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HomeMy WebLinkAboutRAPTORS KNOLL S12001Onsite File Aft Am rzapTors K n wok I I November 19, 2014 Municipality of Anchorage Building Safety Division On Site Water and Wastewater Program 4700 Elmore Street Anchorage, AK 99507 Attention: Debbie Wockenfuss Subject: Raptor's Knoll Subdivision S-12001 Septic System Feasibility Study Dear Debbie: We recently reviewed the proposed plat for Raptor's Knoll Subdivision with the intent of completing a subsurface soils study to identify areas suitable for the construction of on site septic systems to dispose of septic effluent to be generated from the houses proposed for construction on the newly created lots. Raptor's Knoll Subdivision is located north of 142nd Avenue approximately 600' west of Goldenview Drive. The parcel will be divided into 6 individual lots with the surface area ranging from 44,317 square feet to 54,094 square feet. The existing well and septic system on the property will be decommissioned in accordance with Municipal Code and new wells and septic systems will be constructed on each of the lots. The ground surface of the lots slopes from the east to the west at a grade approximating 10% to 15% with some areas in excess of 25%. Flatter areas were located on all of the proposed lots for home sites and septic systems. Sufficient space is available on each lot for placement of wells and septic systems to meet the 100' setback requirement. Test holes were placed on the proposed lots in February of 2013. Soil assessment and percolation testing continued during that period. Water monitoring has been ongoing with readings last taken on October 15, 2014. To date no water has been noted in any of the test holes. The purpose of the test holes was to assess the underlying soil conditions and to determine whether septic systems could be placed on the lots to serve single-family homes. No bedrock or impermeable lenses of material were encountered. The locations of the test holes were determined in the field for use in the future for developing septic systems. Percolation benches were constructed at various depths in the holes, but primarily 5' to 6.5' below the original ground surface. A percolation cavity was prepared to determine the absorptive characteristics of the soils encountered. The cavity was presoaked in accordance with Municipal requirements and a percolation test performed. The results of the tests are included in the attached documentation. In Raptors Knoll Subdivision S-12001 November 19, 2014 Page 2 every case gravel with sand (GM) with varying degrees of silt was encountered full depth in each hole. The percolation rate was 2.0 to 29 minutes per inch. The majority of the percolation tests were under 10 minutes per inch. All work was completed under the direction of technicians and engineers at Anderson Engineering. The results of their percolation tests and test hole logs are included as well as the water monitoring results. Based on our field study and water monitoring completed to date it appears all lots of the proposed subdivision are capable of supporting an onsite septic system. A 10,000 to 16,000 square foot reserve area is shown on each of the proposed lots for septic system construction. In addition, Test Hole Logs and a Location Map are included which illustrate soils encountered, percolation rates and their respective location on the individual lots. Sincerely, w1ju,,1 E- La, Michael E. Anderson, P.E. Attachments ®.®®®®,® ®PSE •OF A4qJ®AV C®® . ,. L AW P• 49th �. S MICHAEL E. ANDERSON AV NO. CE -4381 s AV ®,®®A®0ea®�®• e® ----- ----- - --- - - - T-- - -�- NOTES — --- -- -- � 10' TIL. ESMT. — — — — — — — — — — — — I \ \\ \ 1 \ , ) F \ 1. No Wells or Septic Systems to the North of this Subdivison ��aoa o,o o s I S TIC RES AREA 1 SERVE EA OT a \ \ I Conflict with the Proposed Well Locations or Septic System \ 1 I \ \ I 54 94.F. \ 1 l I Reserve Sites. T \ I.I ; „ (55, i5 F.) \ \ \ I/ 2. The Existing Well and Septic System on the Tract will be 5 ,o S. o \ Decommissioned in Accordance with Municipal Code. I 1 \\ 5, 1 S. i o ��-- I 3. No Wells or Septic Systems to the South of this 1 1 1 \ \ \ — \ \ \ I z \ \ THS \ M Subdivision Conflict with the Proposed Well Locutions or Septic 1 N I Q\ \ I o System Reserve Sites. Existing \ n I ; \ H9 m —� `y`F \ 1 I n 3 \ \ Well I r \\ TH1(loNol E.a 1 I I I wen F`` 5 I n �\ muce \) SEPTIC. SYSTEM PI -A -N___,/' LEGEND ® Test Hole Designation and Location S Well Location with 100' Protective Radius Municipality of Anchorage Development Services Department Building Safety Division On -Site Water and Wastewater Program 4700 Elmore Road / P.O. Box 196650 Anchorage, AK 99507 www. 07) 343- 9e.ak.us (907)343-7904 Soils Log - Percolation Test Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 1 4A�' f -7 - 9- Date GrossTimeNet 2- Depth to Water Net Drop 3-l 2/14/2013 ` 12- �3o/fi.(o°� 4- E 6- tl 7- 9- Date GrossTimeNet 10- Depth to Water Net Drop 11- 2/14/2013 til/l'3E 12- �3o/fi.