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HomeMy WebLinkAbout10036_South End Transit_sub-slab_vapor_sampling_plan-final_120418-OCR JLB Partners, LLC Sub-Slab Vapor Sampling Work Plan,-Charlotte NC PSI Project No: 0457116 April 18, 2012 Page 1 of 8 April 18, 2012 Mr. Tony Duque NC Brownfields Program 1646 Mail Service Center, Room 3409-K Raleigh NC 27699-1646 RE: Post Construction Sub-slab Vapor Sampling Work Plan Proposed Transit-Oriented, Multi-Family Residential Project, Southline Apartments 140 Remount Road, Charlotte, North Carolina (the “Property”) PSI Project Number: 0457116 Brownfields Project Number # 10036-06-60 Tony: The proposed Multi-Family Residential Project located in the northeast quadrant of Remount Road and Dunavant Street in Charlotte, North Carolina, is currently under construction. To satisfy the requirements of vapor intrusion monitoring of the proposed structures, and based on conversations with the Brownfields incident manager and JLB’s environmental attorney, the following Post Construction Sub-slab Vapor Sampling Plan was developed. Approved Vapor Mitigation System In the fall of 2011, JLB Southline, LLC, the current property owner, elected to voluntarily install passive vapor mitigation systems under all of the buildings on the Property. The passive vapor mitigation system for each of the proposed structures consist of at least one sub-slab vapor lateral with a chemical resistant vapor barrier under the building slabs. There are nineteen (19) proposed structures; eighteen (18) proposed multi-family structures and one (1) leasing office/club house. The following is a description of the vapor laterals and the chemical resistant vapor barrier. On November 10, 2011, the Brownfields Program of Department of Environment and Natural Resources (DENR) approved the specifications attached as Appendix A for a Vapor Mitigation System for the buildings on the property. A copy of the email from Will Service of JLB Partners, LLC Sub-Slab Vapor Sampling Work Plan,-Charlotte NC PSI Project No: 0457116 April 13, 2012 Page 2 of 8 the North Carolina Brownfields Program approving the system design is attached. At the time of the approval of the Vapor Mitigation System, the Brownfields Program asked for submittal of work plan for sub slab vapor sample collection. VI Guidelines and Required Sub Slab Vapor Sampling As stated above, JLB Southline, LLC voluntarily agreed to install a passive vapor mitigation system underneath each building on the Property. DENR has recently issued Draft Vapor Intrusion Guidelines (March 2012) governing when vapor mitigation is required at Brownfields Properties (the “VI Guidelines”). PSI has considered the step-wise process of the VI Guidelines to determine which buildings at the Property are required by the Brownfields Program to be screened for vapor intrusion and then proposed a Sub-Slab Vapor Sampling Plan only for those buildings where such sampling is required by the VI Guidelines. Groundwater Screening Levels PSI has created Table 1 showing groundwater data collected on the Property, as well as data collected from monitoring wells and sampling points located within 100 feet of any building footprint on the adjacent property to the east of the railroad tracks. The dashed line on Figure 2 shows the approximate 100 foot boundary used for consideration in this analysis. Groundwater data exceeding the Residential Vapor Intrusion Screening Levels are shown in bold and highlighted in yellow on Table 1. The groundwater samples which have concentrations exceeding the Acceptable Groundwater Concentrations set fourth in the January 2012 Residential Vapor Intrusion Screening Levels are indicated on Figure 2 in red. Soil Analytical Results From 2006 through February 2012, soil samples have been collected across the Property as part of various environmental assessments from Phase II Environmental Site Assessments, underground storage tank removals, and soil sampling a required by the approved Brownfields Agreement. During these sampling events, soil has been collected and analyzed for volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), RCRA Metals, and total petroleum hydrocarbons (TPH). Historical soil sampling locations maps and soil sample summary tables are provided in Appendix B. The historical sampling results on the Property indicate that there are no VOCs, SVOCs, petroleum constituents, and RCRA metals above the inactive hazardous site branch (IHSB) preliminary residential health-based soil remediation goals ((SRGs) January 2012). However, the soil samples collected in accordance with the Post-Construction Soil Sampling Plan dated February 8, 2012 and documented in the Post Construction Sampling Report and Soil Excavation Work Plan dated March 12, 2012, confirm that concentrations of VOCs and SVOCs are below the laboratory method detection limits and/or the reported concentrations are below the IHSB preliminary residential health-based SRGs except for one soil sample (AREA-1-SS-3). The soil analytical results for soil sample AREA-1-SS-3 indicated that there JLB Partners, LLC Sub-Slab Vapor Sampling Work Plan,-Charlotte NC PSI Project No: 0457116 April 13, 2012 Page 3 of 8 were no VOCs above laboratory method detection limits. The analytical results did show SVOCs above the IHSB preliminary residential health-based SRGs. Based these analytical results, additional soil samples (AREA-1-SS-1-NW-1, AREA-1-SW-1, AREA-1-SW-1A, and AREA-1-SW-2) were collected within the area. These soil samples were used to delineate the horizontal extent of the soil impact in the area. The impacted soil within this area is scheduled to be removed in the next few weeks and disposed of off-site at an approved disposal facility. Thus, it should not be considered in the analysis of vapor intrusion. Required Sub-Slab Vapor Sampling Based on historical groundwater sampling events, three (3) monitoring wells (MW-5, OA-GW- 1, and OA-GW-2) on the northern portion of the subject property and five (5) monitoring wells (PS-GW-1, PS-GW-2, MW-4, WS-GW-6 and WS-GW-8) located on the northwest and northeast adjoining properties have documented groundwater impact above the Residential Vapor Intrusion Groundwater