HomeMy WebLinkAboutCHEROKEE RIDGE S12086Onsite File NEW= October 3, 2014 Municipality of Anchorage Building Safety Division On Site Water and Wastewater Program 4700 Elmore Street Anchorage, AK 99507 Attention: Debbie Wockenfuss Subject: Cherokee Ridge Subdivision S-12086 Septic System Feasibility Study Dear Debbie: We recently reviewed the proposed plat for Cherokee Ridge Subdivision with the intent of completing a subsurface soils study to identify areas suitable for the construction of on site septic system to dispose of septic effluent to be generated from the houses proposed for construction on the newly created lots. Cherokee Ridge Subdivision is located west of Elmore Road approximately 300' north of Klatt Road. The parcel will be divided into 4 individual lots with the surface area ranging from 43,520 square feet to 57,248 square feet. The ground surface of the lots slopes from the east to the west at a grade approximating 5% to 10%. 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 April and May of 2014. Soil assessment and percolation testing continued during that period. Water monitoring has been ongoing with readings last taken on October 3, 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 every case gravel with sand (GM) with varying degrees of silt and silty sand with gravel (SM) was encountered full depth in each hole. The percolation rate was 11.9 to 22.9 minutes per inch. Cherokee Ridge Subdivision S-12086 October.3, 2014 Page 2 All work was completed under the direction of technicians and engineers at Pannone Engineering Services, LLC. 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 12,000 to 14,000 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, 4j --.4,e G W� Michael E. Anderson, P.E. Attachments 0 49th .A ;MICHAEL E. ANDERSON .; G� 4 i J' NO. CE -4381 Zi NOTE: The Well on Lot 83 is >300' West of Proposed Property Line. The Septic System is >200' West of the Proposed Property Line. v e� 01� 'ale eY � I 49th ` ..:....... .....:... .P r MICHAEL E. ANDERSON 4 No, CE -4381 I WF'I I AWn 1:7,17PTIr �Y-�TFKA PI ®i�r--___---- SCALE 1 " = 100' LEGEND ® Test Hole Designation and Location ® Well Location with 100' Protective Radius Contour Interval — 2' ANDERSON ENGINEERING 800 E. DIMOND BLVD. SUITE 3-310 ANCHORAGE, AK 99515 an -7_S)) --7-7-7z CHEROKEE RIDGE SUBDIVISION LOTS 1 THRU 4 S - 12086 GRID: SW2637 SCALE: 1"=100' DATE: 10/14/2014 ZONING: R6 DRAWN: MEA FILE NO.: CRWSEP CHECKED BY: MEA CASE NO.: S12086 1 � 2 3- 4- 5 — 6- 7- 8 — 9.- 10 — 11 — 12 — 13 — 14 — 15 — 16 — 17 — 18 — TEST HOLE 1 OR I ORGANICS GM TIGHT SILTY GRAVEL GRADUAL SOIL INTERFACE GM/SM SILTY SAND AND GRAVEL BOH SOILS LOG - PERCOLATION TEST .HN I l' —�J L-- ��---- ---- {—�-- a�� I — 4` �• _ 1 _ 2 WAS GROUND WATER ENCOUNTERED? Y IF YES, AT WHAT DEPTH? NONE' DEPTH TO WATER AFTER MONITORING? NONE' DATE: 4/21/2014 DATE PERFORMED: 4/14/14S/1 5/(-/ n o n 101-31 y tion e .paf I7�f3 Ct9I'7Gv 1 SLOPE �\ 4 SLOPE TH X READING DATE CLOCK NET TIME WATERTIME LEVEL READING NETDROP 1 4/14/14 12:36 --- 5.57 -- 2 1:06 30 MIN 8.34 2.77 3 1:08 1 -- 5.42 --- 4 1:38 30 MIN 7.90 2.48 5 1:41 -- 5.42 -- 6 2:11 30 MIN 7.81 2.39 PEROLATION RATE 12.6 (min/inch) PERC HOLE DIAMETER 6 inches TEST RUN BETWEEN 5.5 FT AND 6.5 FT COMMENTS: Test hole excavated by Brian T. Harten. Prec hole was presoaked. Perc test ran for at least 1.5 hours. Last three