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Home My WebLink AboutBIRCH GROVE Lot 1A S12103Onsite File �- Rodney P. Kinney Associates, inc. Consulting Engineers a Surveyors November 3, 2014 Municipality of Anchorage Onsite Water and Wastewater 4700 Elmore Road Anchorage, AK 99507 Attention: Ms. Deb Wockenfuss Reference: S12103 Birch Grove Subdivision IA -2 Dear Ms. Wockenfuss: 14 -CK -1746 Rodney P. Kinney Associates, Inc. (RPKA) performed percolation testing, water level monitoring, and soil test pit logging in the Birch Grove Subdivision IA and determined that there is sufficient septic system area available to meet the requirements of MOA Code 15.65.180 and that required separation distances from existing and proposed wells are met. A signed and stamped percolation test log and a Site Plan to scale with contours that show the percolation test location for the proposed subdivision are included with this letter. The Site Plan, Figure 1, shows and demonstrates the following. 1. There are no developments on the proposed Lot IA -2. 2. The approximate locations of the proposed house, well, and septic system and locations of existing houses, wells, and septic systems within 200 feet. The drawing shows that wells and septic systems on neighboring lots are located at greater distances than 100 feet from proposed well and septic system. 3. There are no conflicts with existing surrounding water supply well and septic systems. 4. Sufficient existing reserved areas per MOA Code 15.65.180 meet separation requirements from existing and proposed property lines, proposed wells, and existing wells. 5. All land within 50 feet downslope of sufficient available area is sloped less than 25%. 6. There are no surface waters within 100 feet of any of the proposed septic system areas. The depths from surface to groundwater after the seven-day stabilization and monitoring period is indicated on the percolation test log and summarized below along with the percolation test result. TH-1: 16 feet soils investigation depth and seven-day groundwater stabilization and monitoring. Percolation Rate = 22 minutes per inch (mpi) from 4.5 to 5.5 feet'below the ground surface. No water was encountered while digging and no water was encountered in the standpipe to the bottom of the hole after seven days. 16515 Centerlield Drive ■ Suite 101 ■ Eagle River, Alaska ■ 99511 907.694.2332 111 Fax 907.694.1807 0 www.rpka.net Birch Grove Subdivision, Lot 1A-2 Septic System Area Investigation Page 2 of 2 t> -. Project Engineer Enclosures GAE:djm LEGEND 520 10' CONTOUR 2' CONTOUR EXISTING PROPERTY LINE PROPOSED PROPERTY LINE s SEPTIC SYSTEM, APPROXIMATE LOCATION ® EXISTING BUILDING, APPROXIMATE LOCATION ® PROPOSED BUILDING, APPROXIMATE LOCATION -�- EXISTING WELL, APPROXIMATE LOCATION PROPOSED WELL, APPROXIMATE LOCATION TH-1 TEST PIT NUMBER AND LOCATION > DRAINAGE ARROW SEPTIC RESERVE (14,161 S.F. SHOWN) — — — — APPROXIMATE CREEK CENTERLINE WITH 65' STREAM PROTECTION SETBACK IN WETLANDS AREA AND 25' STREAM PROTECTION SETBACK IN UPLANDS AREA OF ®�. 