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HomeMy WebLinkAboutTHUNDERBIRD FALLS #1 Lots 1 - 5 S-10572Thund rbird Falls Lots 1- 5 #5-10572 20441 PTARMIGAN BLVD. EAGLE RIVER, AK 99577-8736 (907) 696-6111/FAX (907) 696-8111 August 22, 2001 James Cross, PE Program Manager, Municipality of Anchorage Development Services Department On-Site Water & Wastewater Program P.O. Box 196650 Anchorage, AK 99519-6650 RE: S-10572 Thunderbird Falls S/D -- DSD COMMENTS Dear Jim: We are submitting the requested information for the above referenced property for your review and approval. Attached is the topographic information, proposed septic reserve areas with corresponding soils, and water availability data of properties in the immediate vicinity. Due to shallow bedrock, 2 of the 5 lots septic systems would consist of bottomless sandfilters. The attached information is based on on-site investigation and MOA records, and in accordance with said information, each of the proposed lots of the referenced property satisfy the requirements specified by AMC 21.15 and AMC 15.65. DSD well data shows the average yield for the surrounding area to be in a range from 2 GPM to 25 GPM. With the exception of a small portion of area located in the northeast part of the property, the proposed subdivision has gentle slopes of 5 to 10%. We respectfully request a plat signoff for item 6 of the above referenced plat. If you have any questions, please contact me at 696-6111/FAX 696-8111. Respectfully submitted, KND Engineering Attachments: As noted WELL SYSTEM DETAILS/SITE PLAN WASTEWATER THUNDERBIRD DISPOSAL FALLS LOT i 85,643 sI. ft. 1.97 acres sq. ft. 1.26 ocres 137.786 ,3.16 I DESIGN DETAILS 4 BDRM X 150 GPO = 600 GPO AREA OF FILTER = 10' x 36' : 360 SO.FT. GO0 gpd / 360 sq. Ft. = 1.67 gpd/sq. Ft. 1.67 gpd/sq. Ft. < 8.0 Total depth oF system is 4.5' FrOM original grade. To*al depth oF gravel Ioelow distribution pipe is 0.5' . NrlTES: 1. USE 1850 GAL. SEPTIC TANK AND INSULATE IF ( 4' OF COVER. 8. INSULATE TRENCHES WITH 2' HD BURIAL FOAM. 3. CONTRACTOR WILL ENSURE MINIMUM 2% SLOPE INTO SEPTIC TANK. 4. ADDITIONAL FILL WILL BE ADDED OVER SYSTEM TO ACHIEVE MIN. 3' COVER IF REQUIRED. 5. CDNTRACTDR WILL ENSURE ALL SEPARATIDNS TD ADJACENT WELLS & SEPTICS. PREPARED FOR: LEONARD KELLY 881 N STREET SUITE 806 ANCHORAGE, AK. (907) 876-8185 FIELD BOOKS CO.PUleD: eouao~v:. HORAN DRAM~I: VBG S~Am~ HORAN ~g~o: KMD ~T: HORAN ~*~: 8/13/01 ~: ~: NWl 764 ~ ~[: 99091,DWG ,~e ,~: 990gi ScoJ, e: 1'= 100' PAGE 1 OF 8 ~ ~ ~') ENGINEERING ~0441 PTARMIGAN BLVD. EAGLE RIVER, AK 99577-8736 (907)696-611 t/FAX (907)696-8111 WASTEWATER DISPOSAL THUNDERBIRD FALL§ LOT ! SYSTEM DETAILS 3 © SAND 2 PREPARED FOR: LEONARD KELLY 821 N STREET SUITE 206 ANCHORAGE, AK. (907) 276-8185 FELD BOOKS