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CCP 07-17-2000
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CCP 07-17-2000
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<br />. <br /> <br />. <br /> <br />. <br /> <br />Final Report Introduction - Arden Hills Water Quality Task Force - June 2000 <br /> <br />.Construction projects and other runoff events in Roseville via Judicial Ditch # 4 have the <br />potential to dramatically affect downstream water quality. Little Lake Johanna is suspected <br />to be a phosphorus catch for a large area of Roseville, which drains through the lake and <br />into Johanna. <br />.AH has many pipes which outlet directly into waterbodies of all kinds with little or no <br />pretreatment, There is little or no protection in several areas from potential spill hazards <br />from freewliYs, state and county roads, whichr~present a significant drainage area_inArden <br />Hills. The locations of some high impact areas are known generally but will require more <br />study to determine specific locations and degree of impact. <br />.The City of Arden Hills has a formal street sweeping policy and uses salt sparingly but does <br />not train personnel in best management techniques for water quality. There are no <br />ordinances that encourage water quality protection other than offered by Rice Creek <br />Watershed Districts rules. Arden Hills as a fully developed city is not completely protected <br />by RCWD rules structured to accommodate development in rural areas. 4 <br />Lakes <br />Water quality in Arden Hills is well understood by Rice Creek Watershed District (RCWD) <br />and Ramsey County for the lakes Johanna and Josephine; however, there are several areas <br />where the data set is incomplete or inconclusive, Baseline data for the smaller lakes, <br />drainage's, and wetlands is not available. <br />The lakes Johanna and Josephine have shown some improvement in water clarity over the <br />last 20 years. (See Appendix - "Trophic States of RCWD lakes" and attached discussion) All <br />lakes in the RCWD tend to have eutrophic' characteristics and as such are sensitive to water <br />quality impacts. A full-scale appraisal of Lake Johanna by the RCWD is scheduled for <br />Summer of 2000.' Weed growth cycles and exotic species have continued to draw the <br />concerns of residents over water quality and need more study. <br />Resources <br /> <br />Arden Hills has a rich legacy of wetlands and flowages that, although degraded, remain <br /> <br /> <br />intact and offer a cost effective solution for repairs and enhancements to our drainage <br /> <br />4 Volume control of stonnwater is a new concept in RCWD rules. The established methods and standards have not <br />developed to a sufficient extent to protect communities that already have a high level of impervious surfaces. " Stonnwater <br />management in the District has historically focused on controlling peak runoff rates and providing water quality treatment <br />via NURP style ponds, The 1995 Volume Study (Montgomery Watson PEl demonstrated that the Districts current Rules <br />and Regulations targeting peak runoff rates are not sufficient to maintain flood stages in several District lakes. Furthermore, <br />without volume control measures, as recommended in the Volume Study, high water draw down times are longer and <br />available storage volumes are filled thus increasing the risk of flooding from the next rainfall." - Memo to RCWD Board of <br />Managers from Derek Knapp PE -Montgomery Watson - 2/2912000. <br />5 Eutrophic _ A description for a body of water where the organic nutrients reduce the dissolved oxygen, producing a more <br />favorable enviromnent for plant than animal life. Other related states are Mesoeutrophic and Hypereutrophic. See <br />Appendix Attachment D for relative comparisons oflake status and discussion. <br />, See Appendix - Exhibit (A) from L3ke Assessment Program Cooperative Work Pian - MPCA. <br />
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