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HomeMy WebLinkAboutSOUTHPARK #3 Block 1 Lots 10 & 33 S-7863 ,,-~ MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION Environmental Health Division ~ CASE REVIEW WORKSHEET CASE NUMBER: DATE RECEIVED: COMMENTS DUE BY: S-7863 Septer~ber 28, 1984 October 12, 1984 SUBDIVISION OR PROJECT TITLE: Lots 10, 33 Block 1 Sout~r~ Subdivision Addition #3 'ALASKA' UIRODFlleI TAL COFI I OL S, ,dlCE S, IrE. ~§in¢~ri~ $ ~nuiro~m¢~lol $1ucJi~s August 30, 19'84 S7863 OCT ! 5 1984 Mr. John Berggren 16420 Saint James Anchorage, Alaska 99509 Dear Mr. Berggren: On August 22, 1984, Alaska Environmental Control Services, Inc., performed five soils tests on Tracts C and E, South Park Subdivision, to see if soils suitable for on-site septic systems could be found. A small · backhoe was used. The soil logs for each test hole, and maps showing the locations of all the holes in the Tracts, are enclosed. LOCATION These Tracts are adjacent to South Park Subdivision, located within NW 1/4 Section 3, Ti1N, R3W, SM. Tract E is on the west of Terrace Wood Lane, and Tract C is on the east. LANDFORMS AND VEGETATION Tract C slopes gently uphill to the east, then abruptly upwards as the east border of the Tract is approached..' Tract E is fairly flat, with one slope over 25% abruptly starting near the northeast corner of the tract. Vegetation includes spruce, birch, and devils club. SOILS CONDITIONS Five test holes were done, at fairly evenly spaced intervals. Good soil was found in each test hole -- all soils were rated at less than 190 square feet per bedroom. Four of the holes had visually rated sands and gravels. Percolation tests were performed in tPo of the holes, with excellent results. The problem with the Tracts is the high water table. Water was encountered in every test hole, generally around 7 feet~ although it was at 10 feet for TH-D which is a little higher in elevation. A table below shows the change in the water table over a week~ in three cases, it rose. Test Hole H~0 level H~0 level z8~22-84 z8-29-8~ A 7 7 B 7 5.5 C 8 4 ~D ' I0 10 E 7.5 5 1200 Wesl 33roi Auenu¢. $~,¢ B · Anchoro% Aloska 99503. (907) 561-5040 )MMENDED SYSTEMS -.~Because the slopes are gentle and the water table high, shallow beds or 5-wides could be installed for septic systems built at the test hole locations~ Curtain drains to lower the water table might be possible, hut expensive, since a very long run of pipe would be necessary to daylight because of the gentle slopes. It might be better just to build the systems 4 feet above the water table. If homes are built uphill of the systems, lift stations could be avoided in most cases. In the case of test hole D, a lift station would be necessary, because the test was done at a high point on the lot~ and there is not room to build a house at a higher elevation. In the case of test holes B, C, and E, engineered designs will be necessary. Fortunately, the soils ratings are all so iow that the septic systems will be relatively small, thus keeping costs CONCLUSIONS [Five test holes were performed on Tracts C and E, South Park Subdivision. Although a high water table was found in each hole, the soils are excellent. Septic systems~ could be installed at each test hole location. Sincerely, Engineering Geologist Fr~nt TH- ~ TH- B N SCALE I"-~100~ Tt~ACT ~ TH-E I ~H-TiACT C TH- B N 0 R H $CA£ E I '~-- I00 ' MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L. Street, Anchorage, Alaska 99S01 264-4720 SOILS LOG -- PERCOLATION TEST LEGAL DESCRIPTION: .2 3 4 5 6- 7 8 9- DATE PERFORMED: SOILS LOG [] PERCOLATION TEST SLOPE SITE PLAN 10- 11 12- 13- 14- 15~ 16 18" 19- 20- WAS GROUND WATER ENCOUNTERED? IF YES, AT WHAT DEPTH? Gross Net Depth to Net Reading Date Time Time Water PERCOLATION RATE minu es/inch COMMENTS PERFORMED 2-008 (G/79) TEST RUN BETWEEN , FT AND FT PERFORMED FOR: LEGAL DESCRIPTION: MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAl- PROTECTION 8~'5 L, Street, Anchorage, Alaska 99501 264-4720 SOILS LOG -- PERCOLATION TEST DATE PERFORMED: T'csY f~ SOILS LOG [] PERCOLATION TEST 1 2 3 4 5 6 7 8 9- 10- 11 12- 13- 14- .. 15- 16- 17- 18- 19- 20- SLOPE SITE PLAN WAS GROUND WATER ENCOUNTERED? DEPTH? ~ Gross Net Depth to Reading Da'm Time Time Water - PERCOLATION RATE Iminutes/inch) TEST RUN BETWEEN FT AND FT CERTIFIED BY: ~ ' ~ PERFORMED FOR: LEGAL DESCRIPTION: · :!-: 10 15-' COMMENTS MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 625 L. Street, Anchorage, Alaska 99501 264-4720 SOILS LOG -- PERCOLATION TEST [~ SOILS LOG PERCOLATION TEST DATE PERFORMED:__ SLOPE SITE PLAN .,3 / WAS GROUND WATER ENCOUNTERED? IF YE~, AT WHAT DEPTH? S Gross Net Depth to Net Reading Date Time Time Water Drop PER LATION RATE FT AND TEST RUN BETWEEN CE:TIFIEO BY' (minutes/inch) ,/-~ /0 MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L, Street, Ancho~a§e, Alaska 99501 264-4720 SOILS LOG -- PERCOLATION TEST ~ 'SOILS LOG [] PERCOLATION TEST PERFORMED FOR: LEGAL DESCRIPTION( 6 7 8 g 12- 13- 15- 16- 17- 18- 19- 20- 5 o,-,'kk F,~,'- Jz.. SLOPE DATE PERFORMED: DEPTH? / ~lc p ~ _[ PERFORMED BY: PERCOLATION RATE TEST RUN BETWEEN Iminutos/inch) , FT AND , FT/ /oo .17'//, .