(o°� �`�I 13- 3 6/5) 4(, 14- 15- 16- 17- 18- 19- - - _r_17,t� a:lv��%2�' It 4�� OF ,4 �P S5��, AV 69 ase• o.0000.eo ••aoe•ee10.7 . e•ooe 0, MICHAEL E. ANDERSON s• CE - 4381 � e • �c ov Date Performed: Feb 8, 2013 Township, Range, Section: WAS WAS GROUND WATER ENCOUNTERED? s IF YES, AT WHAT DEPTH? L 0 Depth to Water After 4 p Monitoring? ! `� o /�I � E Date: Site Plan Reading Date GrossTimeNet Time Depth to Water Net Drop 1-2 2/14/2013 til/l'3E I o An�tdS �3o/fi.(o°� �`�I 3-4 3 6/5) 4(, 5-6 7-8 9-10 a:lv��%2�' It ✓ �{`�•�i �j. Lrj e 11-12 l d u IA 31 �t X38 i PERCOLATION RATE (minuteslinch) PERC HOLE DIAMETER TEST RUN BETWEEN l�rj FT AND 5� V FT COMMENTS Perc Cavity was presoaked 7 PERFORMED BY: A. Harala I I - LI E—j `,,j CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: /0 -r 7-/ f Municipality of Anchoragear ��. F� a°p�tre���s •°°S#�® Development Services Department Building Safety Division A C9 • 49 TN Net Drop 12- On -Site Water and Wastewater Program°°•PO••• 4700 Elmore Road eoe• �•..... �s•e° a°..° �2-e° L% 1o�F P.O. Box 196650 Anchorage, AK 99507 °°' ° •� �•••.•••°°• `• °�°°°°o `° MICHAEL E. ANDERSON www.ci.anchorage.ak.us (907) 343-7904 °. �� ,�j+f•,• CE -4387 •°°\Z`"� ��C� P Soils Log - Percolation Test ®kpROFESSWO Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 1 �rV I (Feet) 1- cL 2- , 4-I. 5- 15° 6- G i 7- 10- "I Date Gross Time 11- Depth to Water Net Drop 12- 2/14/2013 S 13- L 0 14- ��C� P 15- L E 6- 16- 17- 17-18- 18- 19- 19-1- 3 Date Performed: Feb 8, 2013 Township, Range, Section: Site Plan WAS GROUND WATER Date Gross Time ENCOUNTERED? Depth to Water Net Drop 1 2/14/2013 S IF YES, AT WHAT DEPTH? L 0 Depth to Water After ��C� P Monitoring? 7,���� E Date: Reading Date Gross Time Net Time Depth to Water Net Drop 1 2/14/2013 2 l� 2'� �,�+r�5 7,���� 3 4 5 0 6 (; Zr 3 0 ►� 115, v� ?�; I �t PERCOLATION RATE (minutes/inch) PERC HOLE DIAMETER if " TEST RUN BETWEEN FT AND �j O FT COMMENTS Perc Cavity was presoaked A. Harala I _Al CaCC RTIFY THAT THIS TEST WAS PERFORMED BY: PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDEL_INES IN EFFECT ON THIS DATE. DATE: /( i7 -1)e Municipality of Anchorage Development Services Department Building Safety Division On -Site Water and Wastewater Program 4700 Elmore Road P.O. Box 196650 Anchorage, AK 99507 www.ci.anchorage.ak.us (907)343-7904 Soils Log - Percolation Test Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 2 4'� F 1- 2 3- 4- 5- 6- 7- 8- 9- 10- 11- 12- 13- 14- 15- - 7-8-9- 10- 11- 12- 13- 14- 15- l�� G� 16- d� 17- 18- 19 —V p\/j 20 - rd 49TH ..... ............. ...... ..... a........ MICHAEL E. ANDERSON . � ��4. s°. CE - 4381 ryry �g pROFESSlO�,a�' �L' Date Performed: i-eD u, zU 10 Township, Range, Section: Site Plan WAS GROUND WATER Date Gross Time ENCOUNTERED? Depth to Water Net Drop 1 2/14/2013�.r S IF YES, AT WHAT DEPTH? (o.-0 L 0 Depth to Water After _ P Monitoring? e%0" E Date: W Reading Date Gross Time Net Time Depth to Water Net Drop 1 2/14/2013�.r 19'i�� � (o.-0 2 0`34 IC?pi e%0" �tYytc 3 W _,_-7 4 5 , PERCOLATION RATE (minutes/inch) PERC HOLE DIAMETER 7„ TEST RUN BETWEEN FT AND �. tJ FT COMMENTS Perc Cavity was presoaked PERFORMED BY: A. Harala ICERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: /%"�� WAS GROUND WATER Gross Time Net Time Municipality of Anchorage ���a=i=l��S d� Development Services Department ®Gj®° Building Safety Division aw¢r o On -Site Water and Wastewater Program 4700 Elmore Road 60'"60690y�,�r°0,° ,�°.°0.. o °°;°• 0 - v6 `',° ] i �e �'0O° ""°°'°' °° '•"•'•°•'•'°s P.O. Box 196650 Anchorage, AK 99507 www.ci.anchorage.ak.0s o /MICHAEL E. ANDERSON (907) 343-7904 � c^ . �® j�.0e CE - 4381 Soils Log - Percolation TesttFD •,•\�` Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 2 (Feet) 1-- 3- 4 _ 5- 6- 7- 8- 9- 10- 11- 12- 13- 14- 15- 16- 17- 18-. 3- 4- 5- 6- 7- 8- 9- 10- 11- 12- 13- 14- 15- 16- 17- 18-. 19- C - 14 --; Date Performed: Feb 8, 2013 Township, Range, Section: Site Plan T" rm Reading WAS GROUND WATER Gross Time Net Time Depth to Water ENCOUNTERED? 1 2/14/2013 I9i M / ', v5 tI s �e IF YES, AT WHAT DEPTH? L 7 (Y Depth to Water After 3 D P I19•,5� Monitoring? ,1 N C 1 Date: 5: fS-13 T" rm Reading Date Gross Time Net Time Depth to Water Net Drop 1 2/14/2013 I9i M / ', v5 tI 2 K 10 5. 3 I19•,5� 5� s PERCOLATION RATE Vi , (minutes/inch) PERC HOLE DIAMETER TEST RUN BETWEEN �t—,`� FT AND, Li FT COMMENTS Perc Cavity was presoaked A. Haralav i" �'� PERFORMED BY: I "a' � "" � CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: /� t 7.1 Irl6r 6- 7- 8- 9- 10- 11- 12- 13- 14- 15- 16- 17- 18- 19_ g>�,' 20_H 0- t; m WAS GROUND WATER ENCOUNTERED? S IF YES, AT WHAT DEPTH? L Depth to Water After o A P Monitoring? ti C t.) G E Date: Reading Date C h Net Time Municipality of Anchorage Net Drop 1 Development Services Department O•. Building Safety Division 49 THS P-�v 2 r On Site Water and Wastewater Program 4196 Elmore Road �1 oe •0•°° Q0°• ••r•a°•••••• 6•: � e��j � P.O. Box 196650 Anchorage, AK 99507 -tom goo � :y••••......•••.•:•,••••• •o•••' www.ci.anchoraoe.ak.us � •MICHAEL E. ANDERSON :% x (907) 343-7904 � Jam••• CE -4381 ••� 4`" Soils Log - Percolation Test ��+��`�� p'•���a;'''0`��j 5 Performed For: Ray HickelDate Performed: Feb 8, 2�`3� f -i ! Legal Description: Timber Trail Subdivision, Lot 3 Township, Range, Section: - {_� Slope Site Plan 1 : ��? 