SPECIAL SPECIFICATION 5159 Soil, Groundwater and Surface Water Management Plan

Transcription

1 2004 Specifications CSJ SPECIAL SPECIFICATION 5159 Soil, Groundwater and Surface Water Management Plan 1. Description. Handle and manage Trichloroethylene impacted soil, groundwater and surface water that may be encountered during construction in accordance with this specification. 2. Soil, Groundwater and Surface Water Management Plan. The Soil, Groundwater and Surface Water Management Plan (SGSWMP), prepared by LCA Environmental, Inc. dated May 2005, is incorporated by reference into this Item. This plan was prepared for the extension of SH 161 from stations 247 to 265 at the Lockheed Martin Missiles and Fire Control affected property. Obtain copies of the SGSWMP at the following location: Contact: John D. Hudspeth, P.E. Design Supervisor Southwest Area Office Greenville Ave. Dallas, TX Phone: (972) Construction. Unless otherwise directed, follow the requirements in the SGSWMP. Perform All work under this Item in compliance with all laws and regulations of the Federal, State and Local governments in whose jurisdiction the service is performed and the following publications (or latest revision) as a minimum. Texas Administrative Code (TAC) Texas Commission on Environmental Quality, Chapter 30 TAC Chapter 335 "Industrial Solid Waste and Municipal Hazardous Waste" Code of Federal Regulations (CFR) United States Department of Labor 29 CFR 1910 "Occupational Safety and Health Standards" 29 CFR 1518 "Safety and Health Regulations for Construction" 4. Measurement and Payment. This Item will be measured and paid for as provided for in Article 9.5. Force Account. This Force Account is established in the contract to pay for expenses associated with compliance with the SGSWMP over and beyond that paid for the

2 normal course of construction. Operations including, but not limited to excavation, dewatering of trenches, pumping to holding areas (placed by others), placement of pipe, daily plugging of pipe, backfilling of trenches, and Type C1 and C2 embankment are normal operations and are excluded from payment under this Item. The engineer has final authority as to what constitutes operations over and beyond normal course of construction with regard to the SGSWMP. This price shall be full compensation for worker safety planning and monitoring; applicable OSHA and environmental regulation compliance. The work performed, materials furnished, and all labor, tools, equipment, and incidentals necessary to complete the work under this contract and in accordance with the SGSWMP shall be paid for under the appropriate bid items

3 SOIL, GROUNDWATER AND SURFACE WATER MANAGEMENT PLAN EXTENSION OF SH 161 STATIONS 247 TO 265 AT LOCKHEED MARTIN MISSILES AND FIRE CONTROL (LMMFC) AFFECTED PROPERTY GRAND PRAIRIE, TEXAS MAY 2005

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5 TABLE OF CONTENTS 1.0 SGSMP PLAN OVERVIEW INFORMATION SOURCES CHEMICAL/CONSTITUENTS OF CONCERN (COCS) ENVIRONMENTAL SPECIALIST GROUND WATER MANAGEMENT SPECIAL SPECIFICATIONS SURFACE WATER MANAGEMENT SPECIAL SPECIFICATIONS SOIL MANAGEMENT SPECIAL SPECIFICATIONS PLAN DOCUMENTATION AND OTHER REQUIREMENTS...8 APPENDICES APPENDIX A FIGURES FIGURE 1 SOIL MANAGEMENT ZONES ON 2003 AERIAL PHOTOGRAPH FIGURE 2 ENSAFE-PROVIDED GROUNDWATER ELEVATIONS FIGURE 3 ENSAFE-PROVIDED TCE GROUNDWATER IMPACT (PLUME) FIGURE 4 NORTHBOUND STORM SEWER TRENCH BOTTOM ELEVATIONS COMPARED TO SPRING 2005 GROUND WATER LEVELS FIGURE 5 SOUTHBOUND STORM SEWER TRENCH BOTTOM ELEVATIONS COMPARED TO SPRING 2005 GROUND WATER LEVELS FIGURE 6 MAY PUSH PROBE LOCATIONS ALONG STORM SEWER TRENCH CENTERLINES FIGURE 7 SGSWMP FLOW CHART APPENDIX B TABLES TABLE GROUNDWATER ANALYTICAL DATA TABLE 2 PRIMARY COCS ON OR NEAR CONSTRUCTION ROW APPENDIX C TTI ENVIRONMENTAL SURFACE WATER SAMPLING ANALYTICAL TESTS APPENDIX D PUSH PROBE LOGS ALONG STORM SEWER TRENCH CENTERLINES APPENDIX E TTI ENVIRONMENTAL PUSH PROBE SOIL SAMPLE ANALYTICAL TESTS

