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HomeMy WebLinkAboutLANDES LANDING ADDN #1 S12493Onsite File JIM Landes L artuin LANDES LANDING ADDITON #1 LOTS 2C,3,4 Soils Report Engineer's Soils Report LANDES LANDING ADD#1 LOTS 2C,3,4 Municipality of Anchorage Prepared for: Beverley Landes Declaration of trust PO Box 1552 Soldotna, AK 99669 Prepared By: Pannone Engineering Services, LLC P.O. Box 100217 Anchorage, AK 99510 Submitted By: Steven R. Pannone, P.E. Principal, Civil Engineer 10/31/2019 ?—P—V i2.1-a31t-f LANDES LANDING ADDITON #1 LOTS 2C,3,4 Soils Report Engineering Report Project Description This soils report is to identify the suitability of the soils on the lot for an on-site septic system. The subject lots are the proposed subdivision of Landes Landing Subdivision Lots 2C,3,4. This report will detail the soils encountered during the soils investigation, existing topography, impact to surrounding wells and septic system and the suitability of the soils encountered for the use of an on-site wastewater disposal system and water supply system. The lots range from approximately 2.1 acres to 1.5 acres in size. Lot 4 is undeveloped while lot 2C and lot 3 are developed. Soils Investigation Pannone Engineering Services performed a soils investigation on August 14, 2019 throughout the subdivision. The test pits were excavated by Dean's Construction and were excavated to the maximum extent of the excavator or until refusal. The test pits revealed a variety of soils as shown on the attached Soils Logs for each of the proposed subdivision lots. Ground water monitoring was conducted over a seven-day period. Topography The lot is characterized sloping terrain. In general, the entire property starts sloping down from the southern property line to the northeast property corner of Lot 3 and northwest property corner of Lot 2C (see attached subdivision site plan). There are areas that have elevation changes which result in grades over 25%. There are no slopes greater than 46% within the designated reserve areas. All drain fields installed within fifty (50') of a slope exceeding 25% shall conform to the steep slope provision of AMC 15. 65.. Existing water and wastewater systems Lots 2C and 3 are developed. The existing water supply systems are private wells and have a 100 -foot protective radius around them (i.e. a new wastewater disposal system may not be located less than 100 feet from these private water wells.) The documented wells are far enough back on the lot that their protective well radiuses do not affect the proposed subdivision lots. Surface water There are no major bodies of surface water within 200 feet of the proposed septic area. There are ephemeral drainage ditches along the existing road and in other areas of the property. Engineering Criteria The soils in this area are typically Hydrologic Soils Group A which contains organics generally underlain by gravel and sand. PES conducted two percolation tests on the proposed lots and found a percolation rate between 1-5 MPI. The soil composition and percolation rate confirms the soil classification