1) The document discusses a study measuring the effects of agricultural runoff on water quality in the Chao Phraya River in Thailand. Water samples were taken from upstream, at an agricultural runoff site, and downstream to test pH, turbidity, phosphates, and nitrates. 2) The results showed little difference in levels across the three sites, contradicting the hypothesis that agricultural runoff would increase levels. Phosphate levels were unexpectedly zero at all sites. 3) Possible sources of error included rushed testing, lack of equipment cleaning between samples, and an upstream factory that may have affected baseline levels before agricultural runoff. The water quality overall was considered normal.