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Home My WebLink AboutTHOMAS S-7332 MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION Environmental Health Division CASE REVIEW WORKSHEET CASE NUMBER: $-7332 IDATE RECEIVED: November 1, 1983 COMMENTS DUE BY: NOvember 18, 191 SUBDIVISION OR PROJECT TITLE: Lo%s 1, 2 Thomas Subdivision ~ -) PUBLIC WATER AVAILABL~ ~! ) COMMUNITY WATER AVAI~ABI2~E COMMENTS: ~ t (//~ L)/EUBLIC SEWER AVAILABLE 71-014 {Rev, 5/83} -/_ I hereby certify that I have smweyed the following described property;~-_ ~%__ ~ _ __S~:_ P, ~.~ ~Zy~ ................. ~mm'ove~e~ls si~uate~ t~ereo~ are ~i[~in the ASSOCIATES, INC. GEOTECttNICAL ENGINEERING AND TESTING John M. Lambe, P.E. 7127 Old Seward Highway · Anchorago, Alaska 99502 907-349-0531 November 10, 1983 Fred Walatka & Associates 31[.'7 W. 29th Avenue A~chorage, Alaska 99501 t~ttention: Mr. Fred Walatka Subject: Percolation Test, Lot 2, Thomas Subdivision Gentlemen: This letter presents the results of the percolation tests wiqich we performed at your request for the refere'nced project. Percolation tests were conducted in a shallow Sandy Gravel, GP, layer and in a deeper Sandy Silt, ML, layer. The test procedures included three phases of field work. Phase one included a.} recording soil stratification and the installation of water level sheathing in a boring placed to 20 feet in depth and b.) setting up 1he percolation tests. Phase two involved monitoring the percolation rate in the potential absorption strata. Phase three consisted of recording the water level observed eight days after drilling. Phase one was completed on November 2, I983 with a Bombardier mounted drill rig. Mr. Roy McDonald, field technician on our staff was on site full time to direct the drilling, log the boring and obtain samples. Samples were obtained at intervals of 2 feet to a deo%h of 10 feet and at intervals of 5 feet thereafter by removing the auger from the borin§ and removing the sample from the flights of the auger near the bit. The performance of the drill rig and the boring spoil were also monitored to detect soil stratification. Each sample was visually classified in the field and carefully observed for indications of any frozen material or organic debris. The samples were sealed in plastic bags for transportation to JML Laboratories, Inc. where they were visually classified by a laboratory technician. All classifications were conducted in accordance with the Unified and Textural Soil Classification Systems. A one inch I.D. P¥C pipe slotted at interval's of 6 inches i n the and desi§ned to measure the free water level was installed boring. Water level measurements were taken and the test boring was backfilled around the pipe. From the data obtained in the boring, the most suitable strata for developing the absorption system were determined. Two additional borings were drilled approximately 3 feet away from the original boring to intercept the chosen layers and perform the percolation tests. A thin layer of gravel was placed in the bottom of these borings and then a section of 4 inch perforated pipe was placed on top of the gravel. Additional gravel was placed around the exterior of the perforated pipe in the bottom one foot of each boring. The remainder of the annular space between the pipe and wall of the boring was backfilled with the soils removed while drilling. The pipe was filled with water and allowed to soak overnight. On November 3, 1983, Mr. McDonald added additional water in 2 the 4 inch pipes, then monitored the drop in the water levels. Water was added to the percolation test several times, maintaining a maximum head of 6 inches over the §ravel in the bottom of the hole. The free water Levels in the instrumented borin§ were also monitored on this (late and on November 10, 1983. The results of the 1) correlations between the field logs and laboratory tests, 2) percolation tests, 3) water level measurements and 4) additional field observations are presented on the Department of Health and Environmental Protection IDHEP) Soils Log - Percolation Test 'Forms presented as Plates i and 2 of this report. Plates 3 and 4 present the Unified and Textural Soils Classification Systems, respectively. We trust the foregoing is sufficient for your needs. This effort was performed in accordance with current DHEP