Screening Levels. Based on the VI Guidelines, PSI is proposing to collect sub-slab vapor samples under the buildings which are within 100-feet of groundwater impacts exceeding the Residential Vapor Intrusion Groundwater Screening Levels. Based on the above mentioned, criteria six (6) of the nineteen (19) proposed structures will have sub-slab vapor samples collected in accordance with the VI Guidelines. The buildings outlined in red on Figure 1 indicate the buildings from which sub-slab vapor samples will be collected. Sub Slab Sampling Procedures PSI is proposing to collect a sub-slab vapor sample from each of the passive vapor mitigation systems installed under the identified structures on Figure 1. One sub-slab vapor sample will be collected from each building system seven to ten days after the installation of the foundation slab for the structure is completed. The sub-slab samples will be collected from the sampling tube installed along the vapor lateral. Each vapor sample will be collected in a laboratory provided air canister (Summa®) equipped with a 3-hour sampling regulator. Each sampling canister will be equipped with a vacuum gauge. Each of the Summa® canisters will be attached to the sub-slab vapor sampling tubing via the inlet of the sampling regulator. Once the Summa® canister is connected to the sampling tubing the valve on the canister will be opened and the start time and initial vacuum will be documented. After the three hours and/or the vacuum on the Summa® canister is below 10- inches of mercury, the vacuum reading and completion time will be documented. The canister valve will be closed and the sampling tube will be disconnected from the sampling regulator. The canister will be labeled and placed into a shipping container and shipped to a North Carolina certified laboratory for analysis. The process will be repeated for each sub- slab vapor mitigation system sampled. It should be noted that the above vapor sampling procedure does not call for the use of a helium tracer gas, which deviates from the NCDENR JLB Partners, LLC Sub-Slab Vapor Sampling Work Plan,-Charlotte NC PSI Project No: 0457116 April 13, 2012 Page 4 of 8 vapor intrusion sub-surface vapor sampling protocol. This deviation is based on several items:  The vapor sampling port is not a vertical sampling port installed through the building slab. It is a horizontal sampling port that was installed during the installed of the sub- slab vapor collection piping. With the influent of the sampling point located in the center of the building (under the slab) and the effluent located on the perimeter of the building.  In order to determine if the sample point has a short circuit to ambient air; a containment system would have to be constructed around the perimeter of each building scheduled for sampling. Since each of the buildings are approximately 60-feet wide and approximately 100-feet in length this would not be practical or cost effective. There for the helium portion of the NCDENR vapor sampling protocol has been omitted. Each of the sub-slab vapor samples will be analyzed for volatile halocarbons by EPA Method TO-15. Once the sampling is completed and PSI receives the analytical data, the data will be compared to the Residential Vapor Intrusion Soil Vapor Screening Levels and a report will be generated summarizing the laboratory results and providing conclusions and recommendations regarding the sub-slab sampling results to the Brownfields Program. If you have any questions regarding this correspondence please feel free to contact me. Respectfully submitted, PROFESSIONAL SERVICE INDUSTRIES, INC. Bryan M. Lucas Cate Landry, PE Senior Project Manager Department Manager Paul Wachsmuth, PE (GA) Principal Consultant Enclosures Cc: Mr. Scott Schlosser (via email only, w/encls) Carol Jones Van Buren, Esq. (via email only, w/encls) JLB Partners, LLC Sub-Slab Vapor Sampling Work Plan,-Charlotte NC PSI Project No: 0457116 April 13, 2012 Page 5 of 8 TABLE Table 1: Groundwater Analytical Data Summary (Detected Parameters) 8260B - VOCs 8260B - VOCs 8260B - VOCs 8260B - VOCs 8260B - VOCs 8260B - VOCs 8260B - VOCs 8260B - VOCs 8260B - VOCs 8260B - VOCs 8260B - VOCs Boring Location Sample ID Date Collected (m/dd/yy) Sample Depth (ft BGS) 2205 Dunavant Street MW-4 1/3/2008 5.7 6.2 ND ND ND 0.64 ND ND 26 ND ND 2205 Dunavant Street PS-GW-1 10/23/2006 1.1 7.4 ND 1 1.8 3.2 ND 1.2 84 5.9 ND 2205 Dunavant Street PS-GW-3 10/23/2006 0.76 J 5.4 ND ND ND 0.82 J ND 1.6 110 17 ND 2235 Hawkins Street MW-5 1/3/2008 0.5 1.7 ND ND ND ND 0.55 2.1 160 ND 1.2 2383 Dunavant Street OA-GW-1 10/20/2006 1.1 ND ND ND ND 0.87 J ND ND ND ND ND 2383 Dunavant Street OA-GW-2 10/20/2006 0.76 J 1.4 0.91 J ND ND ND ND ND 44 10 ND 2321 Dunavant Street MW-3 7/26/2011 ND ND ND ND ND ND ND ND ND ND ND 2321 Dunavant Street MW-3 1/3/2008 ND ND ND ND ND ND ND ND ND ND ND 2300 South Boulevard WS-GW-8 10/23/2006 ND 3.5 ND ND ND ND Nd ND 3 ND ND 2300 South Boulevard WS-GW-6 10/26/2006 ND 31 ND ND ND ND ND ND 3.9 ND ND 7.3 NE 65 20 NE 3,900 3,900 12 1.1 37 44 NOTES 1. Data obtained from Environemntal Assessment Reports provided by Former Property Owner 8. NE = Not established 3. NCDENR = North Carolina Department of Environment and Natural Resources BOLD 6. ND = Not Detected at Method Detection Limits Southline Multi-Family Residential 140 Remount Road Charlotte, Mecklenburg County, North Carolina PSI Project No. 0457116 Analytical Method 4. IHSB = Inactive Hazardous Site Branch 5. VOCs = volatile organic compounds 2. Results reported in µg/L = micrograms per liter 1, 1 - D i c h l o r o e t h e n e Laboratory Reported Concentrations above Laboratory Reporting Limits Results Meet or Exceed the NCDENR-IHSB Residential Vapor Intrusion Screening Levels for Acceptable Groundwater Concentrationsfor Acceptable Groundwater Concentrations.BOLD 1, 2 - D i c h l o r o e t h a n e Tr i c h l o r o f l u o r o m e t h a n e 1, 1 , 2 - T r i c h l o r o e t h a n e Me t h y l t e r t i a r y b u t y l et h e r ( M T B E ) To l u e n e Tr i c h l o r o e t h e n e (T C E ) Is o p r o p y l e t h e r ( I P E ) ci s - 1 , 2 - D i c h l o r o e t h e n e 7. J = Detected but below the Reporting Limit (lowest calibration