readings reported. Bottom of perc hole in GM/SM. Test performed in representative soil. PERFORMED BY: Steven R. Pannone, P.E. I CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE -WITH ALL STATE AND MUNICIPAL GUIDLINES IN EFFECT ON THE DATE OF THIS TEST. NOTES: �������\� Date PANNONE ENG SVC,. LLC — of a� 1>, SOILS LOG P.O. BOX 102954 ANCHORAGE, AK 99510'C� • " " • • qS y 5/27/2014 Scale PHONE (907) 272-8218 FAX (907) 272-8211 * .4 �NTS .......... .. P.I.D. NO T12N R3W, SEC 21 N2SE4SE4NE4 s-272-222 BRIAN T. HARTEN Steven 'R. Pannone PERMIT N0. ELMORE % �� CE ai 49 �i x SOILS LOG n - ANCHORAGE, AK 99516 ,� T �Fpb©. • . ` �'-� sheet PRO FES```+ 2 OF 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 TEST HOLE 2 OR I ORGANICS TIGHT SILTY GM GRAVEL GRADUAL SOIL INTERFACE GM/ SILTY SANDS SM AND GRAVELS SOILS LOG TEST HOLE 2 - PERCOLATION TEST SLOPE SITE dL4N X j" _ - _ TH WAS GROUND WATER ENCOUNTERED? N IF YES, AT WHAT DEPTH? NONE' DEPTH TO WATER AFTER BOH MONITORING? NONE' DATE: 4/21/2014 DATE PERFORMED: 4/14/14 Non e, 5//5// y Non /0/yli y pa, r�EA CD raw) SLOPE TH X READING DATE CLOCK NETTIME WATERTIME LEVEL READING NET DROP 1 4/14/14 1:48 -- 5.92 -- 2 2:18 30 MIN 9.94 4.02 3 2:18 -- 5.92 -- 4 2:48 30 MIN 8.77 2.85 5 2:48 -- 5.92 -- 6 3:18 30 MIN 8.87 . 2.9.5 PEROLATION RATE 10.2 (min/inch) PERC HOLE DIAMETER 6 inches TEST RUN BETWEEN 4.5 FT AND 5.5 FT COMMENTS: Test hole excavated by Brian T. Harten. Prec hole was presoaked. Perc test ran for at least 1.5 hours. Last three readings reported. Bottom of perc hole in GM/SM. Test performed in representative soil. PERFORMED BY: Steven R. Pannone, P.E. I CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDt WITH ALL STATE AND MUNICIPAL GUIDLINES IN EFFECT ON THE DATE OF THIS TEST. NOTES: PANNONE ENG SVC, LLC P.O. BOX 100217 ANCHORAGE, AK 99510 PHONE (907) 272-8218 FAX (907) 272-8211 - of A� �l ? gsl�1 P %�ij�'�.--v j*:49TH*�� ... ...... .. ...... � / Steven R. Pannone �,llF/��"'F����—' ll�� OfES`>���+ Dote 5/27/2014 SOILS LOG Scale NTS T12N RX SEC 21 N2SE4SE4NE4 HARTEN BRIANT.� ELMORE ANCHORAGE, AK 99516 P.I.D. NO 015-272-222 PERMIT IT NO. SOILS LOG Sheet 3 OF 5 SOILS LOG - PERCOLATION TEST TEST HOLE 3 SLOPE `.� — 'SJTF-PLAN OR 1 ORGANICS 2 GW/SM TIGHT SILTY 3 SAND GRAVEL 4 SOIL INTERFACE 5 B X t TH $�- /.iu coy k 9 GM/SM SILTY SAND 10 AND GRAVEL COO 12 i 4 13 WAS GROUND WATER SLOPE 14 ENCOUNTERED? NO 15 IF YES, AT WHAT TH 16 DEPTH? NONE' X 17 BOH DEPTH TO WATER AFTER MONITORING? NONE' 18 DATE: 2014 DATE PERFORMED: 5/20/14 N on G 5�5� y Per MaGA (O M&9 PEROLATION RATE 22.9 (min/inch) PERC HOLE DIAMETER 6 inches TEST RUN BETWEEN 5.0 FT AND 6.0 FT COMMENTS: Test hole excavated by Brian T. Harten. Prec hole was presoaked. Perc test ran for at least 1.5 hours. Last three readings reported. Bottom of perc hole in GM/SM. Test performed in representative soil. PERFORMED BY: Steven R. Pannone, P.E. I CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDLINES IN EFFECT ON THE DATE OF THIS TEST. NOTES: PANNONE ENG SVC, LLC =`OF AL q Date SOILS LOG P.O. BOX 102954 ANCHORAGE, AK 99510 i 'C� ' ' ' ' ' qs 5/27/2014 PHONE (907) 272-8218 FAX (907) 272-8211 %Cp�P �y�+ Scale *. .. ... .*.�� P.I.D.NTS T12N R3W, SEC 21 N2SE4SE4NE4 "Steven R. 