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HomeMy WebLinkAboutseptic info F ' •� SEPTIC SYSTEM INFORMATION ��H�� I�E� N�� �EEI� STREET ADDRESS M�CROFILMED JON N�Tt�tiS' �,�✓c ff /...4kg LOT � BLOCK � SUBDIVISION S�«�� /�-7�7.�%T70� MONTH AND YEAR TESTING DONE aL���� �9�0 ITEMS ALREADY COMPLETED _ � f'�� �STS , � $o��tiG-S NEED TO COMPLETE BEFORE ISSU�ING BUILDING PERMIT ; OBORINGS OPERC TESTS SYSTEM DESIGN �x J SITE PLAN j�x O OTHER � � � �� � �� � �/��� .�/ • SUBDIVISION FILE NO. ��� / DATE THIS SHEET FILED � "����5� BY �'C � � TNIS ITEM ��S �EEN -� � MI�ROF'ILMED SIT� EVAI.,U:ITION R�PORT ' i�'OR HARRISON R. JQHi15TON, JR. ORONO, MINNFSOTA 10-22-80 During October J.7-22, 198� all five proposed lots in the sub- division of Harrison Joh.�ston, Jr. were tested for the suitability of supporting on-site drainfiAld sy3terns. �3ix percolation holes were tested on each lot r�nd three soil borin�� taken on eacl� lot to determine botil� primary and alternate drainfield sites, ihe percolation holes were dug 6 inches in diar��eter to the 4 foot depth except the altornate site on lot 1, block 2 where holos 5-6 were dug 2 feet de��� to test for a sha�.low trench system. The holes were dug with both po�rer and hand augers. The soil borin�rs were du� t•rith hand au�ers and were � iriches in diameter to the !� foot depth and 3 inche9 in diameter to the re- n�aining depth, Some very permeable soils were found on most lots aric? all lots ��ad sufficient percolation rates to qualiry for atan- dard drainfield systems, The alternate sits on lot 1, bloak 1 will require shallower trenches to avoid the water table. �Irhe trenchea on the primary site of lc�t 1 , b].oak 3 will also need to be aonat- ructed fairly shal] ow an�l an interceptor drain should be used to divert runoff water from this site sinae the lot is bowl shaped � and collects runoff water. � Hetter soil was enaa�untered shallower on the alternate s te • of 1 hould be ua d In lot 3 of block 1 a pump will probably be needed aince the best soils exist on top of the hill. A so mig e necessary to use pumps on other lots depen ng � th8 placement of the houses. Additiona�. design inforn�ation for tY::e individual houses will bo needed prior to construction. It is impe .rative that thase tested area not be � disturbed since there are some steep sidehill slopes on some lots ancl 3ome prohibitiva soils and water tab_i. :. near t��= marshes which may r_,reclude an9 other areaa being used #'or drainfie�ds, If any additional inPormation is ne�ded, please contaat me. � ... i - � -- TNIS ITEi� HAS ���� JO;ii'��`.�'0;1 PROP,.RTY MICROFILMED LU't' 3, I�l.���.ii 1 . � co zt3.on I�esults -�o� c lio. I�:ateri�zl Perco_l�tion Rate I'-1 Lt, II-rn. i�ine Sand 1.7 I�.in. linch P-' Lt. Brn. 1�'ino �and 1,4 P-� Broti��n Loamp Sand 2. 2. �'-t� Broi�rn i:oaar,y �3and 2.,�', y-> Brown Loariy Sand 2.4 Y-6 T3rotan Loar,:y Sa,11d 2. 0 Th� avc�, p�3rcc�l�t� or. rate for h�].es 1-�.(pz•iinary ::,itQ) = 2.0 T�,PI. '1'ha av�;. p�rcolat� on rate for holns �-6(al t, si te ) = 2, 2 A:PI. Soil Borin�;s L :i � , r , Depth(ft, ) r�i�t` 0. 0-1.3 Blacl; Loar1 1. r-2.0 Gray ?3rn. Sandy T,oam �.�-5. '� 13r�wn Fin:. Sgnd ��.�-7.S I.i te Browr.i Fine Sand �i�.5-�. � Lt. IIrown Fine Sand, Powdery ido mottled �oil or wator table a.fter 2L� hours. � -, :� . , -, � ' Depth(ft, ) r:aterial ______.___,._ 0. ��-1. �, Black I,oam 1.5-2.5 , i�ray Brn, Sandy Loam � 2.5-,�.0 Brown Fine 3and �. 