6 1.0 SGSMP PLAN OVERVIEW LCA Environmental, Inc. (LCA) has been retained by the Texas Department of Transportation (TxDOT) to develop this Soil, Groundwater and Surface Water Management Plan (SGSWMP) for a portion of the proposed SH 161 extension from IH20 to SH 183 in Grand Prairie, Texas (henceforth referenced as the SH 161 project). The project right of way (ROW) fronts the existing location of the Lockheed Martin Missiles and Fire Control (LMMFC) facility located southwest of the corner of West Freeway and Marshall Drive. The SH 161 project construction area that is affected by the special circumstances described in this SGSWMP, the so called SGSWMP Zone, extends from the south at approximately Station # 247 to the north at Station #265 (see Figure 1 depicting the limits of the SGSWMP Zone). CONTRACTOR is required to follow the special procedures and specifications described herein while working within the SGSWMP Zone as depicted on Figure 1. CONTRACTOR will construct storm sewers as indicated in the general specification documents, along the south and northbound frontage/access roads of SH 161, and also construct improvements to surface drainage within the SGSWMP Zone. These SH 161 construction activities will penetrate soil, groundwater and surface water zones that are potentially contaminated with chemicals/constituents of concern (COCs) within the project ROW. The contamination reportedly originated from the location of the existing LMMFC facility and was caused by degreasing operations that occurred between 1968 and 1975 (as reported verbally by LMMFC s environmental consultant, ENSAFE). The LMMFC facility is located to the west, adjacent and upgradient to this storm sewer work area. Known conditions that affect the designated SGSWMP Zone involve the presence in relatively shallow groundwater of various dissolved-phase contaminants, primarily trichloroethylene (also called tricholoroethene or TCE), which is a solvent, degreaser compound. CONTRACTOR is advised that the LMMFC TCE groundwater plume passes across the TxDOT ROW in this area. As depicted on Figure 2, groundwater flows to the east-southeast across the ROW ultimately toward the South Branch of Cottonwood Creek. Figure 3 depicts the TCE plume as interpreted by ENSAFE. The bottom elevations of trench excavations for the planned storm sewer installation may be below the groundwater surface from time to time, a condition which could cause contaminated groundwater to seep into the trench. Figures 4 and 5 depict groundwater elevations relative to anticipated trench bottom elevations based on conditions estimated as of Spring Elevations are plotted by Station # for correlation with the general specifications for storm sewer installation. CONTRACTOR may use Figures 4 and 5 as a guideline to anticipate groundwater encounter during trench excavations with the understanding that groundwater levels fluctuate over time and with changing rainfall infiltration patterns. Groundwater seepage into excavations within the SGSWMP zone will then trigger the special procedures described in this SGSWMP. Groundwater is expected to be encountered in at least some portions of the trench excavations, requiring dewatering and handling of contaminated water by CONTRACTOR. CONTRACTOR is required to collect and contain all groundwater in containers that will be provided at a nearby/convenient staging area by a third party, namely LMMFC. CONTRACTOR will not be required to provide containers for storage of contaminated groundwater. Once groundwater has been conveyed to the containers provided, LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

7 CONTRACTOR will have no further responsibility for management of the containers or disposition of the contaminated groundwater. A second known condition, based on sampling recently performed by LCA Environmental, Inc. (TxDOT s environmental consultant) on 22 March 2005 and 13 May 2005, is the presence of dissolved-phase TCE in the surface water drainage feature located in the southern portion of the SGSWMP Zone. TTI Laboratory reports for surface water samples are provided in Appendix C. The drainage feature is currently a natural channel fed from a pipe outfall at the western boundary of the ROW and southwestern section of the SGSWMP Zone. This drainage feature is depicted on Figure 1 as the Surface Water Management Zone, a sub-area of the SGSWMP Zone. Flow in the drainage feature discharges at the southeast corner of the SGSWMP Zone directly into the South Branch of Cottonwood Creek, which then flows to the west under the bridge at West Freeway. Construction activities affecting this drainage feature are not subject to special procedures. CONCTRACTOR should be aware that surface water is affected by dissolvedphase TCE at concentrations potentially as high as 471 mg/l. CONTRACTOR is advised to take this information under advisement when producing a health and safety plan for this project. As a precaution, this SGSWMP also addresses a third condition presently considered a remote (unlikely) possibility, that TCE or other contaminants could be encountered in excavated dry soil. If encountered, the contamination would most likely be present as residual from historically elevated groundwater that left contamination behind in a smear zone. However, no evidence of such a smear zone currently exists. On 16 May 2005, a subsurface push probe investigation consisting of fourteen probes to 10 feet of total depth was performed by LCA Environmental, Inc. As depicted on Figure 6, five push probes were introduced along the approximate center line (CL) of the northbound storm sewer trench and nine along the southbound CL. Probe boring logs are presented in Appendix D. The predominant soil type within trench profiles was relatively low permeability sandy clays (some very stiff). One soil sample was collected and presented to TTI Environmental Laboratories for analysis of common industrial pollutants such as volatile organic compounds (VOCs), semivolatile organic compounds (SVOCs) and certain heavy metals. As presented in Appendix E (TTI Laboratory Report) no levels of concern were detected in soil samples collected within the northbound and southbound trench profile. Fieldscreening of push probes using a photoionization detector (PID) did not indicate the presence of contamination. Special construction practices within the SGSWMP Zone will be triggered if field indicators of contaminated soil occur during ordinary excavations or trenching. CONTRACTOR is required to retain an ENVIRONMENTAL SPECIALIST to field-screen excavated soils using a PID or equivalent instrument. In the event affected soils are identified, they should be stockpiled by CONTRACTOR in an area to be designated by TxDOT, probably on nearby LMMFC property at a location which will not interfere with CONTRACTOR s operations. LMMFC (not CONTRACTOR) will then become responsible for proper transport and disposal of contaminated soil stockpiles. Figure 7, SGSWMP Flow Chart, generally summarizes CONTRACTOR s responsibilities and procedures to be followed within the designated zones with respect to soil and groundwater management. CONTRACTOR should read and rely on the entire SGSWMP document for strict adherence to the special specification requirements. LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