standard); therefore, result is an estimated concentration (CLP J-Flag) Te t r a c h l o r o e t h e n e (P C E ) Ch l o r o f o r m NCDENR - IHSB Vapor Intrusion Screening Levels Residential - Acceptable Groundwater Concentrations (February 2012) Contaminant of Concern Page 1 of 1 JLB Partners, LLC Sub-Slab Vapor Sampling Work Plan,-Charlotte NC PSI Project No: 0457116 April 13, 2012 Page 6 of 8 FIGURES JLB Partners, LLC Sub-Slab Vapor Sampling Work Plan,-Charlotte NC PSI Project No: 0457116 April 13, 2012 Page 7 of 8 APPENDIX - A 1 Bryan Lucas From:Service, Will <will.service@ncdenr.gov> Sent:Thursday, November 10, 2011 1:42 PM To:Carol Van Buren; Duque, Tony Cc:Scott Schlosser; Lucas, Bryan Subject:RE: Soil Vapor Sampling Method - Southline Site Carol,  I have reviewed the additional information you sent today; the proposal for sub‐slab vapor sampling to verify the  performance of the sub‐slab venting system, and the design specification for the horizontal spacing of the vapor  collection piping.  With this additional information, the “Vapor Mitigation System” proposal for the buildings in question  is approved as written.      The methods for sub‐slab vapor sample collection look reasonable, but we will ask for a sampling work plan submittal  prior to the time sampling is done.      Please contact me if you have any questions.  Thanks!  Will       From: Carol Van Buren [mailto:cvanburen@vanburenlaw.com] Sent: Thursday, November 10, 2011 12:19 PM To: Service, Will; Duque, Tony Cc: Scott Schlosser; Bryan M. Lucas Subject: Fwd: Soil Vapor Sampling Method - Southline Site See the email from Bryan below regarding the soil vapor sampling. Bryan will be sending you an email momentarily regarding the justification for a single horizontal pipe under each building. JLB would greatly appreciate an email from Will stating that the soil vapor specs will be approved with these changes. Carol     Carol Jones Van Buren, Esq.  Van Buren Law, PLLC  5925 Carnegie Blvd., Suite 530  Charlotte, NC 28209    Email:             cvanburen@vanburenlaw.com  Phone:           704/366‐4608  Cell:                704/408‐7368  Fax:                 704/625‐3620  Website:        www.vanburenlaw.com    PRIVILEGE AND CONFIDENTIALITY NOTICE:  This communication (including any attachment) is being sent by or on behalf of a lawyer  or law firm and may contain confidential or legally privileged information.  The sender does not intend to waive any privilege,  2 including the attorney‐client privilege, that may attach to this communication.  If you are not the intended recipient, you are not  authorized to intercept, read, print, retain, copy, forward, or disseminate this communication.  If you have received  this communication in error, please notify the sender immediately by email and delete this communication and all copies.    To ensure compliance with requirements imposed by the IRS, Van Buren Law informs you that any U.S. federal tax advice contained  in this communication (including any attachments) is not intended or written to be used, and cannot be used, for the purpose of (i)  avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction  or matter addressed within. Begin forwarded message: From: "Lucas, Bryan" <bryan.lucas@psiusa.com> Date: November 10, 2011 12:10:45 PM EST To: <cvanburen@vanburenlaw.com> Subject: Soil Vapor Sampling Method - Southline Site   Will;    It was nice talking with you this morning about the vapor mitigation system for the Southline development project in Charlotte. As we discussed in the conference call, I am providing you with the proposed methodology for collecting soil vapor samples from underneath the proposed building slabs.       A sampling tube will be installed along one of the proposed vapor laterals under each building slab. These sample tubes  will be constructed of ¼‐inch inside diameter by 5/16‐inch outside diameter Teflon tubing. The tubing will be installed along the outside of the proposed vapor lateral so the one end of the tubing is approximately at the center point of the  lateral and the other end will be accessible for sample collection were the vapor laterals connect to the vertical vent piping.     Seven (7) to ten (10) days following the installation of the building slab, one soil gas sample will be collected from  underneath each building slab utilizing the sub‐slab sample tube (as described below). Each soil gas sample will be collected using a 6‐liter summa canister with a three hour orifice. The summa canisters will be connected to the effluent  of the sample tubing. This sample method will generate a three‐hour composite soil gas sample from underneath each building slab. Each of the air samples will be analyzed for volatile organic compounds (VOCs).     If the subslab soil gas sample for a particular building does not show VOCs above screening levels, no further action will be required for that building.  If the subslab soil gas sample detected VOCs above screening levels,  PSI will evaluate with  the input of NCDENR if any additional sampling is required or if any of the passive mitigation systems have to be converted to active systems at that time.       Also, PSI will be sending in a second email its justification for using a single horizontal pipe under each building.      Bryan M. Lucas, CES, CEM  Senior Project Manager/Principal Consultant  Environmental Services  Professional Service Industries, Inc. (PSI)  5021 West WT Harris Boulevard  Charlotte, North Carolina 28269  704.598.2234 x102 (Office)  704.598.2236 (Fax)  3 704.222.0660 (Mobile)  bryan.lucas@psiusa.com      PSI - www.psiusa.com - 125 Offices Nationwide Environmental Consulting * Geotechnical Engineering Construction Materials Testing & Engineering * Industrial Hygiene NDE * Facilities & Roof Consulting * Specialty Engineering & Testing This e-mail and any attachments are for the sole use of the intended recipient(s) and may contain confidential and/or privileged material. If you have received this e-mail in error, please contact the sender and delete the material from any computer. You are hereby notified that any unauthorized disclosure, copying, distribution, or use of this transmitted information is strictly prohibited. XXXXX-1 SECTION XXXX VAPOR MITIGATION SYSTEM PART 1 - GENERAL 1.1 DESCRIPTION A. This section contains requirements for the installation of a vapor mitigation system. B. The purpose of the vapor mitigation system is to prevent potential intrusion of petroleum and chlorinated vapors from impacted soil and groundwater into the buildings. 