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HomeMy WebLinkAboutBILLI JEAN S12570Onsite File b � s t',q 4O,y3N:T�tIG �y4� R• +K r�s71 •n March 4, 2021 RC T:RRA CONSULTING, INC 20441 Ptarmigan Bld, Eagle River, AK 99577 Office (907) 696-6111, Fax (907) 868-3793 Ms. Deb Wockenfuss Municipality of Anchorage Onsite Services P.O. Box 196650 Anchorage, AK 99519-6650 Subject: Final Plat Billi Jean Subdivision Lot 48A & 48B (Case #12570) Dear Ms. Wockenfuss, The proposed subdivision is located south of Peters Creek east of the Glenn Highway in Chugiak. This property is relatively flat sloping north and east toward Peters Creek less than 10% across the entire area. While there is no requirement per the platting Summary of Action you have requested the developer to demonstrate the availability of water to serve the new lot and a report of nitrate levels within 250 feet of the proposed subdivision. We researched the available on-site records for existing wells and have identified three neighboring wells along with the existing well on this property to determine production rates and nitrate levels recorded. The following is a summary of the existing well information: Location Well Production Nitrate levels ( m) (m / 1) Date reported Lot 48A (This subdivision) 5.2 0.90 3/09/2020 Lot 47A (west) 6.5 1.21 6/20/2011 Lot 1 Nauman Sub. (sou th) 10.2 0.77 7/13/1992 Lot 42 (north & west) 3.5 1.26 4/17/2007 It is our opinion that one additional well in this area shall have no noticeable impact on the existing wells and shall produce adequate water to meet municipal on-site standards. We see no indication of groundwater nitrate levels that pose a health concern from the existing or proposed septic systems within the area. If you have any questions, please contact me at 696-6111 or info@arcterra.net. Respectfully Keruieth X. DufXs, P.E. Attachments: On -Site well records noted 20441 PTARMIGAN BLVD ° EAGLE RIVER, AK 99577-8736 • PH (907) 868-3791 • FAX (907) 868-3793 APPROXIMATE WELL LOCATIONS T15N R1W SEC 4 LOT 48 d a $ L - . W rtaK RSQNARII aY R.¢A RCi5lYlcMft ee anc Ia�ii� w Rnc ra�vnm� w nnc ezti�x�aerM I OT 42 VACANT .ar LOT 47 $ $ I VACANT lr LO B j LOT 49 r) a LOT A L +78 _ VACANT Yf en• ISS]NAQi� No VEIL NO3EPDC NY2 LOT 28 LOT 2B LOT,4A R e d $ K w AAUMAN SUED Plat 92 —69 LOT t AW �� ©� 1Q , to �� 4 ILI* KE' $ CE -711$ �� f p� .0 PESS100 PREPARED FOR1 GARY PERKINS PO BOX 670263 CHUGIAK, AK 99567 FIELD BOOKS COMPUTED: BOUNDARY: A DRA": KSD STMNC: N A CHECKED: KMD 58 AUILT: -SLS DAM*3 12 owc. RLE-.aa0: N W14° ACAD FILE` FILE 108 "° 19087 Jr iIr r t Scale: 1'= 500` PAGE 1 OF 1 WASTEWATER DISPOSAL SYSTEM AREA PLAN T15N R1W SEC 4 LOT 48 53,659 SQ\FT n LOT 48B Ij� 14.000 SQFT 1 SEPTIC AREA t z �' StiP I Q N 0) Li c i s 1 I i - LOT 8A � �z I- 45,365 SQ FT E I w Q I -- o �EL n �Lc) o Lo 10 T&E 8c GAS ESMT-77D ' n n �e1 nrni n rrn 0 Scale; 1'= 50' m NOTE, FIELD VERIFIED NO SLOPES .?