Analysis Quality Control in Project Development Warehouse PT Santos Jaya Abadi Using the Process Decision Program Chart Method

Construction project must have quality control to guatantee safety worker. However, even though technical specifications have been prepared, deviations in quality during construction project implementation always occur, so the great of the building does now not comply with the satisfactory requirements which have been set and reasons the low quality of human resources in the construction global. This research began with data collection through the process decision program chart method and questionnaire method, distributed to project warehouse PT Santos Jaya Abadi. The collected data questionnaires were analyzed using Process Decision Program Chart Method dan Microsoft Excel. The analysis quality control and analysis risk show that quality control effective and implemented in project contruction. The result of structure work such as beam and column have the same percentage of 76%, floor plate has a percentage of 72%. While on structure work beam has risk level value 7.49, column with a value of 7.42, floor plate with a value of 6.43. , floor plate structure work with a value of 6.43.

Construction project must have quality control to guatantee safety worker. However, even though technical specifications have been prepared, deviations in quality during construction project implementation always occur, so the great of the building does now not comply with the satisfactory requirements which have been set and reasons the low quality of human resources in the construction global. This research began with data collection through the process decision program chart method and questionnaire method, distributed to project warehouse PT Santos Jaya Abadi. The collected data questionnaires were analyzed using Process Decision Program Chart Method dan Microsoft Excel. The analysis quality control and analysis risk show that quality control effective and implemented in project contruction. The result of structure work such as beam and column have the same percentage of 76%, floor plate has a percentage of 72%. While on structure work beam has risk level value 7.49, column with a value of 7.42, floor plate with a value of 6.43. , floor plate structure work with a value of 6.43.

INTRODUCTION
control can be used as an evaluation step for the performance that has been carried out in carrying out quality control. Quality control on projects is usually carried out with measurements made by using a tick on a certain check sheet to evaluate the quality process management step that will occur or specifications and criteria as the selected step. With this, a project that will be involved has a certain target for achieving project quality as desired by consultants, contractors, and owners.
Project development warehouse PT Santos Jaya Abadi is one of the projects currently implementing a quality control system. To find out the implementation of the quality control system at the construction development of PT Santos Jaya Abadi, an analysis of quality control was carried out and what factors were the obstacles to its implementation. Because the warehouse construction project found risk factors that cause the work achieved is not optimal, this is what underlies the author to conduct research related to quality control.

THEORETICAL REVIEW Making Fishbone Diagram
Fishbone diagram is an approach to identify various potential causes of an effect or problem, and analyze the problem through brainstorming sessions. Problems will be broken down into a number of related categories, including people, materials, machines, procedures, policies, and so on. Each category has causes that need to be explained through a brainstorming session. The steps taken at the fishbone diagram stage are as follows: a. Define a problem. b. Identify categories. c. Finding the potential causes of each category. d. Conduct a study of the most likely causes

Making Process Decision Program Chart
Process Decision Program Chart is a diagram to map activity plans along with situations that may occur so that Process Decision Program Chart is not only made to solve a final problem but also to cope with risk surprises that may occur. In other words, Process Decision Program Chart is used to plan scenarios. If, in a certain situation, there is a problem, we have planned how the problem is likely to be solved so that we are ready to handle it

Data Collection Technique
At this stage, the data needed for analysis and report generation for this research includes primary data and secondary data. The primary data needed in the data collection stage is the result of direct observation and questionnaires to related parties to determine the level of risk that can cause quality control in the implementation of structural work to be less than optimal.
Questionnaires are information obtained by collecting data needed in research by directly asking construction workers at the project construction warehouse PT Santos Jaya Abadi and filling in the data through questionnaires distributed to construction workers.
Observation is the observation of a work process in a construction project, then understanding the knowledge of a phenomenon based on previously known knowledge to obtain the information needed on the project construction warehouse PT Santos Jaya Abadi.
Secondary data needed in the data collection stage is the work plan and technical terms and detail engineering design. The secondary data was obtained indirectly through the contractor PT Prambanan Dwipaka to determine the quality control and implementation of work on the construction project of PT Santos Jaya Abadi.

Analysis Level of Risk
Risk analysis is to determine the magnitude of a risk which is reflected in the likelihood and severity of it. According to AS/NZS 4360 Risk analysis is an opportunity for an event to have an effect on an object. Risk assessment is intended to determine the magnitude of a risk probability of occurrence likehood, severity or consequences.