3 o flea �d� � � " 3, 27 Irl6r 6- 7- 8- 9- 10- 11- 12- 13- 14- 15- 16- 17- 18- 19_ g>�,' 20_H 0- t; m WAS GROUND WATER ENCOUNTERED? S IF YES, AT WHAT DEPTH? L Depth to Water After o A P Monitoring? ti C t.) G E Date: Reading Date Gross Time Net Time Depth to Water Net Drop 1 2/14/2013 2 3 12 4 7i `1` �J©m1/4(f 5 6 1 : ��? 3 o flea �d� � � " 3, 27 PERCOLATION RATE _ (minutes/inch) PERC HOLE DIAMETER 6 `� TEST RUN BETWEEN 4,y FT AND C" �p FT COMMENTS Perc Cavity was presoaked PERFORMED BY: A. Harala I CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 3 tel( o FF Depth (Feet) 2- 3- 5- Od 6- 7- 8- 10- 11- 12- 13- 14- 15- 16- 17- 18- 19- 20- Date Performed: Feb 8, 2013 Township, Range, Section: Site Plan WAS GROUND WATER ���%%%BBQ Municipality of Anchorage ° N° .�?qS bb Development Services DepartmentAV Building Safety Division ®, P• ®'` °• v �: ° TH On -Site Water and Wastewater Program 00 4g 4700 Elmore Road 0... ... '0....�°°°�"°°7..°°°'°°•r°�••°°�°'•'e P.O. Box 196650 Anchorage, AK 99507 www.ci.anchorage.ak.us . ........ P9� °•MICHAEL E. ANDERSON (907) 343-7904♦ Ul•. CE - 47381 Soils Log - Percolation Test Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 3 tel( o FF Depth (Feet) 2- 3- 5- Od 6- 7- 8- 10- 11- 12- 13- 14- 15- 16- 17- 18- 19- 20- Date Performed: Feb 8, 2013 Township, Range, Section: Site Plan WAS GROUND WATER Date ENCOUNTERED? Net Time Depth to Water S IF YES, AT WHAT DEPTH? L Depth to Water After Monitoring? P P G' r 'E" IJ E Date: 5- tG -13 Reading Date Gross Time Net Time Depth to Water Net Drop 1 2/14/2013 r 2 3 4 5�- 6 IZ'' 30 Mins lra�o(n �•�1 PERCOLATION RATE I I (minutesfinch) PERC HOLE DIAMETER TEST RUN BETWEEN Zk 5 FT AND D FT COMMENTS Perc Cavity was presoaked C12 PERFORMED BY: A. Harala 1 144 CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 1V -1 % -(y 13 Performed For: Legal Description �k fi Depth (Feet) 1- 2- 3- 4- 5- 6- 7- 10- 11- 12- 13- 14- 15- 16- 17- 18- 19- 20- Ray Hickel Timber Trail Subdivision, Lot 4 �o Date Performed: Feb 8, 2013 Township, Range, Section: Site Plan WAS GROUND WATER d - IF ENCOUNTERED? YES, AT WHAT DEPTH? L O Depth to Water After p Monitoring? /'J L" - E Date: r5_ i5_6 Reading OF A� Municipality of Anchorage �,` ,• ER es���t3 Development Services DepartmentX 49°• � " Building Safety Division On -Site Water and Wastewater Program ® p 7.ao•••e•• a oosev•sse ®��� � • �: •� �J'�° (� t -� 4700 Elmore Road P.O. Box 196650 Anchorage, AK 99507 ®••° •°°°• • ..... .... =•MICHAEL E. ANDERSON www.ci.anchorage.ak.us ®_ s'.• CE -4381 (907)343-7904 99 CD °•.e.°• ®�111 Soils Log - Percolation Test tvOFESS10oPk�� Ray Hickel Timber Trail Subdivision, Lot 4 �o Date Performed: Feb 8, 2013 Township, Range, Section: Site Plan WAS GROUND WATER d - IF ENCOUNTERED? YES, AT WHAT DEPTH? L O Depth to Water After p Monitoring? /'J L" - E Date: r5_ i5_6 Reading Date Gross Time Net Time Depth Net Drop 1-2 2/15/2013 �tocWater 3-4 7-8 7/1 �v i � 7.SG l /•�� li � Z 9-10 i �,21��( 31 t`l �1 1 ��o Z. b(a ` v PERCOLATION RATE rj (minuteslinch) PERC HOLE DIAMETER] TEST RUN BETWEEN (� FT AND rj IFT COMMENTS Perc Cavity was presoaked PERFORMED BY: A. Harala I YIPA- z jamj Cj CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 10 7. V ge ®A Municipality of Anchorage g`S °• s q Development Services Department AF- g . Building Safety Division ! * e 49 THj-`0.1 On -Site Water and Wastewater Program ® 4700 Elmore Road $0':;:;;;' P.O. Box 196650 Anchorage, AK 99507 ®� www.ci.anchorage.ak.us 0 ,- -.MICHAEL E. ANDERSON (907) 343-7904 ®® jJ •,• SCE - 438 7 °o \�`�Ae Soils Log - Percolation Test B� ° ROF ioN'g- ® Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 4 I I� � F 2- 3- - 3- 5- 6- 7- 8- 5- 6-7- 9- 10- 11- 12- 13- 14- 15- 16- 17- 18- 9- 10- 11- 12- 13- 14- 16- 17- 18- 19 -1 19-I I ._( Date Performed: Feb 8, 2013 Township, Range, Section: Site Plan WAS GROUND WATER p ENCOUNTERED? f S IF YES, AT WHAT DEPTH? L 0 Depth to Water After p Monitoring? _A1� C- E Date: 5- 15- 1 3 Reading Date Gross Time Net Time Depth to Water Net Drop 1-2 2/15/2013 3-4 �i:0'��i`I'�i 1l ��°�1/��I'z_ 5-6 7-8 9-10 (� 3VI `f6 `� �,`�1��/� �o -7,,1 v" 11-12 PERCOLATION RATE 4, °') (minuteslinch) PERC HOLE DIAMETER TEST RUN BETWEEN FT AND V;' FT COMMENTS Perc Cavity was presoaked PERFORMED BY: A. Harala I�'� L' �YL&l CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: lo`il-IX 4S - Municipality of Anchorage Al t E��° •Lk1�, �� Development Services Department •' .' Building Safety Division r ; 4 9THR • ° 4 On -Site Water and Wastewater Program d .... ° co•ooao•sxe • 4700 Elmore Road 10z .......... •� ,- P.O. Box 196650 Anchorage, AK 99507 :MICHAEL E. ANDERSON .°� e www.ci.anchorage.ak.us c' ° 1,; (907) 343-7904 !rJ •,� CE - 4381 Soils Log - Percolation Test ®gF° PRoF°°°o'0 X471 Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 5 'A 9. 