1.2 DEFINITIONS A. CAULKS AND SEALANTS - those materials which will significantly reduce the flow of gases through small openings in the building shell. B. CONDITIONED SPACE - all spaces which are provided with heated and/or cooled air or which are maintained at temperatures over 50 deg. F during the heating season, including adjacent connected spaces separated by an un-insulated component (e.g. basements, utility rooms, garages, corridors). C. CONTRACTOR - a building trades professional licensed by the state. D. DEPRESSURIZATION - a condition that exists when the measured air pressure is lower than the reference air pressure. E. ELASTOMERIC - that property of macromolecular material of returning rapidly to approximately the initial dimensions and shape, after substantial deformation by a weak stress and release of stress. F. Mil - 1mil=1/1000 of a meter G. MITIGATION - The act of making less severe, reducing or relieving. H. OUTSIDE AIR - air taken from the outdoors and, therefore, not previously circulated through the system. I. SOIL DEPRESSURIZATION SYSTEM - a system designed to withdraw air below the slab through means of a vent pipe and fan arrangement or venting turbine. J. SOIL GAS - gas which is always present underground, in the small spaces between particles of the soil or in crevices in rock. Major natural constituents of soil gas include nitrogen, water vapor, carbon dioxide, and (near the surface) oxygen. Contaminants which may be present in the soil gas include volatile petroleum constituents such as benzene toluene ethylbenzene and xylenes (BTEX) and chlorinated solvents such as 1,2- dichloroethene. K. VAPOR BARRIER – High density polyethylene (HDPE) flexible sheet material; or other system of materials placed between the soil and the XXXXX-2 building for the purpose of reducing the flow of soil gas into the building. L. VENTILATION - the process of supplying or removing air, by natural or mechanical means, to or from any space. Such air may or may not have been conditioned. 1.3 SCOPE OF WORK A. Subgrade soil shall be excavated to a minimum depth of 4-inches below the bottom of the ground floor slab and any shallow foundation components and 12-inch along the vapor laterals. It should be noted that if impacted soil is encountered during excavation activities of the vapor mitigation piping, footers, grade beams, and installation of utilities a qualified hazardous materials specialty contractor will be required to handle the impacted soil as described in the site soil management plan. B. Install a minimum 4-inch thick granular blanket beneath the entire building slab. The granular blanket may be constructed of coarse sand, pea gravel, or other self-compacting material having an in-place hydraulic conductivity of greater than 1 x 10-3 cm/sec. C. The base of the excavation shall be sloped in accordance with the grading plan to prevent ponding of water in the subgrade. Therefore, the thickness of the gravel blanket will vary between 4-inches and 18+ inches. D. Install vapor recovery piping within the granular blanket. The vapor recovery piping shall be constructed of 4-inch diameter Schedule 40 PVC flush threaded well screen. The well screen will be machine slotted with at least a 0.040 inch slot size, and covered with a geotextile sock. Vapor recovery piping shall be installed horizontally beneath the building slab at intervals of no less than one (1) vapor lateral (along the centerline) per building slab (SEE FIGURE 1). However, in buildings requiring a split foundation a vapor lateral will be installed along the centerline of each building slab (SEE FIGURE 2). E. The vapor recovery piping shall be connected to a common riser, which shall be run inside each building within a utility corridor. The vapor recovery riser shall terminate in a vent, which shall extend a minimum of 2-feet above the top of the building and shall be capped with a turbine. The vent stack should be installed to meet all of the following requirements: (1) be ten feet or more from any window, door, or other opening (e.g., operable skylight, or air intake) into conditioned spaces of the structure, XXXXX-3 (2) be ten feet or more from any opening into an adjacent building. The total required distance (ten feet) from the point of discharge to openings in the structure shall be measured either directly between the two points or be the sum of measurements made around intervening obstacles. If the point of discharge is at or below any window, door, or other opening into conditioned spaces of the structure the total required distance (ten feet) shall be measured horizontally between the two points. F. The passive vapor recovery system should be installed to allow easy conversion to an active recovery system, if this ever should become necessary. Conversion of the system to active would require the installation of a vacuum blower or fan on the vent stack. G. A vapor barrier, consisting of minimum 10 mil, reinforced HDPE plastic sheeting shall be installed immediately above the granular blanket and below the concrete slab. The vapor barrier should extend beneath the entire building slab. H. All utility penetrations through the vapor barrier shall be sealed to the extent possible. Overlapping joints in the vapor barrier shall be sealed with a butyl rubber, or equivalent sealant. PART 2 - PRODUCTS 2.1 PERMEABLE BACKFILL MATERIAL A. Permeable backfill shall consist of self-compacting import soil having a compacted permeability of no less than 1 x 10-3 cm/sec. Acceptable materials are: 1. Pea gravel. 2. 57 stone. 2.2 VAPOR BARRIER A. Vapor barrier membrane material shall consist of minimum 10 mil, reinforced high density polyethylene (HDPE) sheeting. B. Acceptable materials are Florprufe™ 120 Vapor Barrier, manufactured by Grace Construction Products or engineer-approved equivalent. C. Vapor barrier materials must provide excellent environmental stress crack resistance, impact strength and high tensile strength including additives to retard polymer oxidation and UV degradation. 