Figure 1. Risk Rating
A simple way is to create a risk rating like the example above where the likelihood and severity rating is given a value between 1-5. The risk value can be obtained by switching between probability and severity, which is between 1-25. From the picture above, a risk rating can be made, for example: Data processing was carried out using tables obtained from distributing questionnaires to research needs. While data were analyzed based on Risk Ratings. To determine risk assessment by first estimating the value of consequences and opportunities. The risk value can be calculated manually, based on the formula Impact x Probability to get score for assement analysis risk.

Analysis Performance Quality Control
Risk management from AS/NZS 4360 have standard has been utilized before to give an overview of specific risk management methods for concurrent engineering projects. Besides that we have the freedom to use which rules are used to determine the risk category of a construction project According to Nurrohmah (2020), the score interpretation criteria based on respondents' answers can be determined as follows: the maximum score for each questionnaire is 5 and the minimum score is 1, or ranges from 1% to 100%. Then the range between scores is 19%. So that the following criteria are obtained. Table 1. Interpretation Score Highly Effective The interpretation of this score is obtained by comparing the impact item score obtained based on the respondent's answer divided by the maximum score of the answer then multiplied by 100%.

Figure 2. Flowchart
The stages in data analysis are a sequence of research steps carried out systematically and logically so that the right analysis can be obtained to achieve the author's goals. The following are the stages of the sequence of analysis in this study. is carried out to conduct research and obtain data from the construction service provider. 5. Collecting Data Stage: At this stage, the data needed for analysis and report generation for this research includes primary data and secondary data. Primary data is a source of research data obtained directly from the source. Secondary data is a source of research data obtained by researchers indirectly through intermediary media. 6. Analysis Stage: At this stage the data obtained will be analyzed using the Process Decision Program Chart method. The steps taken at this stage are as follows. 7. Conclusion and Suggestion Stage: The data that has been analyzed will make a conclusion that is in accordance with the objectives of this study so that it can provide suggestions to related parties to maximize the quality of implementation of the project to get the desired quality. For more details, the research stages can be seen in the research flow chart. The research was conducted using a descriptive method, namely describing, examining, and explaining something that was studied as it is, and make conclusions from observable phenomena using numbers. They are two kind data in this research. First is primary data is a source of research data obtained directly from the source. Then secondary data is a source of research data obtained by researchers indirectly through intermediary media. Primary data in this research such as observation and questionnaire. Secondary data ini this research are work plan and technical terms.
Population is a generalisation which consists of quality objects or subjects and has certain characteristics so that researchers can draw conclusions from a study. In this study, the population includes workers who are in the PT Santos Jaya Abadi warehouse construction project.
Sampling technique is a technique used to take sample Sampling technique is a technique used to take sample members who are part of the population. Sampling techniques are used to take samples so that they are guaranteed to be representative of the population. The sampling technique used in this research is saturated sampling. Saturated sampling is a sampling technique when all members of the population are used as samples. Saturated sampling is often done when the population is relatively small, less than 50 people. In determining the sample, the researcher used the Slovin formula to determine the respondents on the questionnaire. The slovin formula used is as follows : Slovin's Formula = = = = 14,58 people Researchers rounded the respondents to 15 people

Fishbone Diagram
Fishbone diagrams or cause and effect diagrams show the relationship between the problem at hand and its possible causes and influencing factors. Identification of risks that may occur in a construction project activity is vital in quality control of construction projects. Techniques used in risk identification include discussions, observations, interviews, historical information, and others.

Figure 3. Fishbone Diagram
After knowing the types of problems that occur, it is necessary to take corrective measures to prevent the emergence of similar problems or work accidents. The important thing to do and explore is to find the cause of the defect. As a tool to find the cause of the defect, a cause and effect diagram is used or called a fishbone diagram.