8 Regulatory Overview Clarification of CONTRACTOR s waste generator/transporter status and role of LMMFC TxDOT is not aware of any regulatory impediments to the implementation of this SGSWMP as written. Regarding soils excavated during the storm sewer construction Texas Risk Reduction Program (TRRP) 30 TAC (a) states...the excavation of soils containing COCs during construction activities...and the subsequent replacement of those soils into that same excavation shall not be considered to constitute relocation or reuse and shall not be subject to the provisions of this section. Contractor should not plan to reuse excavated soils, affected or otherwise, within the SGSWMP because the overall project is net waste. However, incidental reuse of soils in isolated circumstances is allowed because of the TRRP provisions. Furthermore, the United States Environmental Protection Agency (US) set a precedent in 1992 (Sylvia K. Lowrance memorandum), acknowledging that Resource Conservation and Recovery Act (RCRA) requirements and responsibilities are not in force within an area subject to typical excavation on public roadways. TAC (h), excludes transportation of material potentially classified as hazardous on public roadways across contiguous properties from the normal requirements of marking and manifesting, and CONTRACTOR may be asked to stockpile material on LMMFC property adjacent and to the west of TxDOT ROW. Based on previously mentioned soil testing in the storm sewer trench profile, it is not likely that affected soils will be identified. If they are identified, a third party, namely LMMFC, will take full responsibility as the generator and transporter of record for any affected soils encountered during construction. If affected soils are identified, CONTRACTOR S responsibility will be to temporarily stockpile affected soils in a safe and convenient area and then notify TxDOT so that arrangements can be made with LMMFC for timely removal of the material. As previously mentioned, Figure 7 SGSWMP provides a limited detail procedure flow chart for CONTRACTOR s convenience which should not replace the need to understand the entire SGSWMP document. 2.0 INFORMATION SOURCES LCA used the following information as a basis for development of this SGSWMP. For simplicity, this SGSWMP does not attempt to detail data, interpretations, construction plans, or other information not needed to understand and follow this SGSWMP. The information reviewed as a basis for SGSWMP development generally included the following: June 2003 Affected Property Assessment Report for the LMMFC facility, prepared by Ensafe (Lockheed s environmental consultant); Relevant groundwater analytical and elevation data provided directly by ENSAFE, on behalf of LMMFC. Elevation data through November Analytical (dissolved-phase contaminants of concern) through May TxDOT SFEIS re-evaluation pages 5-19 through Discussions with LMMFC and ENSAFE personnel in a meeting on 13 April Results of surface water sampling by LCA on 22 March and 13 May 2005, presented in Appendix C (TTI Laboratory report) LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

9 Results of Phase II Subsurface Investigation, performed on May 16, push probes along the northbound and southbound storm sewer trench excavations (results provided in Appendix D and E). 3.0 CHEMICAL/CONSTITUENTS OF CONCERN (COCS) Between 28 February and 24 May 2005, LCA reviewed and evaluated all information provided by LMMFC, TxDOT, and LCA s own investigations. Table 1 (Groundwater Data Summary Table ) provides a summary of the COCs detected in groundwater by ENSAFE on or near the SH 161 project area. Six chemicals have, at one time or another, been consistently detected above laboratory analytical reporting limits on or near the project ROW. This SGSWMP is based on volatile COCs that have been detected at least once in the ROW. These COCs include 1,1,1 trichloroethane, 1,1,2-trichloroethane, 1,1-dichloroethene, cis-1,2- dichloroethene, tetrachloroethene, and TCE. Table 2 provides a summary of analytical results indicating maximum concentrations found above the Tier 1 Residential Protective Concentration Levels (PCLs). TCE has also been detected in surface water within the SGSWMP zone. 4.0 ENVIRONMENTAL SPECIALIST CONTRACTOR shall employ or otherwise engage the services of an ENVIRONMENTAL SPECIALIST to implement this SGSWMP. The duties of the ENVIRONMENTAL SPECIALIST shall include but are not limited to: $ Field screening of excavated soils. $ Verification of temporary plug to prevent flow of contaminated ground water from excavation into storm sewer pipe. $ Supervising trench dewatering activities and conveyance to containers. The minimum qualifications of the ENVIRONMENTAL SPECIALIST are as follows: $ Two years of verifiable experience in sampling and management of VOC contaminated soil and groundwater. $ Successful completion of 40-hour Hazardous Waste Operation and Emergency Response (HAZWOPR) training. $ Professional registration as one (1) or more of the following: Professional Engineer by the State of Texas, Registered Environmental Manager/Registered Environmental Professional by the National Registry of Environmental Professionals, Professional Geoscientist by the State of Texas, or a TCEQ-registered Corrective Action Project Manager. LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

10 5.0 GROUND WATER MANAGEMENT SPECIAL SPECIFICATIONS SGSWMP figures are provided as Appendix A. Figure 1 presents the SGSWMP Zone boundaries overlain on a recent (2003) aerial photograph. Figure 2 presents the ENSAFE/LMMFC groundwater elevation data as of November Figure 3 presents the extent of TCE impact, as provided by ENSAFE/LMMFC. Figure 4 presents the anticipated bottom elevation of the northbound storm sewer trench compared to a composite of groundwater elevations reported in November 2004 and Spring 2005 (April/May). Figure 5 presents the anticipated bottom elevation of the southbound storm sewer trench compared to groundwater elevations reported in November 2004 and Spring 2005 (April/May). All groundwater should be considered contaminated within the limits of the SGSWMP zone. Groundwater dewatering during stormwater trench excavations will require containerization of extracted groundwater. CONTRACTOR should not pump groundwater directly onto the surface or into the sanitary storm sewers. Such activity is strictly prohibited. Rainwater in an otherwise dry trench may be handled without special provisions so long as affected soils are not identified. If groundwater is identified then CONTRACTOR should take reasonable steps to avoid rainwater entry into excavated areas subject to groundwater seepage. In the event rainwater comes into contact with contaminated groundwater then LMMFC will provide storage containers at a location convenient for temporary storage of groundwater. CONTRACTOR will arrange for conveyance of trench groundwater to on-site containers. It will be LMMFC s responsibility to arrange for proper transportation and disposition of stored groundwater. At no time will CONTRACTOR be required to sign a waste manifest as generator of stored groundwater. CONTRACTOR s responsibility ends with conveyance of groundwater to the storage containers provided by LMMFC. Upon visual indications of groundwater, CONTRACTOR is required to dewater trenches and convey the water to nearby containers provided by a third party (LMMFC or its designated contractor). Groundwater removed from the excavation must be contained. Pumping groundwater directly onto the surface or into the sanitary or storm sewers is prohibited. During the utility construction when groundwater is present, CONTRACTOR shall use plugs or other equivalent methods to prevent groundwater flowing into the installed sewer pipe or open trench down stream. Daily checks of the plug shall be made by the ENVIRONMENTAL SPECIALIST for a period of at least five consecutive days. If the results of the 5 consecutive days of plug inspection do not identify a breach, weekly inspections shall then be conducted. If a breach is identified by the CONTRACTOR or the ENVIRONMENTAL SPECIALIST, utility work shall cease immediately and the plug shall be repaired immediately. A breach shall be defined as a flow volume greater than 1 gallon per hour of groundwater into the upstream opening of the storm sewer or breach in the storm water sewer pipe. After breach repair by the CONTRACTOR, the ENVIRONMENTAL SPECIALIST shall inspect the plug for 5 consecutive days as conducted during the initial plug installation. LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

