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Cl Introduction.  1 Purpose of this report- 1 Location of the area 2 Acknowledgments.  3 Recharge wells 4 Recharge well l-_- 4 Accessory equipment. 6 Summary of recharge tests 9 Recharge well 2 9 Accessory equipment 13 Summary of recharge tests_ 15 Hydrologic instrumentation and control  15 Observation wells 15 Water meters 16 Measurement of atmospheric pressure  17 Water-quality instrumentation and control 17 pH and residual chlorine.  17 Turbidity.  17 Temperature. _  18 Micro-organism counts. 19 Millipore filter.  19 Coagulant testing. 19 Bacteriological sampling and testing  19 Sampling wells. 21 Water-treatment equipment and procedures 21 Water supply. 21 Micro-organism control 21 Coagulation__ _  24 Settling basin_  26 Chlorination_  28 Filtration 28 Clear well._-__-_---_-_--__-_-___-_-_--_-___-_-_---_--__ 29 Supplemental equipment and controls. 31 Testing seasons 31 Timing of observations and note keeping. 32 Specific-capacity tests.__-_---__----_--_--__---_ 32 Project layout. 34 Conclusions._ ___-__ 35 References cited-_--____--___39

Equipment and controls used in studies of artificial recharge in the Grand Prairie region, Arkansas