c~D: e~NO~Y: HORAN o~^~: VBG ST~ HORAN ~z~¢~ KMD ~T: HORAN o*~: 8/13/01 ?,L~: ~,o: NWl 764 99091,DWG ~oe NO.: 99091 Sc(1Le: 1'= ;20' PAGE ;2 OF 2 ~/zAx (oo?)s~-~ ~, Performed for: Project: Depth (Feet) SOILS PERCOLATION TEST Leonard T. Kelley NWl/4, NWl/4, NWl/4, Sec36, T16N, R1W, SM Org/SM - red/brown, sandy gravel, silt w/organics, moist TEST HOLE # 00-1 SEE ATTACHED SITE PLAN FOR HOLE LOCATION SM]ML - brown, med. dense Was Ground water encountered? NO Depth to water after monitoring? 9.5' Reading Date 6- 1 GP -gray, cobbles to 1', moist 7- 2 8- 3 9- 4 B.O.H. Bedrock 4/12/00 What depth? NA Date? 4/19/00 12- Gross Net Depth to Net Time Time Water Drop 3:30 9" 4:00 30 rain 8 7/16" 9/16" 4:00 8 7/16" 4:30 30 min 7 14/16' 9/16" 4:30 7 14/16' 5:00 30 rain 7 5/16" 9/16" 13- 14- 15- 16- 17- 18- * Water Added 19- 20- HOLE PRESOAKED PRIOR TO TEST Percolation Rate 53.33 (rain/in) Perc Hole Diameter__ Test Run Between 2.5 feet and 3.5 feet I, Kenneth M. Duffus, certify that this test was performed in accordance with all State and Municipal guidelines in effect on this date. WELL WASTEWATER DISPOSAL SYSTEM THUNDERBIRD FALLS L[]T 2 3 53,334 DETAILS/SITE PLAN sq. ft 1.26 ocres F 137,786 3.16 ~s DESIGN DETAILS 4 BDRM X 150 GPO = 600 GPO AREA I1F FILTER = 10' x 36' : 360 SQ,FT. 600 gpd / 360 sq.?t. = 1.67 gpd/sq. Ft. 1.67 gpd/sq. Ft < 8.0 Total depth oF sys'tem is 4,5' ?rom original grade. To't;at depth o? gravel below distribu-t;ion pipe is 0.5' , NOTES: 1. USE 1250 GAL. SEPTIC TANK AND INSULATE IF < 4' DF COVER. 2. INSULATE TRENCHES WITH 2' HD BURIAL FOAM. 3. CONTRACTOR WILL ENSURE MINIMUM 2X SLOPE INTO SEPTIC TANK. 4. ADDITIDNAL FILL WILL BE ADDED OVER SYSTEM TD ACHIEVE MIN. 3' COVER IF REQUIRED. 5. CONTRACTOR WILL ENSURE ALL SEPARATIONS TD ADJACENT WELLS B, SEPTICS. PREPARED FOR: LEONARD KELLY 821 N STREET SUITE 206 ANCHORAGE, AK. (907) P76-8185 FIELD BOOKS CO~PU~D: ~OUN~A~ HORAN oeA~: VBG ST~IN~ HORAN ~[~Eo: KMD ~LT: HORAN oA~: 8/13/01 ~ RL[: ~0: N~ 764 ~ r,.e ggogl ,DWG .,ow N*.: 99091 Scale: 1'= 100' PAGE 1 OF 2 (907)696-611 i/FAX (907)696-8111 ~/ASTE~/ATER DISPOSAL THUNDERBIRD FALLS LOT 2 ,,,,C SYSTEM DETAILS PREPARED FOR: LEONARD KELLY 881 N STREET SUITE 206 ANCHORAGE, AK, (907) 276-8185 FIELD BOOKS co~*¢,u ~t ~. eo~co,~v: HORAN ~: VBG S~A~,N~: HORAN ~[o: KMD *~ILT: HORAN o*~: 8/13/01 ~'~: ~m NWl 764 99091,DWG ~ ~': 99091 Scare: 1'= 80' PAGE 8 OF 2 (907)696-6111/FAX (907)696-8111 ~D ENGINEERING 20441 PTARMIGAN BLVD. EAGLE RIVER, AK 9957%8736 Performed for: Project: NIN1/4, NWl/4, NWl/4, Sec36, T16N, R1W, SM Depth (Feet) 1- OrgfiVIL - red/brown, moist 2- 9- 10- 11- 12- 13~ 14~ 15- 16- 17- 18- 19- 20- SOILS PERCOLATION TEST Leonard T. Kelley SP - gray, med. dense, sand w/ gravel and cobbles to 8" SM/ML - -- ;B.O.H. Bedrock HOLE