Quality Assurance Project Plan Including Sampling And Analysis Plan (Page 30 of 67) in pdf

Quality Assurance Project Plan Including Sampling And Analysis Plan Page 30

Hunters Point Shipyard Parcel F ESTCP Demonstration Plan

Appendix A: Quality Assurance Project Plan

transferred to laboratory conditions within 2h of collection where they will be sieved for Corophium

spp.amphipods. Each sieved sediment sample shall provide at least 200 mg wet weight of amphipods.

A.3.2.2.4

Quadrat Surface Sediment Collection and Sieving

At each of the sampling locations shown in Figure A-5, surface sediment (0-10 cm) will collected from

0.25-m quadrats once before and twice after plot treatments as shown in Table A-1 and placed in separate,

labeled plastic buckets prior to processing. The benthic organisms existing in these quadrat sediment

samples will be sieved using a 500µm sieve, preserved in 10% formaldehyde solution in the field, and

transferred to the laboratory in 500mL polyethylene jars. A total of 75 quadrats will be sieved during the

entire study producing 75 benthic community samples. By comparing the macrofaunal composition that

exists in the benthic community samples collected before and after treatments, the AC treatment effects

upon benthic recolonization, community structure and organism growth can be determined.

A.3.2.2.5

Surface Water Sample Collection

Overlying water above the all five plots will be sampled simultaneously soon after the high tide recovers

the plots before and after treatment with AC, as indicated in Table A-1. This sampling event for the five

plots will be repeated after the first set of samples is obtained. A total of 40 water samples will be

collected for analysis. The method is similar to the surface water sampling method used in the EPA Lake

Michigan Mass Balance Study ( ). The inlet of the

sampling tube will be positioned and anchored 0.5 ft above the sediment surface and submerged under

water during high tide. The method involves sampling up to 50 L of water per sample from the field,

pumping the water through a pre-combusted glass fiber filter paper with a nominal pore size of 0.7

microns, and passing the filtered water through a pre-cleaned XAD-2 resin adsorbent column. The filter

paper containing the suspended particulates and the XAD-2 resin columns containing trapped dissolved

PCBs will be shipped in a cooler to the UMBC laboratory for extraction and PCB analysis.

A.3.2.2.6

Sediment Core Sample Collection

According to the schedule in Table A-1, sediment core samples will be collected to evaluate the depth and

homogeneity of the treatments in the sediment and the sediment PCB concentrations. At each of the

sampling locations shown in Figure A-5, 2.0-inch-diameter sediment core samples will be taken once

before and twice after AC treatment for a total of 75 core samples during the entire project. Samples will

be collected, capped, and returned to Stanford for processing.

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Quality Assurance Project Plan Including Sampling And Analysis Plan Page 30