May 2003 Greenspace Insider, Cambria Land Trust

2
Volume 3, Number 5 May, 2003 The Insider A few months ago, a local resident questioned our two-year- old Strawberry Canyon Erosion Control and Sediment Reduction Project. The indi- vidual wrongly thought that the project was being done without a permit but would not discuss the issue with Greenspace. The one positive item that came out of this un- fortunate fracas was Greenspace learned that some materials used to construct the erosion structures contained chromated copper arsenate (CCA), chemicals used to preserve wood from termites, fungi, and other wood destroying organisms asso- ciated with eart h contact. Having been in the building business for many years it was not uncommon to use pressure treated wood for many aspects of construction. Using pressure treated wood to contain earth and capture sediment seemed prac- tical and made good sense and was call ed out for use in our approved plans. The same concerned individual complained that Greenspace was plac- ing arsenic in a creek. We took this accusation very seriously and have devoted this Greenspace Insider to CCA issues. What is CCA and where it is used? CCA is a water-borne preservative contai ning arsenic, chro- mium, and copper . It is used for the long-term protection of wood against attack by fungi, insects, and marine borers. The use of this product extends the productive life of wood and thereby reduces the demand for forest products. CCA products are intended for outdoor uses such as utility poles, fence posts, construction material, and pilings. Is there a risk that the CCA preservative can leak out of treated wood? Y es. Material treated with CCA and exposed to dampness or water for long periods of time will lose preservatives into the water or soil more so than rain on CCA treated fence posts. The amount and r ate at which arsenic leaches, how- ever, varies considerably based of factors such as climate, acidity of rain and soil, age of wood product, and how much preservative is in the wood. What risk does arsenic pose to human health? Arsenic is a known human carcinogen and is acutely toxic. When estimating the potential risks that a chemical may pose, consider two factors: toxicity and exposure. T oxicity is described as the harmful effects that the chemical may cause, which is often dependent on the amount or dose received. Exposure is the dose received, typically orally or through contact with the skin, or by inhaling, over a certain period of time. Therefore, whether any risk of toxic effects exists is dependent on both toxicity and exposure. Alternatives EPA has registered a number of preservatives that do not contain CCA’ s, and woods treated with these preservatives are available now in the marketplace . In ad- dition, untreated woods and non-wood al- ternatives, like plastics and composite ma- terials are available for purchase, too. If you have CCA material on your prop- erty or use CCA material, here are some recommendations: Never burn treated wood, wood scraps or sawdust. Seal existing CCA treated decks and play structures every 2 years with an oil-based sealant. Wash hands when using CCA prod- ucts or playing on structures made of CCA material. When cutting CCA material wear protective breathing masks. Do not prepare food on CCA treated surfaces. Do not use CCA wood on exposed indoor surfaces. Do not use CCA treated wood for wood chips or mulch. We have concluded that the small amount of pressure treated wood used in our erosion control project will have inconsequen- tial effects on the seasonal drain- age flow in Strawberry Canyon or the surrou nding forest. In the fu- ture, however, Greenspace will purchase material that does not contain any amounts of arsenic re- gardless of the current sentiments of the federal government to relax the arsenic standards in water- ways. Chromated Copper Arsenate and the Environment  Sources EPA, Minn, Dept. of Health The Greenspace erosion control structure will prevent further loss of soil in Strawberry Canyon Arsenic and Old Wood

Transcript of May 2003 Greenspace Insider, Cambria Land Trust

8/3/2019 May 2003 Greenspace Insider, Cambria Land Trust

http://slidepdf.com/reader/full/may-2003-greenspace-insider-cambria-land-trust 1/2

Volume 3, Number 5 May, 200

The Insider

A few months ago, a local resident questioned our two-year-old Strawberry Canyon Erosion Control and Sediment Reduction

Project. The indi-vidual wronglythought that the

project was beingdone without a permit

but would not discussthe issue with

Greenspace. Theone positive item that

came out of this un-fortunate fracas wasGreenspace learned

that some materials used to construct the erosion structurescontained chromated copper arsenate (CCA), chemicals used

to preserve wood from termites, fungi, andother wood destroying organisms asso-

ciated with earth contact. Having been inthe building business for many years it wasnot uncommon to use pressure treated

wood for many aspects of construction.Using pressure treated wood to contain

earth and capture sediment seemed prac-

tical and made good sense and was calledout for use in our approved plans.