PRESOAKED PRIOR TO TEST Kenneth M. Dvffus CE 7116 What depth? NA Date? 4/19/00 Depth to Net Time Time Water Drop 1 4/13/00 1:00 9' 2 1:30 30 rain 6' 3" 3 * 1:31 9" 4 2:01 30 rain 6" 3' 5 * 2:02 9" 6 2:32 30 rnin 6" 3" Date Performed: 4/12 TEST HOLE # 00-2 SEE ATTACHED SITE PLAN FOR HOLE LOCATION Was Ground water encountered? NO Depth to water after monitoring? DRY Reading Date Gross Net * Water Added Percolation Rate 10 .. (rain/in) Perc Hole Diameter.__ Test Run Between 2 feet and 3 feet I, Kenneth M. Duffus, certify that this test was performed in accordance with all State and Municipal guidelines in effect on this date. /ELL /ASTEWATER DISPOSAL SYSTEM DETAILS/SITE PLAN THUNDERBIRD FALLS LOT 3 Z 55 4 sq, ft. :l'eS 5 ,.~ 85,643 s( 53,334 1.97 oc USE 1250 GAL SEPTIC TANK AND INSULATE IF < 4' DF COVER. INSULATE TRENCHES WITH 2' HI) BURIAL FOAM, CONTRACTOR WILL ENSURE MINIMUM ;:>7. SLDPE INTD SEPTIC TANK. ADDITIONAL FILL WILL BE ADDED OVER SYSTEM TD ACHIEVE MIN. 3' COVER IF REQUIRED. CONTRACTOR WILL ENSURE ALL SEPARATIONS TD ADJACENT WELLS & SEPTICS. sq, ft. ~ J[ 1.26 ocres ~ a 1 137,786 DESIGN DETAILS 4 BDRM X 150 GPI) : 600 GPO 600 GPO/1.2 GPO PER SQ. FT. (1.6 MIN/IN.): 500 SQ. FT (500/15'(W)) (0.5' GRAVEL) = 33.3 FT. BED USE 1 BED - 34 (L> X 15' (WI X 0.5'(D> Tot(il depth oF system is 3.0' From origin(il grc~de. Total depth oF gravel below distribution pipe is 0.5' . NDTES: 1, ;:>. 3. 4. Stele: 1'= 100' PAGE 1 DF 2 PREPARED FDR: LEONARD KELLY 8;:>1 N STREET SUITE 206 ANCHORAGE, AK. (907) 276-81B5 FIELO BOOKS eOUNO~m~. HORAN oR^~: VBO ST~.~ HORAN ~z~o: KMD A~LT: HORAN o*~: 8/13/01 o~ n~: ~: NWl 764 99091.DWG .~e.~: 99091 (907)696-611 I/FAX (907)696-8111 ~/ASTE~/ATER DISPF1SAL THUNDERBIRD FALLS LOT 3 SYSTEM DETAILS 3 PR H 3 PREPARED FOR: LEONARD KELLY B2! N STREET SUITE 206 ANCHORAGE, AK. (907) 276-8185 FIELD BOOKS eo~oAw* HORAN o~,~'~: VBG ST~ HORAN ~E~ KMD ~,LZ: HORAN o~: 8/13/01 o~ n~: ~o: NWl 764 99091,DWG .~e,o.: 99091 Scc~[e: 1'= 20' PAGE 8 OF 2 ]~D ENGINEERING 2044, PT*R,IGAN ,LVD. EAGLE RIVER, AK 99577-8736 I~.~:~:~:<~:~;~;:~}~Z~:~:~}:~}~:~:~:~:.}~.~::~:<~:~:7 ~'~' ~'::'~:~:~:;:~:~'~:::~:~I~:~':::~:~;:~I~:~:;;'::~[ (90'/)696-6111/F&X (907)696-8111 ~k~[D ENGINEERING 20441 PTARMIGAN BLVD. EAGLE RIVER, AK 99577-8736 Performed for: Project: Depth (Feet) 1- 2- 3- SOILS PERCOLATION TEST Leonard T. Kelley NWl/4, NWl/4, NWl/4, Sec36, T16N, R1W, SM Org/SM - red/brown, sandy gravel, silt w/organics, moist '~'~.'~ Ken e . M. Duffus/ ~ ~ Date Performed: 4/12 / TEST HOLE # 0O-3 SEE ATTACHED SITE PLAN FOR HOLE LOCATION Was Ground water encountered? NO What depth? NA GW - gray, loose, round cobbles toS' Depth to water after monitoring? 