5-�.5 Gray Brn. :Fine Sarid >.5-8,0 Lt. Brown :E�ine Sand No mottleci soil or water table after 21� hours. " :_ 3 J� � !�• i�on tn rt, r:A.t� 0, 0-1,0 Bl ack Loam 1, 0-2, 0 Gray B�n. ;3andy Loam 2. 0-4.0 Brown Loam�� Se,rid 4.0-7, 0 Gr�y Brn. F�ine Sand 7. 0-E�,0 Lt. Brn, Fj.�e 5and, Powdezy , ia-� .. ,a �.,� 1 ,-,» ..rnfn�. �- -,L.� � _ �� , ..� „ , . , � �,�".�`�,,.;.: . �, . � S.stL � 7,scr 0 �H(S ITEM �IAS BEE�! � — — �r =Y �--— — � IH�CR4f IIMED � - 5e ' s� --- . - � �/�\\ � '' � \ ,L'' r.P� � ` � � � �`� � h _ ,, , \l, t y 4 .. ~ w � . . 7' w� � �S , v � . N � � �1... , 4 � .. h , a �� � � ' . � � . � -- � o � ,� . -z� '� ��,\ s� � �n�\ . e.� � o c��. .° M � ,, � o�a . e e T o "'- \ . � �f t'1 ' � G � . �`� � i.�( �j � ry 4 `�. �iT� 1 a K , ♦,O� I w .r ' \� 4��'� Q' '�s ` . / � � T � s`. ' d i � � 3 • s, a , � ' ' . � � ;' ,� o�' �� — �-- — -r �'�"�.'��Y ^ — m , / ��_� _ _4�2� _ U 2 � � e ti� _ � _ ~�c 0 'l6�. �.. 4�v r��',�' �`-> �''d��_ �, J � Q _ �� I J°� ���� '� d , m M / � � t O A � � � . i -�- � ^1 .J . . � .. ��t u i ^ ^ . H ,. �v � . � � ; O j, � \ ,p N tJ C � . . � . . ` � . � \ � \ t � � i V V � � , 3` , �--� , y . . . �;� � £z9 .�;[q,oN n1„o�,co,oy : � \ « �$ � , . °' �,° � - �— — — � -o � __ r,as� .,.�. . ' , �1(�0 . �_ _ •M _ � r���� ^�s T�`� ♦ � . \ � / � a; \ —ie��h - - � .. � �- �acoi G' i�2�; - w �_� � V wv � ^ � � � • w X S � l�b < N �� � �!. *'� u t ' ' �O .co PR,I� ,• � � .� - �_ � ao �- h � : P�`�r /�1., .��00 N — — — '� — � 1�/ � ,. T �b� . h � � � V� � ' e Q :`i w h ` \ . ItEM l�AS B�ER - TN1S � . � �� � � � ��� �. � ] ',y. c. ^� l�����,. ,� s ", .� =�..a,� . � ��� _ �,� �� �� :: .� ��1 .� ���. TO: Jeanne Mabusth, Zoning Administrator FROM: Michael Gaffron, On-Site Systems Manager DATE: October 30, 1980 SUBJECT: #582 H. R. Johnston, 925 W.illow Drive South - SUBDIVISION On-Site Systems Review On October 28 , 1980, I reviewed the five proposed new building sites for the above referenced subdivision as per the attached survey. Each lot (save Lot 4 , Block 1 with e�cisting house) appears to have 2. 0 acres of dry buildable land. However, due to proximity to adjacent wetlands and the accompanying water table a portion of each lot is unsuitable for use as drainfield. All lots had areas tested which meet the requirements for standard trench drainfield systems . These designated tested drainfield areas on certain lots are the only available acceptable sites for drainfield. In every case, assuming a long term water table exists at approximately the 930 ' elevation, no drainfield trenches (2 ' depth standard) should be allowed below elevation 935 ' in order to ensure a 3 ' separation between trench bottoms and water table. In addition, where individual lot testing indicates a water table depth, the above 3' separation must be adhered to. Following is a detailed review of each lot. Lot 1, Block 1 Testing indicates soil and water tabZe conditions are suitable for a standard trench drainfield system. This lot has some alternate house location possibilities. However, the tested site and in fact the entire lot should be left undisturbed until a final house location is determined. Lot 2 , Block 1 As in Lot l, testing found sandy soils suitable for a standard drainfield system. Various house locations may be possible. An excavation crossing the lot has not severely damaged drainfield arezs, but no further