11 CONTRACTOR is required to minimize entry of rainfall to trench sections encountering groundwater. Any practical steps are allowed to prevent rainfall runoff from entering a trench where groundwater has been observed. Any rainfall runoff coming into contact with contaminated groundwater should be conveyed the same as specified for groundwater. Rainfall in an otherwise dry trench does not trigger special provisions. Groundwater Yield from Trenches The CONTRACTOR will have the responsibility of determining the pace of the excavation work and the depths of the excavations. The deeper the trench and greater the number of linear feet that are exposed at the same time, the greater the volume of the groundwater that must potentially be removed. Figures 2, 4 and 5 are provided to assist CONTRACTOR in this evaluation. CONTRACTOR is encouraged to review this information carefully to determine the likelihood of groundwater encounter along any portion of the ROW within the SGSWMP zones (station #s identified). Based on information available during the first quarter of 2005, groundwater may be encountered between stations #252 and 254. Figure 7 presents the SGSWMP Flow Chart which summarizes the decision points for groundwater management. Absence of groundwater in the trench indicates that no special procedures are required. 6.0 SURFACE WATER MANAGEMENT SPECIAL SPECIFICATIONS In accordance with general specifications for the SH 161 project, CONTRACTOR is required to modify the drainage feature flowing toward the southeast. The feature is depicted within the boundaries designated as Surface Water Management Zone on Figure 1. Flow in the drainage feature discharges directly into the South Branch of Cottonwood Creek which flows to the east under the bridge at West Freeway. LCA determined that surface water was affected by TCE at locations SW-1, SW-2, and SW-3 (also depicted on Figure 1). The TTI Laboratories analytical reports are provided as Appendix C. Construction activities affecting this drainage feature are not subject to special procedures. CONTRACTOR is advised that dissolved TCE is present in surface water at a concentration known to be as high as 471 mg/l. CONTRACTOR is further advised to take this information under consideration when developing a health and safety plan for the area designated on Figure 1 as the surface water management zone. 7.0 SOIL MANAGEMENT SPECIAL SPECIFICATIONS This SGSWMP calls for field screening of soil generated by construction activities. Soil-only (dry soil) contamination is unlikely based on the results of investigations performed. On 16 May 2005, a subsurface push probe investigation consisting of fourteen probes to 10 feet of total depth was performed by LCA Environmental, Inc. As depicted on Figure 6, five push probes were introduced along the approximate center line (CL) of the northbound storm sewer trench and nine along the southbound. Probe boring logs are presented as Appendix D. The predominant soil type within trench profiles was of relatively low permeability sandy clays (some very stiff). One soil sample from each probe was collected and presented to TTI LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

12 Environmental Laboratories for analysis of common industrial pollutants including volatile organic compounds (VOCs), semivolatile organic compounds (SVOCs) and the RCRA regulated heavy metals arsenic (As), barium (Ba), cadmium (Cd), chromium (Cr), lead (Pb), mercury (Hg), silver (Ag), and Selenium (Se). As presented in Appendix E (TTI Laboratory Report), no levels of concern were detected in soil samples collected within the northbound and southbound trench profile (along the approximate CL). Apparently elevated concentrations of As, Pb, and Ba were found consistent with naturally occurring conditions in the area. Field-screening of push probes using a photoionization detector (PID) did not indicate the presence of contamination. Soil that is dry within the excavation trenches is not anticipated to be contaminated. As a precaution, this SGSWMP specifies field-screening of soil because of the known presence of contaminants which appear to mostly exist below the lowermost elevations of the northbound and southbound storm sewer trenches. Special construction practices within the SGSWMP Zone will be triggered if field indicators of contaminated soil occur during ordinary excavations or trenching. Any affected soils will be stockpiled by CONTRACTOR in an area to be designated by TxDOT on nearby LMMFC property at a location which will not interfere with CONTRACTOR s operations. LMMFC (not CONTRACTOR) will then be responsible for proper transport and disposal of contaminated soil stockpiles. Field-screening To determine the general soil quality in the storm sewer excavation, an ENVIRONMENTAL SPECIALIST will field-screen soil as it is removed and initially stockpiled adjacent to an excavation area during construction activities. Field-screening will consist of utilizing a photoionization detector (PID) and/or a flame-ionization detector (FID) to detect volatile organic compounds (VOCs), as well as noting visual and subjective indicators (e.g., staining and/or odors). Should the PID or FID indicate concentrations of VOCs equal to or less than an established background level, the soil may be reused or relocated in any part of the construction area. In the unlikely event visual, odor or instrument indicators of contamination are noted, TxDOT should be notified and the soil temporarily stockpiled at a convenient location as designated by TxDOT. CONTRACTOR will have no further responsibility for the soil beyond notification of TxDOT and temporary stockpiling of soil. Should it become necessary to stockpile contaminated soil for off-site transport by LMMFC, rather than CONTRACTOR transporting the soil as clean, the ENVIRONMENTAL SPECIALIST will inform TxDOT s agent so that arrangement can be made to contact LMMFC. In such an event, LMMFC would be the generator of the soil waste. Decontamination Procedures In the event significant soil contamination is encountered, CONTRACTOR will be responsible for the decontamination of construction equipment. Additionally, the CONTRACTOR shall permit construction equipment that has come into contact with suspected contaminated soil active in the SGSWMP zone to depart that zone only after proper decontamination procedures LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

