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Home My WebLink AboutSoils evaluation for subdivision approval-1978 l � ti � • i � � �� .. �� _ Report On Site Soils Evaluation —� f or � � Subdivision Approval - � ;, Mrs. Roy Hollander Orono, Minnesota �� . - J � ---� Prepared By ^ � Eugene A. Hickok and Associates Wayzata, Minnesota � � August, 1978 �. �i , �. �_ c �- 'i � .� , . I . INTRODUCTION AND SUMMARY � We have completed a program of percolation testing for the pre- � liminary plat proposed by Mrs. Roy 8ollander. The legal descrip- tion of this parcel of land is: That part of government lot � 3 section 25, T 118, R 23 lying southerly of the centerline of � County Road 6 and which lies westerly of a line drawn north _� perpendicular to the south line of said government lot 3 from a � point thereon distant 493.00 feet west of the southeast corner of said government lot 3. Also that part of government lot 4 � section 25, T 118, R 23 lying southerly of the centerline of County Road 6 and which lies easterly of the easterly line of � RLS 1281 according to the registered land survey thereof. _] The proposed lots were found to have soil conditions suitable for on-site sewage dfsposal systems. � II . SCOPE OF TAE TESTING PROGRAM � The scope of this testing program fs intended to fulfill the � City' s requirements for subdivision plat approval. It will also result in percolation tests sufficient for building permit _� application and the c]esign of inclividual on-site sewage dispo- sal systems. Testing was performed in accordance with the � applicable City ordinance and the requirements of Hennepin � County and the State of Minnesota. We began our work by studying the Hennepin County soils survey � report to determine the location of the soils most suitable for on-site sewage disposel systems. We also studied the proposed � lat and to ra hic ma to d t rm'n h ' p pog p p e e i e ow the locations of the � -1- � • � ��` .�. i �� • t ' homes, wells, and drainfields would best be located on each � lot. These proposed locations are shown on Figure 1 and are ..,� considered preliminary. At the time that building permits for �, each particular lot are applied for, ,�inal locations of these s � site features will be set; of course, the drainfields must be -' constructed on the locations tested unless another test is —� made. -"' Our field work included drilling six percolation test holes and �� three soil borings for each lot. All field work was done on � August 10 and 11, 1978 . All of the percolation test holes � � were six inches in diameter and all were three feet deep � except for Lot 1 , Block 2, which was 1 .5 feet deep. Each of T" the soil borings were one inch in diameter and eight feet � deep. As each hole was drilled, a record was made of the I � soils encountered. All of the soils information which we � developed was saaea to that of Hennepin Soil and Water Conservation District and a revised soils map was prepared for � the site. The depth to the water table was recorded when encountered. Percolation tests were performed in accordance ._,] ' '`; with WPC 40 of the State of Minnesota. � the test are discussed for each lot . The details and results of separately below. _ � � .'�� ; 4.�w Y.; , �;'+;� � r, �l -2- � �. ., , . f, �� .� .-'� �.I`-� t ► Block � � � Lot 2 �•. �... ,. The soils found on this lot include Aay.�en loam (18-298 ) and the �� Heyder complex (12-188) . These soils are mapped in Figure 1 . Soil borings indicate that the water table is at a depth of 6 .0 � feet or greater. The percolation rate for the primary field as � tested was 8 .4 minutes/inch. The percolation rate for the � secondary field as tested was 3 .6 minutes/inch. The location of � the percolation test holes, soil borings, and the proposed ''� drainfield areas are indicated in Figure 1 . Percolation rates � and depths to the water table are shown in Table 1 . The soil �� logs of the soil borings are shown in Table 2 . 