excavation or disturbance should be allowed until final house location is determined. Lot 3, Block 1 This is probably the most critical lot of the subdivision in that a limited area is available for use as drainfield. The tested area is at the highest point of the lot due to extreme slopes. An excavation near the northwest corner of the lot may have affected the extent of the area available for drainfield. �By creating an outlet for sidehill seepage from trenches above the excavation. However, due to the extremely fast percolation rates and sandy soils an the existence of untested but probably suitable area for drainfield to the east on the lot, the effect of this excavation is only slight. .- S�� �°, � � T�lIS ITEM �IAS B � EEH �x� October 30, �9go MICROfIIMfD #582 H.R. Johnston • 925 Willow Drive South Page 2 Lot 3, Block 1 (Cont. ) When this lot is developed, care must be taken to make sure the house location does not encroach on the area to be preserved for drainfield. I suggest that for this lot (and for ali subdivisions in the City) that the tested drainfield sites be somehow entered on the title or deed for the property so that prospective buyers are made aware of the restriction on the lot. Lot 4 , Block 1 This lot contains the existing H. R. Johnston home. Although the lot as proposed contains only 1. 64 acres, adequate area has been previously tested and exists for use as future drainfield. A relocation of the lot line between Lots 3 and 4 to give each property approximately 1. 8 acres would serve no purpose as far as drainfield sites are concerned. Lot l, Block 2 The soils on this lot are considerably different than those of the westerly lots. Loam and clay loam soils are indicated, and the percolation rates were understandably slower. This lot contains 2. 4 acres and has a somewhat limited number of possible house locations which would allow a gravity-flow drainfield system. The lot is acceptable for a standard trench drainfield. Care must be taken during development of the lot that drainfield trenches are kept away from the pothole in the center of the lot. Lot l, Block 3 This lot has loamy soils with a fairly good percolation rate. The tested drainfield sites are to the immediate southwest of the existing paved driveway and due to slop� condi.tions appear to be the only likely sites for use as drainfield. Again, care must be taken to preclude disruption of these sites prior to development. It appears that the suggested location of the house would be on the north end of the lot approximately on the existing driveway. Summary Each of the five proposed new lots should be acceptable for standard trench drainfield systems. Fortunately, this is one of the few areas of Orono having sandier soils. Certain lots as indicated may have limiting sites due to water table and slope constraints. As the engineer' s report states, it is imperative that the tested sites not be disturbed by further excavation, grading or filling until permits are issued for specific house locations. I recommend approval of the subdivision as per preliminary plan with the above recommendations . ; _- ..�, J� 1 h � ;,J ._.'��.� ` ', � m �_�.. ► � N/ Z Z J W Q . . v ,;��\ � •� � ``1 \ tl � � r � `� ;�. F Q � TN�S ITEM HAS �EEN —__�� �: b �m � � MICROfILM�� ; , � � o- � � � , � �z �� __ � � 3,0 E e ZN : tEZ —� C059L / � �. 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