1The Environment Agency has produced a table that summarises the pertinent site factors associated with a cemetery development. Scores are assigned to the various factors and combined to derive a Vulnerability Rating. A graph is used to combine the Vulnerability Rating with the total number of burials anticipated in order to derive the degree of risk.
|
Groundwater Vulnerability Ranking Chart (Table 5.1 in P223) |
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|
Ranking |
Very Low |
Low |
Moderate |
High |
Very High |
|
Drift Type |
Clay |
Silt |
Silty Sand |
Sand / Gravel |
Absent |
|
Drift Thickness |
>5m |
>3 – 5m |
3m |
0 – 3m |
Absent |
|
Flow Mechanism |
Intergranular |
|
|
|
Fissured |
|
Aquifer |
Non-aquifer |
|
Minor aquifer |
|
Major aquifer |
|
Abstraction and Source Protection Zone |
Outside Zone lll |
Within Zone lll |
Close to boundary of Zones ll and lll |
Within Zone ll |
Within Zone l or >250m from private source |
|
Watercources and springs |
>100m |
>70m <100m |
>50m <70m |
>30m <50m |
<30m |
|
Drains |
>100m |
>40m <100m |
30m – 40m |
>10m <30m |
<10m |
