 Okay. Thank you all for joining us today. I hope that if you're joining us from the eastern states in Australia that you and your loved ones are safe and well given the current circumstances. But for today, we'll be looking at a one on one on water quality sampling on mindsets and go through some of the key learnings that we've experienced and would like to share with you. So thanks for your time in joining us today. If this isn't your first hydrochloric webinar you may notice that I'm joined by familiar face Michelle Canton. It was our senior monitoring consultant based in Queensland. Michelle is a hydro geologist and has extensive field experience conducting a multiple hydro geological and environmental projects and is extremely confident with environmental field sampling on mindsets. Particularly with the ongoing continuous works that we conduct up in Queensland so thanks for joining me to talk about your experiences and learnings today Michelle. And for those who don't know my name is Kyle McLaren. I'm an environmental scientist and the technical sales manager at hydro terror. I work very closely with minds on equipment and technology selection and field data collection practices through my experiences on my side monitoring and sampling. And also in the background joined by Marcio who will be facilitating proceedings so thanks Marcio for making sure all hopefully goes goes well. So as you might be familiar with, we always enjoy at the end answering any questions you may have through this presentation so feel free to write in the Q&A box question and we'll go through them. At the end, if I could ask if you could please just write your questions in the actual Q&A box and not the chat also that will just help me consolidate everything and allow us to make sure we cover them all. So it's great to see that we always get some good interest on our field sampling when we're out and about here. But always we look to generate awareness and share our knowledge to ensure our clients are up to date with the latest in technology and methodology. We facilitate training to allow the appropriate adoption of these technologies and get real understanding of your industry needs to promote communication and ensure that we're meeting your monitoring needs in the future. So for today, Michelle will take the reins and talk us through the main considerations when sampling at mine sites both during and prior to conducting some field data collection approaches. And a lot of learnings from the field which we'd like to share with you all today so I'd like to now hand it over to Michelle to talk about these points. So thanks very much, Michelle. Thank you, Kaya. Thank you. Thank you everyone for coming in and joining us today. So I'd like to share a bit of my experience, as Kaya said, and a bit of what I talk about when I train our hydrothermal field technicians as well. Okay, so these are the least of the considerations. Let's start with health and safety. Inductions for specific areas, just really ensure that you've got inductions for everything or where the boards are located, because sometimes if you cross the road, it's not the same area and you need to do a new induction. Sometimes we need to do like five or six inductions to cover all monitoring points. Another thing that I always try to keep in mind, sparks, risks that are will define the equipment that we are going to use on the field. Okay. In a chat with the client, what is the concern, the contaminant or the indicator, and how these will be managed on site. So if there is something on site that indicates that that location is a higher potential of contaminant or not. As an example, I can show you on the right side. I have some readings from a bore. You can see the pH is really, really high conductivity. It's like if all readings are really different from a bore that we sample every day. The color of this water was brown, dark brown. And I got an incident there in this bore, specifically this bore in 2017 when the handle of the bucket was loose and a drop of water got in my boots. And what happened? This caustic water got through my boots and burned the top of my feet. But there was two hours later I was back to work. So be aware and inductions are really, really important. So you know what to do. In this case or in the case that you get any risk. Okay. Critical areas, access. So if you are not confident with how to drive on site or with big machineries around you, just ask for a squirt. They will be more than happy to provide you and to keep you safe. Okay, roads. On the roads, they always ask us to use the back roads as the monitoring points usually they are around the mining sites, dams and etc. And BLA also active town site. The active town site usually when you do a few walks, just be in mind that you are going to need to work on Saturday and Sunday where the active town site is less. And there are some critical points that you need, you will be only able to assess on Saturday or Sunday. Just chat with your client and align these prior you go inside. Okay. And also, the area that you are going to sample, if there is any potential of risk or there was any leaks or anything that changed the last time you spoke with the client. So you'll be aware and that you need to be more careful on those areas. Okay. Priority boards. Always the client wants to know, not always, but sometimes they want you to sample one board before others just to get results quicker, but also what is important to consider is if you know that that area or that monitoring