13 have been conducted. This provision will only be triggered in the event of the presence of affected soil. 8.0 PLAN DOCUMENTATION AND OTHER REQUIREMENTS Revisions to the SGSWMP Special circumstances may dictate temporary or permanent changes or exceptions to this plan. Any changes or exceptions made in the field to the SGSWMP should be discussed with the TxDOT Engineer in Charge, or their designated representative, and fully documented with the Report Form for Changes in Soil, Groundwater and Surface Water Management Plan. In particular, CONTRACTOR may unexpectedly encounter similar conditions outside the formal management zones. CONTRACTOR s ENVIRONMENTAL SPECIALIST should notify TxDOT immediately to coordinate a proper response and extension of the general procedures and strategies described in this SGSWMP. Field Documentation To document field conditions, the on-site ENVIRONMENTAL SPECIALIST will maintain entries in a weather-resistant field notebook. The entries will record CONTRACTOR activity and all observations relative to the proper implementation of the SGSWMP. All field instrument readings and sample collection data will be kept in the field notebook. In addition, the following forms will be kept to further document daily occurrences at the site within the various management areas: C C C Roadway Excavation and Designated Fill Location Log. Utility Trench Excavation Groundwater Management Log. Daily Field Summary for Soil Screening/Sampling - Areas/Excavations/Stockpiles Overall supervision of construction under the plan should be documented using the Supervision Documentation Form, which should be reviewed and executed by the Engineer in Charge. This form should be used to summarize and document overall compliance with the plan during specific continuous periods of time such as a single day, several continuous days, or up to a full week of project progress. This form should be completed and filed at least once a week during the course of the project. Plan Certification Persons critical to the proper implementation of this SGSWMP should become familiar with its requirements and file the appropriate certifying documents with the TxDOT Engineer in Charge as indicated on the forms provided. LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

14 DAILY FIELD SUMMARY FOR ROADWAY EXCAVATION & FILL LOCATION LOG ENVIRONMENTAL SPECIALIST: DATE: AREA OF EXCAVATED SOILS ESTIMATED VOLUME EXCAVATED LOCATION OF ROADWAY FILL MATERIAL SAMPLES COLLECTED OTHER ACTIONS TAKEN OR CONDITIONS NOTED: LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

15 TRENCH/EXCAVATION GROUNDWATER MANAGEMENT LOG ENVIRONMENTAL SPECIALIST: DATE: AREA LOCATION/TIME Trench Dimensions and Depth to Groundwater Tank Size Estimated volume pumped from trench OTHER ACTION TAKEN OR CONDITION NOTED: LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

16 DAILY FIELD SUMMARY FOR SOIL SCREENING AREAS/EXCAVATIONS/STOCKPILES ABOVE BACKGROUND ENVIRONMENTAL SPECIALIST: DATE: Today s Background Readings: PID FID AREA OF ELEVATED INSTRUMENT READINGS FID/PID Reading Action Taken OTHER ACTIONS TAKEN OR CONDITIONS NOTED: LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

17 REPORT FORM FOR CHANGES IN SOIL, GROUNDWATER and SURFACE WATER MANAGEMENT PLAN ENVIRONMENTAL SPECIALIST: DATE: DESCRIPTION OF REQUIRED CHANGES: REASON(S) FOR CHANGES: INSPECTOR S SIGNATURE: DATE: LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

18 SUPERVISION DOCUMENTATION FORM (To be Completed and Executed periodically by CONTRACTOR s ENVIRONMENTAL SPECIALIST In Charge of the Soil, Groundwater and Surface Water Management Plan) Project: SH 161 at LMMFC Affected Property City of Grand Prairie Dallas County, TX This document must be completed after supervision of applicable management of soil and groundwater at the site during specific intervals (may be one or several continuous days) to signify that the work on the dates specified has been properly managed in accordance with the procedures detailed in the Soil, Groundwater and Surface Water Management Plan for the project. General Description of Activities and Areas Under Supervision on the Dates Specified: Signed: Name: Title: Company: Address: Telephone: Date(s): LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

19 CERTIFICATION OF SOIL AND GROUNDWATER MANAGEMENT PLAN Project Name and Location Name: Location: SH 161 at LMMFC Affected Property City of Grand Prairie, Dallas County, Texas Operator Names and Addresses TxDOT maintains the site under normal circumstances from one or more offices on-site. Soil and Groundwater Management Plan Team Responsibility Name Phone (day/emergency) ENVIRONMENTAL SPECIALIST in Charge of SGSWMP Secondary Contact for ENVIRONMENTAL SPECIALIST Primary TxDOT Contact Secondary TxDOT Contact Main CONTRACTOR Contact Utility CONTRACTOR Contact Contractor Health & Safety Officer LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

20 CONTRACTOR and SUBCONTRACTOR Names and Addresses The following list includes the key CONTRACTORs and all Subcontractors that may work on the project site specifically during the Soil, Groundwater and Surface Water Management Plan (SGSWMP). The general CONTRACTOR and all subcontractors involved in disturbing contaminated media must sign the SGSWMP certification. Other CONTRACTORs may be added as required. CONTRACTOR and Subcontractors with Primary Responsibility for utility installations and excavations that could potentially penetrate contaminated soil or groundwater: ENVIRONMENTAL SPECIALIST Responsible for Overseeing Performance Contract as related to achievement of the requirements of the Soil, Groundwater and Surface Water Management Plan (SGSWMP) and safety of its own personnel during excavation: For additional space, see attached pages. Project: SH 161 at LMMFC Affected Property This certification must be completed by an authorized signatory of each operator (TxDOT, CONTRACTOR ENVIRONMENTAL SPECIALIST, and Subcontractor) before the effective date of the Plan. Signed: Name: Title: Company: Address: Telephone: Date: LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

