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Home My WebLink AboutT15N R1W SEC 7 LT 70 S-8115 MtJiNIClPALITY OF ANCHORAGE [)EPARTMENT OFi HEALTH & ENVIRONMENTAL PROTFCTION Environmental Health Division ~.,~,~ CASE REVIEW WORKSHEET CASE NUMBER: DA~E RECEIVED: S-8115 ~pril 16, 1985 SUBDIVISION OR PROJECT TITLE: i Lots 70A, 7OB Bryan Estates Subdivision ) PUBLIC WATER AVAILABLE ) COMMUNITY WATER AVAILABLE COMMENTS: COMMENTS DUE BY: May 10, 1985 ) PUBLIC SEWER AVAILABLE 71-014 (Rev. 5/83) MEMORANDUM DATE: TO: FROM: SUBJECT: June 28, 1985 Jerry Weaver, Cgmmunity Planning Department Robert Wo Robin~on, Manager, Environmental[ Health Division, DHHS LOTS 70A & 70B,]BRYAN ESTATES SUBDIVISIO - S8115 In view of the ~irm position taken by the Alaska Railroad that on-site disposal facilities will not be installed on their right-of-way ease- ment, our requirements for plot approval of this subdivision are as follows: 1o There shoulR be a note placed on the recorded plot ~ich clearly states thatl on-site wastewater disposal facilities will not be installed oh the Alaska Railroad right-of-way. 2. Without having access to the field survey data or a planimeter, it isn't possible to precisely determine the lot bonndaries used in arriving at~ the 56,000 sq. £t~ lot size for 70B or 42,000 sq. ft. lot size fo~ 70Ao If however, the northernmost 33' BLM easement is deducted! from the overall 330' X 330' tract, the combined net total of 70A and 70B would be 98,010 sq. ft. This compares with the total o~ 98,000 sq. ft. shown on the plot as the total of lots 70A (42,000 sq. ft.) and 70B (56,000 sq. ft.). It is quite apparent that the cul-de-sac area and the Alaska Railroad righ-of- way easement is included in the lot sizes shown on the plot. The cul-de--sac !area and the ARR easement area contains approximately 10,150 sq.f~, and 5,900 sq. ft. respectively. ~e net lot sizes adjusted for the above areas, are approximately 42,900 sqo ft. in lot 70B andi 39,050 sq. fto in lot 70A. The lot sizes shown on the plot should~ be revised to show the correct square footages of each lot. o The small inset on the plot showing the topography (contours) of the proposed lots is not satisfactory° Based on the small inset, there is a ~ground elevation difference of 90' between the southeast corner of l~ot 70A and the northwest corner of lot ~0B. This ~ represents lan overall slope of approximately'20% which is the maxi- mum allowedi for a conventional[ on-site wastewater disposal systemJ.-z~ There are undoubtedly areas on both proposed lots which exceed ~0%/P slope and ~ould not be considered to be acceptable for on-site ' ~ disposal siltes. We therefore must have the contour lines shovm on the two proposed lots. June 26, 1985 Jerry Weaver - Memorandum Page Two Both soil test holes approximately 10' outside of the boundary of the proposed cul-de-sac which is not necessarily indicative of the soils condition in the area when the original and/or two replace- ment on-site disposal sites will be located. In view of the questionable slope condition and the unusable area underlying the ARR easement, there must be an additional soil/perc test with water monitoring data taken on both lots in an area considered to be acceptable for an on-site disposal system site° Environmental Health Division, DHHS LOTS/m/dMWD1 ~" SOILS LOG PERFORMED FOR: MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L. Street, Anchorage, Alaska 99B01 264-4720 SOILS LOG - PERCOLATION TEST L~ ,- ~q.o'.~ 3 11 13 14- 15- 16- 17- 18- 19- 20- COMMENTS PERFORMED BY: 72-008 (6/79) SLOPE WAS GROUND WATER ENCOUNTERED? IF YES, AT WHAT DEPTH? [] PERCOLATION TEST DATE PERFORMED: Z~' - ~::? - ~X.~'~ / / .tcd, ,.S',P/. SITE PLAN PERCOLATION RATE (minutes/inch) TEST RUN BETWEEN /. FT AND ~ FT CERTIFIED DATE: /// Gross Net Depth to Net Reading Date Time Time Water Drop / SOl LS LOG PERFORMED FOR: LEGAL DESCRIPTION: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2O COMMENTS MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L. Street, Anchorage, Alaska 99501 264-4720 SOILS LOG - PERCOLATION TEST WAS GROUND WATER ENCOUNTERED? DEPTH? [] PERCOLATION TEST SITE PLAN Gross Net Depth to Net Reading Date Time Time Water Drop PERCOLATION RATE //lb (minutes/inch) TEST RUN BETWEEN FT AND FT PERFORMED BY:~~ ~g57,~' 72-008 (6/79)