tv [untitled] November 3, 2011 12:00pm-12:30pm PDT
>> please continue. >> ok. we are in the proposed plan, if you have the slides in front of you, i am on slide 3. the clean up process starts with the preliminary assessment and then the investigation phase for the site and then we go into the proposed plan public comment period. that is where we are now. september 7-november 21. i am here today to talk on behalf of the navy how the navy is proposing to remediate or clean up parcel e-2. to reiterate i have brought comment cards for the public so they can submit public comments. we do require written comments and they need to be postmarked by the 5th of november.
what happens after the comment period, the document will tell what -- how we have decided to remediate the site and we will design it and monitor the site after we are done. but i will go into that a little more. where is parcel e-2? you will see that it is the southwern part of the shipyard including 48 acres of shoreline and lowland coastal area. ok. the history. e-2 was created between the early 1940's and late 1960's by filling in with various materials including soil, crushed bedrock, saidments, construction debris and trash and waste. i have a series of photos that show the progression of how
this land was created. so you will see in this photo, you can see the 1935 shoreline at the top and what is most of now e-2 was bay. it was filled land. if you follow along to 155 it is more filled in. 1965, even more filled in. 1969, you can see all that is left that is not land is the drainage channel. and 1974 is pretty much how it looks today. it was bay. it was filled in with soil and the middle area you can see the green outline is the landfill boundary. >> you went through quickly what e- is contaminated with. i know there are a number of parcels that had heavy metals and other wastes.
can you go over in more detail what is in e-2 in particular and what is not? >> right. pretty much all of the above because it is a landfill. i will go into that farther in a later slide. maybe if i do not answer your questions later, i will come back to that. i think that it is better that we go on and i address that with a later slide. >> just so you get to that. >> absolutely. slide 11. what do we know about parcel e-2? this is a photo of investigation that we have been doing. we have done a lot of investigations, numerous soil, trenches, you dig into the landfill to see the wastes and debris that we have. we have done groundwater monitoring samples.
you can collect water samples from those. we do continual soil sampling because the landfill generates landfill gases like methane. we started in 1988-2008. decades of work and numerous samples have been collected. like you were asking me before, the types of things that we have seen are -- we have heavy metals. you have some areas -- this is the good one. let me describe the environmental samples a little more. if you see the trenches -- here we go. the little dots with the line through them on here are trenches that were dug to find
where the extent of the landfill is. we have other types of samples. we saw a lot of contamination. >> please say what a pcb is. >> they are associated with things like transformers. you might remember they were in pole mounted transformers. an oily substance, helps things from being overheated. that was a big contaminant in this area. up in here there was lead contamination.
we found similar contaminants within the landfill, petroleum, things of that nature. but the hot spots we have found have been along the edges of the landfill. we have done numerous groundwater samples. it shows that it is relatively clean and we do not have a lot of contamination. i should point out that groundwater flows from the northwest, so the top of that picture down towards the bay. so we did a numerous groundwater samples back in 2007.
if there was a lot of contamination, we would have seen it. those samples were nowhere near the bay. they were way more inland. groundwater is a really good story. we don't see very much coming out of the landfill. does that answer your questions? let's move on to slide 14. you remember those trenches? this is a picture of what we are seeing in the landfill. you can see that it is construction debris, that nature of stuff from the former
base of activities. >> if you can talk about what the health and human impacts are. what is the impact of lead on children. if you give us a sense of the materials that are cleaned up. >> i am not a risk assessor. this might be a question that i would definitely get back to you on later this week. >> my understanding is pcb could cause cancer. >> yes. some of the contaminants we find could cause cancer. that is absolutely right.
some target oregons, some target developing fetuses. i have to point out that we have done expensive risk assessment for human health and e. coli logical receptors and our preferred remedy is -- i shouldn't say more than adequate. very conservative. we are going above and beyond in how conservative we are being to be protective of those . the critters in the bay, the wildlife and future site users. it is going to be a park. there will be people or kids playing on it. so, when we are done cleaning up, we will absolutely be safe for those future site users.