2.3 VAPOR PIPING A. Horizontal (i.e., slotted) vapor piping shall consist of 4-inch diameter, Schedule 40 flush-threaded PVC, factory-slotted well screen (0.040 inch slot size). B. Horizontal vapor piping shall be wrapped in geotextile fabric (sock). XXXXX-4 C. Vertical (i.e., non-slotted) vapor piping shall be 4-inch diameter, Schedule 40 PVC piping or piping approved by local building and/or fire codes. D. A 6-inch Schedule 80 PVC will be installed in the building footing to allow the Vapor Lateral with the sample tubing to pass through the building footing (See Figure 3). 2.4 SOIL VAPOR SAMPLING TUBE A. Prior to wrapping the vapor laterals in the geotextile fabric a ¼-inch inside diameter by 3/8-inch outside diameter Teflon sample tube is to be installed along each of the vapor laterals. B. One end of the Teflon tubing will be attached at the midpoint of the lateral. The sampling tubing will be installed parallel to vapor lateral and will be terminated approximately 1-foot above the finished grade at the vapor lateral riser. C. The Teflon tubing will be fastened to the vapor lateral using nylon cable ties. The cable ties will be spaced approximately every 18-inches along the vapor lateral (See Figure 3). D. Once the sample tubing is installed and secured to the vapor lateral the vapor lateral will be wrapped in the geotextile fabric (sock). 2.5 CAULKS, SEALANTS and TAPES A. All caulks and sealants shall be resistant to petroleum and chlorinated solvent vapors. B. Acceptable caulks and sealants shall conform with ASTM C920-87 "Standard Specifications for Elastomeric Joint Sealants" and ASTM C962-86 "Standard Guide for Use of Elastomeric Joint Sealants". C. All sealant materials and methods of application shall be compatible with the location, function and material of the surface or surfaces being sealed. D. Caulks and sealants shall be applied in accordance with manufacturer’s directions. E. Tapes used as a sealant shall be resistant to petroleum and chlorinated solvent vapors and shall have a permeability of less than 10-6 cm/sec. PART 3 - EXECUTION 3.1 EXCAVATION A. Contractor shall excavate soils beneath each building slab to a minimum depth of 4-inches below the bottom of the slab, and a minimum of 12- inches in the trenches of the vapor laterals (See Figure 1 & 2) 3.2 INSTALLATION OF PERMEABLE BACKFILL A. Permeable backfill material shall be installed beneath each building slab to a minimum depth of 4-inches below the bottom of the slab, and a XXXXX-5 minimum of 12-inches in the trenches of the vapor laterals (See Figure 1 & 2). B. The vapor barrier and vapor recovery piping shall be installed within the backfill material as directed in Sections 3.3 and 3.4. C. The backfill shall be placed in a controlled manner to avoid crushing of the vapor recovery piping. 3.3 INSTALLATION OF VAPOR PIPING A. The vent piping shall be installed within the permeable backfill at approximately the center of the permeable layer (see Figure 1 and 2). B. Temporarily cap the ends of the piping during installation to prevent backfill material from entering the vapor recovery piping. C. Slotted vent piping shall be installed horizontally throughout the foot- print of the building area as shown on provided drawings. However, in the event that grade beams or underground obstructions will present a barrier to the lateral flow of air between horizontal piping sections, spacing shall be decreased to allow at least 1 pipe per column line. D. The lateral vapor piping shall have a minimum slope of 1/8 inch per foot in order to drain any condensation back to soil beneath the soil gas retarder. The system shall be designed and installed so that no portion will allow the excess accumulation of condensation. E. Vent pipes shall be terminated in locations that will minimize human exposure to the exhaust air. Locations shall be above the eave of the roof. To prevent exposure to vented soil vapor, the point of discharge from vents shall meet all of the following requirements: 1. be ten feet or more from any window, door, or other opening (e.g., operable skylight, or air intake) into conditioned spaces of the structure, 2. Be ten feet or more from any window, door, or other opening (e.g., operable skylight, or air intake) into conditioned spaces of the structure, and (3) be ten feet or more from any opening into an adjacent building. The total required distance (ten feet) from the point of discharge to openings in the structure shall be measured either directly between the two points or be the sum of measurements made around intervening obstacles. If the point of discharge is at or below any window, door, or other opening into conditioned spaces of the structure the total required distance (ten feet) shall be measured horizontally between the two points. F. All exposed components of the soil depressurization system shall be labeled "Soil Gas System" to prevent accidental damage or misuse. Labels XXXXX-6 shall be on a yellow band, two inches wide and spaced three feet apart on all components. G. All vent piping shall be located in compliance with existing and applicable codes, with regards to clearances from mechanical equipment and flues and notching of structural members. No vent shall penetrate a fire wall or party wall. H. Vent pipes shall be fastened to the structure of the building with hangers, strapping, or other supports that will adequately secure the vent material. Plumbing pipes, ducts, or mechanical equipment shall not be used to support or secure a vent pipe. I. Supports for vent pipes shall be installed at least every 6 feet on horizontal runs. Vertical runs shall be secured either above or below the points of penetration through floors, ceilings, and roofs, or at least every 8 feet on runs that do not penetrate floors, ceilings, or roofs or as local/state or federal codes require. J. Vent pipes shall be installed in a configuration that ensures that any rain water or condensation within the pipes drains downward into the ground beneath the slab or soil-gas barrier. K. The vent pipe shall be capped at the terminus with a minimum 4-inch diameter, galvanized venting turbine, which is capable of operating in low-wind conditions. The ventilator shall be a Model PT4A-4” ventilator, manufactured by WSM Company, or equivalent. L. Vent pipes shall not block access to any areas requiring maintenance or inspection. Vents shall not be installed in front of or interfere with any light, opening, door, window or equipment access area required by code. M. Cleaning solvents and adhesives used to join plastic pipes and fittings shall be as recommended by manufacturer’s for use with the type of pipe material used in the mitigation system. 