concept EIA-rapport - Staatsolie

SRK Consulting: Project No: 439414 Staatsolie Pipeline EIA – Draft EIA Report Page 23
• Short rainy season – early December until early February;
• Short dry season – early February until mid-April;
• Long rainy season – mid-April until mid-August; and
• Long dry season – mid-August until early December.
Average monthly rainfall varies from more than 300 mm in the long rainy season to around
100 mm in the long dry season. Rainfall intensity is greatest in the long rainy season, when
intensities of up to 70 mm/hour are recorded over short periods of up to 15 minutes. Greater
intensities have been reported but with longer return periods.
The monthly average rainfall recorded in 2006 and 2007 at the Johan Adolf Pengel
International Airport meteorological station, located at Zanderij about 35km south of the
refinery site, is presented in Table 4-1 below.
Table 4-1: Mean monthly rainfall for Zanderij in 2006 and 2007
Average rainfall
(mm)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
509 205 281 203 552 615
Source: Airshed Planning Professionals (2009)
REUT/DALC 439414_StaatsoliePipelineEIA_Draft EIA Report_Final
-
285 161 160 258 496
Temperatures generally vary between 23ºC and 31ºC with a mean daily temperature of
approximately 27ºC (Webster & Roebuck, 2001). January is the coldest and September the
warmest months. Monthly average, maximum and minimum temperatures recorded in 2006
and 2007 at Zanderij are shown in Table 4-2 below.
Table 4-2: Temperatures for Zanderij in 2006 and 2007
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 31.8 32.2 33 31.3 33 32.7 32.5 33.7 34.4 35 33.9 32.6
Minimum 21.2 18.8 19.8 21.9 21.8 22 22.4 21.2 14.1 22 20.9 21.2
Mean 25.5 25.6 25.9 26 25.9 25.7 25.5 26.7 26.9 27.3 26.4 25.6
Source: Airshed Planning Professionals (2009).
Humidity is generally high throughout the year, varying between 80% and 90% on the Coastal
Plain and 75% in the Interior (Alcoa & CNEC, 2005). The highest humidity values are recorded
from May to July and the lowest from September to November. Monthly average relative
humidity recorded at Zanderij between January 2006 and December 2007 varied slightly
between 82% and 88%.
Suriname does not experience hurricanes like the rest of the Caribbean region, but powerful
winds do blow during strong storms. Wind data for 2006 and 2007 measured at Zanderij
shows that northerly, north-easterly and easterly winds dominated during this period, with a
high occurrence of calm conditions (50.2%).
The dominant wind direction during the day is easterly, with north-easterly winds dominating at
night. Calm conditions are more frequent at night (54.2%) than during the day (46.2%).
Seasonal wind patterns show an increase in the occurrence of high wind speeds in the
months March – May, and to a lesser extent in the months December – February. In the
months June – August, there was an increase in calm conditions and south-easterly winds.
There are a number of sources of gaseous emissions in the study area. These include the
existing Staatsolie refinery, the SPCS power plant on the Staatsolie refinery site, the SOL,
OGANE and Suritex facilities along the Suriname River as well as the various other industrial
enterprises in the area, such as the ice factory, fish factory, cement factory etc.
June 2012