extraction Geohydrological Survey No Objection Certificates Geo Physical Investigation Allegiance Water Management sustainable water management positive client testimonials CGWA NOC Consultancy Service Central Ground Water Authority rainwater harvesting techniques Environmental Impact Assessment