1 t,ree>:� Off. 3- 4- 5- Q - 6f i 9- 10- 11- 12- 13- 14- 15- 5 16- 17-� tea 18- 19- 20- Date Performed: Feb 8, 2013 Township, Range, Section: Site Plan WAS GROUND WATER ENCOUNTERED? S IF YES, AT WHAT DEPTH? L 0 Depth to Water After _ A P Monitoring? C. E Date:'tS�t3 Reading Date Gross Time Net Time Depth to Water Net Drop 1-2 2/15/2013 {�.'f1{/i�'.7`f " { [Aldt? 7.3$ Wt P. 5-6 t�',`W I:�i[ �I 7, q1 (a.f'Y 7-8 n147•� 9-10 11-12 {2' 7;,5 ((y PERCOLATION RATE (minuteslnch) PERC HOLE DIAMETER TEST RUN BETWEEN4-,,::; FT AND ,ry FT COMMENTS Perc Cavity was presoaked PERFORMED BY: A. Harala ICERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: Municipality of Anchorage Development Services Department s Building Safety Division o _ On -Site Water and Wastewater Program 0 49TH 4700 Elmore Road P.O. Box 196650 Anchorage, AK 99507: g 800.........eea...oe..es..00emee..egj www.ci.anchorage.ak.us (907) 343-7904 ,MICHAEL E. ANDERSON %'. CE -4381 ^"-- Zo Soils Log - Percolation Test p���Fo rcr7 '•°°�`'��a Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 5 3- 4- Net Drop (Feet)I ei6,-- 2- Date t( 12- 3- 4- Net Drop 13- 2/15/2013 �I,`W[N$ 14- 5- 6- -7-8-9-i 7 fSJ" z 7- (( "I, ! (1"?: 09 16- 8- 9- i °'r 10- 11- Date t( 12- to Water Net Drop 13- 2/15/2013 �I,`W[N$ 14- lfDepth `rf'•�2//I¢�� 7 fSJ" 3-4 (( "I, ! (1"?: 09 16- 17-��. (2',(( 111tIA 18- 19- 20- IPT H F SS40t��,� Date Performed: Feb20a,=tee Township, Range, Section: Site Plan WAS GROUND WATER P ENCOUNTERED? —�\► S IF YES, AT WHAT DEPTH? L Depth to Water After P Monitoring? O t3 L E Date: -5i;45 ( 7 Reading Date Gross Time Net Time to Water Net Drop 1-2 2/15/2013 �I,`W[N$ HIAtI,, lfDepth `rf'•�2//I¢�� 7 fSJ" 3-4 (( "I, ! (1"?: 09 `' 5-6 (2',(( 111tIA 7-8 (Z+2 �7i?i U cl (� 7 7•JI 9-10 11-12 (v¢��lvy� "�/la.� �i•8� PERCOLATION RATE '/-, V (minutes/inch) PERC HOLE DIAMETER t TEST RUN BETWEEN ri FT AND �22 FT COMMENTS Perc Cavity was presoaked PERFORMED BY: A. Harala I X'_f"'4-ej C, ,; j1_-7 CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: Municipality of Anchorage ° ` N � •••••.o•.., Development Services Department �Q;• °:�s Building Safety Division .'%�� _ On -Site Water and Wastewater Program ®� ; 49 H : 7 4700 Elmore Road ®•'J°,° ° °•�9I °}.°..°° °°••°°°° P.O. Box 196650 Anchorage, AK 99507 o.;;°�.•° °a•"•••° / www.ci.anchoraoe.ak.us ®� �MICHAEt E. ANDERSON (907) 343-7904S . ,4 CE - 4381 .° 0 � Soils Log - Percolation Test e��Fo °• Y �-; •"���� Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 6 '0&—, Date Performed: Feb Township, Range, Section: Site Plan WAS GROUND WATER ' ENCOUNTERED? •••------I����l--- s IF YES, AT WHAT DEPTH? L 0 Depth to Water After ) '�� P Monitoring? h'e E Date: Reading Date Gross Time 2- 3- Depth to Water Net Drop 1-2 2/15/2013 17;S5f =06 4- 5_ 3°v19.7r10 L I a 3-4 I 7- Iz 3 %`)« 5-6 9- 10- 0-11- t 11- 12- 12- 13- 13- (Zi0 14- 14- q% 11-12 I�df./IZ2 �`�` 16--_- 16- 17- ILA 18- r 19- 20- Date Performed: Feb Township, Range, Section: Site Plan WAS GROUND WATER ' ENCOUNTERED? •••------I����l--- s IF YES, AT WHAT DEPTH? L 0 Depth to Water After ) '�� P Monitoring? h'e E Date: Reading Date Gross Time Net Time Depth to Water Net Drop 1-2 2/15/2013 17;S5f =06 10 MId,, 3°v19.7r10 `pp.1D" 3-4 13�051/ �3 f% Iz 3 %`)« 5-6 7-8 9-10 (Zi0 q% 11-12 I�df./IZ2 �`�` PERCOLATION RATE (minutesfinch) PERC HOLE DIAMETER " TEST RUN BETWEEN �. D FT AND .C, FT COMMENTS Perc Cavity was presoaked PERFORMED BY: A. Harala I N" J4J' (F—OL-k-9 CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: /%' Municipality of Anchorage Development Services Department Building Safety Division On -Site Water and Wastewater Program 4700 Elmore Road P.O. Box 196650 Anchorage, AK 99507 www.ci.anchorage. ak. us (907) 343-7904 Soils Log - Percolation Test Performed For: Ray Hickel Legal Description: Timber Trail Subdivision, Lot 6 Ov (Feet)Ip 9-I I *AA -/A, 10-1 1 �e (,!�,,, 11- Date .� P Gfi 0 12- Depth to Water S 13- L 0 Depth to Water After 14- Monitoring? NG' E 15- z 5 h n j/'� ej f 16- 17- l kvy 18- 19-7'r4 2 6 . dd 49 rH %`°e•• ° 7®dy •o• � s V e e6eeeo••ee e1 e•e•Jc.-•e. e • J ®••of"ive••••.v ew-a ���J{{{1'''//ilii```>���`�•'''/ e e• a e o ••MICHAEL E. ANDERSONff .• ;OA P, C -E - 4381 e )AW � I l -311, Date Performed: Feb! , 'fs3v- * � Township, Range, Section: WAS GROUND WATER Date ENCOUNTERED? Net Time Depth to Water S IF YES, AT WHAT DEPTH? L 0 Depth to Water After t P Nn Monitoring? NG' E Date: z 5 Site Plan Reading Date Gross Time Net Time Depth to Water Net Drop 1-2 2/15/2013 �3 3 ����' lo ilk��rJ ��h`�kt . t-7, 3-4 ?•.�jt 5-6 'q�r'l3''� 7-8 13 II�I�:DS 11-12 PERCOLATION RATE (minutes/inch) PERC HOLE DIAMETER 0 TEST RUN BETWEEN `i'.� Fr AND C O FT COMMENTS Perc Cavity was presoaked �— PERFORMED BY: A. Harala I l/�%c�j Z-_ 2J—CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: l0 -i 7-/ V J. A. MUNTER CONSULTING, INC. December 1, 2014 Mr. Ray Hickel Raptors Properties 1900Northern Lights Blvd, Ste. 200 Anchorage AK 99517 Re: Evaluation of aquifers at Raptors Knoll Subdivision, Anchorage, Alaska. Dear Mr. Hickel: This letter report is to provide the findings of an evaluation of aquifers near the proposed Raptor's Knoll Subdivision. The purpose of the evaluation is to determine if there is enough water to support on-site wells and to determine whether any surrounding well owners would be adversely affected. Hydrogeologic Setting The general groundwater conditions in the vicinity of the site are described by Dearborn and Barnwell (1975) and Glass(1988). Raptor's Knoll Subdivision is located in the drainage basin of Rabbit Creek on Anchorage's lower Hillside area. Unconsolidated deposits in the area are mapped as more than 150 ft thick in the area of the subdivision (Glass, 1988). Dearborn and