21. There was no city water works, so all depended on shallow wells , which were strongly alkaline. 22. There were many shallow wells and 23 windmills. 23. Microbial metabolism undoubtedly worsens environmental arsenic problems by releasing arsenite into drinking water, including shallow wells . 24. Good for shallow wells with moderate pressure differences. 25. For businesses or homes with plenty of land, one option is to dig many relatively shallow wells . 26. Based on the study, Quezon is classified into two categories namely : deep and shallow well areas. 27. The third type of plate had more shallow wells that often mimicked the look of a shell. 28. The shallow wells will receive the water from Heelerheide that has meanwhile been used for heating buildings. 29. Its decay produced gas that could be tapped in shallow wells and used for some domestic purposes. 30. Reservoirs and shallow wells , the report said, could have been tainted by surface water during the rainy season.
