HomeMy WebLinkAboutUS SURVEY 3202 LT 1 T10N R1W SEC 10U SURVEY 3202 Lot 1 ION Rlw SEC ce t:,qs Lois me meAwm] MUNICIPALITY OF ANCHORAGE On -Site Water & Wastewater Program PO Box 196650 4700 Elmore Road Anchorage, Alaska 99519-6650 Phone: (907) 343-7904 Fax: (907) 343-7997 http://www.muni.org/onsite On -Site Wastewater Disposal System Permit Permit Number: OSP251068 Work Type: Septic Initial Tax Code Number: 09002223000 Site Legal Address: US SURVEY 3202 LT 1 T10N R1W SEC 10 GA760 Site Mailing Address: 362 KONIKSON RD, Indian Owner: MAYER ANN MARIE Design Engineer: CREWDSON ENGINEERING, LLC This permit is for the construction of: Effective Date: Expiration Date: Lot Size in Sq Ft: Total Bedrooms: 4/24/2025 4/24/2026 R1 Disposal Field Q Septic Tank ❑ Holding Tank ❑ Privy ❑ Private Well ❑ Water Storage All construction shall be in accordance with: 1. The attached approved design. 2. All requirements specified in Anchorage Municipal code Chapters 15.55 and 15.65 and the State of Alaska Wastewater Disposal Regulations (18AAC72) and Drinking Water Regulations (18AAC80) 3. The wastewater code requires inspections during the installation. The engineer shall notify the Development Services Department per AMC 15.65. Provide notification by calling (907) 343-7904 (24/7). 4. From October 15 to April 15, a subsurface soil absorption system under construction during freezing weather shall be either: a. Opened and Closed on the same day, or b. Covered, sealed, and heated to prevent freezing Received By: / A 7�O C �Lf SO Date: Issued By: Date: Z 2 2 MUNICIPALITY OF "J Development Services Department On -Site Water & Wastewater Section ON -SITE SEPTIC/WELL PERMIT APPLICATION Parcel I.D. 090-022-23 Property owner(s) Ann Marie Mayer Phone: 907-343-7904 Day phone 907-351-1792 Mailing address 2448 Ronny Place, Anchorage, AK 99508 Site address 352 Konikson Rd., Bird Creek Legal description US Survey 3202, Lot 1, T1 ON R1 W S 10 Number of Bedrooms 2 Engineering Firm Crewdson Engineering Building Permit Number Not Applicable RN APPLICATION IS FOR: APPLICATION IS AN: (Z all that apply) Absorption Field RX Initial RX Septic Tank RX Upgrade R Holding Tank R Renewal ❑ Privy ❑ Well ❑ THIS APPLICATION INCLUDES A WAIVER REQUEST FOR: STEP tank to well Distance: 62 1 Permit/Rush Fees: 59.5- Waiver Fees: _M/ Date of Payment: 3 L-2, 5 Zo z 5 Date of Payment: z.S— Permit No. 0C) PZ 5JOG 0 Waiver No.. 05 VZ 510 I _G7 James “Jay” Crewdson, P.E Email: CELLC.1@outlook.com Cell/Text: (907) 280‐9493 April 23, 2025 Onsite Reviewer Municipality of Anchorage On‐site Water & Wastewater Program 4700 Elmore Road Anchorage, AK 99519‐6650 Reference: US Survey 3202, Lot 1 Septic System Design Design Narrative, and 62‐foot STEP Tank to Well Separation Distance Waiver Request Design: The 2‐bedroom home is currently served by a failing undocumented septic system that is at least occasionally in shallow groundwater. The proposed design calls for it to be decommissioned in accordance with the code. Although much of the property has greater than 60 minute‐per‐inch soils and/or shallow groundwater, suitable  soils  with  excellent  percolation  and  no  groundwater  were  found  at  a  higher  location  on  the  property. Soils Log TH1 records an “SP with Silt” soil layer between 6.6‐feet and 9‐feet below ground level that  percolates  at  2.9‐mpi,  and  an  “SM”  layer  between  9‐feet  and  16‐feet  below  ground  level  that  percolates in the 6‐mpi to 15‐mpi range. The proposed Wide trench (0.5’EDx5’Wx50’L, 7’TD) is located near the toe of a 33% slope and complies with the following AMC 15.65.210 steep slope requirements: AMC 15.65.210.B4 Subsections: a: The 33% slope is within the required 25% minimum