requirements solely to provide data for the DHEP to evaluate this parcel with respect to waste water disposal for subdivision design review. While intended to be comprehensive within this scope, it is not necessarily exhaustive of the possibilities. Please call if we can be of further service or if any questions arise. Very truly yours, Roe Sturgulewski, EIT Civil Engineer Approved bY~ /'John ~' ~Lambe, P.E. --Civil Engineer - 4254-E 3 PERFORMED FOR: LEGAL DESCRIPTION: 1 2 3 4 "UNICIPALI'rY OF ANCHORAGE DEPARTMEN ~ OF HEAt. TH AND ENVIRONMENTAL PRO, .:CTION 825 L. Street, Anchorage, Alaska ~9501 264-4720 SOILS LOG - PERCOLATION TEST 13 14 16 ~-~' - ,<~,~ ') 17- ~8 - ~v~ 19- 2o PERCOLATION TEST DATE ENCOUNT~ / '~' Gro~ Net Depth to Net ing Date ' Time Time Water Drop ~0 ,,,.~ 9'7 ~ '~"~,.. PERCDLATION RATE__ (minutes/inch) TEST RUN BETWEEN ~ ~-.FT" AND ~,-,_ . FT J, INIFIED SOIL C~.A$SIFICATION SYSTEM KEY TO T~_~T~:)ATA_. JOHN M LAMBE P.I!. Job No._ Appr;_ Date .~OIL CI. ASSIFI(~ATION CHART AND KEY TO TEST DATA_. PLATE 3 SOIL CLASSIFICATION CHART OR \ OR\ CLAY 0 ~/ \ C~..AY E Y ' CL SAND \ \ ii~i[~AV~ ;AN DY \ \ GRAVELLY I0 \ 20 ;50 40 ~ 60 70 GRAVEl (-I-:~4SCREEN) % BY WEI6HT CORPS OF ENGINEERS FROST DF-SIGN SOIL CLASSIFICATIO~= AND US~; EQUIVALENT GROUPING · FI F4 \ GRAV 80 90 I00 Gravelly soil~ 3 Io l0 GW, GP. GW-GM. GP-GM (a) Gravelly soil~ l0 to 20 GM. GW~M. GP~M (b) ~s 3 Io 15 SW. SP. SM, SW-SM. SP-SM (a) Gravclly ~ > 20 G M. GC (b) ~andS, cxccpI vc~ fine ~ J~ SM. SC s~lly ~n~ (c) ~a~,PJ> IZ ~ C~ CH (b) Vc~ fine s~y ~n~ ~ 15 SM (c) ~ys, Pl ~ ~2 ~ (?~ CL-~L olhcr finc-g~n~ ~ ~ ~nd SM; CL CH, ~nd SM PLAT 4 3) 4 Li-'NDBORG FIBERGLASS REINFORCEr) SEP'II'IC TANK TillS I'ANK I'I[[I'S ALL SI.ATE SPECIFICATIONS DAFE OF MANUFACI'URING ASS[MBI Y PROCFDURE: l) '.!HIM USING PARIIIlON FOR DOUBI_E COMPAI{TMFNT, INSERT IN KEYWAY WITtt TEE POINTING UP AND (lll Jill El. SIDE OE PARI'ITION. !~OI 1 IO{;I flIER WI'Iii GAI. V1NIZED B()I ¥S, USING WASIIERS ON TOP A~'ID BOTTOM. USIHG PVC GLUE, IHSTAII INI ET A;~D OUTLET TEES AS MARKED. ~lu,'ndi/cmrcd hr: I'II~[{R(;I .,NS% ~l~tt'/~<'l<'r/ hr.' BII('t<'5; HI!l[ I)IN(; %PI'(IAI TII:N Nm/'c u//(I (?17~('(': 27 I0 %pelnlrd I{(md ' 'I elcphOl)C 27g-1142 I)lu/// u//d II ~tr<'l/o/tsc: ,40() ~V. Inl'l Ai]'p(~t Rd. · l'clclq~onc 279-9833 GAL. CAPACITY SERIAL NO.__ F!II-I-NN EIB SItOIIID [~[] PERI~ENDICIJIAR TO LENGFIt OF TANK. AREAS WttERE LIDS ARE ~0 BE SFAI.[.[], CAtJLK FLANGE AROUND MANWAY BEFORE ll)S ARE INS[Al. LED. IR(IM INSIDE OF 1AHK, CAI)I K AROUUD Iiil.El.~,[OCKi!lG FLANGE IJSING 1/4" DEAD. [NSIAI lA,ION PROCEI)UR[ : IlPll "'[' [ Fi IA!Z(;[ I'!;'~(;U I0 AllOW Al- ! FAST g [rlCIIES FROM SIDES OF TArlK I XCiP[ IOR IiAND-DIJG HDLI . USING I*I{A-GRAVEI , PROVII)I! AT LEAST 3 tI'ICHI!S I.I!VEL I~ACKFII. I_ BED. IH ROCK, STOUF, SHAI. E OR ClAY AREA, PROVfI)E 6 [HOLIES OF BED. POUR PEA GRAVEl Om OTII[R ACCFPlED MATIRIAI_S AROUND TANK UNII[/RMI_Y TO TOP OF TANK. NO'fi : Ill ARIAS Wlt[kl: F'I:A GRAV[!I. IS NOr AVAII_ABI. E, ECONOHICALLY, SAHIB, $10NE EIUIS!tIh(; I)R O[UER ACCEPTABt. E BACKFILl_ MATERIAl_ MAY BE USED. NOTE: NOTE: '['0 BE PU,~!'ED FROM INLE~r END ONLY. LENDBORG SEPTIC TANK ManuJ?~ctttred by: FIBERGLASS PRODUCTS Marketed by: BUCK'S BUILDING SPECIALTIES Store and Q£fice: 2710 Spenard Road · Telephone 278-1142 Plant and Warehou.~'e: 400 W. lnt'l Airpor! Rd. · Telephone 279-9833 Introducing the Lendborg Fiberglass reinforced septic tank. Meets all State Codes. Available in single 8, double compartment. Bolts tagether at factory or on job site. Tees 8, bolts included. May be hauled in pick-up truck. Two man installation. Price for 1000 gal. tank. Fully warrantood. Anchorage 825 "L" STREET ANCHORAGE, ALASKA 99501 (907) 264-4111 (:H:ORGE M. SULLIVAN, MAYOi4 February 11; 1981 TO: All Subject: Excavators, Tank Suppliers Supplemental Information Regarding On-site Sewer Installations and Septic Tank Construction Extended use of septic systems and monitoring of sludge build-up in the second compartment will require occasional pumping maintenance. A cleanout standpipe to the second compartment of the septic tank is required for 1981 construction season. If there are any questions, please call this office at 264-4720. Sincerely. Environmental Spec~ist LNB/ljw SWP/81-1 _~ o~ 1 '33 T~/II IGIqT LA NE ~a~st f/ff~,~.J~[~'ec, ,'~73' 75) 1'318. 50'(/lea~~ L IJA 1¥ I