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Zhou Weishun left the people from the construction project safety supervision department at the scene, and left Li Gong and Chen Gong behind, and Zhang Tongxun seemed to understand that Zhou Weishun wanted to leave him the space for investigation. Slowly, he also understood Zhou Weishun's thoughts, but he sneered slightly in his heart, saying that Zhou Weishun seemed fair, but in fact, he hoped that Zhang Tongxun would not startle the snake, and it was best to defeat Zhao Yida, who was already the number one and had enough votes on the Standing Committee, after mastering enough evidence.

However, this can at least give justice to those who died, Zhang Tongxun will not be so ignorant, the battle between Zhou Weishun and Zhao Yida has been going on for a long time, but Zhang Tongxun is just doing things in line with the principle of an ordinary official, he doesn't want to lean towards either side, as long as no one affects his judicial reading surname.

Shi Weixian has already greeted the man and woman, as the deputy mayor in charge of municipal construction, and the construction project safety supervision department will naturally not be less dealing, although not particularly familiar with these two, but more or less have met a few times.

Zhang Tongxun looked at it, but pulled Shi Lei aside: "Boy, you have already intervened in this matter, and now you have to help me keep asking." I'm a big guy, and I don't know anything about architecture, especially septic tanks or anything like that. Today you are responsible for helping me get to the bottom of it. When the water comes out, I will ask the Public Security Bureau to send a pennant to your family. ”

Shi Lei smiled helplessly, it seemed that Zhang Tongxun was relying on him. However, he was also willing.

In that life, he and Zhang Yisong did not meet in the first few years, and Zhang Tongxun naturally had little contact with him. But later, after he met Zhang Yisong and was recognized by him, Zhang Tongxun also took some care of Shi Lei. It seems that Zhang Tongxun also knows the unjust case of Shi Weixian in that life, but because of the rules in the officialdom, and he does not have any objects worthy of too much suspicion (unlike Shi Lei who is constantly helping in this life), it is impossible for him to help Shi Weixian overturn the case. Even if it is for Zhang Tongxun's later care of Shi Lei, not to mention that Zhang Yisong completely regards him as a brother of a compatriot, Shi Lei cannot refuse. What's more, he also wants to investigate this matter clearly.

In the whole development process of the accident, Shi Lei has a clear clue in his heart, but what kind of support points can be dug up behind the Bibo building, Shi Lei can only figure it out through step-by-step means. Of course, Shi Lei has such strength, in fact, he should be a middle-aged man who is close to forty years old and has experienced the ups and downs of life that most of the people present have never experienced. At least mentally.

"Let's let Xiao Lei ask." Zhang Tongxun whispered to Shi Weixian.

Shi Weixian hesitated slightly, and seemed to feel that Shi Lei really knew more about many details here than himself, so he nodded in agreement.

Naturally, the two people from the construction project safety supervision department were a little puzzled, and they did not understand why it was the turn of a teenager to interrogate them, which in their eyes was undoubted.

Shi Lei was not stunned at all, with the expression of an old god, which seemed somewhat incredible in the eyes of others, but in Shi Lei's heart, this was the truest self. A person who is in constant contact with the Vice Premier of the State Council and the head of the Organization Department of the CPC Central Committee is naturally nothing to be fazed by when encountering these small characters, even if they look much older than him.

"On behalf of Director Zhang, I would like to ask you a few questions." Shi Lei paused slightly, gave the two of them enough time to look at Zhang Tongxun for advice, and then said: "I won't say much about the situation at the scene, you all know it, and you also know that this accident involves several lives, and the size of this responsibility must be much clearer than me, a high school student who has just graduated." As for the septic tank in the neighborhood that was filled in thirteen years ago, I wonder what the condition was when the two of you first monitored it. In short, if the methane gas in the septic tank leaks to the side of the bomb shelter, is concentrated enough to cause an explosion? Of course, this is in the event of an open flame during construction. ”

The two of them still seemed to be a little difficult to adapt to a child's serious interrogation of themselves, but the older man had already heard enough professionalism from Shi Lei's questioning, and he was a little surprised that Shi Lei could know so much about this knowledge.

After a deep groan, the woman turned her gaze to the man, naturally hoping that he would speak.

"My surname is Wu, and I am in charge of the safety monitoring of the project together with Xiaoyanagi. At the beginning, the report submitted by Bibo Construction took into account the existence of septic tanks. We were present and supervised the whole process when they conducted the test, and we also tested the final samples and found that the amount of biogas contained in the septic tank exceeded the standard. ”

Shi Lei nodded: "I believe that the two of you know better than me that the biogas meets the explosion standard, and it is possible to produce an explosion ...... more than 8.6%."

