Laserfiche WebLink
3 <br /> How Much Lead Makes a • Land USe:dcmm or use hchildren. <br /> Dust Hazard? Areas that will be used frequently <br /> Until EFA completes work on regulatory by children are of greater concernsince any lead in the soil may be <br /> standards for lead levels in dust, the picked up by the children. For <br /> Agency recommends the use of the that reason the acceptable levels >l� <br /> following"clearance levels"(levels used ' <br /> to establish when a surface area is clean of lead yr child-frequented areas <br /> (like yards and playgrounds etc.) <br /> for identifying dust hazards in key 5, <br /> surfaces in the home. Use these levels in are lower than in areas that are <br /> ��"-� • � •'� <br /> identifying lead-based paint hazards and closed off to children. <br /> sources of lead exposure and determining ' Soil lead concentratiolz, <br /> the need for control actions. The higher the aoncelutration of lead in the <br /> + Uncarpeted floors: 100 uglft-(0,93 bare soil, the greater the expogure risk. <br /> mg/m2) Decision-makers should consider both soil <br /> • Interior window sills: 500,ag/ft2(465 <br /> win <br /> ccntration and laud-use plans when <br /> Mg/M2) determining what,if any, hazard control <br /> • Window wells: 8001cg/ft2(745 mg/,-n2) determining <br /> is necessary in a residential area. <br /> ("gav-micrograms per square foot is a measure of <br /> the mass of lead per squ=foot of surfa=).These Hazard control options for lead-contaminated <br /> samples are equally analyzed by s lab and collmted soi I include both interim control measures <br /> by an inspector using vacuum or dust wipes. and soil abatement strotegje_,,. Interim <br /> controls generally establish an exposure <br /> Lead-Contaminated Bare Soil barrier between bare soil and children (i,e, <br /> shrubs, grass, crushed stone, hardwood <br /> Lead-contaminated exterior bare soil is a mulch, or relocating play areas), Soil <br /> concern both as a direct source of exposure abatement Strategies either remove/replace <br /> through hand-to-mouth activiiy and as a contaminated soil or establish permanent <br /> contributor to indoor dust lead levels when barriers(e.g. cement paving, permanent <br /> tracked into a home. Comn,non sources of brick)between the soil and the residents. <br /> lead in residential soil include deteriorating <br /> exterior lead-based paint from houses and <br /> past use of leaded gasoline deposited onto the How Much Lead Makes a Soil Hazard?' <br /> soil surface. Industrial sources such as Soil lead cancenlration below 4,90 parts per <br /> smelters,recycling facilities, and mining million(ppm); <br /> activities can also cause soil contamination in • If tests indicate that the lead concentration in <br /> residential areas, the soil is below 400 ppin,site-spccific <br /> action is usually not nccessarv. <br /> EPA has identified two criteria For 5Oil lead concentrations of400-5000 PPM <br /> determining if hazardous levels of lead are • If the arra wall be used frequenny by <br /> Present in bare residential soil. These factors children,EPA recommends interim centrals <br /> include: to reduce contact between children and <br /> contaminated soil for]cad concentrations as <br /> low as 400 ppm, <br /> (e(1ntiMXd on next page) <br />