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Home My WebLink AboutDAVIDSON Lots 1 & 2\ 4,0 r Q 1 Alaska Testlab 4040 "B" Street Anchorage, Alaska 99503 Phone (907) 278-1SSt ( Telecopier (907) 272-5742 ) October 27, 1982 W.O. #A20946 Grid: 2324 Dan Davidson 8747 Endicott Street Anchorage, Alaska 99502 Re: Lots 1 and 2, Davidson Subdivision Well Separation Dear Mr. Davidson: We have reviewed the proposed development as shown on Figure 1 and have also reviewed our soil report of April 5, 1979, for the purpose of determining well and septic system separa- tion. We understood that the proposed development will - „consist of placing a duplex on Lot 1:' The soils from 2 to 13 feet are gravel and have a high percolation rate which is confirmed by both the percolation test and the visual soil classification. The M -W well log also indicates a highly permeable upper layer of sand and gravel which is underlain by an adhesive silty sand from a depth of 90 to 245 feet. The water bearing strata lies below a depth of 245 feet. Topography of the general area slopes steeply to the west although the lots are relatively level. The attached drawing indicates that the existing waste water drain field lies over 100 feet, but less than 150 feet, from the existing well. We recommend that the newly constructed waste water drain field be placed at least 150 feet from the existing well. The existing well may be used to supply both structures on Lots 1 and 2. The possibility of infiltration of waste water into the aquafer is remote due to the high percolation rate of shallow soils, topography, and soil stratigraphy. Please call again if we may provide additional service. Approved: �(' LL��" Melvin R. Nichols, P.E. Manager MH:MRN:kf Very truly yours, ALASKA /v/two EST B i Mark Holum v1 Geotechnical Ene A McHln R. Nichola 4� No. 4113-E DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION PLATTING OR PLANNING AND ZONING CASE REVIEW CASE NUMBER 5-5073 PETITION FOR REZONING OF Lots 1 and 2 Davidson Subdivison SPECIAL EXCEPTION new information) VACATION RE6USDIVISION DATE RECEIVED May 31, 1979 COMMENT TO PLANNING BY Not listed onFOR MEETING OF memo with others. of Cases COMMENTS: ENVIRONMENTAL SANITATION! PUBLIC WATER NOT AVAILABLE ENVIRONMENTAL ENGINEERING: 71 014 49/761 SS C 4.. DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION PLATTING OR PLANNING AND ZONING CASE REVIEW CASE NUMBER 5-5073 PETITION FOR REZONING OF Davidson Subdivision AE AYf NXCEPTION 1 6ON DATE RECEIVED February 2, 1979 COMMENT TO PLANNING By Feb 21, 1979 FOR MEETING OF of Cases COMMENTS: ENVIRONMENTAL SANITATION: PUBLIC WATER NOT AVAILABLE ENVIRONMENTAL ENGINEERING: 7- e 71.014 19/76) F � CONSTRUCTION AND OPERATION CERTIFICATE ALASKA DEPARTMENT OF ENVIRONMENTAL CONSERVATION. PUBLIC WATER SYSTEM APPROVAL TO CONSTRUCT Plans for the construction of r 3 blit water system located in t Alaska, submitted in accordance with 18 AAC 80.100 by have been reviewed and are O approved. O conditionally approved (see attached conditions). TITLE If construction has not started within two years of the approval date, this certificate is void and new plans and specifications must be submitted for review and approval before construction. APPROVED CHANGE ORDERS Change (contract order no. or descriptive reference) Approved by Date The "APPROVAL TO OPERATE" section must be completed before any water is made available to the public. APPROVAL TO OPERATE The construction of the public water system was completed on (date). The system is hereby granted interim approval to operate for 90 days following the cpmpletion date. by TITLE DATE As -built plans submitted during the interim approval period, or an inspection by the Department has confirmed the system was constructed according to the approved plans. The system is hereby granted final approval to operate. TITLE DATE r ALAS{CA ESTLQD 4040 "8" STREET ANCHORAGE, ALASKA 99503- (907) 278-1551. 1 . fir" :PaG@ April 5, 1979 C. Iaun;a n�^ W.O. A1II818 pe ?T. c t;oN Grid: 2324 Mr. Dan DavidsonC3 �CC,IV �" 8747 Endicott L� Anchorage, AK 99502 Subject: Subsurface Investigation for Suitability of On -Site Waste Water Disposal System S 1/2 of Lot 31, Jewel Lake Units Anchorage, Alaska Dear Mr. Davidson: Transmitted herein in accordance with your instructions are the results of the above referenced investigation as performed by us on April 5, 1979. The scope of this project is investi- gation for suitability of an on-site waste -water disposal system. Included in this transmittal are: Test liole Location Sketch Figure 1 Test dole Log Table A Explanatory Information Sheets 1-3 The exploration was conducted using a continuous flight solid stem auger. The rig is owned and operated by Denali Drilling, Inc. Drilling was supervised, the test hole logged and percolation test performed by Mr. 0.1-1. (latch, geologist with Alaska Testlab. The log of this test hole is included as Table A of this report. In interpreting the log it would be helpful to utilize the explanatory information contained in Sheets 1 to 3 of this report. When drilling was completed a 3/4" slotted PVC pipe was inserted in the hole to aid in determining the free water level. For the percolation test, the test hole was filled with water and left overnight to saturate. On returning the next day, the hole was refilled with water and the drop in the water level carefully monitored over the next 60 minutes. Mr. D -an Davidson April 5, 1979 Page Two This procedure is not a standardized percolation test, however, we understand that the Municipality of Anchorage, Department of Public Health and Environmental Protection prefers tests performed in this manner to evaluate a site for a proposed on-site sewerage system. Using the above test, the observed minimum percolation rate was 0.1 minutes per inch. This is an usually fast percolation rate as the soils are clean, granular, and fairly well graded. Vie suggest the system be designed for an absorption area of 70 square feet per bedroom. This recommendation is based on criteria in the "Manual of Septic -Tank Practice", U.S. Department of Health Education and Welfare, Public Health Service. Pie recommend that the seepage trenches be inspected prior to installing the system as the above recommendations are based on the result of a 6" test hole. The seepage trench will provide a much clearer picture of the subsurface condition than the test hole. If conditions are different than encountered in the test hole, it may be necessary to lengthen or enlarge the trenches. Pio water table was ohserved during drilling. Therefore it does not appear that the water table will interfere with the construction or operation of the system. We hope this report meets your present needs. If we can be of further service, please feel free to contact us. . Sincerely, ALASKA TESTLAB James R. Finley, Jr. JRFRMii:mm Enclosures Approved by: Melvin R. 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