'Pannone j PERM T NO. BRIAELMORERTEN� . C/E�8 4 �/ X �irT G l�j(l �� r SOILS LOG ANCHORAGE, AK 99516 ,` F�Fp p�^� Sheet 11 PROFESSION 4 OF 5 READING DATE CLOCK TIME NET TIME WATER LEVEL READING NET DROP ' 1 5/21/2014 8:09 -- 4.73 --- 2 8:39 30 MIN 6.00 1.27 3 8:41 -- 3.33 --- a 9:11 30 MIN 4.94 1.61 a 9:12 --- 3.76 -- s 9:42 30 MIN 5.07 1.31 SOILS LOG - PERCOLATION TEST TEST HOLE 4 SLOPE SITE N 1 OR ORGANICS N S-11 2 _j 3 TIGHT SILTY GRAVEL 4— GM 5 6 GRADUAL SOIL x INTERFACE TH 7 8 (DI J, 10 GM/ SILTY SANDS 11 — SIM AND GRAVELS 4 I b1 12 — 13 WAS GROUND WATER SLOPE 14 ENCOUNTERED? N 15 IF YES, AT WHAT TH DEPTH? NONE' x 16 17 DEPTH TO WATER AFTER BOH MONITORING? NONE' 18 DATE: 4/21/2014 CLOCK n'�- 511! � Irl READING DATE TIME DATE PERFORMED: 4/14114 WATER NET TIME LEVEL NET DROP O/q// 1 4/14/14 11:55 READING --- 4.52 — 2 12:25 30 MIN 7.61 3.09 Pe 3 12:26 4.55 -- (.Dmp)) 4 12:56 30 MIN 7.33 2.78 5 12:59 -- 5.92 --- 6 1:29 30 MIN 7.41 2.51 PEROLATION RATE. 11.9 (min/inch) PERC HOLE DIAMETER 6 inches TEST RUN BETWEEN 5.5 FT AND 6.5 FT COMMENTS: Test hole excavated by Brian T. Harten. Prec hole was presoaked. Perc test ran for at least 1.5 hours. Last three readings reported. Bottom of perc hole, in GM/SM. Test performed in representative soil. PERFORMED BY: Steven R. Pannone, P.E. I CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDLINES IN EFFECT ON THE DATE OF THIS TEST. NOTES: PAMONE ENG SVC, LLC N Date 5/27/2014 SOILS LOG P.O. BOX 100217 ANCHORAGE, AK 99510 ........ 1�y Scale PHONE (907) 272-8218 FAX (907) 272-8211 q) J111" *.- 4 NTS ...... . .. P.I.D. NO T12N R3W, SEC 21 N2SE4SE4NE4 015-272-222 BRIAN T. HARTEN ...................... Steven R. Pannone — PERMIT PERMIT NO. ELMORE -P, * CE 814 Sheet 5 OF 5 SOILS LOG ANCHORAGE, AK 99516 October 14, 2014 Municipality of Anchorage Building Safety Division On Site Water and Wastewater Program 4700 Elmore Street Anchorage, AK 99507 Attention: Debbie Wockenfuss Subject: Cherokee Ridge Subdivision, S-12086 Water Availability Study Dear Debbie: We have collected information on several wells in the area of the proposed Cherokee Ridge Subdivision to estimate the possible depths and production rates of wells to be constructed in the future on Lots 1 through 4. Field and file investigations indicate a combination of wells constructed without the presence of bedrock to depths ranging from 165' to 278' with a median depth approximating 240'. The wells immediately north of Cherokee Ridge in Spielman Subdivision range in depth from 171' to 238' with production rates of 8 gallons per minute on Lot 1 and 14 gallons per minute on Lot 2 according to their respective well logs. The well on Lot 1 was tested in 1990 and found to produce 5 gallons per minute according to the four hour flow test. Both wells in Spielman Subdivision have casing the entire depth of the well. Static water levels were found at 171' on Lot 1 and 228' on Lot 2. The wells immediately south of Cherokee Ridge in Siefker Subdivision No. 2, Blocks 4 and 5 range in depth from 165' to 278' with casing the entire depth of all wells. The production rates range from 15 gallons per minute on Lot 3 to 100 gallons per minute on Lot 3 of Block 4. A flow test was performed on the well on Lot 4, Block 4 with a result of 6.7 gallons per minute. In all cases the wells studied produced in excess of 5 gallons per minute according to well logs or flow tests performed to date. A well is located west of Cherokee Ridge, but more than 400' away. No information could be found