The man surnamed Wu interrupted Shi Lei's words: "To be exact, it is between 8.6% and 20.8%, and if it exceeds 21%, insufficient oxygen content will not cause an explosion." ”

"I can't compare the expertise to the two of you, but that's not the point. I would like to know, how do your monitoring determine that the biogas in the septic tank does not pose an explosive hazard to the bomb shelter? ”

The man surnamed Wu seemed to find that he still underestimated Shi Lei, and couldn't help but groan, his chin pursed slightly: "The situation is not what you imagined, it is impossible for us to calculate the volume of biogas in the entire septic tank and compare it with the volume of the air-raid shelter, and there are too many uncertain factors in this." This is not how engineering safety monitoring is carried out. The reason why we believe that biogas does not meet the explosion standard is that after testing, the methane content of the biogas contained in this septic tank is less than 30%, and you only need junior high school chemistry knowledge to know that biogas is used as gas, and its methane content is at least higher than 50%. According to our tests, the biogas produced in the septic tank here has a high content of hydrogen sulfide, about 5% to 8%, which will smell more pungent than ordinary biogas. I also learned about the situation before, and I heard that someone smelled the smell of biogas, of course, this is easy to confuse with the smell of coal gas, that is, liquefied petroleum gas. I think it should be more for this reason. ”

The man surnamed Wu in front of him seemed very calm, and Shi Lei couldn't see the symptoms of what he was trying to hide. However, thinking about his words carefully, Shi Lei vaguely grasped an ominous place in his words.

"Uncle Wu, I noticed that what you just said was 'we were present when the test was conducted', I wonder if the exact meaning of this sentence means that you were not present that day?"

The man surnamed Wu was slightly stunned, and then admitted calmly: "My little grandson was sick that day, and I took him to the hospital to hang water." But Koyanagi has always been there. ”

Shi Lei smiled, knowing that he had found the key to the problem, and immediately turned to look at the woman surnamed Liu: "Sister Liu, since Uncle Wu was not present that day, then I have to ask you the next question." Do you supervise the whole process when the quality control engineer of BIBO Construction extracts the biogas from the septic tank and can be sure that they do not have any irregularities? ”

Obviously, this question was a little unexpected, the woman surnamed Liu seemed to be only assisting the man surnamed Wu in the monitoring work, probably she didn't expect Shi Lei to know about the absence of the man surnamed Wu that day so quickly.

What's more, it was the question itself that stumped the woman surnamed Liu, and it seemed that she didn't know how to answer for a while.

Shi Lei waited for a while, then smiled and said, "Is this question difficult to answer?" In fact, you only need to supervise according to the protocol, and you can easily know whether the other party is doing anything in the samples taken. But it doesn't matter, or let me put me another way, the sample you took that day contained less than 30% methane and more than 5% hydrogen sulfide, which means that at least more than 60% of the content was other gases. Can I ask Sister Liu, what kind of gases are they? Suffice it to describe it in general. ”

The woman's demeanor was a little more relaxed, probably she felt that this problem was not harmful, and after recalling it for a while, she replied: "There are about 20% nitrogen, less than 10% oxygen, and about 20% carbon dioxide...... I don't remember the exact number, but it was about the same. ”

Shi Lei nodded again, already confident.

Looking at the man surnamed Wu again, Shi Lei said: "Uncle Wu, I know that the carbon dioxide content in biogas is usually between 20% and 40%, and if you remove the carbon dioxide from the 60% gas after methane and hydrogen sulfide, you will probably find something." ”

The man surnamed Wu made a simple calculation, and was suddenly shocked: "The air is ......" His lips spurted, and he slowly spit out these two words.

"The content of nitrogen in the air is usually less than eighty percent, oxygen is about twenty percent, and other gases add up to less than 2 percent, and the data given by Sister Liu seems to be extremely similar to the content of various gases in the air. So back to the first question, Sister Liu, if you continue to hide it, you may be set on fire, and the biogas explosion is not a joke. Shi Lei took a step forward, his eyes staring at the woman surnamed Liu, his expression was extremely grim, and his tone became more and more serious, almost word by word, "When Bibo Construction was collecting samples, did you supervise the whole process to ensure that there were no irregularities in the process of their sample collection!?" ”

In front of Shi Lei's powerful momentum, the woman surnamed Liu's face turned pale instantly, and she took two steps back, even if she was half a meter away, Shi Lei seemed to be able to hear the sound of the woman's heart beating violently under the woman's towering and full chest.

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Give it over, ask for a ticket!

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