1. Soils Data Summary

2. Stormwater Management: LID Practices | 2 Soil Phosphorus Levels

3. Stormwater Management: LID Practices | 3

4. CatchmentVery LowMediumHighVery High A33%0%56%11% B0%14%29%57% C14%0%29%57% D0%40%20%40% E0% 100% F0% 40%60% G29% 14%29% Grand Haven13%10%27%50% 77% of soils tested do not need any phosphorus fertilizer

5. Stormwater Management: LID Practices | 5 Fill and Soil Quality Fill Material pH = 7.3 leachable P = 77.7 + 52 ppm Fill Material pH = 7.3 leachable P = 77.7 + 52 ppm Native Soil pH = 5.0, leachable P = 1.4 + 0.5 ppm Native Soil pH = 5.0, leachable P = 1.4 + 0.5 ppm Common space landscaped soils pH = 7.3 Mehlich 1 P = 80.9 + 48 ppm Common space landscaped soils pH = 7.3 Mehlich 1 P = 80.9 + 48 ppm Residential landscape soils pH = 7.3 Mehlich 1 P = 93.5 + 34 ppm Residential landscape soils pH = 7.3 Mehlich 1 P = 93.5 + 34 ppm

6. Stormwater Management: LID Practices | 6 Soil Phosphorus vs. Copper Sulfate Treatments

7. Stormwater Management: LID Practices | 7 Summary Soil phosphorus test indicates most soils do not require phosphorus fertilizer. Phosphorus levels in some fill soil are very high and significantly higher than native soil P. Soil phosphorus and frequency of copper sulfate treatments are weakly correlated.