# e 1111.1"" '''" It ••• '.tl' If 

## [COLOG' 

# Focus
Site Hazard 

# Assessment

The Department ofEcology is in 

### the process of

### ranking 

### IIIofWashingtoa-. S80 known or suspected hazardous waste sites as required by 

### the Model Toxies COotroi 

### Ad. However, before these sites can be accunlely 

### ranked lbey 

### mustundergo aD environmental data collection process. 

### This process. 

### bawD IS I 

### site hazard asst:ssmCUI, helps Ecology determine the type and 

### extent of

### commination It I site. 

### Assessing the Potential Hazard

.**..'~** : , ....**,.~** ....... i·-:; ,; -.,. -.J.**~.~** A site hazard assessment is an early study 

### to provide preliminary 

### data 

### repnJiDg 

### the

. relative potential hazard 

### of a site. The main purpose 

### ofI 

### lite 

### hazard aSSCISdllt1lt 

### iato provide sufficient sampling data 

### and 

### other informatioa to: ..

.. . ,...

• Confirm or rule out contaminatx. ::**~I.'<~~~ (~-**  j:=J:..**.~'** ..' t··

• Identify the hazardous substancc(s)

• Identify

# en~ro~~'ntal**cb~'ra'd~cS ~iated"wUii~~** **~~~:~.~ $:.~** **~H~i'~:.:~** '4Kii ,......**-:~j**

• Evaluate the potential for the thn:2t 

### to human health and the environmeat 

### It is important to note that a hazard MSC'SSment is notintended to 

### bea 

### detailed site study or assessment ofthe health risk 

### posed by 

### a site. ' . 

### Is 

### a Site Hazard Assessment Always Necessarl' .' . ":. : .: s-,- .'

Yes. A hazard assessment is necessalJ even if environmental data is 

### already available for the site. This helps ensure that all 

### data elements are accounted 

### forprior

### to saxing 

### aDd ranking a site. ECology encourages siIe owners to submit any relevant enviroomental studies oftheir site. This will help Ecology in scoring and ranking 

### the 

### site as accurately as possible.

. 

### What Must Be Included To Accurately Assess a Site?



## 7. Any odJeI' 

### bctors which 

### mal be 

### significant 

### ia estImating 

### the exposure 

### to sensitive environments. to ground water and distance 

### to nearby wells. bodies of

### sudxe water aDd

. drinking waIa' supplies.



## 6. An evaluation of

### human population, food 

### aops,
. 

### recreatioe sensitive environments. irrigated 

### areas andaquatic resources. 

### 4. Coosideration ofsurface waterrun-on and 

### nm-off and the possibility of

### cootamioants seeping 

### througb the surface and contaminating 

### pound water. 

### S. OAracterization 

### of sub-surface and 

### ground water, including 

### the depcb 

### 3. A description of the facilities containing the substaDces and their condition. 

### 2. Identification ofthe hazardous substances and their location, including 

### what was or may 

### be released and, if applicable, 

### what products 

### ofdecomposition, recombination or chemical reaction are currently present at the site. Although a site hazard assessment is DOt intended to 

### be a detailed site characterizatioa, it includes sampling results from various locations on aDd around the site, site observations. maps and other information needed to score and rank the site. Specifically, a site hazard assessment should include: 

### 1. Evidence confirming a release or threatened release ofa hazardous substance.

October 1990 . \.

. 

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