3.4 INSTALLATION OF VAPOR BARRIER A. The vapor barrier shall be installed to form a continuous sheet across the entire building footprint. B. All seams of the vapor barrier membrane shall be lapped at least 12 inches or as required by the manufacturer. Seams shall be sealed with an approved sealant. C. Where pipes, columns or other objects penetrate the vapor barrier, it shall be cut and sealed to the pipe, column or penetration. D. Punctures or tears in the vapor barrier membrane shall be repaired with the same or compatible material. XXXXX-7 E. Seal vapor barrier membrane to foundation walls or grade beams at building perimeter using approved sealant. F. Avoid extended traffic over vapor barrier to prevent punctures or tears in the vapor barrier membrane. Any punctures or tears will be repaired as specified by the manufacturer’s guidelines. 3.5 SEALING OF SLAB PENETRATIONS A. Small cracks and joints with widths less than 1/16 inch (0.0625") shall be repaired by the application of an elastomeric material capable of withstanding at least 25 percent extension and extending at least 4 inches beyond the length and width of the crack. B. Large cracks and joints with widths larger than 1/16 inch (0.0625") shall be enlarged to a recess with minimum dimensions of ¼ inch by ¼ inch (0.25" x 0.25") and sealed with an approved caulk or sealant applied over a sealant backer in accordance with the manufacturer's recommendations. C. For utility penetrations, work spaces and large slab openings, such as at a bath tub drain or a toilet flange, an acceptable method for sealing the exposed soil shall include fully covering the exposed soil with a solvent based plastic roof cement or other approved to a minimum depth of 1 inch. Where voids between masonry foundation walls and the slab edge are accessible, and are sealed in order to reduce vapor entry, non- shrinking cementitious material may be used. D. Any sump located in a conditioned portion of a building, or in an enclosed space directly attached to a conditioned portion of a building, shall be covered by a lid. An air tight seal shall be formed between the sump and lid and at any wire or pipe penetrations. - - - E N D - - - C h e c k e d : B . L u c a s S c a l e : N o n e D a t e : 9 - 2 1 - 1 1 F i g u r e : 1 0 5 1 1 3 2 6 P r o j e c t N u m b e r : C . M o r a n 0 5 1 3 2 6 1 5 - . d w g D r a w n : Informati o n To Build O n C h e c k e d : B . L u c a s S c a l e : N o n e D a t e : 9 - 2 1 - 1 1 F i g u r e : 2 0 5 1 1 3 2 6 P r o j e c t N u m b e r : C . M o r a n 0 5 1 3 2 6 1 5 - . d w g D r a w n : Informati o n To Build O n C h e c k e d : B . L u c a s S c a l e : N o n e D a t e : 1 1 - 2 2 - 1 1 F i g u r e : 3 0 5 1 1 3 2 6 P r o j e c t N u m b e r : C . M o r a n 0 5 1 3 2 6 1 5 - . d w g D r a w n : Informati o n To Build O n Description FlorprufeTM 120 is a high performance vapor barrier with Grace’s Advanced Bond TechnologyTM that forms a unique seal to the underside of concrete floor slabs. Comprising a highly durable polyolefin sheet and a specially developed, non-tacky adhesive coating, Florprufe 120 seals to liquid concrete to provide integrally bonded vapor protection. Florprufe exceeds ASTM E1745 Class A rating. Advantages •Forms a powerful integral seal to the underside of concrete slabs •Protects valuable floor finishes such as wood, tiles, carpet and resilient flooring from damage by vapor transmission •Direct contact with the slab complies with the latest industry recommendations •Remains sealed to the slab even in cases of ground settlement •Ultra low vapor permeability •Durable, chemical resistant polyolefin sheet •Lightweight, easy to apply, kick out rolls •Simple lap forming with mechanical fixings or tape Use Florprufe 120 is engineered for use below slabs on grade with moisture-impermeable or moisture-sensitive floor finishes that require the highest level of vapor protection. Florprufe complies with the latest recommendations of ACI Committees 302 and 360, i.e. for slabs with vapor sensitive coverings, the location of the vapor barrier should always be in direct contact with the slab1. The membrane is loose laid onto the prepared sub-base, forming overlaps that can be either mechanically secured or taped. The unique bond of Florprufe to concrete provides continuity of vapor protection at laps. Alternatively, if a taped system is preferred, self-adhered Preprufe®Tape can be used to overband the laps. Slab reinforcement and concrete can be placed immediately. Once the concrete is poured, an integral bond develops between the concrete and membrane. FlorprufeTM 120 Integrally bonded vapor protection for slabs on grade V apor Barrier Membranes www.graceconstruction.com PRODUCT DATA UPDATES TECH LETTERS DETAILS MSDS CONTACTS FAQS 1 ACI 302.1R-96 Addendum Building wall Exterior grade at or below level of subgrade – slope away from structure Footing Moisture sensitive flooring Concrete slab Florprufe 5 in. x 8 in. open drain rock Compacted subgrade Typical Assembly Expansion board (optional) Preprufe Tape Bituthene Liquid Membrane Physical Properties: Exceeds ASTM E1745 Class A rating Property Typical Value Test Method Color White Thickness (nominal) 0.5 mm (0.021 in.)ASTM D3767 – Method A Water Vapor Permeance 0.03 perms ASTM E96 – Method B1 Tensile Strength 68 lbs/in.ASTM E1541 Elongation 300%ASTM D412 Puncture Resistance 3300 gms ASTM D17091 Peel Adhesion to Concrete >4 lbs/in.ASTM D903 1. Test methods that comprise ASTM E1745 standard for vapor retarders Supply Florprufe 120 Supplied in rolls 1.2 m x 35 m (4 ft x 115 ft) Roll area 42 m 2 (460 ft2) Roll weight 37 kg (81 lbs) approx. Ancillary Products Preprufe Tape is packaged in cartons containing 4 rolls that are 100 mm x 15 m (4 in. x 49 ft). Bituthene Liquid Membrane is supplied in 5.7 L (1.5 gal) pails. W. R. Grace & Co.