slope and 46% maximum slope, a.i: The bottom of the upgradient side of the  drainfield is 9‐feet above the bottom of the soils test hole, a.ii: The trench does not exceed 60‐inches in width, a.iii: The drainfield distribution pipe varies between 6‐feet to 6.5‐feet below the adjacent driveway surface, which has been in place for several decades and is very stable. The slope beyond the driveway, within 50‐feet down gradient of the drainfield, is vegetated with large old‐growth Sitka spruce trees. a.iv: The distribution pipe invert is 6.5‐feet below the top of the natural organic surface, a.v: The disposal field is a minimum of 100‐feet up‐gradient from any slope exceeding 46%, b and c: The percolation rate is 2.9‐mpi, so these subsections don’t apply. The drainfield is higher than the house and will require an effluent lift pump.  A camera/transmitter was used  to  locate  the  sewer  line  inside  the  house  with  the  hope  of  using  a  lift  pump  in  that  location.   Unfortunately, the sewer line was found to be about 3‐feet under the garage floor slab running parallel to a structural interior wall founded on a roughly 12‐inch‐thick thickened slab foundation.  This puts the sewer  line  about  2‐feet  vertically  lower  than  and  1‐foot  horizontally  away  from  the  bottom  of  the  structural footing.  Due to the structural complexity, risk, and danger involved removing the garage floor PO Box 671389 ● 18368 Amonson Road ● Chugiak, Alaska 99567 Municipality of Anchorage On-site Water and Wastewater REVIEWED FOR CODE COMPLIANCE OSP251068, Curtis Townsend, 04/24/25 Page 2 of 3 Date: April, 23, 2025 Subject: US Survey 3202, Lot 1 PO Box 671389 ● 18368 Amonson Road ● Chugiak, Alaska 99567 slab and digging 5‐feet to 6‐feet lower than the structural footing to install a lift station, it was decided best to use a STEP tank outside the house. Furthermore, locating the lift station in the garage puts it less than 30‐feet from the well, providing much less protection for the well and subject aquifer than the requested separation distance for the STEP tank.  In short, the proposed STEP tank to well separation is more protective of the public health and subject aquifer than installing a lift station inside the house. The proposed STEP tank will require a separation distance waiver to the well.  Although the plan is to locate the tank as far from the well as possible, an old soils test hole monitoring tube within 20‐feet of the proposed STEP tank location shows groundwater to be fluctuating between 6.5‐feet to 8.5‐feet below ground level.  The design seeks to ensure the STEP tank will not be too deep in groundwater by keeping the gravity line as short as possible, while also providing satisfactory protection for the well. 62‐foot STEP Tank to Well Waiver Request: The proposed design locates the STEP tank greater than 62‐ feet from the private onsite water well, which is on the opposite side of the house from the well.  It is lower than the well, making it nearly impossible for a sewage spill to reach the well on the ground surface. Entrance into the house both on foot or by vehicle is also between the tank and well, which will allow any sewage spills on the ground surface to be easily monitored. A well log does not appear to be available, but a recent well pump installation invoice notes the well depth is 55‐feet and the static water level is 31‐feet (see Appendix A).  Thus, the aquifer at the well’s location has approximately 10‐psi pressure [(55’‐31’) x 0.43 psi/ft] on it, indicating the aquifer is confined and very unlikely to be polluted from infiltration of onsite sewage spills and/or leaks.  