~','~!,.~' D A T E: ~'f~c)/6~'(-~' / / ~ 72-008 PERFORMED FOR: LEGAL DESCRIPTION: 1 2 3 4 5 6 7 8 9- MUNICI'PALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L, Street, Anchorage, Alaska 99501 264-4720 SOILS LOG - PERCOLATION TEST PERCOLATION TEST S~OPE DATE PERFORMED: SITE PLAN 10- 11 13- 14- 15- 16- 17- 18- 19- 20- COMMENTS ..%, '/ ,-.H~- Z ¢o WAS GROUND WATER ENCOUNTERED? ~E YES PERFORMED ~ .... ~r~ s s Net Depth to Net Reading Date Time Time Water Drop ~ /o 3o / o lo3o :~ /~'1~ ~ ~'~ :2.3 PERCOLATION RATE ?'~' /,'oD lo (minutes/inch) TEST RUN BETWEEN ~ FT AND '~f"'~"', FT / ~[o~ CERTIFIED BY: ' ATE: / CHECKLIST SUBDIVISION REVIEW Subdivision Zoned Dar e WASTEWATER DISPOSAL Public Sewer Community Onstte Sewer Single-family Onsite Soil tests stamped by engineer, signed, dated, identified, etc.; Sufficient soil tests to characterize minimum of 50% of subdivision in probable absorption field areas~ Soil test locations accurately identified; Perc test data adequate; Groundwater monitored for 90 days, with last month occurring between June 1 and October 15; Accurate topographic map; Slope <25% in general region of original and replacement sites; D.E.C. approval of community system plans (if applicable); Bedrock outcroppings or shallow depth to bedrock; Sufficient setback from creeks, major drainages, other water bodies; Sufficient setback from cutbank or bluff; Sufficient setback from probable private well locations; Sufficient setback from community well(s); Sufficient setback from curtain drains; Curtain drains installed and ground water monitoring results shown; Thorough site visit (walk-through) completed; Minimum proposed lot size meets with DHEP and Zoning criteria; One original plus two replacement sites delineated for each lot, while maintaining all separation distances between replacement sites, property lines, water supplies, water bodies, probable building structure location, cutbanks, bluffs, etc., and in areas having less than 25% slope; WATER SUPPLY Public Water Water Single-family Wells ~D.E.C. approval of community water supply; Known water supply problems in the area; Water rights applied for from DNR for community wells; Meets all separation distances; Sources of contamination identified (dumps, chemical storage sites, etc.; Adequate water supply and acceptable water quality; Review conducted by KB5/ej/D18 Date STATE OF ALASKA DEPARTMENT OF ENVIRONMENTAL CONSERVATION CO STRUCTI©N AND OPERATION CERT FaCATE PUBLIC WATER SYSTEMS A. APPROVAL TO CONSTRUCT Plane for the construction or modification of [] ~pproved. / [] conditionally approved (see attached conditions). public water system located Alaska, submitted in accordance with 18 AAC 80.100 have been reviewed and are DATE If construction has not started within two years of the approval date, this certificate is void and new plans and specifications must be eubmitted for review and approval before construction. B. APPROVED CHANGE ORDERS Change (contract order no, or descriptive reference) Approved by Date APPROVAL TO OPERATE The "APPROVAL TO OPERATE" section must be completed and signed by the Department before any water is made available to the public, .~ 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 completion 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. BY TITLE DATE SOUTHCENTRAL REGIONAL OFFICE 437 "E" STREET~ SUITE 200 ANCHORAGE, ALASKA 99501 274-2533 August 24, 1984 Dan Green Triad Engineering 6937 Old Seward Hwyo Anchorage, Alaska 99501 Dear Mr. Green: Subject: South Park S/D Addition 2 Water Improvement 8521~FA-040 We have reviewed the plans and specifications for the subject project. The project is hereby approved for construction for the 'items with which this Department 'is concerned° This letter constitutes the permit required by AoS, 46o03o720(a) for approval of sewerage systems, Enclosed with this letter is a "Certificate To Construct" for the drinking water system° The "Approval to Operate" section of the certificate must be completed by a representative of this Departmen~ prior to placing the system in operation° It should be remembered that final approval will necessitate the submission of Engineer As Bu.ilt Plans. This will consequently mandate that a private professional engineer conduct basic inspection of this project so as to he able 'to sign off on as built plans. Arrangement for this 'inspection work is the responsibility o'F the developer. Sincerely, Bruce E. Erickson Environmental Engineer BEE/dd Enclosure 5720 4680 /0 5701 9 /,~ 467[ 1571 8 ' /4 /466 5741 5730 5 ~6~00 / 5 43]5 /43~5, 4301 / 9 / / t !/ ',,, 473[ 4741 i 38 / 29 /$0 !$! ~/6' 4620 4621 460l 4610 4600 4810 \ 5830 / 454O /9 444l 4450--~ /o ,/ /~ 85-241)