الفهرس 
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Abstract
The study area lies within the northwestern portion of Sinai peninsula located between latitudes 30° 40′ & 31° 05′ N and longitudes 32° 20′ & 33° 00′ E with an approximate area of 2500km2.
The present work is focusing on the groundwater evolution on the basis of different parameters including the pollution sources in the study area. The study is based onthe hydrochemical, isotopicand microbial investigations of both surface and groundwater samples.The hydrogeochemical modeling was used in investigating the physiochemical processes and water-rock interactions that control groundwater composition in the study area, while trace, heavy metals and microbial investigationwere usedin assessing groundwater pollution situation.
Groundwater samples in the area wereclassified according to its origin as 78%meteoric and 22% marine,the majority of groundwater samples belong to the more advanced grade of metasomatic sequence (Cl-> SO42->HCO3-).
Groundwaterismainly polluted with respect to aluminum, boron, chromium, cadmium, lead, vanadium &zincand safe with respect to cobalt, copper, manganese, molybdenum nickel &strontium. Mixing phenomena reflected the impactof El-Salam canal and its tributaries on the groundwater quality in the study area. Using water quality index (WQI) CCME.Model and microbial detection for groundwater samples in the study area, it is clear that,the groundwater is unsuitable for drinking uses, most of the groundwater is excellent - good to fair for livestock purposes, The majority of the groundwater is unsuitable for using in some industries, most of the groundwater isexcellent for building purposes and the majority of groundwater isfair for irrigation purposes.