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E}:1i:51T <br />TO: Jeanne A. Mabusth, Zoning Administrator <br />FROM: Michael P. Gaffron, Septic System Inspector <br />DATE: January 5, 1982 <br />SUBJECT: Ringer Subdivision, North Willow Drive 4,615 <br />Summary: All proposed lots were found to have high water tables, <br />necesuitating the use of mound systems. Percolation rates in the <br />uppar soil profile generally were suitable for round systens, <br />with slower rates found in deeper test holcu. Slopes on thn entire <br />site are fairly level and suited for mound systems. <br />This report will consist of: a) a short review of each lot of the <br />proposed division and b) a discussion of mound systems,including <br />how and why they work and their current and future use as part of <br />Orono's land use managem=nt plan. Tile Ringer subdivision is <br />parhap:; the most c;(tensive development in Orono to date that will <br />require all mound systems. <br />A. Rinnor Subdivision <br />A prclirlinary revise oc' t113 li iinepill Cbunty Soil purvey indicated <br />e:.tcn3ivc area-, of Cordova silty clay lQu l and "hurc:rood silty <br />clay loam as -ill CO L_,,ccur loan. would Le found"at tiiiu site. <br />These ::oil:, all would b,2 c: Pecs^d t•• have a seasonal waL-cr table <br />Of sztturatiull and 3 fcc:t bolo:, the ;urr"acu. <br />During the COL'Y:,e of ti.e coil ; invcstiratiorl, I mot tui th tiro sito <br />!valuator, Carl Cord. r_nd rczil tur Graydon I:ccullcy oli the <br />sito. Woo mado a bo>• .,g Wa-, Qli definitely indicatcd these high <br />eater table soils were present. I l3tor confiriacd with Dr. James <br />L. Andoroon o2 tho University of Minncoota Soils Mtcnaion <br />Uapartman;; that r,:ound sYotcaiJ would be . appropriatc for thcoo soil <br />typos. Thcuc are much the ,cn: suila as found in the I•:cdina- <br />liorningside area, wilicil es:pericucc conventional trench septic <br />system failures due to ti1c soil couditio,13. In ycricral, the <br />loWay topsoil chara-_:Lc_riutico fur the ►:i+iger prop: rty are suitable <br />for proper functioning of oL•alld:ird prcuuIlrc•-mound septic syutems <br />as par Orono' u Cod;.! and Ucuign I anual. <br />Vor clarit-y'u r:al:c 1 have labclec] thi - nortlicrn most tier cf ;even <br />lots as Bloc): 1, the cicstcrn cgruup of si:: lotu as Ulocl: 2, and <br />the two lots to the ::outhcast• a:; Ulock 3. <br />Lot 1, Dloc]c 1 <br />Peres PD11 thru PLIG. Carings I:D11 thru 131313. Average perc <br />rates for both primary and alternate uiL-uu are acceptable. Slopes <br />are quite level. maturation indications, (mottlincr) started at <br />1.7 to 2.5 feet. Actual water table: i.►t 5-7' depth. A mound <br />syutem should be ur:ed due to the pr(.!;erict: )f ::ha] l��w ;aturatian <br />zon::. <br />