Barnwell (1975) indicate that unconsolidated sediments are in the range of 150 to 250 feet thick at the location of Raptor's Knoll subdivision. Mapping of the bedrock surface by both Glass (1988) and Dearborn and Barnwell (1975) show the presence of a major buried bedrock valley that generally follows the course of Rabbit Creek, which is located just a few hundred feet north of the proposed subdivision. Recent test drilling confirms the presence of relatively thick glacial and alluvial sediments at this site that are associated with this major bedrock feature. Dearborn and Barnwell (1975) indicate that most wells are expected to obtain water from sand and gravel aquifers, with typical well yields in the range of 5 to 40 gallons per minute, in the area of Raptor's Knoll Subdivision. A few wells in the area located south and east of the proposed subdivision tap a bedrock aquifer. Methods and Sources of Data This report provides a vicinity analysis that includes an evaluation of well data from surrounding properties to evaluate the general conditions in the area. Historic water -level data are evaluated to determine if there is a pattern of declining water levels in wells. Also, water -budget information is used to estimate potential sustainable aquifer yields using methods similar to those used by the U. S. Geological Survey report for the area. Finally test drilling was conducted to determine the properties of aquifers present at the site. 5701 PENNY CIRCLE, ANCHORAGE, AK, 99516 jamunter@arctic.net PHONE (907) 345-0165; FAX (907) 348-8592 I A. MUNTER CONSULTING, INC. VICINITY ANALYSIS Aquifer Recharge and Water -Supply Potential Regional data indicate that average annual precipitation in this part of Anchorage is approximately 20 to 30 inches/year. Assuming that approximately 30 percent of 20 inches/year recharges groundwater, then an average of approximately 570 gallons per day is recharged on each of the six planned lots on the parcel. This amount of water is comparable to the Municipal requirement of 600 gpd for a 4 -bedroom home. These data suggest that on-site recharge of water alone is potentially sufficient to sustain aquifers with the quantity of water needed for subdivision use. Also, Dearborn and Barnwell (1975) studied the Anchorage Hillside hydrology in the vicinity of Raptor's Knoll Subdivision to determine the long-term potential yield of water -supply aquifers. They concluded that the sustainable yield of groundwater aquifers in areas underlain by glacial drift aquifers (such as this area) was in the range of 2-4 million gallons per day for their study area. This converts to 3,300 to 6,500 gallons per day for an area the size of the proposed development, or an average of 550 to 1100 gpd for each of the six planned lots. This is consistent with the recharge estimate provided above. Dearborn and Barnwell (1975) provide support for the concept that groundwater supplies in this area are likely sufficient to provide water for residential development on a sustainable long-term basis as proposed. Review of area well records The MOA's On-site files were searched for records from adjacent properties. (http://onsite.ci.anchorage.ak.us/scripts/LFWebLink.exe/weblink/browser.html) The WELTS well log database (http://www.navmgps.alaska.gov/welts maintained by the ADNR was also examined for well logs. Logs of eleven wells serving nearby residential properties were are shown in Table 1. Table 1. Summary of data for wells near Raptor's Knoll Subdivision. Location Well Well Reported yield or Estimated Aquifer Static water level depth Log flow rate and year transmis- type in feet below land (feet) Avail. of measurement sivity surface and year ? ( m) (gpd/ft) of measurement L 5C Iliamna 94 Yes 4 2007 230 Silty 59 2007 Acres Gravel, wet L 5D Iliamna 120 Yes 25 2006 850 Coarse 61 2006 Acres Gravel LI Iliamna 66 Yes 20 1983 2000 Gravel 46 1983 Acres L4A Iliamna 98 No 5.3 2012 140 Unknown 23 2012 Acres Timber Trail 169 Yes 3+ 2014 110+ Sand and 113 2014 Tr IB gravel Evaluation of aquifers at Page 2 of 7 December 1, 2014 Raptor's Knoll Subdivision, Anchorage, Alaska I A. MUNTER CONSULTING, INC. Location Well Well Reported yield or Estimated Aquifer Static water level depth Log flow rate and year transmis- type in feet below land (feet) Avail. of measurement sivity surface and year ? (gpm) ( d/ft) of measurement Kee -Too Yes 12 2003 320 Sand and 84 2003 Acres Tr B 158 Gravel 4.61+ 2014 120+ 82 2014 L2C Iliamna 63 Yes 16 1984 1400 Gravel 40 1984 Acres Kee -Too 183 No 5+ 1993 Not Not re - Acres Tr A calculable Unknown ported 183 5+ _ 2010 1 170+ 1 123 2010 Note: Estimated transmissivity (T) in gallons/day/ft calculated by T= SC x 2000 where SC (specific capacity) = yield (in gpm) /drawdown (in ft). Full drawdown is assumed where data were lacking, resulting in conservative (i.e. low) estimates of T. Summary of Well Record Review All eight wells in the vicinity were found to tap a sand and gravel aquifer, or logs were unavailable. Reported yields range from 3 to 25 gpm, and inspection of water -level data collected during different years shows that water levels in the aquifer have remained relatively stable. The median reported well yield is 5.3 gpm. This