regarding the construction or production of this well. Cherokee Ridge Subdivision October 14, 2014 Page 2 CHEROKEE RIDGE SUBDIVISION WATER AVAILABILITY STUDY LEGAL DESCRIPTION WELL DEPTH PRODUCTION - LOG PRODUCTION - TEST Spielman, Lot 1 171' 8.0 GPM 5.0 GPM Spielman, Lot 2 238' 14.0 GPM Siefker #2, Block 5, Lot 4 266' 6.0 GPM Siefker #2, Block 5, Lot 3 278' 15.0 GPM Siefker #2, Block 5, Lot 1 165' Unknown Siefker #2, Block 4, Lot 1 235' 12-15 GPM 6.7 GPM Siefker #2, Block 4, Lot 3 241' 100 GPM It is obvious from our study that any wells to be constructed in Cherokee Ridge Subdivision in the future will be placed to depths approximating 240' and will probably require casing the entire depth. The static water level in the wells will approach 200' to 220' below the surface. The aquifer serving the area will provide sufficient water to support an additional four five bedroom homes as proposed for Cherokee Ridge Subdivision. The production rate of the individual wells is expected to be between 4 and 6 gallons per minute. Our research also indicates the wells should function without hindering the performance or production of the surrounding wells. Sincerely, Michael E. Anderson, P.E. Attachments OF A 00 ost �oaooe800.ees..$Y"a�ie000eooa•en•`o b ®�, oMICHAEL E. ANDERSON o 6 cs CE - 4381 Lot 1_ — -----_ - Q _ O ---� We111ting I el I w ® •� 4 0 \ Lot 6 I iSeptic� Production 71,8 GPM I ��/ Lot 2 ; Existing \ I Area i \ Tested 1990 - 5 GPM , _ I \ I L ---J `,Static - 150' 1 i ; Depth - 238'- ---) �w Production - 14 GPM I i SAretc Statig' - 198' 1 c I S89'�8=1�"W 611.49'(R1)__---- ___t�18T58' 8"E 610.73'(M)So.o'/� so.o --------,------ 320.33:'' 589'.58'38-W 290.40 j Proposed i w Lot 2 Wel( Lot 1 „o,', 43,560 sq. ft. o; kn I Proposed o , � 57,246 sq. ft. W®It E) .� /^ o i ` 0-N O 1 al�l� ---- N_ ------------------------------ N89'58'38"E 290.40' o oM o 0 rj S89'58'2\8"W 610.47"' ,' 15' Access Esmt for Lot 1 M-0 e'� �� • Ll,� �•1 �rf(i`�t � Hyl � 15' Access Esmt for Lot 4 S8'8'19W 290.40rO 030 a io --------�---------------------�O•Ve� O OOa)OOO zai O� Z z ® ED Z I LO ILot 4 , Proposed�, Nrelposed i Lot 3 0 57,203 sq. ft. Well b ; 0 o ; 43,560 sq. ft. \\ \ o , / -----------319.81' 290.40' �0.0' 1 0.0' 3 f — — I ical I I S89'58'31"W 616.57'(R) Existing I r-_-----_-1 Septic Well I ---Area- - I I SeptiAteac Depth - E) I 1 I I L--- I Production - 6 GPM ( i ry 'Uj ��e� �O • --- I '' Lot 1 \`,I I L-- \ static -223' I ; I Lot 4. I o) 000 Lot 3 Lot 4 \`�' ExistingI // I -J Well Lot 2 1-----------= Depth - 241' I I Depth® 165' I UNDEVELOPED ,110 Production - 100 GPM i ---_ Static - 121' i 1 Existing ilII i ; �1� - N.1 Lot 3 3 I Depth - 235' ,Production - 12-15 GPM Tested 1980 - 6.7 GPM i I e� ,Static - 168' eExisting W i�ting oZl00 ED � OF ®®®®®P�� ®11®® I ---- Production 78' 15 GPM Static 230' ; ............49th ...................... .................................. �n MICHAEL E. ANDERSON ►®-;,i% No. CE -4381 ®® ®®40 pROFESSI WATER AVAILABILITY PLAN ------ SCALE 1 " = 100' LEGEND �� ® Test Hole Designation and Location ® Well Location with 100' Protective Radius Contour Interval - 2' ANDERSON ENGINEERING 800 E. DIMOND BLVD. SUITE 3-310 ANCHORAGE, AK 99515 907-522-7773 CHEROKEE RIDGE SUBDIVISION LOTS 1 TH R U 4 S - 12086 RID: SW2637 SCALE: 1 "=100' DATE: 10/1.4/2014 ZONING: R6 RAWN: MEA FILE NO.: CRWSEP CHECKED BY: MEA CASE NO.: S12086