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Home My WebLink AboutCOM 0201.000 2000-2002 oiozos March 13, 2001 Mr. Dennis I~ee Chief Engineer Department of Public Works County of Hawaii 25 Aupuni Street Hilo, Hawaii 96720 Dear Mr . I,ee Subject: Kapehu Wastewater Treatment Plant Operation and Maintenance Inspection Our operation and maintenance inspection report for the subject facility is attached for your information and use. Department staff inspected the facility on September 28, 2000. The facility has been discharging effluent of good quality as evidenced by the low monthly averages of BOD and TSS concentrations. Facility operations were satisfactory as there were no major problems with any of the plant processes. The Kapehu Wastewater Reclamation Facility is given an "Acceptable" general rating. During the inspection, staff noted that the inspection of the rock media is difficult as it is located in an underground cavity with no access ports. This design of the plant may hinder the operation and maintenance of the treatment process. Should you have any questions, please call Sanford Nakamura of our Wastewater Branch at our direct toll free no. 974-4000, extension 64294. Sincerely, THOMAS E. ARIZUM P.E., CHIEF Environmental Management Division SN: erm Co~T1ZY1: NO. ~ V Attachment File No. ~ ~ W c: County Public Works Committee Chairperson ~,ef, 1'0; _ r n'1 e-- f, ~a~ ~ ~ zoc~ 04i2B%01 THt? 14:57 FA,Y: 8089618644 DPW-WASTEWATER DIVISION DPW 002 OPERA°T'TON PAD A~3NTEPiAR1'CE INSPECTION' REPORT' ~~'1"RODU'CT.IOd~ Facility: Kapehu Wastewater Treatment Plant Date(s) of Inspection: September 28, 2000 Inspector{s): Sanford Nakamura Facility Representative(s)/Job Title: kyle Hirota/wwTp Superintendent Charles Dawrs/operation Supervisor EACIZGROVI~D 1. Cur~eex~t status of ~de£iciencies cited in pr~i.vious inspecti®z7. rep®rts: ~e£ie~.ency: BODS loading exceeded the design value during three (3) months of the year. Sources contributing to th.e high BADS loadings should be identified and prevented from entering the plant. Status: GODS loading' again exceeded the de~3ign value during three ( ~ ) months of the year . Due to the lc~w influent flow, BOD loo-dings fluctuate more resulting in higher and lower average. Sources contributing to the high BOD loadings have been difficult to find. Oe£iciency: An access cover should be provided for the seepage pit. The seepage pit should be inspected for proper f~±nctioning . Statsas: An access cover was not installed fox' the seepage pit, however a new 6-inch cleanout was installed approxitr~ately 15 feet from the entrance of the existing seepage pit_ A camera is inserted into the cleanout and is used to monitor the status of the seepage pit. Recent video tapes showed. the pit functioning satisfactorily. 13e£icieney; 'The mixed liquor had a light; grey colon' and appeared to be slightly septic. The rocks in the tanks should Le inspected to ensure that adequate biolog%cal treatmes.t is being provided for the wastewater. 04i26i01 THU 14:57 FAX 8089618644 DPW-WASTEWATER DIVISION DPW [7j 003 Kapehu Wastewater Treatment Plant March 13, 2001 Page 2 Status: The mined liquor had a light grey colox• and appeared normal for the rock media hype of treatment. The iraspect~.on, o~ the rock media i.s difficult ,as it is located in an underground cavity with no access ports. Defici.ncy: The sewer user charges are not adequate to cover the an~iual operational and maintenance expanses for the I-Tawai.i County Wastewater ~'reatment Facilities. Status: The Wastewater Division will be prr,~poaing revi.sioxis to the Hawaii County Code to increase tk~.e •usez rates. 2. 1iTPD~'S Permit Statue: Not applicable. 3. ~nfeoxcemexat Acta~on: Not applicable. 4 . Capacl~y Axialysis ~veragP flow: 0.008 MGb (F`or the period 09/01/99 to Q8/31/L?0) Design xlow: 0.16 MGb; Percent of design Capacity: 5~ Previo~.~s year's: The average flow rate to the facility decreased by 23 percent when compared to l;~st year's flow rate. Last year's average flow rate to the facility was 0.0095 MGD or 6 percent of the design capar~itx. 5. ~odifinations/Additi®za.s Planned/T~~-esezst Coastructiorf ~tatius: None. CU~~I~`1` ~,NS~~.EC~'~O.ZIa 1 . ~9[aint~narace : Check either : No . of : Preventive Main;tez'~ance : _ x Current Backlr~gged Corrective Maintenance: ~x Satisfactory „_,,,....w Unsatisfactory Major (or all) items requiring repair/replacement: 1~7one . 04/26/01 THU 14:57 FAX 8089618644 DPW-WASTEWATER DIVISION DPW ~ 004 Kapehu Wastewater Treatment plant' March 13, 2001 Page 3 2. Reuse: The facility has a T3OH approved effluent irrigation plan: Yes No X Not applicable 3. NPDES or Chapter 62 violations (effluent limitations, spil,l,s, etc.) None_ ~4. Vasual r~uality a£ ef£lueat on date of inspe~otioai (i~aspactor' s j u,dgmeat) The effluent appeared to be satisfactory anal relatively Clear. 5. Daboratory i5ata: The following influent and effluent data w~;re Collected for the period September 1999 through August ~C~00: a. Influent BODS and TSS averaged 258 mg/.1 and 144 mg/1, respectively. b . Effluent GODS averaged 7 . 8 mg/ J, and effluent TSS averaged s.6 mg/l. 6. Facili't~+''s Paresemt Deficiencies: The sewer user charges are still not adequG~.te to cover the annual operational and maintenance expensesr for the Hawaii County wastewater Treatmez~.t Facilities. The Wastewater Divi.sio~. will be proposing rev~.aions to the: £~awaia~ County Code to increase the user rates. 7 _ I~ecomaatexidations An access cover is still recommended to facilitate inspection of the seepage pit. The seepag~~ pit has no access cover and is difficult to inspect. Anew 6-inch cleanout was installed appro~i.mately 15 fe~:~t from the entrance of the existing seepage pit. ,A, cekmera is inserted into the cleanout and is used to monitor the status of the seepage pit. o4%26101 THU 14:58 FAX 8089618644 DPW-WASTEWATER DIVISION ~3~ DPW 0 005 Kapehu Wastewater,Treatme~.t Plant March 13, ~C301 P~.ge 4 Y 1. General Ratiztg': X ACCEPTABLE CONDITIONAL, ACCEPTANCE UNACCEPTABLE Explanation: The WW'rP is given a general rating of "ACCEPTABLE." The Kapehu WW7:'P was discharging effluent of good quality as evidetzced by the low BOD and TSS concentraticans. Tn general, plant operations were satisfactory as th~:re were no major problems with any of the plant processes.