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Home My WebLink AboutISTS compliance evaluation � . , y.�y� /'/- /� �w,�st„°�„"►(�,.,, -- '!.� GPL�`.,c...� ,,�„�..�..•..�w_. �_.,� � � �� . r � �;�� S E P �. 6 a�:�` �� -;� , (� �` �t.� � ,;�' �'� , ��t�. August 27;$1996 -�� '' � ' ,� ,`��t ;�p,>�� .. , Mr. James A. Abbott '"` 1000 South Brown Road �"� Wayzata, MN 55391 STS Project��88�� ' �- ��,^� � Re: Prelimin ISTS Com liance Evaluation at 1000 South Brown Road '`�. "'��-� + � �' P ,, . ,�'��'` in the City of Orono, Minnesota � �� d. � "a��-�.,,� � Dear Mr. Abbott: � �`�'' �� STS Consultants, Ltd. (STS) performed a preliminary compliance evaluation of the individual sewage treatment system (ISTS) located south of your house at 1000 South Brown Road in the City of Orono, Minnesota. The purpose of the preliminary compliance evaluation was to determine the vertical separatior� between the bottom of the drainfield porticn of the ISTS and soil mottling. The compliance evaluation was limited to soil descriptions and determination of the depth to the base of drainfield rock in the two drainfield trenches of the ISTS system. No evaluation ot the septic tanks or distributiGn devices of the I5TS system was performed. Sco�e of Work Three hand auger soil borings were advanced at locations ne�ir the middle of the drainfield trenches, see Figure l, Appendix. Soil descriptions were made following U.S. Department of Agriculture - Soil Conservation Service nomenclature (Soil Survey Manual, USDA-SCS, 1981). Soil colors were determined using Munsell soil color charts. Soil boring logs are found in the Appendi�. 11�e depth to the base of the drainfield rock in the trenches was determined by pushing a probe rod through the drainfield rock to the underlying soil. Results and Discussion The soil boring logs show that soil mottling was encountered at various depths. Soil mottling � was observed at a depth of 3.7 feet at soil boring B-1, upslope of the first drainf'ield trench. Soil mottling was observed at a depth of 7.7 feet at B-? at a location downslope from the second drainfield trench. Soil mottling was observed at a depth of 6.7 feet at soil boring B-3 located between the rivo drainfield trenches. The base of the drainfield rock in the first trench was 4.3 feet below the ground surface at P-1 and 2.7 feet at P-3. The base of the drainfield rock in the se;,ond trench was at a depth of 2.� feet at P-?. No sewage effluent was observed in any of the testholes performed. These results, converted to elevations, are tabulated on Figure 1. STS Consultants Ltd. Consulting Engineers 3650 Annapolis Lane Suite 120 Minneapolis, Minnesota 55447 612.559.1900/Fax 612.559.4507 �'" ' '/� � � l� � � !�' " '//� � �� ( �� '�K.� � r ' I/I � �� ,,;� ��..�� 1 f/1�� J James A. Abbott STS Project 96588 Au�ust 27, 1996 ►�l` Page 2 The City of Orono requires a vertical separation of 3 feet between the base of drainfield rock in an ISTS trench and the upper limit of soil mottling. The results indicate that the separation is not met in the first drainfield trench based on the soil descriptions from soil boring B-1 and measurements at probe P-1. The required vertical separation distance is met in the second trench based on soil descriptions from soil borings B-2 and B-3 and measurements at probes P-2 and P-3. Thank you for the opportunity to provide ISTS site evaluation services to you. If you have any questions or require further assistance, please feel free to contact me at 559-1900. Sincerely, STS CONSULTANTS, LTD. ��^ r �,�.,.