21 CONTRACTOR/SUB-CONTRACTOR CERTIFICATION Project: SH 161 at LMMFC Affected Property This certification is to be completed by the general CONTRACTOR and each Subcontractor involved in any on-site activities related to the construction. Signed: Name: I certify that I understand the requirements of the Soil, Groundwater and Surface Title: Water Management Plan (SGSWMP) construction site identified as part of this Company: certification. Specifically, I understand that the construction crew under my control will Address: follow the instructions of the on-site ENVIRONMENTAL SPECIALIST in the areas Telephone: identified to potentially contain contaminated soil and groundwater which may special Date: handling and procedures as dictated by the SGSWMP. LCA Project No SGSWMP for SH 161 LMMFC-Affected Property LCA Environmental, Inc. City of Grand Prairie, Dallas County, Texas

22 APPENDIX A FIGURES

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26 Figure 4 - Northbound Frontage Road Storm Sewer - Spring Elevation (ft.) Expected Trench Bottom Elevations Combined Groundwater Elevations Station Line # (South North)

27 Figure 5 - Southbound Frontage Road Storm Sewer - Spring Elevation (ft.) Expected Trench Bottom Elevations Combined Groundwater Elevations Station Line # (South North)

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29 Figure 7 - Soil and Groundwater Management Flow Chart Soil Management Commence Storm Sewer Installation or any Excavation Work in the SGSWMP Area Groundwater Management Notify TxDOT. Temporarily stockpile for analysis and disposal by LMMFC. Yes Field screen soil. PID above Background? Groundwater in trench? No Proceed with work. No special procedures. No Yes Transport off ROW or reuse anywhere on project site as necessary. Notify TxDOT. Dewater excavation and convey groundwater directly to LMMFC container provided. Take necessary steps to protect trench from rainfall infiltration to minimize mixing rainfall with groundwater. After groundwater is observed, all water in hole in vicinity of groundwater encounter must be conveyed to container.