point is high in contamination. Okay, it's really, really high level. Just leave that one for last. So even if it happens you cross contaminate, you don't cross contaminate during the day. So start with the less risk board to the most risk board. Okay. Look for the specific requirements for the program, including state's regulations. For example, quality issues in quality control, the frequency of duplicates, triplicates, if they are required, few blanks, if it's daily, once per round, or what they would like to. Triplanks and also ring states what they are required. Okay. Trigger limits. Sometimes you'll be asked while sampling or recording the readings to check on the trigger limits, the higher or lowest. And if this reaches the highest or is above or lower, you need to take some actions. For example, calibrate your water quality meter again, or recheck everything to make sure that that limit is above or below the trigger limit. Okay. Equipment calibration. It's a bit trickier, but I will show you why it's a state regulations they change. Hi, can you please next slide. Thank you. So in two examples that I bought here today, it's in Victoria, they say that you need to calibrate your equipment, according to the supplier. So what they say you should be doing. And you should use fresh solutions every time that you calibrate and keep an eye on pH and DO meters to calibrate every in every use. However, if we look at Queensland, next slide please, they say that you need to calibrate before each field trip and after the each field trip. So beginning of the day and end of the day. Okay, it's how we understand this. And the standards or the solutions you calibrate can be reused. So just be aware of where you are doing some sampling, how you are calibrating your equipment and keep these on hand or in your mind, the difference between them. Okay, next please. Now, let's talk a bit about how to choose the methodology and equipment, which one you're going to use for each case. Next please. So, always try forcing stick with the program requirements, but also you need to check the board condition, the structure, I mean, and the recharge. But you need to prioritize a few things as well that you're going to learn about it. Next. So what is the objective of when you are on site? It should follow the program and guidelines as much as possible with minimal water disturbance and considering the purging time with a fox on collecting the sample and completing the round. So what I mean about it, that's many of the time, you cannot follow the guideline, step by step, you need to be a little bit flexible and creative to get the sample as well. So water disturbance, what I mean about it, it's how you mix the water down the well or when you are going to do some sampling. So, in my view, we have the low flow method. It's the standard or what we should be using all the time when possible with an external perical pump, peristal pump, or a dedicated pneumatic pump. Okay, where you don't move much the water, you don't have a lot of influencing the water when sampling. Next please. So let's look for case one, it's the ideal bore, the bore that we would like to have every single time that we are on field. Next. So, more condition. There is like no obstructions, it's high to medium recharge. It's the little baby that we have there to take care of. So method that I always start with is low flow, which we should be aiming to use in all them. So, draw down that we would like to reach is 10 centimeters maximum. But we know that sometimes it's not practical to use to have these 10 centimeters only, which equipment we can use its external peristal pump, pneumatic pump could be Baylor or double valve pump as well. And then we're going to sample only when you, you reach the level in parameters stabilization. It's good to have three readings within the required variation. For example, pH you have a determinant variation 0.05. So, up or down, you have these three readings agreeing with that. Next one, please. We move it on the ideal bore to the water level, you start is trying to low flow and the water level, it's not stabilizing at all. What we do. Next place. We know now that this ball doesn't have a high recharge, it's a medium to low recharge. You can feel it when you are checking the water level and the recharge of the ball. Okay, so we, we change straight away to three times volume. So we know the drawdown is more than 10 centimeters when also when you can do it. Okay, so you push three times volume into three hours. Why I say this because time is money. Sometimes a bore to grab off three times volume, it's too much like 7080 90 liters, and you're going to take a lot of time so always online with your client, the expectations and the limit you can reach. Okay, the equipment that you can use for these could be any of them, but always thinking on the disturbance of the water as less as possible. Okay. You are going to sample after you have purchased three times volume or and after the parameters stabilization so and the last three liters, let's start you to read or less five readings just be aware of the water quality and see if it's a stable or not usually it is okay like 99%. A tip for you is when you are starting a low flow and then you see that the drawdown is more than 10 centimeters or it's not, you cannot stabilize the water level. Have on hand a constant for quick calculation or reference table as the one that I have on the right there. Okay. Just to be mind how much water you will need to purge with three