the third type of waste, the thing that is probably the most concerning is the industrial waste. paint sludge, solvants. waste oils like petroleum products and our pcb's that we have so much of. that is not all of the waste. probably most of the waste is construction debris and material that is in the landfill. early clean up actions. i wanted to talk about the early actionings we have taken to clean up the more contaminated areas. in 2007 we cleared up an area
where melted metal was thrown on the shore line over 8,000 cubic yards of debris and took away that risk. we started what we call the pcb hot spot area, digging over 40,000 cubic yards of soil. we got drums out and pcb contaminated material and were actually ongoing project started up again in 2009 where we are digging out an additional 40,000 cubic yards of pcb contaminated material and the soil has some of that lead, copper, other heavy metals that could mostly be contaminants for the ecological
receptors. we are digging all of that out up to 15 feet in some areas. and up here, more inland, adjaceant to the landfill, the area we had where batteries were disposed of or got stored there. you might know lead is oftentimes associated with batteries. we are digging in this area for lead. we also have solveants in this area that we are currently digging out. these are what we call the hot spot areas we are doing early clean up on. i don't want to belabor this. another thing i want to mention is that i told you about the landfill gas we are addressing. we monitor the gas coming off of the landfill monthly.
we installed pipes and a collection system. this is a normal thing. all landfills create gas because material is decomposing and methane is created. we do that monthly. those results are sent to the regulatory agents. >> question about the methane you collect and then test. are the results published publically? >> yes. absolutely. >> what do you do once you tested them? >> we collect samples to make sure that we are not exceeding regulatory levels on the off chance that we have one or two locations where we actually exceed and we vent that gas. having it build up is what is
dangerous. we vent it. >> it goes out into the atmosphere. >> yes. i should point out that this is an interim remedy and the final one we will design with more engineering controls. but currently, yes. it is probably only three times per year we have to vent that. >> can you describe to me what the effects are with human exposeure to methane? >> nobody is really getting exposed to that. the effects are that it could catch fire and is combustible. that is why you do not want it to build up. we are preventing that, absolutely. and those results are published in a quarterly report that is put in the information repository that is open to the public. >> ok.
>> so, let's move on. this is just a before picture. you can see a lot of debris along the shoreline. this is the bay out here. we have done a lot of pretty significant clean up along the edge of the shoreline. evidence of remedial alternative. they looked at a host of alternatives from doing absolutely nothing to leaving the landfill in place to everything. in the end we landed on a hybrid approach that includes containment of the landfill we have gotten a head start on a lot of the hot spots.
we should point out that the navy is required to follow federal criteria. you should know that one and two, they are go and no-go. we are protective or we aren't. we are in compliance or we don't go. first off we are protective of human health and the environment and compliant with all regulations. -7 are what we call balancing criteria. they just help us get the best balance for whatever our preferred alternative ends up being. and eight and nine is where we are all right now.
community acceptance is the public comment period that closes november 1st. the knave serequired to evaluate all of the comments and to look at them in relation to all other comments we receive and in the end make the best decision for cleaning up or remediating parcel e-2. what is the preferred alternative? excavate and dispose of soil hot spot areas. install underground barriers to limit contaminated groundwater.
and i am going to show pictures that you will get a visual of what some of the stuff looks like. remove and treat landfill gas. build a rockwall. build new wetlands. so we will have some natural shore line areas. monitor and maintain and monitor and maintain the areas open space. i mentioned before that this is supposed to be a park and open space. when we are all done we have to monitor and maintain it. along with this goes with institutional controls, a fancy name for land use controls, meaning people will not be allowed to dig or install a well and drink the groundwater. there will be limitations. this is a picture of the soil cover that we installed on another portion of the
shipyard. all right. really quickly, these are a lot of the hot spots we have already dug and a few new ones up here in this area. they are all hot spots that will be excavated or moved off the base. this is an overall view. you can see the landfill gas extraction wells that are proposed. this is what is proposed. our fresh water wetlands. we have, i think it is 1. over an acre of fresh water wetlands we are proposing. we have tidal wetlands. you will design ours to meet up thru for a very large wet land area.
here is the picture of what it looks like today. candlestick is right here. the point of the picture is to show you what it looks like today is similar to what it looks like in the future. vegetated, maintained open space. just really quickly it is just to illustrate the debris. the landfill. up to 5 feet. two feet of soil replaced in 1974 when the navy closed the landfill. they put out two feet. another two feet was placed in 2000.
