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� <br /> . , y.�y� /'/- /� �w,�st„°�„"►(�,.,, <br /> -- '!.� GPL�`.,c...� <br /> ,,�„�..�..•..�w_. <br /> �_.,� � <br /> � �� <br /> �. r � �;���� <br /> S E P �. 6 a�:�` ��� �-;� , (� �` <br /> �t.� <br /> � ,;�' �'� , ����t�. <br /> August 27;$1996 -�� <br /> �'' � ' ,� ,`��t ;�p,>����� <br /> �.. <br /> , <br /> Mr. James A. Abbott '"` <br /> 1000 South Brown Road �"� <br /> Wayzata, MN 55391 STS Project��88�� ' �- <br /> ��,^� � <br /> Re: Prelimin ISTS Com liance Evaluation at 1000 South Brown Road '`�. "'��-� + � <br /> �' P ,, . ,�'���'` <br /> in the City of Orono, Minnesota � �� d. � <br /> "a��-�.,,� � <br /> Dear Mr. Abbott: � �`�'' �� <br /> STS Consultants, Ltd. (STS) performed a preliminary compliance evaluation of the individual <br /> sewage treatment system (ISTS) located south of your house at 1000 South Brown Road in the <br /> City of Orono, Minnesota. The purpose of the preliminary compliance evaluation was to <br /> determine the vertical separatior� between the bottom of the drainfield porticn of the ISTS and <br /> soil mottling. The compliance evaluation was limited to soil descriptions and determination of <br /> the depth to the base of drainfield rock in the two drainfield trenches of the ISTS system. No <br /> evaluation ot the septic tanks or distributiGn devices of the I5TS system was performed. <br /> Sco�e of Work <br /> Three hand auger soil borings were advanced at locations ne�ir the middle of the drainfield <br /> trenches, see Figure l, Appendix. Soil descriptions were made following U.S. Department of <br /> Agriculture - Soil Conservation Service nomenclature (Soil Survey Manual, USDA-SCS, 1981). <br /> Soil colors were determined using Munsell soil color charts. Soil boring logs are found in the <br /> Appendi�. 11�e depth to the base of the drainfield rock in the trenches was determined by <br /> pushing a probe rod through the drainfield rock to the underlying soil. <br /> Results and Discussion <br /> The soil boring logs show that soil mottling was encountered at various depths. Soil mottling � <br /> was observed at a depth of 3.7 feet at soil boring B-1, upslope of the first drainf'ield trench. Soil <br /> mottling was observed at a depth of 7.7 feet at B-? at a location downslope from the second <br /> drainfield trench. Soil mottling was observed at a depth of 6.7 feet at soil boring B-3 located <br /> between the rivo drainfield trenches. The base of the drainfield rock in the first trench was 4.3 <br /> feet below the ground surface at P-1 and 2.7 feet at P-3. The base of the drainfield rock in the <br /> se;,ond trench was at a depth of 2.� feet at P-?. No sewage effluent was observed in any of the <br /> testholes performed. These results, converted to elevations, are tabulated on Figure 1. <br /> STS Consultants Ltd. <br /> Consulting Engineers <br /> 3650 Annapolis Lane <br /> Suite 120 <br /> Minneapolis, Minnesota 55447 <br /> 612.559.1900/Fax 612.559.4507 <br />