8.6' Date? 4/19/00 Reading Date Gross Net Depth to Net 5- Time Time Water Drop 6-- 1 4/13/00 1:40 7" SM/ML - silt, platelets at 7- bottom of hole, 2 1:50 10 min 13/16" 6 3/16" density increasing w / depth 8- 3 * 1:51 7" 9- -- B.O.H. Bedrock 4 2:01 10 min 15/16" 6 1/16" 10- 5 * 2:02 7" 11- 6 2:12 10 m'm 14/16" 6 2/16" 12- * 2:13 7" 13- 2:23 10 rain 1" 6" 14- * 2:24 7" 15- 2:34 16~ * 2:35 10 rain 15/16" 61/16" 7t~ 17- 2;45 18- * Water Added 10m in 15/16" 6 1/16" 19- Percolation Rate 1.65 (min/in) Perc Hole Diameter HOLE PRESOAKED 20- PRIOR TO TEST Test Run Between 3 feet and 4 feet 6~ I, Kenneth M. Duffus, certify that this test was performed in accordance with all State and Municipal guidelines in effect on this date. /ELL & /ASTE /ATER DISPOSAL SYSTEM DETAILS/SITE PLAN THUNDERBIRD FALLS LOT 4 ,] 3 53.334 sq. ft 1.26 ocres 4 sq. ft. res 5 85,643 sq. fi. 1.97 ocres ~ ~ 137,786 DESIGN DETAILS 4 BDRM X 150 GPD = 600 GPO AREA DF FILTER = 10' x 36' = 360 SQ.FT. 600 gpd / 360 sq.F't, = 1.67 gpd/sq.F't. 1.67 9Pd/sq. Ft. < 2.0 Tot(il depth oF system is 4.0' From origincd §r<lde. Totcd depth oF grc~vet betow distr'ibution pipe is 0.5' . NOTES: 1. USE 1250 GAL. SEPTIC TANK AND INSULATE IF < 4' DF COVER. 2. INSULATE TRENCHES WITH 2' HD BURIAL FOAM. 3. CONTRACTOR WILL ENSURE MINIMUM 27. SLOPE INTO SEPTIC TANK. 4. ADDITIONAL FILL WILL BE ADDED OVER SYSTEM TD ACHIEVE MIN. 3' COVER IF REQUIRED, 5. CONTRACTOR ~/ILL ENSURE ALL SEPARATIONS TO ADJACENT ;dELLS 8. SEPTICS. PREPARED FOR: LEONARD KELLY 821 N STREET SUITE 206 ANCHORAGE. AK. (907) 276-8185 FIELD BOOKS COM~UT[O: mu,o~,~. HORAN ~A~: VBG sTam.~ HORAN c.£cx~o: KMD ASSUILT: HORAN o,,,'z: 8/13/01 ov*i r,.[: c~o: NWl 764 ~ FIL~: 99091 ,DWG ,~ N~.: 99091 Stole: 1"= 100' PAGE 1 OF 2 EAGLE RIVER, AK 99577-8736 (907)696-611 I/FAX (907)696-8111 K WASTEWATER DISPOSAL THUNDERBIRD FALLS LOT 4 ,ERS SYSTEM E DETAILS AREA -·~ 3 PROPOSED DRI' PREPARED FnR: LEONARD KELLY 82! N STREET SUITE 206 ANCHORAGE, AK. (907) 276-8185 FIELD BOOKS aou.o~,w: HORAN DP. AU: VBG STAKING: HORAN c~£c~m. KMD ~sau,.T= HORAN O^T[: 8/1..3/01 O~. r,~.~': ~,0: NWl 764 *,c.~o ~: 99091.DWG ,~e .o.: 99091 Scale: 1'= PAGE 2 OF IEIfl'IB E.G,NEER,.G EAGLE RIVER, AK 99577-8736 (90?)696-8 t ~ t/FAX (907)~9~-8t t t ~D ENGINEERING 20441 PTARMIGAN BLVD. EAGLE RIVER, AK 99577-8736 SOILS PERCOLATION TEST Performed for: Leonard T. Kelley Date Performed: 4/12/00 Project: NWl/4, NWl/4, NWl/4, Sec36, T16N, R1W, SM TEST HOLE # 00-4 2--- 3- 4- 5- 6- 7- 8- Depth (Feet) Org/SM - red/brown, sandy gravel, silt w/organics, moist SP-gray, sandy MIdSM - gray, density increasing w/depth B.O.H. Bedrock SEE ATTACHED SITE PLAN FOR HOLE LOCATION Was Ground water encountered? NO Depth to water after monitoring? DRY What depth? Date? 4/19/00 NA Reading Date Gross Net Depth to Net Time Time Water Drop 1 4/12/00 3:45 7' 2 4:15 30 min 7 6/16" 10/16" 3 4:15 7 