of HSG A. Seven day water monitoring was performed on all test holes. Based upon the soil test results there are several options for systems that could be installed on all the lots. There are no steep areas within the respective reserve areas. LANDES LANDING ADDITON #1 LOTS 2C,3,4 Soils Report The table below has the test hole depths, percolation rates and depth to ground water on each perspective lot in the subdivision. LOT TH it TH DEPTH PERC RATE OCTOBER GROUND WATER READINGS REQUIRED RES AREA 3 2 16 1.67 DRY 10000.0 4 1 16.5 2.03 14.50 10000.0 2C 16 3.5 DRY 1 18 15 DRY Landes Landing 257' 15gpm 143 L2A Site Information The Municipality of Anchorage (Moa) Regulations (15.65) govern for single-family homes. These regulations require a minimum of four (4) feet vertical separation between the bottom of a soil absorption system and ground water for a conventional wastewater disposal system, six feet (6') to bedrock or other impermeable layers (tight silts and clays) and must be located greater than 100 feet horizontally from any surface water (Creeks and ponds). Additionally, the accepting soils must have a percolation rate of less than 120 minutes per inch. A lot must have room for a primary and reserve soil absorption systern. Water Availability There is availability for a private water system on the lot. A survey of the well data from the surrounding lots is provided On the table below. Data shows ample water availability in the lots surrounding the above referenced lots. Legal Description Well Depth Well Production Static Water Level Landes Landing 206' 10gpm 173' Add#1 Lot 3 Landes Landing 250' 25gpm 138' Add#1 Lot 2C Landes Landing 257' 15gpm 143 L2A LANDES LANDING ADDITON #1 LOTS 2C,3,4 Soils Report Nitrate Analysis Below is a table of the documented lots surrounding the proposed subdivision and their respective nitrate levels. Legal Description Years Sampled Results (mg/L) Landes Landing Lot 1 2019 ND Landes Landing Lot 2A 2012 ND Landes Landing Lot 28 2014 ND Great Dane Lot 4 2016 0.10 2014 ND 2000 0.50 1993 0.10 Great Dane Lot 3 2004 0.10 1998 0.10 1996 0.10 1994 0.16 Elsner Park Lot 2 1997 0.11 1992 0.34 1988 0.16 1987 0.24 tO] Cos Fi�sml Bk 488 Pg 59:m \ I 1 I,+ - _ T• `. _ , � ,'/ SII � ,� I , ! � i ISI ♦��•e�..� Il1Jt \t , ! 1 � ice. o !l - �r ! 1 ! I 10_€%ck, iele�am jEsm_\ o F +V" ly t \ ^/ o ' t I ♦ \ btI17t , I r ur , O r l ''j�am� •-------- 0 — _ _ _ ♦♦m ♦V t, t,�'// / 1 \ x O Z C t I 1 1 O Z21 / 13 I I / R,, !n �\ IWt �vt ♦ a� I t y O c: n I i I I { I = I—_ �- ,z � SII NOTES: PANNONE ENG SVC, LLC��\\\� REVISIONS DATE FOR MOA REVIEW ONLY PHONE 9070 745-8200 1807 PALMER FAX 9079745-8201 i,P� �FA�gS'�1�� REV 1: 12/23/19 SCA645 E/12/19 k; is 1" = 100' LANDES LANDING ADD#1 LOTS 2C,3,4 / P.I.D. NO DRAWN ACP BEVERLY LANDES DECLARATION OF TR $Lev anrione / xxx-xxx-xx 811 -PERMIT SITE PLAN SITE:03500 01MALLE©LROADAA CHORAGE,AK r+! 1411"i *P9p?a-,,"'� SHEET O 0.3 9 10 11 12 13 SOILS LOG - PERCOLATION TEST SLOPE — _ ` — \ ,PEA;r -rte � I I 355 S I \ LOT 4 IL ` �f LL 1 10,000 SO. FT. \ I � 1 RESERVE AREA - _ - 1 1\ `` 370 375 X - �� I 380 TH —�1.8 _ � -� --�� -w WAS WAS GROUND WATER ENCOUNTERED? N IF YES, AT WHAT DEPTH? N/A DEPTH TO WATER AFTER MONITORING? 