is approximately ten times the minimum required yield needed for a five bedroom home using the Municipality criterion of 150 gpd/bedroom. Reported static water levels range in depth from approximately 23 to 113 ft below land surface. Well depths range from 63 ft to 183 ft below land surface, with a median well depth of 120 ft. Calculated transmissivity values range from 140 to 2000 gpd/ft. The median estimated value of transmissivity is approximately 280 gpd/ft. This value is in the mid-range for a glacial sand and gravel aquifer of 5-10 foot thickness (Freeze and Cherry, 1979, p. 29). The well data provided above shows that wells in the near vicinity of Raptor's Knoll Subdivision appear to capable of supplying sufficient water to single family homes on an on-going basis. Summary of Vicinity Analysis. The proposed subdivision is located in an area where numerous wells already tap sand and gravel aquifers. Existing data show that the aquifer is not exhibiting water -level declines from existing development. Areawide water budget and potential aquifer recharge data also suggest that the aquifer has the potential to supply the water required for indefinite sustainable on-site use for the proposed Raptor's Knoll Subdivision. Evaluation of aquifers at Page 3 of 7 December 1, 2014 Raptor's Knoll Subdivision, Anchorage, Alaska J. A. MUNTER CONSULTINQ1 INC. SITE EVALUATION Test -Well Drilling Three test wells were drilled at the locations shown on the attached Test Well Plan. Logs of the wells are contained in the Attachments. For this report, the well drilled on lot 5 (235 ft deep) will be called Well 5, the well drilled on Lot 6 (204 ft deep) will be called Well 6, and the well drilled on Lot 2 (296 ft deep) will be called Well 2. Wells 5 and 6 tap sand and gravel deposits. As a result of the close proximity, similar depths. similar static water levels and materials penetrated, these wells are likely tapping the same aquifer. The aquifer is confined by many tens of feet of silty glacial sediments and is considered a confined aquifer. Wells 5 and 6 were developed by air-lift pumping, with estimated reported yields at the time of drilling of "20+" and "15+" gpm, respectively. Well 2 penetrated the same aquifer as the other two wells, however, development of the well through the open end of casing failed to develop silt free water. The well was then drilled deeper and penetrated a fractured bedrock aquifer that yielded approximately "10+" gpm. There appears to be greater fracturing and water yield of the bedrock at this location than in surrounding areas of the Anchorage Hillside. Dearborn and Barnwell (1975) showed the inferred location of the Border Ranges Fault Zone approximately 1/4 mile east of this site. The fractured bedrock encountered at Well 2 may be the result of the close proximity to the fault zone. although not shown on the attached well log, the static water level on December 1, 2014, was reproted to be 154 feet below the top of casing (Dave Harper, Oral Communication, December 1, 2014) Estimation of Aquifer Parameters Transmissivity of the sand and gravel aquifer. The estimated specific capacity of the test wells tapping the sand and gravel aquifer ranges from 0.27 to 0.24 gpm/ft of drawdown. Using the methods outlined Table 1, estimated transmissivity of the aquifer ranges from 480 to 540 gpd/ft. This is similar to but slightly greater than the median value determined from surrounding well records (Table 1). Transmissivity of the bedrock aquifer The estimated specific capacity of the Well 2 tapping the bedrock aquifer is approximately 0.067 gpm/ft of drawdown. Using the methods outlined Table 1, estimated transmissivity of the aquifer is approximately 140 gpd/ft. For 53 feet of aquifer penetrated, this yields an estimated hydraulic conductivity of the aquifer of 2.6 gpd/ft2, which is typical of a fractured igneous or metamorphic rock aquifer (Freeze and Cherry (1979, p. 29). Storativity Aquifer storativity can be estimated from literature values commonly determined for aquifers of these types. In confined aquifers, storativity, a dimensionless parameter, is commonly found to be in the range of 0.005 to 0.00005 (Freeze and Cherry, 1979). This range of values likely Evaluation of aquifers at Page 4 of 7 December 1, 2014 Raptor's Knoll Subdivision, Anchorage, Alaska J. A. MUNTER CONSULTING., INC. encompasses the value of storativity of both the sand and gravel and bedrock aquifers encountered by the test wells at this site. POTENTIAL EFFECTS OF NEW PUMPING A Theis (193 5) analysis was performed to estimate drawdown in surrounding wells from pumping new wells at Raptor's Knoll Subdivision. These calculations require certain simplifying assumptions. They assume that the aquifers are infinite in lateral extent without boundary conditions, are homogeneous and isotropic, and that recharge does not occur within the simulation time period. While these assumptions are simplifications of actual aquifer conditions, the Theis model is widely used and can provide an initial assessment of the magnitude of the likely effects of pumping on nearby wells. Sand and gravel aquifer The potential effects of pumping from the sand and gravel aquifer were simulated