-25% WITHIN THE PROPOSED SEPTIC AREA. PAGE 1 OF 1 i 4 PREPARED FUR; OF AL 41�. GARY PERKINS PO BOX 670263 491. CHUGIAK, AK 99567 �} KENNETH M. D } S FIELD BOOKS couaulm: is2 CE—•x/115. w� BOUNDARY:.. N A DRA": KSD SfAaNG N/A CHECKED: KMD p3'' AWUILT: SLS DAIS: 3/12 sSla DWG. FILE: GMD: NW14: ACRD RLE: FILE I "No"' 19087 WASTEWATER DTSPOSA- SYSTEM AREA PLAN T15N RlW SEC 4 LOT 48 cn CN Li 0 In 3[&[e: 1^= 50' FLAG PROPERTY LINES WELL RADII & EASEMENTS DESIGN DETAILS PRIOR TO CONSTRUCTION 3 BDRN X 150 GPD = 450 GPD 450 GPD/0.8 GPD PER 3Q. FT.= 562 SQ. FT (750 / 5') = 113 FT. TRENCH USE 2 TRENCH' 72' (L) X 5' (V) X 0.5' (D) Totui depth of system Is 3' max from original grade. Total.depth of gravel,beio* distribution pipe Is 0.5'. NOTES: 1- TRENCH MAY REQUIRE MOUND TO MEET BURIAL REQUIREMENTS. 2. INSULATE TRENCH WITH 2~ HD BURIAL FOAM IF < 3' OF FILL MIN, 2' FILL WITH INSULATION, )3' COVER NO INCUL REQ, PREPARED FOR` GARY PERKINS PO BOX 670263 CHUGIAK, AK 99567 FIELD BOOKS compula. ASBUILT: SLS DATE. 3/2/21 M. FILE MD: NW1458 PAGE 2 OF 2 OF AZ '1 ARcTr,R' R' Ahs ter. s CONSULTING, I TC * 4 TE f r� b 20441 Ptarmigan, Eagle River,AK 99577 ver^ Office (907) l 696-6111, Fax (907) 868-3793 f" ,Kv.Tr�S KENNETH M. UEF a 'r t SOILS PERCOLATION TEST Performed for: Garry Perkins Date Performed: -__ 04/29/2020 Project: ie1____------ _.T-15NR1W_SEC 4 LOT 48 PERC #1TESTHOLEIt TH 2O-1 Depth (Feet) SEE ATTACHED SITE PLAN oRG FOR HOLE LOCATION 1 Silt — PERC BENCH #I GM/SC 7'- 8' Cobbles to 'fi" — 3/a" 8'- 9' Cobbles to 1" — 1 'h" B.O.H. 9' 10- H- 12- 13- 14- 15- 16- 17- 18- 19- 20 - HOLE PRESOAKED PRIOR TO TESTING Was Ground water encountered? YES What depth? 7' Depth to water after monitoring? 4'11" Date? 5/5/20 Reading Date Gross Time Net Time Depth to Water Net Drop 1 4/29/20 4:45 - 7" - 2 4:55 10 min 6" 11, 3 * 4:56 - 7" - 4 5:06 10 min 6" t" 5 * 5:07 - 7" 6 5:17 10 min 6" 1" 7 * 5:17 - 7" - 8 5:27 10 min 6" 1" 9 * 5:28 - 7" - 10 5:38 10 min 6" F, 11 * 5:39 - 7" - 12 5:49 t0 min 6" 1" * Water Added Percolation Rate 10 (min/in) Pere Hole Diameter 6" Test Run Between 2 feet and 2.5 feet I, Kenneth M. Duffus, certify that this test was performed in accordance with all State and Municipal guidelines in effect on this date. �� (�1 ,L8'6ZC M„00,90.00N) L L CG co ,8L'6ZC M„CO,O WON C�`��y��l� 4) rn a)x o------ ,8 L'9 L G �•ss o 'd110 C12 +/ �� tea' a��� .p•Z x �OS � � m 4 o rn x OR oo�oco L ; C'4 x 0 I Y �' Y CL „iX� F-� ' in i 00 V O X Q oo "�"�� �/1 .0o. x F U a °8 Oot O' Q !� aTa�% o p�Z c. w w ��.., x F6 ryry v �N II II ��� ;r k 1 W w .. °°u rn o ooto k.i �z b =w I wn � ' ; � G N O xti N h��J� a Z (�. ^�� p®� es a _.00 ._._ om Ln w N if7 � qp x i— "0 .,, oma, b 000 0') i +\ so m z x� + `,•opt / �\ O k” d X x �+ Cb Q O c3 rn N � � � a 00 cUx � o - � = o N �md i{x n ti a� c x p�JC' Aej 3 c j N c o ff I r— 3 ti ,n i... cC • � m o�� lQp o6 s: M5 60.�ON x X O cW,h p E'�+`W H y a o 2 m ix------- ------------- -� X a� �•3 L o o D M„00,90.00N) — a CJ 3 v o z Z N O ;aa CJS ^ - Ove I -VZ '6Z M 5-b 60.00N N �” a o° R o a