14.50' DATE: 10/18/2019 DATE PERFORMED: 8/14/2019 COMMENTS: Test hole excavated Deans Construction. SLOPE TH x READING DATE TEST HOLE 1 TOPSOIL WATER LEVEL READING OR 1 9:55 --- 3.00 2 SM SILTY 9 MIN 8.02 SAND 3 10:05 --- 3.00 4- 4 10:15 56 5- 7.94 4.94 6 10:16 --- 3.00 GM 6 7 10 MIN 7.92 4.92 SAND & 8 GRAVEL 9 10 11 12 13 SOILS LOG - PERCOLATION TEST SLOPE — _ ` — \ ,PEA;r -rte � I I 355 S I \ LOT 4 IL ` �f LL 1 10,000 SO. FT. \ I � 1 RESERVE AREA - _ - 1 1\ `` 370 375 X - �� I 380 TH —�1.8 _ � -� --�� -w WAS WAS GROUND WATER ENCOUNTERED? N IF YES, AT WHAT DEPTH? N/A DEPTH TO WATER AFTER MONITORING? 14.50' DATE: 10/18/2019 DATE PERFORMED: 8/14/2019 COMMENTS: Test hole excavated Deans Construction. SLOPE TH x READING DATE CLOCK TIME NET TIME WATER LEVEL READING NET DROP 1 8/14/2019 1 9:55 --- 3.00 --- z 1 10:04 9 MIN 8.02 5.02 3 10:05 --- 3.00 --- 4 10:15 10 MIN 7.94 4.94 5 10:16 --- 3.00 --_ 6 10:26 10 MIN 7.92 4.92 SOIL TEST RESULTS /ANALYSIS • PERCOLATION RATE 2.03(min/inch) • PERC HOLE DIAMETER 6" • TEST RUN BETWEEN 4.0 FT AND 5.0 FT. • TEST RUN FOR OVER AN HOUR, LAST THREE READINGS PROVIDED. PERFORMED BY: Aaron Paradis. I CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDLINES IN EFFECT ON THE DATE OF THIS TEST. NOTES: PANNGNE ENG SVC, LLC���oF P.O. BOX 102954 ANCHORAGE, AK 99510 PHONE (907) 272-8218 FAX (907) 272-8211 q� �� 'C� �9�,1�� co T y � ® ..... ... / / Steve'n •R: •Ponnbme'/ ;w rr�Fc� CE 8149 p1llF�Faoss�oNA`'� '��e Dote 12/12/19 ScaNTS LANDES LANDING ADD#1 LOTS 2C,3,4 BEVERLY LANDES DECLARATION OF TRUST PO BOX 1552 SOLDOTNA, AK 99669 SITE: 3500 O'MALLEY ROAD ANCHORAGE,AK P.I.D. NO xxx-XxX-xx DRAWN BY: ACP PERMIT N0.r�O SOILS LOG sheet 2 OF 3 TEST HOLE 2 TOPSOIL/ 1 OR SILTY SAN 2 3 GM I SILTY GRAVEL 4 5 11 7 GM/ 5M SANDY 8 GRAVEL 9 10 11 12 13 14 15 16 17 SOILS LOG — PERCOLATION TEST SLOPE i SLIt PLAN' '! r r�SEPTICd AREA I i DRIV � i ewaY r '�ml SFD I � LOT 3 �` I I N1, TH \ / -I WAS GROUND WATER SLOPE ENCOUNTERED? N IF YES, AT WHAT DEPTH? N/A DEPTH TO WATER AFTER MONITORING? DRY DATE: 10/18/2019 DATE PERFORMED: 8/14/2019 COMMENTS: Test hole excavated Deans Construction. TH x READING DATE CLOCK NET TIME WATERTIME LEVEL READING NET DROP I 7/i4/20`1.11:20 --- 3.00 --- 2 11:27 7 MIN 9.00 6" 3 11:28 --- 3.00 --- 4 11:38 10 MIN 9.00 6" 5 11:39 --- 3.00 --- 6 11:49 10 MIN 8.99 5.99 SOIL TEST RESULTS /ANALYSIS • PERCOLATION RATE 1.67(min/inch) • PERC HOLE DIAMETER 6" • TEST RUN BETWEEN 4.0 FT AND 5.0 FT. • TEST RUN FOR OVER AN HOUR, LAST THREE READINGS PROVIDED. PERFORMED BY: Aaron Paradis. 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 ��1oF A���t Date P.O. BOX 102954 ANCHORAGE, AK 99510 ��• 4sll� 12/12/19 PHONE (907) 272-8218 FAX (907) 272-82114 �y��P Scole NO LANDES LANDING ADD#1 LOTS 2C,3,4 e xxx-ELD. x - DRAWN BY: ACP • • xxx-xxx-xx BEVERLY LANDES DECLARATION OF TRUST F, Sie'ven 'R: Pannone / 0 PERMIT N0. PO BOX 1552 SOLDOTNA, AK 99669 ��F�� CE 8149 ��/ SOILS LOG ITE: 3500 O'MALLEY ROAD ANCHORAGE,AK ��liFpOFESSIO�P����� Sheet 3 OF 3