1. Lamma Power Station Navigation Channel Improvement
Sediment and Water Sampling and Elutriate test

Table of Contents

1. INTRODUCTION

2. Sampling

3. SAMPLE PREPARATION

4. TESTING OF MARINE WATER ELUTRATE

List of APPENDICES

Appendix 1 Testing Report

Appendix 2 Quality Control Report

1 Introduction

The laboratory was responsible to collect three marine sediments and marine water from the Navigation Channel near the of Lamma Power Station area. The samples were then analysed for various metal, organics and physical parameters

2 Sampling

Sediment and marine water sampling were performed on 12 December 2001. Approximately 3kg of marine sediment was collected by using a stainless steel Ponar Grab from three locations:

Sample Identification Sampling Location

Sample A 828240E 808540N

Sample B 828540E 807270N

Sample C 828780E 806000N

All samples were kept in food-grade plastic bags, securely packed in cooler box during sampling and transportation to the laboratory.

Approximately 40L of marine water was collected from the nearby area, approximately 15m from sampling location C and kept in acid/organic rinsed bottles.

All water sample was securely packed in cooler box during sampling and stored in 4^oC cool room before analysis began.

3 Sample Preparation

The three sediment samples were homogenised in the laboratory and extracted with the collected marine water in according to the elutriation method as described in “Evaluation of Dredged Material Proposed for Ocean Disposal (Testing Manual), Environmental Protection Agency and Department of the Army, Feb, 1991, EPA Contract No.68-C8-0105”.

In this method, one part of sediment was mechanically mixed with four parts of marine water (vol/vol) without aeration for half an hour at the room temperature. The supernatant water solution was then filtered using a filter of 0.45mm pore size, separated and analysed for the required analyte.

For each soil sample to be analysed, samples of different weight was placed in separate BOD bottles. Aerated-seeded water was then added to each bottle and the initial dissolved oxygen content of each sample was determined. The bottles were then positioned onto a shaker and gently agitated in a dark environment for 5 days. Dissolved oxygen content of each sample was determined every 2 days. If the dissolved oxygen level was found to drop below 2 mg/l at any stage of the analysis, the sample was retested.

4 Testing of Marine Water Elutriate

The elutriate was analysed for the following parameters

Analyte Description	Reference Method Used	Instrumentation
Pollutant Metals including (Cr, Cd, Cu, Ni, Pb, Ag, As, ZN)	USEPA 6020	ICPMS
Mercury	APHA 3112	Cold Vapour FIAS
Sediment Oxygen Demand	In-house method	BOD Incubation Setup
Total Kjeldahl Nitrogen	APHA 4500Norg:B	Flow injection Analyser
Ammonia NItrogen	APHA 4500NH3:G	Flow injection Analyser
Oxidisable Nitrogen	APHA 4500NO3:F	Flow injection Analyser
Polychlorinated Biphenyls	USEPA 8082/8270	GCMS
Polyaromatic Hydrocarbon	USEPA 8270	GCMS
Chlorinated Pesticides	USEPA 8270	GCMS
Tributyl Tin	USEPA 8270 (mod)	Derivatization – GCMS
Redox Potential	APHA 2580B	Redox Potential Meter
pH Value	APHA 4500H :B	pH Meter
Particle Sizing	GEO Report No36 Test 2.9.2A	S. S. Sieves