A local aquifer study was completed to extrapolate the likely soil strata for the subject property and compare static water levels to determine the likelihood of the wells in this area tend to be confined of not. The findings indicate the two closest wells with complete well logs are considered confined, further justifying the likelihood that the subject well is confined too. (see Appendix A). The well water was recently tested, which “E. Coli and Total Bacteria” was found to be Negative, and “Total Nitrate/Nitrite” was found to be 0.428‐mgL.  Both values are very low, indicating the well is not influenced by either the existing failed undocumented septic system and/or the relatively shallow groundwater the existing septic system is submerged in, further demonstrating that the subject aquifer is confined and protected from onsite shallow sources of pollution.  If the subject aquifer wasn’t confined, the lab results for “E. Coli and Total Bacteria” would be much more likely be Positive, and “Total Nitrate/Nitrite” might be found to be elevated above the COSA required 5‐mgL threshold that requires additional well testing.  In short, the lab results indicate the aquifer is not under the influence of shallow groundwater and/or the existing septic system. Additionally, the HDPE plastic STEP tank is very unlikely to ever develop leaks from corrosion, and will also have a high‐water alarm system in accordance with the code.  In short, given the details of the proposed installation and the multiple mitigating factors, the requested separation distance will be protective of the public health and the subject aquifer. Page 3 of 3 Date: April, 23, 2025 Subject: US Survey 3202, Lot 1 PO Box 671389 ● 18368 Amonson Road ● Chugiak, Alaska 99567 Please feel free to contact me if you have any questions. James “Jay” Crewdson, P.E. Appendix A Existing wells near US Survey 3202 Lot 1 Notes: 1. Likely confining layers shown, but there may be other confining layers that aren't as obvious. 2. The two closest wells with complete well logs are: a. NE of the subject property: USS 3201 Lot 8: Well TD: 79, SWL: 12' b. SE of the subject property: USS 3202 Lot 6: Well TD: 100', SWL: 22' y, Mun'dpafity of Anchorage Ur�rn'tmont P.O. Box 196650 0 4700 Elmore Road Anchorage, Alaska 99519-6650 0 (907) 343-7904 0 Fax (907) 343-7997 http://www.muni.org/Onsite Deyeloj?mentServices Division On -Site Water and Wastewater Program * * * * VARIANCE/WAIVER REVIEW * * * * Waiver#: OSV251015 COSA#: PID#: 090-022-23 Permit#: OSP251068 Legal Description: US SURVEY 3202 LT 1 T10N R1W SEC 10 Engineer: �� E- 1-,- 0 S �/,j Your request for a waiver of the required 100 feet horizontal separation from the S.T.E.P. tank to the private well has been approved. The approved separation distance is 62.0 feet. This waiver approval applies to the proposed S.T.E.P. tank only. Any future upgrade to the on - site wastewater disposal system will require all separation distances be met or another approval from this department. Waiver is Granted: X Waiver is not Granted: T_ Date: 7 Z S7 Approved by: Name of Reviewer .............................................................................. **** VARIAN C EMAIVE R REVIEW **** Municipality of Anchorage On-site Water and Wastewater REVIEWED FOR CODE COMPLIANCE OSP251068, Curtis Townsend, 04/24/25 Municipality of Anchorage On -site Water and wastewater REVIEWED FOR CODE COMPLIANCE Performed For: Legal Description TH1 Municipality of Anchorage Development Services Department On -Site Water and Wastewater Section 4700 Elmore St. P.O. Box 196650 Anchorage, AK 99519-6650 www.muni.org/onsite (907)343-7904 Soils Log - Percolation Test .51't2RS�1 8 CUVST, a J rnes A. Crewdson Gf C11527r�' Anne Marie Mayer Date Performed: 10-18-2024 US