by assuming that all of the new pumping comes from a single well located at the center of Raptor's Knoll Subdivision. The rate of pumping is assumed to be 450 gpd/lot, or 2700 gpd for the six lots. The aquifer transmissivity is assumed to be 509 gpd/ft, which is the geometric mean of the two transmissivity values determined from Wells 5 and 6. The period of pumping is assumed to be 200 days. This time period represents a winter period of low recharge, after which it is assumed that additional water would be available from spring recharge. The aquifer storativity is assumed to be 0.0005, which is a mid-range estimate for a confined aquifer. Drawdowns are calculated from the center of Raptor's Knoll Subdivision to a hypothetical well located 300 feet away. The 2.5 acre lots surrounding Raptor's Knoll subdivision are square with approximately 330 feet width and length, so this distance represents an approximate lot -center to lot -center distance for adjacent lots. Using these parameters, the Theis model calculates drawdown of 2.8 ft after 200 days of simulated pumping. A review of the data in Table 1 shows that nearby wells have 20 to 74 feet of water standing in their casings under static conditions. This indicates that the effects of water use at the new subdivision are likely to be small on surrounding wells and that there is a large margin of safety in the analysis. A sensitivity analysis was conducted by simulating the same scenario except that a value of storativity of 0.00005 was used, resulting in a simulated drawdown of 3.7 feet. this is not considered to be a material difference in the result. Bedrock aquifer The potential effects of pumping from the bedrock aquifer was simulated by assuming that pumping from 4 wells (wells on lots 5 and 6 will be from the sand and gravel aquifer) from a Evaluation of aquifers at Page 5 of 7 December 1, 2014 Raptor's Knoll Subdivision, Anchorage, Alaska J. A. MUNTER CONSULTING, INC. single well located at the center of Raptor's Knoll subdivision. The rate of pumping is assumed to be 450 gpd/lot, or 1800 gpd for the four lots. The aquifer transmissivity is assumed to be 140 gpd/ft and the period of pumping is assumed to be 200 days. The aquifer storativity is assumed to be 0.0005, which is a mid-range estimate for a confined aquifer. Drawdowns are calculated from the center of Raptor's Knoll Subdivision to a hypothetical well located 300 feet away. Using these parameters, the Theis model calculates drawdown of 4.8 ft after 200 days of simulated pumping. Well 2 likely has more than 100 ft of available drawdown, and nearby bedrock wells would be expected to have a similar amount. This indicates that the effects of water use at the new subdivision are likely to be small on surrounding wells and that there is a large margin of safety in the analysis. Most wells in the Raptor's Knoll Subdivision are likely to tap a sand and gravel aquifer. A few wells may tap a bedrock aquifer. Both aquifers are considered highly like to provide sufficient water to meet MOA standards for new homes. Area -wide hydrogeology data show that water -level declines are not evident in the aquifer and that the local hydrologic regime appears to be adequate to support new water demands from wells as proposed. The analysis of potential impacts to surrounding well owners is considered to be sufficiently conclusive that ample water is available and that the effects of the proposed subdivision on surrounding well owners is sufficiently small that further aquifer testing, analysis, and modeling of the potential effects of new pumping is not warranted. CLOSING Should you have any questions about this report, please call me at 345-0165 or 727-6310. Sincerely, J. A. Munter Consulting, Inc. James A. Munter, CPG, CGWP Principal Hydrogeologist Certified Ground Water Professional No. 119481 Alaska Licensed Professional Geologist No. 568 Evaluation of aquifers at Page 6 of 7 December 1, 2014 Raptor's Knoll Subdivision, Anchorage, Alaska I A. MUNTER CONSULTING, INC. Attachments Test Well Plan Well logs, Lots 2, 5, and 6 References Cited Dearborn, L. L., and W. W. Barnwell, 1975, Hydrology for Land -use Planning, the Hillside area, Anchorage, Alaska, U.S. Geological Survey Open -file report 75-105. Freeze R. A., and J. A. Cherry, 1979, Groundwater, Prentice Hall, Englewood Cliffs, NJ, .M. Glass, Roy L., 1988, Map showing depth to bedrock, Anchorage, Alaska, U. S. Geological Survey Open File Report 88-198, 1 sheet, scale 1:25000. Theis, C. V., 1935, The relation between the lowering of the piezometric surface and the rate and duration of discharge of a well using groundwater storage: Trans. Amer. Geophys. Union, 2, pp 519-524. Evaluation of aquifers at Page 7 of 7 December 1, 2014 Raptor's Knoll Subdivision, Anchorage, Alaska 08/12/2014 05:31 507-345-0202 ALPINE DRILLING PAGE 01/01 Ine Rc fdv,5 K viol 1 Lo f Z E Drilling ri Permit Number: #SW 141501 Bate of Issue: 11-12-14 Parcel Identification Number: 01710155000 Date Started: 11-26-14 Bate Completed: 11-29-14 Is well located at approved pernalt location? x Yes ❑ No Legal Description: Timber Trail Lot 2 Property Owner Name & Address: Raptor Properties LLC 5725 Yukon Charlie Loop Anchorage Alaska 