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Water samples were collected monthly from five wells (P1–P5) over 1 year (February 2011–January 2012). The Lambert coordinates of these wells were 29 ° 43′ 47″ N, 9 ° 43′ 52″ W (the P1 well/24 m); 29 ° 43′ 0″ N, 9 ° 43′ 52″ W (P2/22 m); 29 ° 43′ 0″ N, 9 ° 43′ 48″ W (P3/26 m); 29 ° 43′ 38″ N, 9 ° 43′ 41″ W (P4/23 m); and 29 ° 44′ 4″ N, 9 ° 43′ 54″ W (P5/24 m) (Table 1). In choosing these five sites, the frequency of water use by their owners and their geographical distribution around the wastewater treatment plant was considered (Figure 1). For each sample, before starting sampling, the pump spout was heated with a gas torch, and then the pump was left to run to obtain a true sample of the well water. Each sample was placed in a 500 mL sterile bottle according to the Moroccan standards (Norm 1997). Immediately after sampling, the bottles were labeled (date, number of the well, type of analysis) and placed in the dark in an icebox at 4–6 °C before being transported to the laboratory for analysis on the same day.

Table 1

Characteristics of the studied wells

WellGroundwater levelsType of wellLambert coordinatesLocation/Treatment plantType of use
P1 24 Dug well 29 ° 43′ 47″ N Upstream Consumption, irrigation 
9 ° 43′ 52″ W 
P2 22 Dug well 29 ° 43′ 0″ N Upstream Consumption, irrigation 
9 ° 43′ 52″ W 
P3 26 Dug well 29 ° ° 43′ 0″ N Upstream Irrigation 
9 ° 43′ 48″ W 
P4 23 Dug well 29 ° 43′ 38″ N Downstream Irrigation 
9 ° 43′ 41″ W 
P5 24 Dug well 29 ° 44′ 4″ N Downstream Irrigation 
9 ° 43′ 54″ W 
WellGroundwater levelsType of wellLambert coordinatesLocation/Treatment plantType of use
P1 24 Dug well 29 ° 43′ 47″ N Upstream Consumption, irrigation 
9 ° 43′ 52″ W 
P2 22 Dug well 29 ° 43′ 0″ N Upstream Consumption, irrigation 
9 ° 43′ 52″ W 
P3 26 Dug well 29 ° ° 43′ 0″ N Upstream Irrigation 
9 ° 43′ 48″ W 
P4 23 Dug well 29 ° 43′ 38″ N Downstream Irrigation 
9 ° 43′ 41″ W 
P5 24 Dug well 29 ° 44′ 4″ N Downstream Irrigation 
9 ° 43′ 54″ W 

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