1� 49TH .p '. Rodne P. Kinney Jr.: ti �1• '• CE7955 GRAPHIC SCALE 200 0 '°° 200 1 inch = 200 it (&wrKABIRCH ' ROBERT AND TRUDY CARLSONLOT P.O. BOX 771375 EAGLE RIVER, AK 99577 MOA PLATTING CASE No. S12103 GROVE SUBDIVISION LOCATED A-2� WITHIN NW 1/4, SECTION 16, T14N, R1 W, S.M. ON-SITE SEPTIC & WELL SITE PLAN °"°"°" FIGURE 1 �� K wom". RPK �,s NOVEMBER 06, 2014 a «",• 1'=200' Performed For Legal Description Depth Municipality of Anchorage Development Sewices Department Building Safety Division On -Site Water and Wastewater Program 4700 Elmore Road P.O. Box 196650 Anchorage, AK 99507 www.ci.anchoraoe.ak.us (907) 343-7904 a ° • ° • �dt. 7 6,�V (ENGINEEl3!,Sf,`'S`EAQ } F � e `� e e l �d LVA ° • "44 • ° �` �� r:r Gi 23 �-+�:f'i• NA, 4��'� - Soils Log - Percolation Test �'_ , `� ( /+ �' 1--r�lv t &,4 /�I^/�Gt,N (:5 a-;,,, Date Performed: -�1O /Z ` • �•�� Q Z�/ �'� �-Of i At j3j V -e_ ( G Y'4 Ve_ 5 Township, Range, Section: / 4- tQ Slope Site Plan -5 I VC6,4s Y U �,c. C� 2- 3- 4 5 e »Le GB s►�b r -mo_ l rQ S,tl,�yzArl 11 G'. 7- 4. 5-toj, d`�� I a`% Z.S�t�-U- 8- (xQ1�c �t e.� cav"t.+ -y WAS GROUND WATER 9- - �.�+`SI� ENCOUNTERED? 10-1- 12- 13- 14- 0- 12-13-14- 20-1 Date Gross Time Net Time DeptVIo.WEkter Net Dro 0 6ro,i 1 15- 6- 16- d �YIGt V a. 167 • b � 17- 17- /t7 -ZZ--I4 fi. � � �z4� c9 rGaol O Sr� 18- 18- 19- 19- 20-1 1 COMMENTS s IF YES. AT WHAT DEPTH? '� t 0 Depth to Water After }— P Monitoring? N'o Wa a—V E Date: o Reading Date Gross Time Net Time DeptVIo.WEkter Net Dro I /t7 -ZZ--I4 ®30 O ZZ nit 3245 4- 1019 PERCOLATION RATE ;?_Z- " (mmules4nch) C PERC HOLE DIAMETER TEST RUN BETWEEN 4 . �FT AND 5 , 7 FT PERFORMED BY: 911 �_ P\- I ap_r- e_ CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: /e ZZ 14 RodneyKinnevissociates,P. inc. Consulting Engineers a Surveyors November 3, 2014 Municipality of Anchorage Onsite Water and Wastewater 4700 Elmore Road Anchorage, AK 99507 Attention: Ms. Deb Wockenfuss Reference: S12103 Birch Grove Subdivision IA -2 Water Availability Summary Dear Ms. Wockenfuss: 14 -CK -1746 The proposed subdivision of Birch Grove Lot IA into two lots should not negatively impact surrounding water availability. It is our opinion that the local aquifer supplying the wells of adjacent lots to the west and east and four undeveloped lots to the south is adequate to also supply the subject subdivision, proposed Lot IA -2, Birch Grove Subdivision. There are six lots developed with on-site water and sewer services in the area surrounding Lot lA-2, Birch Grove Subdivision. These are: 1. A 12.6 -acre lot in Section 17 to the northwest of Lot IA -1, Birch Grove Subdivision, 2. The 20 -acre Birch Grove Lot 2 on the north, 3. The 28.4 -acre Birch Grove Lot 1A, from which this approximately 4 -acre lot is split, reducing the 28.4 -acre mother lot I to approximately 24.4 acres and named Lot lA-1, 4. Lot 19, Lot 25, and Lot 26, the three smaller lots of Sunny Valley Subdivision to the east. Well information about these lots from T14N, R1 W is tabled below. Table 1 16515 Centerfield Drive ■ Suite 101 ■ Eagle River, Alaska s 99577 907.694.2332 1 Fax 907.694.1807 1 www.rilka.net Location Static Water Casing Approx. Well Lot Legal Approximate Relative Well Log Level Depth Well Yield Depth Depth Number Description Size (acres) to Lot 113 (Yes/No) (feet) (GPM) (feet) (feet) 1 E2NE2NE4 12.6 northwest No 6 20 20 50 Section 17 2 Lot 2 20 north Yes 45 20 85 86 Birch Grove 3 Lot 19 2 east Yes 61 25 152 153 Sunny Valle 4 Lot 25 3 east No 47 8.9 40 51 Sunny Valle 5 Lot 26 2 east Yes 16 40 80 80.5 Sunny Valle 6 Lot IA -1 24.4 west Yes 90 50 221 222 Birch Grove 16515 Centerfield Drive ■ Suite 101 ■ Eagle River, Alaska s 99577 907.694.2332 1 Fax 907.694.1807 1 www.rilka.net 512103 Birch Grove Subdivision, Lot 1A-2 Water Availability Summary Page 2 of 2 Grove. If you have any questions, please contact me at 694-2332. Sincerely, RODNEY P. KINNEY ASSOCIATES, INC. ' Greg Eberle, PE Project Engineer GAE:djm