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Home My WebLink AboutNORTH WOODS Subdivision Review CROWSER Earth a~d E~vfronrnenta! Technologies Northwoods SUbdivision Review of the Data, Methods and Conclusions Developed by the Department of Health and Human Services... Prepared for MunicipaJity of Anchorage Department of Health and Human Services February, 1987' A~8085-0 1 A-808§-01 Page 10 Assessment of Attachment II - Northwoods Subdivision, On-Site Septic System Test Results and Conclusions The conclusions presented in Attachment II appear to be formed from the procedures presented in Attachment I. In our opinion, the need for additional groundwater information is often indicated by the standpipe level information, but may not require installation of 2 wells on each lot with more than 50% of the gravel depth saturated at this time. An alternative approach is presented the Recou~ended Program Modifications. HART CROWSER ANALYSIS OF DATA IN CURTAIN DRAIN AREA Drainfield Failure Septic drainfields do not meet State and local ordinance when the seasonal high water level is within 4 feet of the bottom of the absorption system. Evidence for this type of failure in the ~urtain drain area has been indicated by high bacteria counts from curtain drain ~ampling, dye tracer tests, toilet paper residue reported fin the exposed curtain drain, and high seasonal water tables measured in th~ observation wells. Each of these factors is discussed below. Water sm~ples collected on a regular basis from the discharge point of the curtain drain have indicated probable drainfield failu're. Analyses have indicated the presence of fecal, coliform and fecal streptococci. ~ecal coliform and fecal streptococci are generally accepted as indicator organisms of fecal contamination. The literature suggests that a r__~atio of fecal"coliform to fecal_ streptococci of four or greater is indicative 'of human waste within the limitations of the sample's pH, time from source, and fecal str=ptococct. Properly functioning septic systems should remove these bacteria and by INC; ~ CHEMICA A & GEOLOGICAL LABORATORIES OF A 1',.,4SKA, ANCHORAGE INDUSTRIAL CENTER 5633 B STREET ANCHORAGEoAI.J~KA9951~ . '- TELEPHONE (907) 562-2343 ~ EEFER QUESTION TO: Daniel J. Bacon APPROVED BY: Stephen C. Ede Cr.T~N~ MOA Health & Human Services' Cr,T~q~ p. O. '~'' 60565 ADDEESS P.O. Box 196650 SAMPT,~ ~SY~.TVED: 5/12/86 1330_ Anchorage, AK 99519 SAMPT,w-q COT,T,WCTED: ' 5/12/86 110% DATE, ANALYZED .~ 5/12/86 LAB SAMPrR NO. ~/. 2831-3 · CLT~NT.'SAMPT,F,.'I~D. :, H-1 L2, B4 North .w.~ods · PULTRtX: 'Water Standard Methods, 16th Ed. ~ COT ,T'POlr¢4 FEC..AL STREP TCFf~ COT,'FF. 01:~ *GT - greater than *LT- less than . 0 per 100 mls 5O per 100 mls per 100 mls Not Held ND = ~ D~'~ECTED DEiZCi~CN T,TMX~ Il; ( ) :m-voIcz '9 .'37372. ~'~~ & GE6..,OGICAL LABORATORIES O. ALASKA, INC. ~,< TELE""O"E (90,:-2,9m,4 ^NC.ORA~_?D_U?.A~CENTER ~'~~ 274-3364 Wator ~nalysi$ ~oport for lotal Coliform Bactoria Drinking ~'~ - BE CO MPLETED BY WATER SUPPLIER TO BE COMPLETED BY LABORATORY W~ate~r System Name Phone No, Mailing AddresS City State Zig, Code SAMPLE DATE: Mo. Day Year Rout:.: Check Sample (for routine ~mple with lab ret. no. ) ~ Treated Water Special Pu~ose D Untreated Water Time ~ll~t~ SA~LE ~ LOCATION ~ Analysis shows this Water SAMPLE to be: [] Satisfactory [] Unsatisfactory [] Sample too long in transit; sample should not be over 48 hours old at examination to indicate reliable results. Please send new sample, Date Received - / D -/~; Time Received /~)~) 0 Analytical Method: [] Fermentation Tube [] Membrane Filter Lab Ret. No, Result* Analyst I FT~ I l--I--I READ INSTRUCTIONS BEFORE COLLECTING SAMPLE 06-1220 (b) Rev. 197~ BACTERIOLOGICAL WATER ANALYSIS RECORD 24 Houri 24 Houri EMS Broth 24 houri; Bro(h 41 hourl~ MemPflne Filter: Ol~t Count ,.Collfo~ll/lOOntl & GEt, ,)GICAL LABORATORIES t, ALASKA, INC;~ TELEPHONE [907) 562-2343 ANCHORAGE INDUSTRIAL CENTER 5633 B Street Drinking Water Analysis Report for Total Coliform Bacteria ~ TO BE COMPLETED BY WATER SUPPLIER WATER SYSTEM: Water System Name Mailing Address State Zip Co~ city Mo, Day Year SAMPLE TYPE: [] Routine [] Check Sample (for routine sample with lab ref. no. ! r-I Treated Water [] Untreated Water [] s .c,a, 27° SAMPLE Time Collected NO, . LOCATION '3 Collected , By -t TO BE COMPLETED BY LABORATORY Analysis shows this Water SAMPLE to be: [] Satisfactory · . [] Unsatisfactory [] Sample too long in transit; sample should not be over 48 hours old at examination to indicate reliable results. Please send new sample. Date Re~celved ./~)- Time Received q~fO Analytical Method: ~/I ~ Fermentation Tube / [] Membrane Filter I Lab Ref. No. Result* Analyst / 0~-t220 (~! BACTERIOLOGICAL WATER ANALYSIS RECORD Rev. 1971 READ INSTRUCTIONS BEFORE COLLECTING SAMPLE I~re~met lye 10mi 10mi 10mi 10mi 10ml 1.0ml 0./mi ,. Col| form/10~1 ,BGB · Collform/l OOml & Gl[-' )(;IGAL LAflUItAIUfllI~ tLA~It, A~ TELEPHONE (907) 562-2343 ANCHORAGE INDUSTRIAL CENTER 5633 B Street Drinking Water Analysis Report for Total Coliform Bacteria TO BE COMPLETED BY WATER SUPPLIER WATER SYSTEM: Water System Name I.D. NO. ( Pho.e No. Mailing Address City State Zip Code Mo. Day Year SAMPLE TYPE- ." (~"~ E] Check ~mple (for routine ~mple with lab ref, no. ) u ;reateo water D Special Pu~ose ~ Untreated Water NO. --LOCATION Rev. 197~ TO BE COMPLETED BY LABORATORY Analysis shows this Water SAMPLE to be: [] Satisfactory [] Unsatisfactory [] Sample too long m transit: sample should not be over 48 hours old at exam~na[ion to indicate reliable results. Please send new sample. Date Received Time Received Analytical Method: [] Fermentation Tube /~Membrane Filter ~Lab R._e.f. No. Result* Analyst BACTERIOLOGICAL WATER ANAI~.YSIS RECORD READ INSTRUCTIONS BEFORE COLLECTING SAMPLE R~o~'t~l lay _ C~llform/[ 00mi BOB Co~lform/t O0ml 4'5 5~ T,~Cr C ?R~C?' 81