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All Journal TEKNIK Jurnal Profesi Insinyur Indonesia
Haryono Setyo Huboyo
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Transportation

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ANALISIS RESIKO KONSENTRASI DEBU (TSP) DAN TIMBAL (Pb) DI PINGGIR JALAN TERHADAP KESEHATAN MANUSIA STUDI KASUS KOTA YOGYAKARTA Setyo Huboyo, Haryono; Syafrudin, Syafrudin
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (659.681 KB) | DOI: 10.14710/teknik.v28i2.2115

Abstract

Motor vehicle emission generate numerous harmful pollutants in the street every day, some of them arecarcinogenic such as TSP and lead. Yogyakarta is one of represent city which has high traffic load so that thecontamination effect is pronounced. This research was aimed at analysing the risk from related pollutant forpeople who live or work in the vicinity of main streets. This work consists of four steps i.e hazardidentifications, exposure assessment, toxicity assessment, and risk characterization. High volume samplerwas used to catch ambient TSP, spektrophotometer was used for Pb analysis further. Fifteen main streets hadbeen selected for field sampling. Hazard identifications to TSP and Pb concentration was mirrored toambient air standard that maximal concentration for the TSP is 230 μg/m3 and for Pb is 2 μg/m3. Onexposure assessment the TSP concentration in Wates street, Janti, Godean street, Solo street, PKUMuhammadiyah, and STTL exceed ambient air standard (Kep. Gub. DIY No. 513/ 2002), whereas for Pb, allstreets comply to standard. Toxicity assessment revealed that TSP intake in all place was safe since thecalculated intake were still under maximal intake 0,074 mg/kg.day. The circumstance was also true for Pbthat the intake do not exceed 0,00065 mg/kg.day. Based on risk characterization result, it can be concludedthat level of total risk in all places was less than unity so it implies that in those area was safe for dailyactivities in specified time with respect to pollutants of interest. However the relative high risk was pointedout to the Ahmad Dahlan street and the lowest risk was in the Magelang street. Average total risk inYogjakarta city was 0,034.
Evaluasi Pelaksanaan Dalam Kajian Biaya Lebih Pada Pekerjaan PLTU dengan Jenis Kontrak EPC: Studi Kasus Pekerjaan PLTU Oleh PT.X Haryono, Sony; Silviana, S; Setyo Huboyo, Haryono
Jurnal Profesi Insinyur Indonesia Vol 1, No 6 (2023): JPII
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpii.2023.18833

Abstract

Coal Fired Steam Power Plant (CFSPP) Project is a complex project that requires multidisciplinary knowledge in its implementation. As a result, cost overruns often occur in its implementation. In Indonesia, most power plant projects are using EPC contracts (Engineering, Procurement, and Construction). The contractor is fully responsible for any failures that may occur during the work implementation period. The aim of this study is to compare the realization of completion costs for CFSPP projects with Bill of Quantity (BoQ) and the factors that influence deviations. This research was conducted qualitatively based on the data obtained. Deviations are calculated based on the difference between completion costs and BoQ. Discussions and interviews were conducted with Project Managers and Site Commercial and Risk Managers who were directly involved in construction phase to determine the causes of cost overruns. The result is that the actual cost incurred in the CFSPP project is 3x the cost listed in BoQ. There are cost overruns in each work group including Civil Works, Mechanical Works, Electrical Works and Others Works. Indirect cost realization is 29.84% of total completion cost. The factors that influence cost overruns are: (i) Contractors do not understand the details of the work to be done, (ii) Changes in design and (iii) Realization volume exceeds initial planned volume. The results of this study are expected to be input in preparing owner estimate for CFSPP projects and adding new risk factor lists in CFSPP during construction phase.
Co-Authors Haryono, Sony Silviana, S Syafrudin Syafrudin