Agenda - Council - 04/14/2020 - Laserfiche WebLink

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City of Ramsey Project B2001583 March 5, 2020 Page 2 ■ Plan and Profile Drawing of Variolite Street from Trott Brook to 169th Lane prepared by the City and dated February 14, 2020. ■ Cross Section of Variolite Street from Trott Brook to 169th Lane prepared by the City and dated February 21, 2020. ■ Photographs of the patch area provided by the City with no date or time stamp available. ■ Communications with the City. Observations Based on our review of the background information and reference documents listed above, we have made the following observations. ■ Based on our review of the soil borings and laboratory testing previously performed by NTI, it appears the soils present directly beneath the apparent aggregate base are variable, and range from poorly graded sand to silty sand with percent passing the #200 sieve ranging from 3 to 15 percent. ■ Based on our review of cross sections of the study area, it appears the ditches coincidental to the subject 200-foot section of Variolite Street are relatively flat and almost non-existent with adjacent grades extending to the road surface. It is a possibility that the compromised ditch within the study area may have been a result of the construction related to the patch work previously conducted in 2015. ■ After reviewing the photographs and the cross sections, it appears the patch area is retaining a significant amount of water within the aggregate base and subgrade soils. This may be the result of a bath -tub like condition where the aggregate base and subgrade soils are not allowed to drain water downhill due to increased silt within the subgrade soils. Additionally, it appears that water drainage is limited laterally by a lack of day lighted subgrade materials extending to the current relatively flat ditches that are in close proximity to the pavement surface in this area. BRAUN INTERTEC