� /" �`-`--' ' � • e`-/��/ '��t` ;,`a, --- , � `� Gary J. Rath'�bun, C.P.S.S. Senior Soil Scientist Designer I License 112 GJR/pb Encs. C6�88001.DOC SECOND DRAINFIELD TRENCH (APPROX) TESTHOLE ELEVATIONS �— FIRST DRAINFIELD TRENCH (APPROX) SOIL BORINGS GROUND SURFACE TOP OF SOIL I�OTRJNG � � ��Z i � B-1 98.7 95.0 I j 0' SCALE 20' B-2 97.1 88.3 I � �� B-3 98.1 91.4 I � I � I � PR08ES GROUND SURFACE BASE OF DRIUNFlELD ROCK B_,Z � I �P—� 8-1 98.2 93.9 1 1 8-2 97.7 95.2 B-3 97.4 94.7 1 I � P�� P-3� 8-1 � ��-3 i � , � , � , � , � , � , � ' � SOUTH RISER PIPE �� '� OF SOUTH SEPTIC TANK i ; GROUND El_EV. 99.2 i j LIQUID LEYEL 96.4 1 � i � i � 0 �B—# BORING NUMBER B M EXISTING HOUSE B.M. = BENCHMARK TOP OF PATIO BLOCK • P—# PROBE NUMBER ASSUMED ELEV 100.0 FT. *i v� cn in �N DRAWN BY BAP DATE 8 5 96 � y vi vi ° t�i1 / / m , �`' � o � o ;o SOIL BORING AND PROBE LOCATION DIAGRAM CHECKED eY onTE -- Z U' �- � � N 1 ABBOTT PRELIMINARY ISTS COMPLIANCE EVALUATION GJR � o I I � -ni � � �,�—. � APPROVED BY DATE N O m � o �N 1 0 0 0 S O U T H B R O W N R O A D o � �, �� 'I ORONO, MINNESOTA �AOFi�E - --- ` � a � G6588001 IC��IENT ILOG OF BORI�J6 NUMBER B-1 �� Mr . Jim Abbott I 1 PROJECT i�aME ARCHITECT-ENGiNEER srs eonsul:ancs ��ta. Preliminary ISTS Compliance Evaluation Ji I E LOC:+TIGN UNCONFINED COMPRESSIVE STRENGTH 1000 Brown Road South in Orono, Minnesota ror,siFT.2 1 2 3 a 5 i I �LaSTiC WATER LiOUID _ �� z LIMIT X CONTENT ; �IMIT : ,� � � N DESCRIPTION OF MATERIAL x - - - - - - �- - - - - 0 _ > Z ' o ¢ I io zo 30 .�o so a' W W W W c w a � � o STANDARD "I � � ��iQ SUF4FACE ELE`/ATION 98.7 ft � _� ��NEran�ozoN aoowsiso� � i ', Very dark grayish prown (10YR 3/2) sandy loam - ! � � HA I rlll i I i I I ; i � Dark brown (10YR 3/3) sandy loam to sandy clay Hq loam - fill Very dark grayish brown (10YFi 3/2) sandy loam HA i Dark yellowish brown (10YR 4/4) sandy loam I i i HA I Yellowish brown (10YR 5/4) sandy loam HA i Brown (10YR 5/3) sandy loam; common, medium, distinct strong brown (7.5YR 5/8) mottles HA i i I I � End of boring at 6.5 feet depth (hit stone) . � � Hand augered with 3.0 inch ID bucket auger I I I ta full depth. I Borehole backfilled with soil cuttings. I � i � I i � � � � I ( � � I I ihe strat;f�cat�on lines represent the approximate Ooundary !ines betNeen soil typ°s: :,rsitu, the transition may be gradual. '�L WS OR WD BORING STaRTED STS OFFiCE 07/2G/96 Minnesota W� BC= aCR 60RING COMPLETEO ENT,RED BY SHEcT N0. OF 07/29/96 c�r 1 1 'NL � RiSiFOFEMAN APP'0 BY STS J08 N0. HA/GJR GJR 96��8 � � �CLIENT �LOG OF BORING NUMBER B—2 � � Mr . Jim Abbott 1 PROJECT NAME ARCHiTECT-ENGINEEP �TS e�nsulcants �c�. Preliminary ISTS Compliance Evaluation SiTE LOCA7ION � uNcoNFtNeo con+PaEssivE sr�ENeTN 1000 Brown Road South in Orono, Minnesota Tor,siFr.