1. Salinity Guidance Presented by: Nicole Adams, PE Plum Creek Wastewater Authority

2. WHAT’S THIS ALL ABOUT? The joint reuse committee for AWWA and RMWEA working together to resolve issues related to reuse.The joint reuse committee for AWWA and RMWEA working together to resolve issues related to reuse. General desire to expand and ensure the longevity of reuse application.General desire to expand and ensure the longevity of reuse application. Water quality issues related to salinity and its affect on plants.Water quality issues related to salinity and its affect on plants. Apparent need to investigate landscaping BMPs to accommodate the saline nature of reuse water.Apparent need to investigate landscaping BMPs to accommodate the saline nature of reuse water.

3. Salinity Subcommittee Subcommittee Members:Subcommittee Members: –David Carter, City of Westminster –Jenny Fafita, City of Westminster –Steve Lohman, Denver Water –Dr. Yaling Qian, CSU Dept. of Horticulture and Landscape Architecture –Scott Lehman, Rangeview Metropolitan Districts –Steve Fischer, Tetra Tech EM Inc –Yours Truly

4. Results Study at CSU: Management Options for Mitigating Sodium Stress in Recycled Wastewater Irrigated Turf grass Systems.Study at CSU: Management Options for Mitigating Sodium Stress in Recycled Wastewater Irrigated Turf grass Systems. Landscape Mitigation Guidance to be posted on the WebLandscape Mitigation Guidance to be posted on the Web

5. Study Summary Directed by Dr. Yaling Qian from CSUDirected by Dr. Yaling Qian from CSU In its 2 nd Year. 3yrs TotalIn its 2 nd Year. 3yrs Total Objective of Study: To compare the effectiveness of several different management options in reducing soil sodium content, improving turf grass growth and quality, and increasing soil aeration and percolation.

6. Study Progress From greenhouse experiment: Soil texture appears to play a dominant role in experiment. Sandy soils appear to exhibit much greater turf grass quality under reuse irrigation. Clay soils tend to have poor trigrams quality under reuse irrigation.From greenhouse experiment: Soil texture appears to play a dominant role in experiment. Sandy soils appear to exhibit much greater turf grass quality under reuse irrigation. Clay soils tend to have poor trigrams quality under reuse irrigation. After several months of study cores treated with calcium chloride exhibited better turf quality than gypsum treatment and mycorrhizal inoculation.After several months of study cores treated with calcium chloride exhibited better turf quality than gypsum treatment and mycorrhizal inoculation.

7. Study Progress Results from field experiment:Results from field experiment: During mid-summer months humate treatment had higher turf quality than the control. Several months after initiation of the experiment, plots treated with calcium chloride exhibited better turf quality than gypsum and gypsum+humate treatments.During mid-summer months humate treatment had higher turf quality than the control. Several months after initiation of the experiment, plots treated with calcium chloride exhibited better turf quality than gypsum and gypsum+humate treatments. Final results will be available for public review.Final results will be available for public review.

8. Landscape Mitigation Guidelines Covered various topics:Covered various topics: –Drainage, Salinity tolerance of plants, baseline studies, and limiting source generation. –Plan to launch guidance in September on RMWEA website under the joint reuse committee page. –Draft version attached.