times volume. If it's practical or not, and then it will help you to decide if you stick with three times volume or you try the third method. Okay. Next place. In this case, case three, you said, okay, let's do three times volume, but the ball doesn't have three times volume in it, so it gets dry before it also is practical for those balls that are really the column of water, it's too low. Next. So this we can say that is a medium to lower charge and three times volume could not be achieved. What do you do, purge the ball until it's completely dry. Okay, it can usually give, give it a limit up to two hours to do it because you have tried already low flow and then switch it to three times volume and then dry ball. So always think time and money. Okay, equipment, you can use any equipment, just be aware that with some pumps where the water gets in, it's not at the bottom of the pump so when you the pump cannot purge anymore water, you could have some water left in the ball, just use the bailout to grab everything out. Okay. When you're going to sample this ball that you have just dried, you wait until it is 9% recovery of the water level. Okay. But with a maximum of three days after purge dry, although otherwise you are going to have stagnant water again. Okay, even some balls you get the three days after and you see like 25% recovery. That's okay. Note and align with the client again and sample. Okay, it's important to sample. Next one, please. Case four, when we have a banpo or it is obstructed. Next. Prior to one is to collect the sample and finish the round because next three months you need to do all of again. So but always align decisions with client what they are happy for you to do. Okay, if the ball is partially obstructed, and you can reach the screen of the ball to purge this ball properly. You can use as the photo that we have per salt pump, which you drop just a tube in and it's easy and done. So the method will depend on the recharge as we discussed before. If it's totally obstructed, and you are lucky to have the water level below it. Okay. Below this obstruction. And also, depending on the recharge, you are going to use. Sorry, there is should be equipment and a method. Equipment, you can use any of them that will be suitable for this ball, but the method you need to check on the recharge. Okay, if you for example, you dry the ball and then come back three days after. You can use any water to sample. Just think about that. Okay, next, please. So, a few comments that I have seen in my life and I would like to bring to this webinar is sometimes you look at the records and the readings less than half leader. Readings and parameters stabilization. Um, what I would say is, you need to think about how, what is the recharge and the volume of the ball, the volume of the water that is in that ball. Okay, so always calculate how much water that ball has. So you are not sampling ensuring that you're not sampling stagnant water. You are sampling fresh water from the aquifer and the sample represents the aquifer. Okay, next, please. So I got an example for you, for example, this one, we could be sampling in the fifth reading, because you can see that the parameters are getting stable. And I'm meeting after per jinx, it's better to wait until you get six liter to have fresh water in. So in the end, we have 10 liters and gone stabilization as well. Next, Kyle, please. Another thing as a hydrogeologist as Kyle mentioned, I like to look at the readings and understand what is going on down there with the with an etc. So you having these in mind and with experience with time you will understand if it's time to sample or not. Here we have a ball that you can see pH oscillation and EC oscillation conductivity oscillation. So when I was looking at it and the data and the data was, oh my God, what is this oscillation for and then three and then up to four again. And I said no, no, that's enough. I have for just 20 liters. I think these four, if I'm not wrong. The volume was six or seven liters as well. So 10 liters, that's enough. Make the note that week I could not reach the stabilization of these two parameters and then I come back to the client and said, look, I couldn't get the stabilization on this. And I suspect something is happening there and I got the confirmation from the client say that there are different flow paths on that area. Okay, so just be aware communication with the client is the case. Next place. Another interesting one is the calibration. I have noted that not everyone or even the majority does do two point calibration. Okay, always the hundred percent but doesn't use the zero solution to calibrate the zero. Okay. So what we need to think about is, how is the deal readings on the site, how important it is for the program. If you have deal readings really, really low on the site. It's really important to have two point calibration. Okay, so otherwise you are not getting getting it created enough. So it's a few things that I had experienced and I have seen on my, my experience life, let's say, and I have pointed here. So, I think this is the end of the presentation buddy you have any questions please bring this in. And we will be happy to answer. Well, that's, yep, that was good. Yeah, I guess just a couple of points I suppose around the equipment selection selection aspect. Of course, as we know, you know the equipment that you're going to use for for your mindset monitoring is of course going to be, you know, site specific so it's really going to depend on the equipment