The same concerned individualcomplained that Greenspace was plac-

ing arsenic in a creek. We took thisaccusation very seriously and have

devoted this Greenspace Insider to CCA issues.

What is CCA and where it is used?

CCA is a water-borne preservative containing arsenic, chro-mium, and copper. It is used for the long-term protection of

wood against attack by fungi, insects, and marine borers.The use of this product extends the productive life of wood

and thereby reduces the demand for forest products. CCAproducts are intended for outdoor uses such as utility poles,

fence posts, construction material, and pilings.

Is there a risk that the CCA preservative can leak out of

treated wood?Yes. Material treated with CCA and exposed to dampness

or water for long periods of time will lose preservatives intothe water or soil more so than rain on CCA treated fence

posts. The amount and rate at which arsenic leaches, how-ever, varies considerably based of factors such as climate,acidity of rain and soil, age of wood product, and how much

preservative is in the wood.

What risk does arsenic pose to human health?

Arsenic is a known human carcinogen and is acutely toxicWhen estimating the potential risks that a chemical may pose

consider two factors: toxicity and exposure. Toxicity is describedas the harmful effects that the chemical may cause, which is

often dependent on the amount or dose received. Exposure ithe dose received, typically orally or through contact with theskin, or by inhaling, over a certain period of time. Therefore

whether any risk of toxic effects exists is dependent on both

toxicity and exposure.

Alternatives

EPA has registered a number of preservatives that do nocontain CCA’s, and woods treated with these preservatives are

available now in the marketplace. In ad

dition, untreated woods and non-wood aternatives, like plastics and composite ma

terials are available for purchase, too.If you have CCA material on your prop

erty or use CCA material, here are somrecommendations:• Never burn treated wood, wood

scraps or sawdust.• Seal existing CCA treated decks and

play structures every 2 years with anoil-based sealant.

• Wash hands when using CCA products or playing on structures made of CCA

material. When cutting CCA material wear protectivbreathing masks.

• Do not prepare food on CCA treated surfaces.

• Do not use CCA wood on exposed indoor surfaces.• Do not use CCA treated wood for wood chips or mulch.

We have concluded that the small amount of pressure treatedwood used in our erosion control project will have inconsequen

tial effects on the seasonal drain-age flow in Strawberry Canyon orthe surrounding forest. In the fu-

ture, however, Greenspace willpurchase material that does not

contain any amounts of arsenic re-gardless of the current sentiments

of the federal government to relaxthe arsenic standards in water-ways.

Chromated Copper Arsenate and the Environment

  Sources EPA, Minn, Dept. of Health

The Greenspace erosion control structure will

prevent further loss of soil in Strawberry Canyon

Arsenic and Old Wood

8/3/2019 May 2003 Greenspace Insider, Cambria Land Trust

http://slidepdf.com/reader/full/may-2003-greenspace-insider-cambria-land-trust 2/2

Post Office Box 1505Cambria, California 93428

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   V  o l  u  n t  e  e  r  s   w i l l  b  e  g i  v  e  n t  r  a i  n i  n  g  b  e f  o  r  e t  h  e  e  v  e  n t  b  y  t  h  e    M  o  n  t  e  r  e  y   B  a  y

  S  a  n  c  t  u  a  r  y   C  i  t  i  z  e  n    M  o  n  i  t  o  r  i  n  g   N  e  t   w  o  r   k  a  n  d  a f  r  e  e t  e  e  s  h i  r t  o  n   S  n  a  p  s  h  o t

   D  a  y .   P l  e  a  s  e  c  o  n t  a  c t t  h  e   G  r  e  e  n  s  p  a  c  e  o f f i  c  e  a t  9  2  7  -  2  8  6  6 i f  y  o  u   w  o  u l  d l i  k  e t  o  b  e  p  a  r t  o f t  h i  s  e  x  c i t i  n  g  d  a  y !