1.1 MB pdf - Bolsa Chica Lowlands Restoration Project

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SECTION 3: ANALYSIS each sump were analyzed for the modified Suite A list of constituents. All middle samples (32 to 36 inches) were also analyzed for the modified Suite A list of constituents. All bottom samples (66 to 72 inches) were analyzed for the Suite B list. Table A-2 lists the constituents tested under each suite. Wet Gas Pipelines After reviewing the results of previous sampling along the gas lines, it was decided to collect an additional 10 surface samples every 2,000 feet along the wet gas lines. Each sample was analyzed for the Suite B list of constituents (Table A-2) plus organochlorine pesticides and PCBs. Existing Dry Gas Line There are approximately 5,500 feet of dry gas line within the Full Tidal area that would have to be removed in the short term. Sampling of the dry gas line involved boring a core every 2,000 feet underneath or directly next to the pipeline. A total of six surface samples were deemed necessary to fully characterize the dry gas line within the Full Tidal area. Since three surface samples were previously collected by Tetra Tech (1996), three were collected. These samples were analyzed for the modified Suite A list of constituents (Table A-2) plus organochlorine pesticides and PCBs. Abandoned Oil Pipelines Additional sampling and testing was conducted along the approximately 14,000 feet of abandoned oil pipeline routes in order to define the extent of both lateral and vertical contamination. Transects of 3 surface samples were collected every 2,000 feet along the abandoned oil line routes at a right angle to the routes. A total of 18 samples were collected and analyzed for the Suite B list of constituents (Table A-2). In addition, every other sample obtained was analyzed for organochlorine pesticides and PCBs. Existing Oil Pipelines Because oil lines outside of the Full Tidal Basin will not be removed in the near future, a decision was made to sample only those oil lines within the Full Tidal area. One surface sample was collected every 2,000 feet along the oil lines. A total of 11 samples were collected, and each one was analyzed for the Suite B list of constituents (Table A-2). In addition, every other sample obtained was analyzed for organochlorine pesticides and PCBs. Old KOBE Area The old KOBE area is a 1-acre facility that was sampled by collecting two cores to a depth of 4 feet bgs. A surface (0 to 6 inches), mid (18 to 24 inches) and bottom (42 to 48 inches) sample was obtained from each boring. The modified Suite A list of constituents was run on both surface samples and the Suite B list was run on the middle and bottom samples (Table A-2). Surface Water Inflows Four surface water inflows were identified for surface sediment sampling. Three of the four were sampled during the ERA Sampling program (Springdale Pump Station, Seapoint Golf Course, and Garden Grove - Wintersburg Channel) by CH2M HILL (1999). Sediment/soil from the fourth location (Edwards Thumb) was collected and analyzed for the modified Suite C list of constituents (Table A-2), and surface water was analyzed for Suite D constituents. SAC/143368(003.DOC) 3-5 ERA REPORT 7/31/02
SECTION 3: ANALYSIS 3.1.2 Data Evaluation The chemical data were evaluated for usability in the ERA (as described in this section) and evaluated for potential risk to representative receptors based on sample location within specific evaluation areas. The data for specific Cells were combined into evaluation areas that either currently have or will have similar habitats after the proposed restoration is completed. These evaluation areas and the Cells included in each one are as follows: • Bolsa Bay - Inner Bolsa Bay (Cell IB) and Outer Bolsa Bay (Cell OB) • Garden Grove - Wintersburg Flood Control Channel - Cell 52 • Full Tidal - Cells 1, 1A, 3 through 8, 15 through 18, 43, 44, 51, 58, 59, 61, and 62 • Future Full Tidal - Cells 14, 19 through 40, and 63 • Muted Tidal plus Rabbit Island - Cells 41, 42, 45 through 50, 53, 55, 60, 66, and 67 • Seasonal Ponds - Cells 2, 9 through 13 • Gas Plant Pond Area - Samples collected downgradient of the former Gas Plant (outside the numbered Cells, just south of Cells 11 and 12) • Sitewide (biota only) - terrestrial invertebrates that were composited from throughout the Lowlands The analytical data used to characterize exposures consist of the sediment/soil, pore water, surface water, and biota collected previously by Tetra Tech (1996) and by CH2M HILL/Kinnetics Laboratories during the ERA Sampling and Analyses and the Focused Sampling and Analyses. These data were compiled into the ERA chemical database presented in Appendix D in electronic format (CD). The electronic data obtained for the Tetra Tech Phase II sampling were checked against the hardcopy to ensure resolution of the items that had precluded their use in the EEC Report (CH2M HILL, 1999). These items included missing samples or groups of analytes, lack of identification for tissue samples, and incompatible structure for inclusion in the electronic database for the EEC Report. During this review, it was found that all of the items could not be fully resolved. The electronic database was still deficient in some areas including missing samples (e.g., diesel and waste oil data were not present for surface water), QA/QC samples included in the data that were not labeled as such, and lack of locational information (i.e., northings and eastings). In addition, the electronic data from Tetra Tech did not include either a method detection limit or reporting limit for those chemicals that were not detected. Chemicals that were not detected had either a zero (“0”) or a blank entry for the value. This results in a slight underestimation of the values calculated in the summary statistics because one-half the reporting limit was still zero for these chemicals. The electronic Tetra Tech data were corrected to the extent possible. Data available electronically from Tetra Tech were incorporated into the ERA chemical database. Tetra Tech data were also not subjected to any addition data validation processes because this was reported to have been completed by Tetra Tech when conducting the Phase II Environmental Assessment (Tetra Tech, 1996). ERA REPORT 3-6 SAC/143368(003.DOC) 7/31/02
Page 1 and 2: REVISED FINAL VOLUME I Ecological R
Page 3 and 4: CONTENTS 3. Analysis...............
Page 5 and 6: CONTENTS 3-21 Summary of EC 50 s an
Page 7 and 8: Executive Summary The Bolsa Chica L
Page 9 and 10: EXECUTIVE SUMMARY The ERA report ev
Page 11 and 12: EXECUTIVE SUMMARY “focused sampli
Page 13 and 14: EXECUTIVE SUMMARY Exposure point co
Page 15 and 16: EXECUTIVE SUMMARY sample. However,
Page 17 and 18: EXECUTIVE SUMMARY The chemicals in
Page 19 and 20: SECTION 1: INTRODUCTION • Sedimen
Page 21 and 22: SECTION 1: INTRODUCTION Assessment
Page 23 and 24: SECTION 1: INTRODUCTION Based on th
Page 25 and 26: SECTION 1: INTRODUCTION 1.5 Organiz
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Page 31 and 32: SECTION 2:PROBLEM FORMULATION 2.2.1
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Page 41 and 42: SECTION 2:PROBLEM FORMULATION Benth
Page 43 and 44: SECTION 2:PROBLEM FORMULATION Fish
Page 45 and 46: SECTION 3: ANALYSIS The field sampl
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Page 53 and 54: SECTION 3: ANALYSIS Pesticides were
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CHAPTER 5: SUMMARY, CONCLUSIONS, AN
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SECTION 6 References Abbasi, S. A.
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SECTION 6: REFERENCES Dunteman, G.
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SECTION 6: REFERENCES Kauss, P. B.
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SECTION 6: REFERENCES RareFind. 199
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SECTION 6: REFERENCES U.S. EPA. 199
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SECTION 6: REFERENCES Wentsel, R. S
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