Agenda - Council - 03/12/2019 - Laserfiche WebLink

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Review of Peer Communities Topsoil Requirements Staff contacted multiple communities that are all situated within the Anoka Sand Plain. These comparisons generally have a sandy base or native soils with less water holding capabilities. A summary of each community's standards are attached to this case. Based on this review, it is clear that Ramsey has a much more stringent approach to topsoil. It seems that communities that have adopted a topsoil requirement have done so with an intention of reducing demand on groundwater while also assisting with vegetation establishment. Cost Comparison Staff has also obtained cost estimates from Capstone Homes as part of this request. The information helps illustrate the cost per lot, which is ultimately passed on to the Buyer. The topsoil requirement is applicable to any lot in any district being developed with a new principal building, including those on private wells which still draw from groundwater supply. These costs are representative of the typical residential lot sizes being developed currently. Approximate Lot Size 6,000 sq. ft. (0.15 acres) 10,800 sq. ft. (0.25 acres) 43,560 sq. ft. (1 acre) Estimated Cost of Premium Topsoil Borrow $3,690 $5,740 Estimated Cost of Regular Black Dirt $2,250 $10,660 108,900 sq. ft. (2.5 acres) $19,000 $3,500 $6,500 Unknown Price Difference $1,440 $2,240 $4,160 Unknown Alternatives to Premium Topsoil Specification The present request is not to entirely eliminate the topsoil requirement, but rather to modify it to something more consistent with surrounding communities. This would still provide improved soil characteristics, but at a more cost effective ratio. This could also help address recent concerns raised by homeowners about standing water and spongy areas in backyards when irrigation systems are not adjusted properly. Advances in irrigation technology over the past decade have made it easier and more cost effective to conserve water through better sprinkling habits. Smart controllers can be connected via the internet to current and local weather information and historical data to assist with reducing unnecessary waterings. Also, multiple soil moisture sensors can be utilized in different parts of a yard to ensure that the irrigation system doesn't turn on that zone unless there is insufficient moisture in the soil. These sensors are typically $150 or less. The message coming out of the University of Minnesota's Extension team is that water efficient irrigation systems, not new turf varieties or soil amendments such as topsoil, have become the most cost effective means to reducing non -consumptive water usage. City Code now requires any new irrigation system to have a water efficient technology. However, there are many existing systems that could be retrofitted. This comes at a higher cost than upgrading a new system. While not being proposed at this time, the City could consider developing a rebate program that would provide a financial incentive to owners to upgrade existing systems. Additionally, the City could provide incentives for a simple irrigation system tune-up that would maximize efficiency and provide an educational opportunity for the Homeowner. It may also be possible to find grant funds to establish and offer these rebate programs. Weather/Precipitation/Landscape The largest factor in water usage has always been and will likely always be the weather and precipitation. With newer systems, weather can be factored into the programed run-times. The water usage data from the City does show a clear correlation between reduced precipitation and increased water usage. Additionally, tree canopy cover can also play a significant role in watering needs of a yard. Shady portions of a