-Conn.62 Whittemore Avenue Cambridge, MA 02140 Florprufe is a trademark and Preprufe is a registered trademark of W. R. Grace & Co.-Conn. We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for the users’ consideration, investigationand verification, but we do not warrant the results to be obtained. Please read all statements, recommendations or suggestions in conjunction with our conditions of sale,which apply to all goods supplied by us. No statement, recommendation or suggestion is intended for any use which would infringe any patent or copyright. W. R. Grace & Co.-Conn., 62 Whittemore Avenue, Cambridge, MA 02140. In Canada, Grace Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6. These products may be covered by patents or patents pending. Copyright 2003. W. R. Grace & Co.-Conn. PF-001B Printed in USA 4/03 FA/GPS/2M Visit our web site at www.graceconstruction.com printed on recycled paper For Technical Assistance call toll free at 866-333-3SBM (3726). Installation Health & Safety Refer to relevant Material Safety Data Sheet. Complete rolls should be handled by 2 persons. Florprufe 120 can be applied at temperatures of -4ºC (25ºF) or above. Membrane installation is unaffected by wet weather. Installation and detailing of Florprufe 120 are generally in accordance with ASTM E1643-98. Prepare substrate in accordance with ACI 302.1R Section 4.1. Install Florprufe 120 over the leveled and compacted base. Place the membrane with the smooth side down and the plastic liner side up facing towards the concrete slab. Remove and discard plastic liner. End laps should be staggered to avoid a build up of layers. Succeeding sheets should be accurately positioned to overlap the previous sheet 50 mm (2 in.) along the marked lap line. Laps 1. Mechanical fastening method – To prevent the membrane from moving and gaps opening, the laps should be fastened together at 1.0 m (39 in.) maximum centers. Fix through the center of the lap area using 12 mm (0.5 in.) long washer- head, self-tapping, galvanized screws (or similar) and allowing the head of the screw to bed into the adhesive compound to self- seal. It is not necessary to fix the membrane to the substrate, only to itself. Ensure the membrane lays flat and no openings occur. (See Figure 1.) Additional fastening may be required at corners, details, etc. Continuity is achieved once the slab is poured and the bond to concrete develops. OR 2. Taped lap method – For additional security use Grace Preprufe Tape to secure and seal the overlaps. Overband the lap with the 100 mm (4 in.) wide Preprufe Tape, using the lap line for alignment. Remove plastic release liner to ensure bond to concrete. Penetrations Mix and apply Bituthene Liquid Membrane detailing compound to seal around penetrations such as drainage pipes, etc. (See Figure 2 and refer to the Bituthene Liquid Membrane data sheet, BIT-230.) Concrete Placement Place concrete within 30 days. Inspect membrane and repair any damage with patches of Preprufe Tape. Ensure all liner is removed from membrane and tape before concreting. Preprufe Tape Bituthene Liquid Membrane Florprufe Figure 2 Figure 1 JLB Partners, LLC Sub-Slab Vapor Sampling Work Plan,-Charlotte NC PSI Project No: 0457116 April 13, 2012 Page 8 of 8 APPENDIX - B 0 4 5 7 1 1 6 1 S i t e A r e a s a n d B o r i n g L o c a t i o n s I n f o r m a t i o n T o B u i l d O n Engineering Con s u l t i n g T e s t i n g P r o p o s e d T r a n s i t - O r i e n t e d , M u l t i - F a m i l y R e s i d e n t i a l P r o j e c t 1 4 0 R e m o u n t R o a d C h a r l o t t e , N o r t h C a r o l i n a C h e c k e d : S c a l e : 1 " = 1 2 0 ' B . L u c a s D r a w n : C . M o r a n 0 4 5 7 1 1 6 - 3 . d w g P r o j e c t N u m b e r : 3 - 8 - 1 2 D a t e : F i g u r e : AREA-1 A R E A - 2 AREA-5 A R E A - 6 A R E A - 3 A R E A - 4 0 4 5 7 1 1 6 2 S o i l S a m p l e L o c a t i o n / P r o p o s e d E x c a v a t i o n P l a n I n f o r m a t i o n T o B u i l d O n Engineering Con s u l t i n g T e s t i n g P r o p o s e d T r a n s i t - O r i e n t e d , M u l t i - F a m i l y R e s i d e n t i a l P r o j e c t 1 4 0 R e m o u n t R o a d C h a r l o t t e , N o r t h C a r o l i n a C h e c k e d : S c a l e : 1 " = 6 0 ' B . L u c a s D r a w n : C . M o r a n 0 4 5 7 1 1 6 - 3 . d w g P r o j e c t N u m b e r : 3 - 8 - 1 2 D a t e : F i g u r e : AREA-1-SS-3SW-2 ( 2 5 ' - S S = 3 ) AREA-1-SS-3SW-1 A ( 1 5 ' - S S = 3 ) AREA-1-SS-3SW - 1 ( 1 0 ' - S S = 3 ) A R E A - 1 - S S - 3 AREA-1-SS-3 N W - 1 ( 1 0 ' - S S = 3 ) P R O P O S E D E X C A V A T I O N L I M I T S Ta b l e 1 : G r e e n S p a c e C o n f i r m a t o r y S o i l A n a l y t i c a l D a t a S u m m a r y ( V O C a n d S V O C D e t e c t e d P a r a m e t e r s O n l y ) No r t h e a s t Q u a d r a n t o f R e m o u n t R o a d a n d D u n v a n a t S t r e e t 82 6 0 C - VO C s 82 6 0 C - VO C s 82 6 0 C - VO C s 82 6 0 C - VO C s 82 6 0 C - VO C s 82 6 0 C - VO C s 82 7 0 D - SV O C s 82 7 0 D - SV O C s 82 7 0 D - SV O C s 82 7 0 D - SV O C s 82 7 0 D - SV O C s 82 7 0 D - SV O C s 82 7 0 D - SV O C s 8270D - SVOCs8270D - SVOCs8270D - SVOCs8270D - SVOCs8270D - SVOCs8270D - SVOCs8270D - SVOCs8270D - SVOCs8270D - SVOCs8270D - SVOCs Bo r i n g Lo c a t i o n Sa m p l e I D Da t e Co l l e c t e d (m / d d / y y ) Sa m p l e De p t h (f t B G S ) AR E A - 1 A R E A - 1 - C S - 1 2 / 1 4 / 2 0 1 2 0 ' - 2 ' N A F N A F N A F N A F N A F N A F 1 . 7 2 . 4 4. 4 3 . 3 6 . 1 1. 3 1.9 1.8 4 . 1 0.42 J 0.91 8 . 4 1 . 8 1.7 1.2 8 . 1 6 . 8 AR E A - 1 A R E A - 1 - S S - 1 2 / 1 4 / 2 0 1 2 0 ' - 2 ' < 0 . 0 1 9 < 0 . 0 0 0 6 4 < 0 . 0 0 0 6 4 < 0 . 0 0 1 0 < 0 . 0 0 0 8 0 < 0 . 0 0 0 7 2 < 0 . 1 0 < 0 . 1 0 < 0 . 1 0 < 0 . 1 2 < 0 . 1 2 < 0 . 0 9 1 < 0 . 1 3 < 0 . 1 0 < 0 . 1 0 < 0 . 0 9 0 < 0 . 1 0 < 0 . 0 9 0 < 0 . 1 2 < 0 . 0 9 0 < 0 . 0 9 0 < 0 . 1 0 < 0 . 1 3 AR E A - 1 A R E A - 1 - S S - 2 2 / 1 4 / 2 0 1 2 0 ' - 2 ' S N A S N A S N A S N A S N A S N A < 0 . 1 0 < 0 . 