1 Because of an acceptable percolation rate and because of an ade- � � quate depth to the water table a conventional treatement system _� is recommended for both the primary and secondary sites of Lot �' 2 . This recommendation applies only to the areas showrt in °� '� F i u re 1. ' k' g �� S � ,.r'� rti' !,_� 7` �8� ry 1' ,__ � . � ' � IV. OVERVIEW OF RESULTS All of the lots had soil and site conditions which are suitable �„J for on-site sewage disposal . The tests were located at what we consider to be the best sites for the construction of the drain- � fields. This is not to say that other sites are not suitable. _� It is recognized that as homes are built on the lots, other sites may be desireable for various reasons . This report can be �] used as a guide in evaluating other sites on each lot, of course another percolation test would be required if another site were ' � proposed. J Stated percolation Yates are averaged for the location shown, _� and no guarantee is implied or expressed that these conditions exist for the entire area. .�-� � � i y J __ ] _� � �� r� _�_ . J � �:_ �.� � -��- _J 'a.. � ._ � � TABLE 1 (Continued) L Block � Lot 1 - Percolation Rate Depth to Water Table : Hole (min/inch) ( feet) pl 48 .0 --- , p2 120 .0 ___ p3 120 .0 --- p4 60 .0 --- J PS 120 .� --- p 120 .0 6� Sbl --- 2�L 1 S b2 =_= 2� S b3 1 Percolation rate of primary field (holes 2 ,3,4,5 ) = 96 .8 min/inch Percolation rate of secondary field (holes 1 ,2,5 ,6 , ) = 85 .7 min/inch 1 1 � �....a _ .�_.�� .:�� Block � Lot 2 _ �v_.._. : _ ._.�; - ��•'�� 1 Percolation Rate Depth to Water Table ` J � Hole (min/inch) ( feet) � pl 5 .7 --- p2 20 .0 p3 5 .7 --- p4 6 .7 � p5 5 .7 --- p6 13 .3 * Sbl --- * l Sb2 --- * � Sb3 � Percolation rate of primary field (holes 1 ,2 ,5,6 ) = 8 .4 min/inch -- �' Percolation rate of secondary field (holes 2 ,3 ,4 ,5, ) = 3.6 min/inch � � � *The water table was not encountered over a 24 hour period —1 � . 7�� .,.._ �.��_ _ �_ � � t_ �,��_.�,_ 14 _ _ � F� TABLE 2 ( continued) Block � Lot 1 S bl .. Depth Material - 0 .0-2.0 Grayish brown loam 2 .0-8 .0 Grayish brown clay, with some sand mottling at 6 .3 ' The water table was encountered at 67/� feet after 24 hours . p S b2 pepth Material 0 .0-1 .0 Grayish brown silty loam � 1 .0-1 .5 erownish gray clay loam . 1 .5-7 .5 Olive brown clay, with some pebbles, mottling at 2 .5 ' The water table was encounterec3 at a depth of 27,� feet after a ' 24 hour period. ' Sb3 " Depth Material � 0 .0-0 .9 Grayish brown silty loam � R 0 .9-1 .8 Light brown clay loam 1 .8-8 .0 Yellowish brown till , mottling at 2 .3 ' � The water table was encountered at a depth of 2� feet after a 24 hour period. .- ._ , _ , , �__..__-.�.�,�_._... ,....� _.__ .._ _._.__,____. ,. �•.�:.�� .��.�., ��:.�.� _ �,,. � �� 1 � Block � Lot 2 � Sbl -, pepth Material ' � 0 .0-1 .0 Grayish brown sandy loam � 1 .0-4 .0 Yellowish brown sandy clay ,� 4 .0-5 .0 Yellowish brown clayey sand t 5 .0-8 .0 Sand and gravel The water table was not encountered over a 24 hour period. 1 �� -19- ,-,.�� . , . .,� � „� . : - ,.�:.� � :.,.�,. � � . _ --��" TABLE 2 � � , :.. . ( continued) � � Block � Lot 2 (cont. ) �r S b2 �§. � . Depth Ma�erial � �� '�� _ 0 .0-1 .0 Grayish loam 1 .0-8 .0 Sand and gravel � The water table was not encountered over a 24 hour period. � � gb3 _._ - �epth Material _ - 0 .0-8 .0 Sand and gravel �- -- The water table was not encountered over a 24 hour eriod. P � � Block Lot 3 � Sbl .m" Depth Material ,�- .. 0 .0-1 .4 Brown sandy loam -- 1 .4-8 .0 Reddish brown sand . "�' The water table was not encountered over a 24 hour period. .; � _ _ � Sb2 �: � Depth Material 0 .0-1 .0 Dark brown sandy loam � - 1 .0-3 .0 Reddish brown cla e s n � 3 .0-8 .0 Reddish brown sand y a d �� The water table was not encountered over a 24 hour period. �� Sb3 4:. � Depth Material � � 0 .0 1 .0 Brown fine sandy loam �`� � 1 .0-1 .7 Reddish brown clayey sand " 1 .7-8 .0 Sand and gravel t The water table was not encountered over a 24 hour period. , .: -20- F , � �, . � \ -� / �' • � . , � � ��- ��7 � N � Z�p o 'a/ Zod � \ o � �6 ��i i / \ �1 ` S8'� 2� �`� \P�O z � � \ �� d 3 � ,� q,1� R � --. 1._� ��o � � � \ � �3 � / �i/`L s �\ ,z � � ��' - �Q P S�� ,�. - � 3 P5- Z1S . � o� C �� . / ` �� ` �,q G'� z�s � � � �� C �ti � � �90 q�- �c� . � �� s , �S oq ,�� , � � � ,, � � � , . . � N�� 6