but also it's going to depend on what you can use given the bore depths and locations that you're dealing with with those specific methodologies in mind. So, you know, we're always happy to help you and assist in that regard on, you know, what, what sort of mindset and challenges you're dealing with, as opposed to bore depths and that sort of thing, and sort of match up as best as we can around that sort of equipment selection for for the job. And just building upon what Michelle said also just around the, you know, the calibration perspectives. With the do being the example, you know, having having the single point to calibrations in the in the 100% saturation, we were saying, you know, a strong correlation between a couple of sites that the do readings that were coming out just from that one point calibration were, were higher than, you know, the same site and our do readings, getting those those two point calibrations happening with the 0%. So it's really important with your water quality meters and everything that you are selecting ranges that you would be likely to expect in that in those zones in those sites, especially with one, you know, two point calibrations are always better than three points are always better than two points. So as much coverage as you can get on the instrumentation itself. Whilst it does, you know, take a little bit more time at the end of the day we're looking for our accuracy of our readings. And that's the most, you know, important part at the end of the day. And also, you know, just be, you know, be aware, as Michelle said around those regulations in relation to your particular state and where you're doing that. You can see that there's quite a lot of fluctuation there in varying, you know, methods that Victoria or Queensland like to use. So just, you know, as again, just check that up and make sure that you're following those as best as possible. So we'll just move to if there's any questions available. If somebody asks, what frequency would you purge bores that are sampled weekly using the Baylor method to obtain samples. Michelle. Yes, thank you for the wrap up. Kyle. So if there is a first thing for me, okay, my understanding is, I use, I only use Baylor if there is not a other method of viable. So just chat with us Chris, if you can use any other method that you can stick with a low flow or even if you're a sampling weekly, perhaps a dedicated pump will be recommended for you. But the frequency depending on the method you can get on this ball but no more than 0.3 liters per minute, I would recommend more than this is not low flow, but if you can get 0.1 0.2 it will be ideal. Okay. Yep. Edward Rice just thanks Chris for that for that question. Edward Rice just said, what are your thoughts on the use of hydro sleeves in in no flow sampling. Look, the, the hydro sleeve way of things is something that's, you know, come up quite a lot recently and it's starting to build more traction through the use of hydro sleeves in those sense they do have their purpose. Sure. I have been looking at, you know, cross comparing, you know, some data and sort of doing my, my sort of due diligence on that regard for the hydro sleeves. But I guess at the end of the day, you know, they're less expensive method. And they, they get the job, they get the job done. But it's really dependent on your, on your sort of data quality, I suppose, when you take in factors of hydro sleeves for use of, you know, disturbance in the board depending on what method you're using to collect the sample if you're doing a rapid pull up of the hydro sleeves versus, you know, the isolation method to try and trap, you know, the water that you're collecting in that hydro sleeve in a specific zone. So you're still creating that sort of disturbance and mixing depending on if you're taking putting your hydro sleeve down versus if you're, you know, potentially leaving it there dedicated. Whether you're doing your isolation method, you might be, you know, using that disturbance method to get calm water into that zone of sampling anyway. So, you know, it's, it's sort of a more and more it's being recognized as a method to use. It's always going to be low flow when practicable, but I certainly see, you know, why people are selecting the hydro sleeves and before, you know, the cost and ease of use type thing. But I would, you know, I would probably, as I said, I'm very interested to look at data comparisons at same sites with hydro sleeves versus low flow method and see what sort of comes about with that. So if anybody here does have that has been doing a little bit of comparison themselves on that, I'd certainly be interested to hear that as well. But yeah, the hydro sleeves are a thing that's moving up more and more in this field. So yeah, thanks for the question there on that. Thanks for the anonymous attendee. It's a great presentation. Any equipment for remote monitoring. I'm guessing you might mean something that's going to be, you know, it's limited or something like that. If you, in that time, if you maybe elaborate, but I'll talk about, I'll talk about that. I certainly do have equipment for remote monitoring. If that's the case, you know, sometimes the challenges associated with sites that are very remote can be, you know, not only from an equipment provision perspective but also making sure that things, things work out there. So, in the case of, you know, instrumentation for, you know, level or anything like that. So we do have, you know, talented systems that work for sort of satellite