Faecal sterols, Kuwait, Coprostanol, Microbial water quality, Cholestanols - analysis, Sterols - analysis, Bays, Sewage - analysis, Water Quality, Geologic Sediments - microbiology, Feces - chemistry, Cholestanol - analysis, Escherichia coli - isolation & purification, Streptococcus - isolation & purification, Geologic Sediments - chemistry, Water Pollution...