99502 Method of Drilling ❑ air rotary ❑ cable tool Borehole Data: Depth (ft) Soil Type, Thickness & Water Strata From To Casing type: steel ,Stick-up Gravelly silt fill 0 2 2 8 Wall Thickness: .250 inches Diameter: b inches Depth: 244 feet Liner Type: silt 8 17 Diameter: inches Depth: feet gravelly silt 12 63 Casing stickup above ground: 2 feet Static water level (froze ground level): feet sandy silt 63 71 cobbly silty gravel silt 71 79 79 85 Pumping level: 295 feet after 4 hours pumping 10+ gpm Recovery Rate: 1Q+ gpm gravelly cobbly silt 85 176 Method of Testing: air 11 sandy silt 176 190 Well Intake Opening Type: gravelly silt gravelly sandy silt 190 203 203 22¢ ❑ Open End x Open Hole ❑ Screened Start feet Stopped feet ❑ Perforations Start feet Stopped feet gravelly sandy silt wet 224 228 Grout Type: bentonite granules Volume: 2 bgs silty water, sand & gravel won't clear 228 230 Depth: Start 0 feet Stopped ? feet pump: Intake Depth feet gravelly silt wet 230 243 bedrock highly fractured 243 296 Pump size hp Brand Name Well Disinfected Upon Completion? x Yes ❑ No Method of Disinfection: chlorine tablets Comments: Well Driller: Alpine Drilling & Entzrprises PO Box 110496 Anchorage AK 99511 06/07/2014 07:07 907-345-0202 ALPINE DRILLING PAGE 01/02 l in r[lin Well PermitNamber: 9SW141499 Date of Issue: 11-10-14 Parcel Identiflcati.on Number: 91710155000 Date Started: 11-13-14 Date Completed: 11-14-14 Is well located at approved permit location? x Yes ❑ No Legal Description: Timber Trail Lot 5 Property Owner Nance chi Address: Raptor Properties LLC 5725 Yukon Charlie Loop Anchorage, Alaska 99502 Borehole Data: Depth (ft) Method of Drilling x air rotary ❑ cable tool Soil Type, Thickness & Water Strata From To Casing type: steel Stick-up 0 2 Wall Thickness: .250 inches silt gravelly cobbly silt 2 9 9 38 Diameter: 6 inches Depth: 23S feet Liner Type: Diameter: inches Depth: feet sandy silt 38 57 Casing stickup above round: 2 feet Static water level (from bound level): 148 feet cobbly silts- gravel 57 65 silt 65 i6 Pumping level: 230 feet after gravelly cobbly silt 76 155 ? hours pumping 20+ gpm Recovery Rate: 20+ gpm cobbly gravel 155 163 Method of Testing: Air lift sandy silt 163 173 Well Intake Opening Type.- ype:gravelly gravellysilt silty water sand &gravel 173 728 228 235 x Open End ❑ Open Hole ❑ Screened Start feet Stopped feet ❑ Perforations Start feet Stopped feet Grout Type: bentonite Volume: 2bp-s Depth: Start 0 feet Stopped ? feet Pump: Intake Depth feet Pump size hp Brand Name Well Disinfected Upon Completion? x Yes ❑ No Method of Disinfection: chlorine to lets Comments: Well Driller: Alpine Drilling & Enrerprlses PO Box 110496 Anchorage AK 99511 08/07/2014 07:07 907-345-0202 ALPINE DRILLING PAGE 02/02 MpMe Dralfong & Enterrpftas r1ermit Number: 0SW 41500 Date of Issilea 11-12-14 paweel gdetnffleadon Num ber: 01710155000 Date Started: 11-17-14 )[Date Com pRetede 11-18-1 4 Is well located at approved pennit location'? x Yes ❑ No ]Legal Description: Timber Trail Lop 6 property Owren Name & Address: Raptor Properties LLC 5725 Yukon Charlie Loop Anchorage, AK 99502 Borehole Data: Soil Type, Thickness & Water Strata BDeptb (fit) From To Method of Drillinff x air rotary ❑ cable tool Casing type: steel stick -zip Gravelly silt 0 2 2 IZ Wall T: hicl ness:.250 inches Diameter: 6 inches Depth: 204 feet Liner 'Type: Gravelly cobbly silt I2 40 piameter: inches Depth.: feet sandy silt cobbly silt), gravel salt gravelly cobbly silt 40 59 66 77 59 f 66 77 160 Casing stickup above ground: 2 feet Static grater level (from ground level): 145 feet pumping level: 200 feet air 2 hours pumping 15+ gpr a Recovery Rate 15+ gpzn cobbly gravel 160 165 Method of Testing: —air -1-19 IvVell Intake Opening 'Type: x Open End ❑ Open; Hole ❑ Screened Startfeet Stopped feet ❑ perforations Start feet Stopped feet sandy silt 165 171 gravelly silt 171 199 sidfy water sand & gravel 199 204 Grout Type: bentonitea� Volume: 22 ba?s De Start 0 feet Sto ed ? feei Vamp: Intake Depth feet Pump size hp Brand Name Well Disinfected Upon Completion:' x Yes ❑ No Method of ADisinfectiOn: chlorine tablets Comments; Well Driller: Alpine Drilling & Enterprises PO Box 110496 Anchorage AK 99511 Page 1 of 1 Wockenfuss, Deborah M. From: McGee, Lynn M. Sent: Friday, October 31, 2014 10:50 AM To: Wockenfuss, Deborah M. Cc: Crewdson, James A. Subject: Raptors Knoll Subdivision; Wells in Drainage and Slope Easement. Deb: As you stated the developer plans to place wells on Lots 3-6 in a 30' Drainage and Slope Easement around the cul de sac to meet separation distances from the septic reserves. Please convey to the surveyor or engineer that easement is not currently shown on the preliminary plat for the development and must be presented to the Planning Section prior to approval and recording. We understand they want to drill the wells next week. As long as the engineer ensures the proposed grade and drainage ditches are not affected by the well locations we do not object in principle. Once the Letters of Non -objection are applied for we will process and issue them to the property owner. Thanks, Lynn M. McGee Senior Plan Reviewer Right of Way Section mcgeelm@muni.org 343-8226 343-8250 (fax) 10/31/2014