and we have worked with a lot of mindsets around Australia and those remote areas to come to, you know, a solution for them with satellite or, you know, localized systems or some sites getting their actual, their own sort of 3G, 4G towers out there. But certainly there are ways to do that for remote sites and we have, yeah, plenty of experience in that regard for that. The remote monitoring is always a tricky one, but from a, you know, sampling kind of perspective as well, there is, you know, when the remote sites there, there can be quite deep, deep bores and challenging bores. And so, you know, if you're looking at actual equipment for sampling in remote monitoring, then maybe the use of a dedicated systems to leave the pump in situ there would be something you should consider because that sort of reduces our field time out there for that having pumps already installed in those sort of challenging bores. So hopefully that answers your question. Go Ryan. Thanks for joining us. Are you aware of any guidance on sampling of aquatards? I'm not too sure. Michelle, are you aware of any guidance on that in that aspect? No, I don't know about Australia. I know that back in Brazil we have many of them around bore construction and sampling method as you mentioned previously. So I'm not sure how many would like to sample a portion of the bore. But I can do a search and clarify these for you later, Ryan. Yeah, thanks Ryan. That'd be great if you could, Michelle. I'm also interested in that as well. So does the, so just elaborating on that question for the remote monitoring, you know, to have to be, doesn't have to be checked manually and syncs to a cloud server, etc. Yeah, that's, that's right. We have worked with quite a few mindsets around Oz where there's specificity in them, you know, needing to have their data and everything put forward to a particular system. You know, one I can think of is like a ecosystem where the data has to be uptake by your server. We can certainly push data in various formats to the mind of a particular server. But if that's not, even if that's not a requirement, then we can certainly host data through our own cloud based platform in data stream. So that's a pretty similar sort of login type, you know, cloud based server where we can view your data remotely through there and check on, you know, check on how things are going in sort of nice pretty graphs. There's certainly capability of hardware that can be, you know, installed remotely and and being back to either your particular servers or hosted by us. So feel free to contact me in the details there if you need to or wish to see anything else further on that but thank you for the questions. Yeah, one thing that I think it's important to add is about alarm scale for these. Yeah, that's right. So we can also, yeah, being the having not having to check manual thanks for that show. Having not been able to have to check manually there's also yeah the alarm sort of system that we can implement on our on our servers. You know, when there's an example being a battery battery life or voltages, we can sort of have exceeds or low levels, which can trigger alarms in that sense on a particular unit. So that's utilized in quite a few sites that we we oversee. So when we see low voltages in our batteries that sort of indication where you might need to do a site visit, if possible, to check that. So we, you know, quite proactive on that sense to ensure that no data is minimal data is lost in that regard if a unit goes down or something like that. Just checking through avenues here. If you have any other questions just play send them through otherwise we will be finishing. That's right. Yeah, so, yeah, if there was. Oh, hang on. Dan's got one for us here. Okay, good session. Dan Evans just says thanks thanks Dan for that. Good session. Would be great to have a similar surface water monitoring presentation can be even more crucial to get sampling right, given that these systems are often more dynamic and variable on both a spatial and temporal basis. Then ground what he adds good point then we certainly will certainly will take that on board and provide that through to our webinar series we have we have, you know, quite, quite a large, you know, just getting some good traction here on these webinars which is really great to see and we're really enjoying doing these presentations for everybody, you know, in the field. And so we'll take that on board for the surface water. So I totally agree. Yeah, it can be very crucial and we'll certainly do the surface water one that's for sure. Anonymous 10 days said possible presentation on will stick groundwater mapping. We do actually have a webinar that we've done with will stick in the past. And so you'd be able to to find that on our on our website under the webinar section we do record all these and sort of a few webinars back maybe six or seven. There was a will stick webinar session there so feel free to go and watch that recording on that one and hopefully that helps if you struggling to find that one please just send me an email and I'll point you in the right direction. Okay. So I think that covers everything there in regards to the questions thanks very much everybody for sending those those through. So yeah I hope you enjoyed today and thanks Michelle for joining me on this one and I hope you all enjoy the rest of your days and thank you very much for for joining us. We'll see you soon. Thank you so much, Kyle Marshall and everyone that has attended and bring up questions.