� i z s a s "� PLaSTIC WATER LIOUIO ✓ w LIMIT X CONTENT % L?4IT X U � � � � DESCRIPTICN OF MATERIAL X - - - - - - �- - - - - '� 0 = w z '- � Q 10 20 30 40 �0 � w w w w �j J J J > � " a d 2 O STQN�QF3� ��'i� a I `a�la wl i PENETRATION BLOWS/FT. ;� � : � � �,SL��FAC� tLEVATION 97.1 ft ia zo so ao =o I Very dark grayish brown (10YR 3/2) sandy loom - i ! fiil � ; HA I � � ' � I ! I Dark yellowish brown (10YR 4/4) sandy clay loam - I fill HA Hq Very dark grayish brown (10YR 3/2) sand�;� laam - 'ill Mixture of very dark grayish brown (10YR 3/2) sandy loam and dark yellowish brown (;OYR 4/4) sandy clay loam - fill HA � Very dark grayish brown (10YR 3/21 sandy loam HA �ark yellowish brown (10YR 4/6) sandy loam HA Dark yellowish brown (10YR 4/6) sandy loam; ' ' ______ ____I rommon, medium, distinct strong brown (7.5YP, 5i81 __________ , � , mottles - ----- ------- -- ----- � -------- I � � i � I � continued � I ine stratificat�on !ines�eDrecent tne aDoroK�mate Ooundary lines betrrten;ai] ;vees:m-s�tu. tne trans�tion nay be gratlual. STS JOB vu.9 65 8 8 I SNEET NO. 1 CF � ` � 'C�iENT LOG OF BOAING NUMBtR B—2 Mr . Jim Abbott � iPP�O�ECT NAP�IE ARCHITECT—ENGiNE�R srs �onsultares !ta l Preliminary ISTS Compliance Evaluation SITC LOCATION UNCONFiHED COMPRESSIVE STRENGTH 1000 Brown Road South in Orono, Minnesota roNsiF�.' 1 2 3 4 5 I "l PLASTIC WATER LIOUID � w LIMIT X CONTEN7 % LIMIT % � � � � I DESCRIPTION OF MATERIAL %� - - - - - - �- - - - - � T o — > z � Io � io zo =o ao so a w w w ww w � a a '�a. 'o STANDARD ,� � `a c a w ,��T*-� PENETRATION BLOWS/FT. , � � �� SURFACc ELE'�.,� ��N �7. 1 :o zo �o ao so � ' � I � � Cont�nued from previous page ----,-------- � ------------- -------- -------- --- -------- ----- ---- Dcrk yellowish brown (�OYR 4/6) sardy loam; HA common, medium, distinct strong brown (7.5YR 5/8) mottles i �nd or boring at 8.8 feet depth. Hano augered with 3.0 inch ID bucket auger to fu ll depth. Borehole backfilied with soil cuttings. � i � The strat�ficaiion lines repr�sen� the aeprox�mate bounoary lines between soil types:in-situ, the trans�tion mav be gradual. wL w5 DR wD BORING STaRTED 57S OFFICE 07/29i°o Minnesota wL 9CR ACR BORING CCMPLETEO ENTERED BY SHE�T N0. OF 07%29/96 g]r 2 2 'N� RIG/FORE4AN APP'D BY STS JCB N0. HA/GJR GJR I g65gg � � �CL=�fd7 iLOG OF 60RING �'�lUMBER B-3 � � Mr . Jim Abbott � �FP,C7JE'�' NAME ARCHITE�T-ENGIiJEE� srs scnsulc-ncs �_�.I Preliminary ISTS Compliance Evaluation S1TE LOCATION I UNCONF_NEO COMPRESSIVE STRENGTH 1000 Brown Road South in Orono, Minnesota roNsiFT.� 1 2 3 a 5 � � �I "� w�� PLAST`_C WATE9 LIOUID = �'i LIMIT � CONTEfJT % LIMIT A _ z �'i = ~ a I�-,i DESCRIPTION OF MATERIAL %� - - - - - - �- - - - - � 0 � � � � I�I¢ io z� 3o ao so LJ � w J IW I,�i � � 2 a �a��.c, I SiANDARD ;<�i � � i�IQ'SURFACE ELE'VAT ION 98.1 f t � io ;oNE�A�ozoN eaowsi�a. ! P4ixture of ��ery dark grayish brown (10YR 3;2) � sandy loam and Gark yeilowish brown (10YR -t/4) i � � sandy clay loam - fill � HA � I I i Very dark gray_sh brown (10YA 3/2) sandy loam � HA � I Dark yellowish brown (10YR 4/4) sandy loam HA I I i I I Hq , i Yellowish Drown (10YR 5/4) sandy loam; common, � medium, distinrt strona brown (7.5YR 5/8) mott Ls � End of boring at 7.0 feet deptn. , Hand augered with 3.0 inch I� bucket auger I to full depth. ' Eorehole bar_kfilled with soil cuttings. ' I � I � I i � � � I The =_tratification ]ines represent the dpproxlmate Dounaary lines between s0il typeS' 1n-situ, the transiiion may be graaual. WL WS OR WD EORING STARTE� STS OFFICE 07/29/96 Minnesota W� 2CR aCR BORING COMPLETE� � ENTERE� BY SHEET N0. OF 07/29/96 a�r 1 1 WL RIG/FOREMAN I APP'� 9Y STS JOB N0. HAiGJR i GJR g6�98