6/16" 4 4:45 30 min 6 12/16" 10/16" 10- 5 4:45 6 12/16' 11- 6 5:15 30 rain 6 2/16" 10/16" 12- 13- 14- 15- 16- 17- 18- * Water Added 1% Percolation Rate 48 (min/in) Perc Hole Diameter HOLE PRESOAKED 20- PRIOR TO TEST Test Run Between 2 feet and 3 feet I, Kenneth M. Duffus, certify that this test was performed in accordance with all State and Municipal guidelines in effect on this date. WELL /ASTE /ATER DISPOSAL SYSTEM THUNDERBIRD FALLS LOT 5 sq. Ti, DETAILS/SITE PLAN 5 85,645 sq. ft. 1.97 ocres sq. ft. 1.26 ocres 37,786 3.16 DC DESIGN DETAILS 4 BI)RM X 150 GPO = 600 GPO AREA OF FILTER = 5' x 72' = 360 gQ.FT. 600 9pd / 360 sq.?t. = 1.67 gpd/sq. Ft. 1.67 gpd/sq.?*. < 2.0 Tot(xt dept;h oF sys'l;em is 3.5' ?rom origin(~t g?c~cle. To'tc~t depth oF grc~vel be[ow clis'tribu'~ion pipe is 0.5' . NOTES: 1. USE 1250 GAL. SEPTIC TANK AND INSULATE IF < 4' OF COVER. 2, INSULATE TRENCHES WITH 2' HD BURIAL FOAM. 3. CONTRACTOR WILL ENSURE MINIMUM 2Z SLOPE INTO SEPTIC TANK. 4. ADDITIONAL FILL WILL BE ADDED OVER SYSTEM TO ACHIEVE MIN. 3' COVER IF REQUIRED. 5. CONTRACTOR WILL ENSURE ALL SEPARATIONS TD ADJACENT WELLS & SEPTICS. PREPARED FOR: LEONARD KELLY 821 N STREET SUITE 206 ANCHORAGE, AK. (907> 276-B185 Scare: 1'= 100' PAGE 1 DF 2 FIELD BOOKS CO~JT~O: '~OUNO~Y: HORAN oa^',~: VBO STAIGN~: HORAN ~¢~zo: KMD A~LT: HORAN o~: 8/15/01 ~ ?,~: ~o: NWl 764 ^c~ ri.E: 99091.DWG ~ No,: 99091 (907)696-6111/FAX (907)696-8111 K ~/ASTE~/ATER DISPOSAL THUNDERBIRD FALLS LOT 5 SYSTEM DETAILS i PROPOSED S FILTERS 0" 5 3 PREPARED FOR: LEONARD KELLY 821 N STREET SUITE 206 ANCHORAGE, AK. (907) 276-8185 FIELD BOOKS 80UNO,~*.. HORAN o~: VBG STAKI~ HORAN ~,;'c~:o: KMD ASBUiLT: HORAN o^~: 8/13/01 ~ ?mL~: ~ NWl 764 ~ ~"'¢: 99091.DWG ~ No.: 99091 Score: ~L"= 20' PAGE 2 OF 2 EAGLE RIVER, AK 99577-8736 (907)696-611 I/FAX (907)696-8111 20441 PTARMIGAN BLVD. SOILS PERCOLATION TEST Performed for: Leonard T. Kelley Date Perfo~ed: 10/10/00 Project: NWl/4, NWl/4, NWl/4, Sec36, T16N, R1W, SM TEST HOLE # 00-5 Depth (Feet) 1- 2- 3- 5- 6- 7- 8- 9- 10- 11- 12- 13- 14- 15- 16- 17- 18- 19- 20- Org SEE ATTACHED SITE PLAN FOR HOLE LOCATION GM - gray, mod. dense Was Ground water encountered? NO Depth to water after monitoring? DRY What depth? NA Date? 10/17/00 B.O.H. Bedrock Reading Date Gross Net Depth to Net Time Time Water Drop 1 10/13/00 1:30 9" - 2 2:00 30 rain 8' 1" 3 2:00 8" - 4 2:30 30 min 7" 1' 5 2:30 7" - 6 3:00 30 rain 6' 1" HOLE PRESOAKED PRIOR TO TEST * Water Added Percolation Rate 20 (min/in) Perc Hole Diameter 6' Test Run Between 1.5 feet and 2.5 feet I, Kenneth M. Duff-us, certify that this test was performed in accordance with all State and Municipal guidelines in effect on this date. NW rtG4 NO~TH MUNICIPALITY AREA REFERENCE MAP - lB 8+ 114 SEC, ~6, TI6N RIW 9 Z/lb Abb. ~ l