Process Decision Program Chart
The process decision programm chart in this research is integrated with the stage of the fishbone diagram. Process decision programm chart helps companies to avoid unexpected factors and identify whether the solutions that have been formulated to be applied in the company. The process decision programme chart was obtained by conducting interviews and brainstorming with the quality control manager of the PT Santos Jaya Abadi warehouse construction project. They are six factor researcher found from fishbone diagram, and then to solve problem that found use process decision programm chart. The sic factors are material, machine, human, environment, method, and finance. The result of the analysis is the risk level value obtained from the questionnaire that has been obtained in the PT Sanros Jaya Abadi warehouse construction project area, with the assessment results obtained will be used to determine the level of risk of work on the structure under review. The results of the recapitulation of the questionnaire assessment of each work item that has been obtained are as follows:

Analysis Risk
The risk assessment came from a questionnaire that had been distributed to workers on the construction project. The structural works carried out were concreting, fixings, and casting. The risk level is derived from the likelihood assessment multiplied by the likelihood of impact. The risk level obtained will be used for the risk category for each job. In determining the risk analysis. the highest assessment is the column casting work with a risk level of 8.54 and is a moderate risk category. then for the floor plate pembekestingan has the lowest risk level of 4.88 with a low risk category.  Figure 10, it can be explained that the implementation of existing work on the PT Santos Jaya Abadi warehouse construction project shows that floor plate work has the lowest risk level with 6,43, floor plate work implements quality management properly and in accordance with specifications and work plans so that the effect of failure and deviation of quality control can be avoided. The results for columns and beams are in the medium risk category, although having a higher from floor plate risk category does not mean stating the results of the implementation of the work are not good but it will be even better so that its implementation can minimise the risk of failure or deviation in quality control. The value for column 7,42 and for beam 7,49. In determining whether the quality control carried out is successful or not based on the impact assessment. The floor plate casting work has the best percentage with a value of 85%, while the floor plate decking work has the lowest percentage of 63%.

DISCUSSION
Based on the results of the assessment through questionnaires that have been carried out on the PT Santos Jaya Abadi Surabaya warehouse construction project, the results of the analysis are obtained using the AS/NZS 4360 measurement scale. Overall the research results obtained from the analysis are as follows: Based on table 4, the implementation of column work has a risk level of 7.42 with a moderate category risk level. Then the implementation of the beam work is 7.49 with a medium category risk level. And the implementation of the Floor Plate work is 6.43 with a medium category risk level.  the results of the implementation of the work are not good but it would be better so that the implementation can minimise the risk of failure or deviation in quality control. If the implementation method used is not appropriate, it will affect the quality of work where the results of the work carried out must meet the specifications and criteria to be achieved. However, when making observations in the field, there are workers who underestimate the quality when doing casting work which results in reduced concrete strength.  Quality control of a construction project is one of the steps that can be used to control the risk of each job. Quality control is the shared responsibility of all workers in the construction project environment, The results of data processing based on the impact assessment of each job obtained from the questionnaire. Based on the assessment carried out, the casting work on the floor plate has the highest percentage, namely 85%, which is the result of the calculation of 4.27/5 so that the implementation of quality control is very effective because it is in the range of 81%-100%. Then the floor plate decking work has the lowest percentage of 63% which is the result from a calculation of 3.13/5. However, despite having the lowest percentage, the implementation of quality control is effective because it is in the range of 61%-80%. Then in table 4.51 is the implementation of overall quality control on column, beam, and floor plate work. In table 4.51, the implementation of quality control in the PT Santos Jaya Abadi warehouse project has a percentage of 74% because it is in the range of 61%-80%, so quality control is carried out effective. In carrying out quality control, it is necessary to supervise the quality by looking at various factors in the implementation of construction projects. One of them is the materials and equipment that will be used in construction projects need to be considered and in accordance with technical specifications. Management is a factor that affects the quality in the implementation of construction projects. So in the implementation of construction projects it is necessary to have quality management in materials and equipment as well as labour control by preparing efficient plans. The quality of the work on a project is influenced by the quality of the materials used

CONCLUSIONS AND RECOMMENDATIONS
Based on research conducted on quality control in the PT Santos Jaya Abadi Warehouse Construction Project, it is concluded that the implementation of the overall structural work process has been successfully directed, implemented, and controlled the entire series of activities optimally. Based on the assessment that has been carried out on the structural work of beams, columns, and floor plates. In beam work and column work has the same percentage of 76% in the effective category because it is in the value range of 61% -80%. The floor plate work has a percentage of 72% in the effective category because it is in the value range of 61% -80%. And in the PT Santos Jaya Abadi warehouse construction project for the highest risk level, it is