Survey 3202, Lot 1 Township, Range, Section: Slope Site Plan with Silt MI. bee Design Drawing WAS GROUND WATER ENCOUNTERED? NO s IF YES, AT WHAT DEPTH? L Depth to Water After 0 P Monitoring? Dry E Date: 10-25-24 n Drawing See Design Drawing Reading Date Gross Time Net Time Depth to Water Net Drop 10-18-24 minutes inches 10 3 9/16 10 3 8/16 10 3 8/16 10 3 7/16 10 13 7/16 10 1 3 7/16 PERCOLATION RATE L,y (minutesNnch) PERC HOLE DIAMETER 6" TEST RUN BETWEEN _7 FT AND 8 FT COMMENTS SM soils perc in the 6-15mpi range PERFORMED BY: Crewdson Engineering LLC I James Crewdson CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 10-18-2024 04/24/2 Received Date/Time 03/07/2025 16:32 03/07/2025 15:30Collected Date/Time 1250853001 Matrix SGS Ref.# Client Sample ID Outside Spigot Client Name Project Name/# Printed Date/Time 03/12/2025 12:07Residential Testing - Cash Account Technical Director Stephen C. Ede 362 Konikson Rd, Bird Creek AK Drinking Water Sample Remarks: Parameter Results LOQ Units Method Allowable Limits Prep Date Analysis Date InitContainer ID Microbiology Laboratory M.A03/07/25SM21 9223B100mLE. Coli Negative 1 A M.A03/07/25SM21 9223B100mLTotal Coliform Negative 1 A 2 of 52 of 5 Revised Report-Revision 1 Received Date/Time 04/01/2025 10:14 04/01/2025 9:30Collected Date/Time 1251174001 Matrix SGS Ref.# Client Sample ID Outside Hosebib Client Name Project Name/# Printed Date/Time 04/14/2025 16:02Crewdson Engineering LLC Technical Director Stephen C. Ede 362 Konikson Rd. Drinking Water Sample Remarks: Parameter Results LOQ Units Method Allowable Limits Prep Date Analysis Date InitContainer ID Waters Department MCP04/07/25SM21 4500NO3-Fmg/LTotal Nitrate/Nitrite-N 0.428 0.200 (<10) A 2 of 5 UNSUBDIVIDED z ILL _ � N U] m W Cj O Q�� M z w �ZI m O w J O O LO 0 O ,;I- 129 REBAR W/CAP CW WELL DECK 24.0' 2-STORY W FRAME HOUSE 24.0' N 49020'00" W 330.00' 50' RIGHT-OF-WAY EASEMENT (PATENT No. 1192992) -------rn-------------- 1-STORY 11.2 FRAME CABIN I BUILDING DETAIL 1" = 20' LOT 1 SHED 2.50 ACRES O SEE BUILDING DETAIL zo m S 49020'00" E 330.00' LOT 6 THIS MORTGAGE LOCATION SURVEY SHOULD ONLY BE USED FOR A SINGLE PROPERTY TRANSACTION. RE -USE OF THIS DRAWING BY THE ORIGINAL CLIENT OR BY OTHERS, FOR ADDITIONAL USES AT A LATER DATE WITHOUT EXPRESS CONSENT OF THE SURVEYOR IS A VIOLATION OF FEDERAL COPYRIGHT LAW. UNLESS GROSS NEGLIGENCE IS DISCOVERED, THE LIABILITY EXTENT OF THE PREPARER SHALL BE LIMITED TO THE AMOUNT OF FEES COLLECTED FOR SERVICES IN PREPARATION OF THIS PRODUCT. EASEMENTS OF RECORD, OTHER THAN THOSE SHOWN ON THE RECORDED SUBDIVISION PLATARE NOT SHOWN HEREON, UNLESS OTHERWISE NOTED. THIS DOCUMENT DOES NOT CONSTITUTE A BOUNDARY SURVEY AND IS SUBJECT TO ANY INACCURACIES THATA SUBSEQUENT BOUNDARY SURVEY MAY DISCLOSE. UNDER NO CIRCUMSTANCES SHOULD ANY OF THE DATA HEREON BE USED FOR CONSTRUCTION OF FENCES, IMPROVEMENTS, OR FOR ESTABLISHING PROPERTY BOUNDARIES. THIS SURVEY REPRESENTS A MORTGAGE LOCATION SURVEY PREPARED IN ACCORDANCE WITH THE ASPLS MORTGAGE LOCATION SURVEY STANDARDS. 0 25' 50' O O 0 H- cM z w CM W rn LIJ N U) N W m - H 0 z w OZ O FL w Ilt 0a Z wv 0 L *: 49 TH * ; ......... ...................� D�/09/23 �'. B u Sahz : �o LS-14837 AS -BUILT I HEREBY CERTIFY THAT I HAVE SURVEYED THE FOLLOWING DESCRIBED PROPERTY: LOT 1, U.S. SURVEY No. 3202 ANCHORAGE RECORDING DISTRICT, ALASKAAND THAT THE VISIBLE IMPROVEMENTS SITUATED THEREON ARE WITHIN THE PROPERTY LINES AND NO VISIBLE ENCROACHMENTS EXIST EXCEPTAS INDICATED. DATED THIS 7th DAY OF JULY, 2023, ATANCHORAGE, ALASKA. FIXED HEIGHT, LLC C.O.A.122554 Land Surveying Services 907.290.8949 225 W 23rd Ave., Anchorage, AK 99503 WWW.FIXEDHEIGHTCOM JOB # 23092 I NO CORNERS SET THIS DATE I SCALE 1" = 50'