30 APPENDIX B TABLES

31 Table I LMMFC Groundwater Data Summary SAMPLE LOCATION EW-1 MW-1 SAMPLE NAME EW1G EW1G EW1G EW1G LMMGEW0101 LMMHEW0101 LMMGEW0102 LMMGEW0103 MW1G MW1G MW1G MW1G MW1G MW1G MW1G MW1G MW1G MW1G LMMGMW0101 LMMGMW0102 LMMGMW0103 SAMPLE DATE 8-Jun Jun Jun Jun-01 3-May-02 3-May Sep May Aug Sep Jul-95 1-Jun Jun-97 8-Jun Jun Jun Jun Jun-01 3-May Sep May-04 VOA 1,1,1-Trichloroethane NS 160 NS ( 17.3) NS 1500 NS 6 NS NS ( 25) 43 ( 5) ( 50) ( 69.2) 1,1,2,2-Tetrachloroethane NS ( 5) NS ( 5) ( 100) ( 100) ( 17) ( 22.7) NS ( 10) NS ( 5) NS NS ( 25) ( 25) 12 ( 50) ( 10) ( 3.4) ( 90.8) 1,1,2-Trichloroethane NS ( 5) NS 11 ( 10) ( 10) ( 11) ( 13.1) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 2.2) ( 52.4) 1,1-Dichloroethane NS 7.8 NS ( 12) ( 25.2) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 101) 1,1-Dichloroethene NS 230 NS NS 22 NS NS ( 25) ,2-Dichloroethane NS ( 5) NS ( 5) ( 10) ( 100) ( 18) ( 20.5) 100 ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 3.6) ( 82) 1,2-Dichloroethene (Tot) NS ( 5) NS NS NS NS NS NS NS 42 NS NS 46 ( 25) NS NS NS NS NS 2-Butanone (MEK) NS NS NS NS ( 100) ( 100) ( 48) NS NS NS NS NS NS NS NS NS NS NS ( 100) ( 9.6) NS 2-Hexanone NS NS NS NS ( 1000) ( 100) ( 29) ( 40.3) NS NS NS NS NS NS NS NS NS NS ( 100) ( 5.8) ( 161) 4-Methyl-2-pentanone NS NS NS NS ( 1000) ( 1000) ( 27) NS NS NS NS NS NS NS NS NS NS NS ( 100) ( 5.4) NS Acetone NS ( 5) NS ( 5) ( 250) ( 250) ( 230) ( 142) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 250) ( 46) 871 Benzene NS ( 5) NS ( 5) ( 10) ( 10) ( 9.6) ( 22.5) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 1.9) ( 90) Carbon disulfide NS ( 5) NS ( 5) ( 100) ( 10) ( 72) ( 9.8) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 14) ( 39.2) Carbon Tetrachloride NS ( 5) NS ( 5) ( 10) ( 10) ( 15) ( 12.8) NS 16 NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 3) ( 51.2) Chlorobenzene NS ( 5) NS ( 5) ( 10) ( 100) ( 10) ( 21.3) NS ( 10) NS ( 5) NS NS ( 25) ( 25) 11 ( 50) ( 10) ( 2) ( 85.2) Chloroform NS ( 5) NS ( 5) ( 100) ( 100) ( 12) ( 19.4) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 2.4) ( 77.6) Chloromethane NS ( 5) NS ( 5) ( 100) ( 10) ( 40) ( 45.3) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 8) ( 181) cis-1,2-dichloroethene NS NS NS NS NS NS NS NS NS NS NS NS Hexachlorobutadiene NS NS NS NS NS NS NS ( 24.3) NS NS NS NS NS NS NS NS NS NS NS NS 99.4 Methylene chloride NS NS NS NS ( 50) ( 500) NS ( 44.5) NS NS NS NS NS NS NS NS NS NS ( 50) NS 254 Styrene NS ( 5) NS ( 5) ( 10) ( 10) ( 5) ( 13.5) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) 1.2 ( 54) tert-butyl methyl ether NS NS NS NS NS NS NS ( 17.9) NS NS NS NS NS NS NS NS NS NS NS NS ( 71.6) Tetrachloroethene NS 23 NS ( 5) ( 100) ( 100) ( 43) ( 22.7) NS 62 NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 8.6) ( 90.8) Toluene NS ( 5) NS ( 5) ( 100) ( 10) ( 6.5) ( 21.3) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) 2.7 ( 85.2) trans-1,2-dichloroethene NS NS NS ( 5) ( 10) ( 10) ( 36) ( 13.9) NS NS NS NS NS NS NS NS NS ( 50) ( 10) ( 7.2) ( 55.6) Trichloroethene Trichlorotrifluoroethane NS NS NS NS NS NS NS ( 36) NS NS NS NS NS NS NS NS NS NS NS NS ( 144) Vinyl Chloride NS ( 5) NS ( 5) ( 100) ( 10) ( 13) ( 8.9) NS ( 10) NS ( 5) NS NS ( 25) ( 25) ( 5) ( 50) ( 10) ( 2.6) ( 35.6) SAMPLE LOCATION MW-2 MW-3 SAMPLE NAME MW2G MW2G MW2G MW2G MW2G MW2G MW2G MW2G LMMGMW0201 LMMGMW0202 LMMGMW0203 MW3G MW3G MW3G MW3G MW3G MW3G MW3G MW3G MW3G LMMGMW0301 LMMGMW0302 SAMPLE DATE 15-Aug Sep Jul-95 1-Jun Jun Jun Jun Jun-01 3-May Sep May Aug Sep Jul-95 1-Jun Jun-97 8-Jun Jun Jun Jun-01 2-May May-04 VOA 1,1,1-Trichloroethane NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) 0.15 ( 0.346) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.173) 1,1,2,2-Tetrachloroethane NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.17) ( 0.454) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.227) 1,1,2-Trichloroethane NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.11) ( 0.262) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.131) 1,1-Dichloroethane ( 5) ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.12) ( 0.504) ( 5) ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.252) 1,1-Dichloroethene ( 5) ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.31) ( 0.458) ( 5) ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.229) 1,2-Dichloroethane 9 ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.18) ( 0.41) ( 5) ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.205) 1,2-Dichloroethene (Tot) NS NS NS NS NS NS NS NS ( 10) ( 0.48) NS NS NS NS NS NS NS NS NS NS ( 10) NS 2-Butanone (MEK) NS NS NS NS NS NS NS NS ( 10) ( 0.29) ( 0.806) NS NS NS NS NS NS NS NS NS ( 10) ( 0.403) 2-Hexanone NS NS NS NS NS NS NS NS ( 10) ( 0.27) NS NS NS NS NS NS NS NS NS NS ( 10) NS 4-Methyl-2-pentanone NS ( 10) NS ( 5) NS NS NS ( 25) ( 25) ( 2.3) ( 2.84) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 25) ( 1.42) Acetone NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.096) ( 0.45) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.225) Benzene 25 ( 10) NS ( 5) NS NS NS NS NS NS NS ( 5) ( 10) NS ( 5) NS NS NS NS NS NS NS Carbon disulfide NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.72) ( 0.196) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.098) Carbon Tetrachloride NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.15) ( 0.256) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.128) Chlorobenzene NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.1) ( 0.426) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.213) Chloroform NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) 0.22 ( 0.388) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.194) Chloromethane NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.4) ( 0.906) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.453) cis-1,2-dichloroethene NS NS NS NS NS NS NS ( 25) NS NS NS NS NS NS NS NS ( 5) ( 1) ( 0.163) Hexachlorobutadiene NS NS NS NS NS NS NS NS NS NS ( 0.486) NS NS NS NS NS NS NS NS NS NS ( 0.243) Methylene chloride NS NS NS NS NS NS NS NS ( 5) NS ( 0.89) NS NS NS NS NS NS NS NS NS ( 5) ( 0.445) Styrene NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) 0.12 ( 0.27) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.135) tert-butyl methyl ether NS NS NS NS NS NS NS NS NS NS ( 0.358) NS NS NS NS NS NS NS NS NS NS ( 0.179) Tetrachloroethene NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) 0.67 ( 0.454) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.227) Toluene NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.426) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.213) trans-1,2-dichloroethene NS NS NS NS NS NS NS ( 25) 1.3 ( 0.36) ( 0.278) NS NS NS NS NS NS NS NS ( 5) ( 1) ( 0.139) Trichloroethene ( 5) 880 ( 5) ( 5) ( 5) ( 10) ( 5) 5 ( 5) 13 ( 5) ( 5) ( 5) 0.34 ( 0.27) Trichlorotrifluoroethane NS NS NS NS NS NS NS NS NS NS 33.5 NS NS NS NS NS NS NS NS NS NS ( 0.36) Vinyl Chloride NS ( 10) NS ( 5) NS NS NS ( 25) ( 1) ( 0.13) ( 0.178) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.089) NOTES: 1 - Numbers in parentheses indicate the quantification limits, not the 2 - "NS" means the sample was not tested for that analyte. 3 - Bolded values indicate detections exceeding the lower 4 - Shaded values indicate detections exceeding the lower detection limits. If the analyte concentration is in parentheses, All values in ug/l of the Residential Tier 1 PCLs. of the Industrial/Commercial Tier 1 PCLs. the analyte was not detected in the sample.