we have material that's been testeded and cleaned and safe for reuse. i have to point out that is a minimum of two feet. in many places it will be much, much deeper. >> it looks like the contaminated landfill waste is at least six feet below the ground surface. >> yeah. >> how thick is the liner material? >> the liner material is a couple of inches thick. it is called hdpe. >> it is made of high density plastic? >> yes. high density plastic. the bottom is a solid. then it will have a drainage layer so that water will come down through the soil cover
into your hdpe and drain off and get collected and diverted into the appropriate place. >> what happens if there is seismic activity? >> that is a good question. it is designed for that. we absolutely design our remedy for earthquakes. i looked at a study that we did and they looked at an earthquake up to 7.9, 1 kilometers away. they expected how much the ground could move. i think up to five feet and some settlement. this is all stuff that can easily be engineered into the cover so that it is very protective. you have to remember that the navy does not walk away. there will be what is called operation and maintenance. they will be out doing probably at first monthly and maybe
quarterly inspections and then yearly inspections to make sure the remedy is operating properly and successfully. and then in the case of seismic activity like if there is an earthquake over a certain magnitude there will be requirements for immediate inspections after earthquakes. it is a clay mixture. a thick, wet clay that is put verticly so you have an excavator dig a trench. you can see here. here is our landfill. here is the trench. it is dug down below or to the bottom of the waste and it is filled with this material.
this is mixed with a sand mixture. it does not prevent the groundwater but it slows it down. ok. and here are some other pictures, when i say rockwall or shore line you will see that it is big bolders. this is actually a picture of another section of the shipyard that we finished earlier this year. and then the wetlands. this is a picture of wetlands in the east bay. you know, this is the type of site -- you know this is what it could look like in the future after we build our wetlands. ok. why is this the preferred alternative. the navy feels because this landfill can be contained very safely, the landfill is very similar to other closed military landfills around the bay. this is not the first time that it has been done. we have things people are
concerned about. radio active waste. the nature of what we have can be safely managed and placed. they were painted with radium paint so they glowed in the dark and were put on submarines or ships. that is the type of low level radioactive waste that we have. thirdly the groundwater, like i was telling you, does not pose a major risk. closure and place is consistent with e.p.a. policy. there is an e.p.a. policy that says landfills of this nature and of this size for 2 acres can be easily closed in place.
ok. so, why was the preferred alternative identified instead of full excavation. i am sure everybody is wondering that. leaving it in place or closing it properly in place reduces the short-term risks sooner. would remove the soil hot spots that prevent the most risk. the areas with the biggest potential to impact people or wildlife, we are taking them out. they are not staying behind. we will safely contain the landfill with proven technology. landfills are closed all the time with this technology. it will prevent fewer short-term risks to workers and the local community. another thing i should point out is that digging up the landfill would result in numerous years of hauling
contaminated materials through the community. it would be noisy and smelly and a lot of traffic. what are the next steps? after the public comments are received on november 21st the navy will look at all of the comments and take them into account and respond to them in what is called a responsiveness summary. that is a written response and our document called the record of decision. it is the document that will select the final remedy. we will design and build starting in 2013. if anybody wants to provide comments they need to provide written comments at this address. his information is on that comment card that i brought.
here are our regulators that the supervisor mentioned. this is just their contact information. they will speak to you after this. and if you want additional information or if anybody would like to get additional information on supporting documents or about liquid faction study, that is all in the information repository. these are the locations for those. a lot of the information can also be found on the navy's website. >> thank you. >> good afternoon supervisors. i am an environmental engineer
with the san francisco health department. as you are aware i have been working on this project for the past 18 years. i have been reviewing with the assistance of the scientists and the engineers of our consultants the information that the navy has just presented as well as the data and analysis for other areas of the shipyard. i wanted to remind everyone that the navy and regulatory agencies that oversee the navy's work determined parcel a, the parcel that's already been transferred and is under development since 2005, under the oversite of my department it was determined safe to do that, including the fact that it is adjacent to this area. the navy and the regulatory agencies determined that all of the other parcels the navy still owns are safe
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