HISTORY ON COLLAROY BEACH (point A)
http://gse.mq.edu.au/docs/gse811/CaseStudy_CNCoastlineHazardLines.pdf





- Long history of storm damage and coastal erosion
- Most highly capitalised beachfront on NSW
- Nationally- 3rd area most at risk from coastal processes
- Storms that caused considerable damage 1920's, 40's 60's 70's 
- The problemstemsfromthe fact thattheinitial sub-division wastooclosetothe beachwith propertiesextendingintothe active beach zone.” (Nielsen Lord Associ ates,1988).
- Early actions to minimise property damage

• Building lines were established follow ing severe storms in 1967 and 1974:
- 15m setback north of Goodwin St
- 23m setback south of Goodw in St to Jenkins St 
- Collaroy/Narrabeen Coastline Management Plan (1997)

Adopted in 1997
Identif ies management strategies f or dealing with coastal erosion along the beach. 

Management Strategies include:

• Undertake protective
works
• Environmental planning measures
• Development control and conditions
   Dune management 

DAY 2	Water Point A	Water Point B	Soil Point A	Soil Point B
pH	8.1	7.8	6.8	7.0
Salt (digital)	20 000 ppm	20 000 ppm	1600ppm	1190ppm
Salt (Silver Nitrate) Visual	Real White	Same just a tiny bit less	Not to cloudy	Not to cloudy
MOISTURE SOIL ONLY (OVEN)	N/A	N/A	Before – 45.22g After – 43.85g = 1.37g	Before – 54.50g After – 53.00g = 1.50g
Turbidity (Water)	0.00	5.9	N/A	N/A
Phosphate (water)	25	25-50 (real close to 25)	N/A	N/A
Texture & Colour (Soil)	N/A	N/A	Real lumpy, and cloggy	Same  as before just a bit more softer
Possible Parent Rock(s) (soil)	N/A	N/A	Sandstone	Sandstone
Pollution (water)	None- although sea weed	A lot of sea weed, and pollution (rubbish, and old clothing materials)	N/A	N/A

RESULTS

DAY 1

	Water Point A	Water Point B	Soil Point A	Soil Point B
pH	8.3	8.1	6.7	6.9
Salt (digital)	20 000 ppm	20 000 ppm	1680 ppm	1205 ppm
Salt (Silver Nitrate) Visual	Real White Cloudy	Still Really White but not as much	More Cloudier then B, Cloudy but not incredibly white.	Less Cloudier then A
MOISTURE SOIL ONLY (OVEN)			Before – 52.40g After – 50.70g = 1.7	Before – 55.70g After- 54.25g = 1.45g
Turbidity (Water)	0.00	5.05	N/A	N/A
Phosphate (water)	25	10 – 25 (closer to 10)	N/A	N/A
Texture & Colour (Soil)	N/A	N/A	Grey black (more black) thin and Hard	<  <  <
Possible Parent Rock(s) (soil)	N/A	N/A	Sandstone	<  <  <
Pollution (water)	Sea weed no pollution	A lot of sea weed no pollution	N/A	N/A

Yesterday (27/3/12) I went and got my second set of samples.
Point A's water was pretty similar in condition to the first time, a bit of sea weed, no pollution, but the only real difference was that it was low tide.
Point A's soil was a lot different to what condition it was before. The soil was very clay like, thick, compared to last time when it was not clay like at all and it was very easy to dig up.

Point B's water  was similar to last time very sea weedy, although this time there seemed to be a little bit more sea weed but there was a big difference. POLLUTION- there was pollution all along the shore line (rubbish, wrappers, string, and even a back piece of a bikini top that was very eroded).
Point B's Soil had basically no difference at all.

WHY WAS IT DIFFERENT AND IT'S EFFECT ON RESULTS

Point A's soil- IM guessing dure to the rain and then activity on it straight after, which can effect the results majorly.

Point B's water- Pollution has obviously came through recently which also means that the water could have been polluted aswell, I guess I will just have to way until I do my testing.

After taking my first of two samples there are factors that I have to take into consideration.
Firstly it had been raining for a couple of days prior to me taking the samples.
Secondly at point A in the park the soil was very hard, harder then normal. Point B's soil wasn't as hard but still harder then normal.
Thirdly at Point B in the ocean there was a lot of sea weed present in the water and on the shore line, although point A had a bit swell but no where as much as point B.

In my next time when sampling hopefully the conditions will be different so that we could compare, so I will purposely try and sample on a day when those conditions are different from the first time.