32 Table I LMMFC Groundwater Data Summary SAMPLE LOCATION MW-4 SAMPLE NAME MW4G MW4G MW4G MW4G MW4G MW4G MW4G MW4G MW4G MW4G LMMGMW0401 LMMGMW0402 SAMPLE DATE 15-Aug Sep Jul-95 1-Jun Jun-97 8-Jun Jun Jun Jun Jun-01 2-May May-04 VOA 1,1,1-Trichloroethane NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 3.46) 1,1,2,2-Tetrachloroethane NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 4.54) 1,1,2-Trichloroethane NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 2.62) 1,1-Dichloroethane 13 ( 10) NS 15 NS NS 16 NS NS ( 5) 2.9 ( 5.04) 1,1-Dichloroethene NS 21 NS NS ( 12) NS NS ( 5) ,2-Dichloroethane ( 13) ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 4.1) 1,2-Dichloroethene (Tot) NS 53 NS NS 39 NS NS NS NS NS 2-Butanone (MEK) NS NS NS NS NS NS NS NS NS NS ( 40) NS 2-Hexanone NS NS NS NS NS NS NS NS NS NS ( 40) ( 8.06) 4-Methyl-2-pentanone NS NS NS NS NS NS NS NS NS NS ( 40) NS Acetone NS ( 10) NS 49 NS NS ( 12) NS NS ( 5) ( 100) ( 28.4) Benzene NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 4.5) Carbon disulfide NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 1.96) Carbon Tetrachloride NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 2.56) Chlorobenzene NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 4.26) Chloroform NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 3.88) Chloromethane NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 9.06) cis-1,2-dichloroethene NS NS NS NS NS NS NS NS NS ( 5) Hexachlorobutadiene NS NS NS NS NS NS NS NS NS NS NS ( 4.86) Methylene chloride NS NS NS NS NS NS NS NS NS NS ( 20) ( 8.9) Styrene NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 2.7) tert-butyl methyl ether NS NS NS NS NS NS NS NS NS NS NS ( 3.58) Tetrachloroethene NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 4.54) Toluene NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 4.26) trans-1,2-dichloroethene NS NS NS NS NS NS NS NS NS ( 5) 1.9 ( 2.78) Trichloroethene Trichlorotrifluoroethane NS NS NS NS NS NS NS NS NS NS NS 47.4 Vinyl Chloride NS ( 10) NS ( 5) NS NS ( 12) NS NS ( 5) ( 4) ( 1.78) SAMPLE LOCATION MW-5 MW-6 SAMPLE NAME MW5G MW5G MW5G MW5G MW5G MW5G MW5G MW5G MW5G LMMGMW0501 LMMGMW0502 MW6G MW6G MW6G MW6G MW6G MW6G MW6G MW6G MW6G LMMGMW0601 LMMGMW0602 SAMPLE DATE 15-Aug Sep Jul-95 1-Jun Jun-97 8-Jun Jun Jun Jun-01 2-May May Aug Sep Jul-95 1-Jun Jun-97 8-Jun Jun Jun Jun-01 2-May May-04 VOA 1,1,1-Trichloroethane NS 21 NS 7 NS NS NS ( 5) ( 50) ( 1) ( 0.346) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.173) 1,1,2,2-Tetrachloroethane NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.454) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.227) 1,1,2-Trichloroethane NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.262) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.131) 1,1-Dichloroethane ( 50) 13 NS 7 NS NS NS ( 5) ( 50) 0.73 ( 0.504) ( 5) ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.252) 1,1-Dichloroethene ( 50) 42 NS ( 5) NS NS NS ( 5) ( 50) ( 5) ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.229) 1,2-Dichloroethane ( 50) ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.41) ( 5) ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.205) 1,2-Dichloroethene (Tot) NS 60 NS NS NS NS NS NS NS ( 5) ( 10) NS ( 5) NS NS NS NS NS NS NS 2-Butanone (MEK) NS NS NS NS NS NS NS NS NS ( 10) NS NS NS NS NS NS NS NS NS NS ( 10) NS 2-Hexanone NS NS NS NS NS NS NS NS NS ( 10) ( 0.806) NS NS NS NS NS NS NS NS NS ( 10) ( 0.403) 4-Methyl-2-pentanone NS NS NS NS NS NS NS NS NS ( 10) NS NS NS NS NS NS NS NS NS NS ( 10) NS Acetone NS ( 10) NS ( 5) NS NS NS ( 50) ( 50) ( 25) ( 2.84) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 25) ( 1.42) Benzene NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.45) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.225) Carbon disulfide NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.196) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.098) Carbon Tetrachloride NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.256) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.128) Chlorobenzene NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.426) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.213) Chloroform NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.388) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.194) Chloromethane NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.906) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.453) cis-1,2-dichloroethene NS NS NS NS NS NS NS NS ( 50) NS NS NS NS NS NS NS NS 180 ( 1) ( 0.163) Hexachlorobutadiene NS NS NS NS NS NS NS NS NS NS ( 0.486) NS NS NS NS NS NS NS NS NS NS ( 0.243) Methylene chloride NS NS NS NS NS NS NS NS NS ( 5) 1.03 NS NS NS NS NS NS NS NS NS ( 5) ( 0.445) Styrene NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.27) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.135) tert-butyl methyl ether NS NS NS NS NS NS NS NS NS NS ( 0.358) NS NS NS NS NS NS NS NS NS NS ( 0.179) Tetrachloroethene NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.454) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.227) Toluene NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) ( 1) ( 0.426) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.213) trans-1,2-dichloroethene NS NS NS NS NS NS NS NS ( 50) ( 1) ( 0.278) NS NS NS NS NS NS NS NS ( 5) ( 1) ( 0.139) Trichloroethene ( 10) 210 ( 5) ( 5) 5.5 ( 5) ( 5) ( 5) ( 1) ( 0.27) Trichlorotrifluoroethane NS NS NS NS NS NS NS NS NS NS ( 0.72) NS NS NS NS NS NS NS NS NS NS ( 0.36) Vinyl Chloride NS ( 10) NS ( 5) NS NS NS ( 5) ( 50) 0.32 ( 0.178) NS ( 10) NS ( 5) NS NS NS NS ( 5) ( 1) ( 0.089) NOTES: 1 - Numbers in parentheses indicate the quantification limits, not the 2 - "NS" means the sample was not tested for that analyte. 3 - Bolded values indicate detections exceeding the lower 4 - Shaded values indicate detections exceeding the lower detection limits. If the analyte concentration is in parentheses, All values in ug/l of the Residential Tier 1 PCLs. of the Industrial/Commercial Tier 1 PCLs. the analyte was not detected in the sample.