1 0 < 0 . 1 0 < 0 . 1 2 < 0 . 1 2 < 0 . 0 9 0 < 0 . 1 3 < 0 . 1 0 < 0 . 1 0 < 0 . 0 9 1 < 0 . 1 0 < 0 . 0 9 1 < 0 . 1 2 < 0 . 0 9 1 < 0 . 0 9 1 < 0 . 1 0 < 0 . 1 3 AR E A - 1 A R E A - 1 - S S - 3 2 / 1 4 / 2 0 1 2 0 ' - 2 ' S N A S N A S N A S N A S N A S N A 0 . 1 5 J 0 . 2 4 0. 4 6 0 . 3 7 0 . 5 8 0. 1 8 J 0 . 2 3 0 . 1 8 J 0 . 4 6 < 0 . 0 9 0 < 0 . 1 0 1 0 . 1 4 J 0.21 J 0.094 J 0 . 8 2 0 . 7 3 AR E A - 1 A R E A - 1 - S S - 3 - N W - 1 2 / 2 2 / 2 0 1 2 0 . 8 ' - 2 ' N A F N A F N A F N A F N A F N A F < 0 . 1 1 < 0 . 1 1 < 0 . 1 1 < 0 . 1 2 < 0 . 1 2 < 0 . 0 9 3 < 0 . 1 3 < 0 . 1 1 < 0 . 1 1 < 0 . 0 9 3 < 0 . 1 1 < 0 . 0 9 3 < 0 . 1 2 < 0 . 0 9 3 < 0 . 0 9 3 < 0 . 1 1 < 0 . 1 3 AR E A - 1 A R E A - 1 - S S - 3 - S W - 1 2 / 2 2 / 2 0 1 2 0 . 8 ' - 2 ' N A F N A F N A F N A F N A F N A F 0 . 1 9 J 0 . 3 3 0. 8 2 1 . 1 1 . 5 1. 2 0 . 4 7 0 . 2 3 0 . 7 3 0.28 <0.10 1 . 6 0 . 1 5 J 1.3 <0.091 1 . 2 2 AR E A - 1 A R E A - 1 - S S - 3 - S W - 1 A 2 / 2 2 / 2 0 1 2 0 . 8 ' - 2 ' N A F N A F N A F N A F N A F N A F < 0 . 1 0 < 0 . 1 0 0. 5 7 0 . 6 5 0 . 9 4 0. 2 9 0 . 3 9 < 0 . 1 0 0 . 5 9 < 0 . 0 9 0 < 0 . 1 0 0 . 4 9 < 0 . 1 2 0.32 <0.090 0 . 1 4 J 0 . 2 9 AR E A - 1 A R E A - 1 - S S - 3 - S W - 2 2 / 2 9 / 2 0 1 2 0 . 8 ' - 2 ' N A F N A F N A F N A F N A F N A F < 0 . 1 1 < 0 . 1 1 0 . 1 2 J < 0 . 1 2 0 . 1 3 J < 0 . 0 9 2 < 0 . 1 3 < 0 . 1 1 0 . 1 2 J < 0 . 0 9 2 < 0 . 1 1 0 . 2 1 J < 0 . 1 2 0 . 1 1 J < 0 . 0 9 2 0 . 1 5 J 0 . 2 1 J AR E A - 2 A R E A - 2 - C S - 1 2 / 1 4 / 2 0 1 2 0 ' - 2 ' N A F N A F N A F N A F N A F N A F < 0 . 1 0 < 0 . 1 0 < 0 . 1 0 < 0 . 1 1 < 0 . 1 1 < 0 . 0 8 9 < 0 . 1 3 < 0 . 1 0 < 0 . 1 0 < 0 . 0 8 9 < 0 . 1 0 < 0 . 0 8 9 < 0 . 1 1 < 0 . 0 8 9 < 0 . 0 8 9 < 0 . 1 0 < 0 . 1 3 AR E A - 2 A R E A - 2 - S S - 3 2 / 1 4 / 2 0 1 2 0 ' - 2 ' < 0 . 0 1 8 < 0 . 0 0 0 6 3 < 0 . 0 0 0 6 3 < 0 . 0 0 1 0 < 0 . 0 0 0 7 9 < 0 . 0 0 0 7 1 S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A AR E A - 3 A R E A - 3 - C S 2 / 1 5 / 2 0 1 2 0 ' - 2 ' N A F N A F N A F N A F N A F N A F < 0 . 0 9 8 < 0 . 0 9 8 < 0 . 0 9 8 < 0 . 1 1 < 0 . 1 1 < 0 . 0 8 5 < 0 . 1 2 < 0 . 0 9 8 < 0 . 0 9 8 < 0 . 0 8 5 < 0 . 0 9 8 < 0 . 0 8 5 < 0 . 1 1 < 0 . 0 8 5 < 0 . 0 8 5 < 0 . 0 9 8 < 0 . 1 2 AR E A - 3 A R E A - 3 - S S - 1 2 / 1 5 / 2 0 1 2 0 ' - 2 ' < 0 . 0 1 8 < 0 . 0 0 0 6 1 < 0 . 0 0 0 6 1 < 0 . 0 0 0 9 8 < 0 . 0 0 0 7 6 < 0 . 0 0 0 6 8 S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A AR E A - 4 A R E A - 4 - C S 2 / 1 5 / 2 0 1 2 0 ' - 2 ' N A F N A F N A F N A F N A F N A F < 0 . 0 9 4 < 0 . 0 9 4 < 0 . 0 9 4 < 0 . 1 1 < 0 . 1 1 < 0 . 0 8 2 < 0 . 1 2 < 0 . 0 9 4 < 0 . 0 9 4 < 0 . 0 8 2 < 0 . 0 9 4 < 0 . 0 8 2 < 0 . 1 1 < 0 . 0 8 2 < 0 . 0 8 2 < 0 . 0 9 4 < 0 . 1 2 AR E A - 4 A R E A - 4 - S S - 1 2 / 1 5 / 2 0 1 2 0 ' - 2 ' < 0 . 0 2 6 < 0 . 0 0 0 9 0 < 0 . 0 0 0 9 0 < 0 . 0 0 1 5 < 0 . 0 0 1 1 < 0 . 0 0 1 0 S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A AR E A - 5 A R E A - 5 - C S - 1 2 / 1 4 / 2 0 1 2 0 ' - 2 ' N A F N A F N A F N A F N A F N A F < 0 . 1 0 < 0 . 1 0 < 0 . 1 0 < 0 . 1 2 < 0 . 1 2 < 0 . 0 9 1 < 0 . 1 3 < 0 . 1 0 < 0 . 1 0 < 0 . 0 9 1 < 0 . 1 0 < 0 . 0 9 1 < 0 . 1 2 < 0 . 0 9 1 < 0 .091 < 0 . 1 0 < 0 . 1 3 AR E A - 5 AR E A - 5 - S S - 1 2 / 1 4 / 2 0 1 2 0 ' - 2 ' 0 . 0 2 2 J 0 . 0 0 1 2 J < 0 . 0 0 0 6 0 0 . 0 0 2 9 0 . 0 0 0 7 8 J 0 . 0 1 2 S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A AR E A - 5 A R E A - 5 - S S - 6 2 / 1 4 / 2 0 1 2 0 ' - 2 ' < 0 . 0 2 0 < 0 . 0 0 0 6 9 < 0 . 0 0 0 6 9 < 0 . 0 0 1 1 < 0 . 0 0 0 8 6 < 0 . 0 0 0 7 7 S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A AR E A - 6 A R E A - 6 - C S - 1 2 / 1 4 / 2 0 1 2 0 ' - 2 ' N A F N A F N A F N A F N A F N A F < 0 . 1 0 < 0 . 1 0 < 0 . 1 0 < 0 . 1 2 < 0 . 1 2 < 0 . 0 9 0 < 0 . 1 3 < 0 . 1 0 < 0 . 1 0 < 0 . 0 9 0 < 0 . 1 0 < 0 . 0 9 0 < 0 . 1 2 < 0 . 0 9 0 < 0 . 0 9 0 < 0 . 1 0 < 0 . 1 3 AR E A - 6 A R E A - 6 - S S - 1 2 / 1 4 / 2 0 1 2 0 ' - 2 ' < 0 . 0 1 9 < 0 . 0 0 0 6 6 0 . 0 1 < 0 . 0 0 1 1 < 0 . 0 0 0 8 3 < 0 . 0 0 0 7 5 S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A AR E A - 6 A R E R A - 6 - S S - 5 2 / 1 4 / 2 0 1 2 0 ' - 2 ' < 0 . 0 1 8 < 0 . 0 0 0 6 1 < 0 . 0 0 0 6 1 < 0 . 0 0 0 9 9 < 0 . 0 0 0 7 6 < 0 . 0 0 0 6 8 S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A S N A 12 , 0 0 0 3 2 N E 0 . 5 5 0 6 4 0 0 . 8 8 6 8 0 3 , 4 0 0 0 . 1 5 0 . 0 1 5 0 . 3 8 N E 1 . 5 N E 1 5 0 . 0 1 5 1 6 4 6 0 4 6 0 0 . 1 5 3 . 6 N E 3 4 0 NO T E S 9. N E = N o t e s t a b l i s h e d 10 . N A F = N o t a n a l y z e d f o r 3. N C D E N R = N o r t h C a r o l i n a D e p a r t m e n t o f E n v i r o n m e n t a n d N a t u r a l R e s o u r c e s 6. S V O C s = s e m i - v o l a t i l e o r g a n i c c o m p o u n d s BO L D 7. < = l e s s t h a n t h e s t a t e d m e t h o d d e t e c t i o n l i m i t 8. S R G s = s o i l r e m e d i a t i o n g o a l s 1. f t . B G S = f e e t b e l o w g r o u n d s u r f a c e 4. I H S B = I n a c t i v e H a z a r d o u s S i t e B r a n c h 5. V O C s = v o l a t i l e o r g a n i c c o m p o u n d s 2. R e s u l t s r e p o r t e d i n m g / k g = m i l l l i g r a m s p e r k i l o g r a m Re s u l t s M e e t o r E x c e e d t h e N C D E N R - I H S B P r e l i m i n a r y R e s i d e n t i a l H e a l t h - B a s e d S R G s ( R e s i d e n t i a l P S R G ) 12 . J = D e t e c t e d b u t b e l o w t h e R e p o r t i n g L i m i t ( l o w e s t c a l i b r a t i o n s t a n d a r d ) ; t h e r e f o r e , r e s u l t i s a n e s t i m a t e d c o n c e n t r a t i o n ( C L P J - F l a g ) PhenanthrenePyrene NC D E N R - I H S B P r e l i m i n a r y R e s i d e n t i a l H e a l t h - B a s e d S R G s (J a n u a r y 2 0 1 2 ) Fluorene A c e n a p h t h e n e Dibenz(a,h)anthracene Naphthalene Dibenzofuran Fluoranthene Indeno(1,2,3-cd)pyrene A n t h r a c e n e B e n z o ( b ) f l u o r a n t h e n e B e n z o ( a ) a n t h r a c e n e B e n z o ( a ) p y r e n e Pr o p o s e d S o u t h l i n e M u l t i - F a m i l y D e v e l o p m e n t Ch a r l o t t e , M e c k l e n b u r g C o u n t y , N o r t h C a r o l i n a PS I P r o j e c t N o . 0 4 5 7 - 1 1 6 An a l y t i c a l M e t h o d Co n t a m i n a n t o f C o n c e r n T r i c h l o r o e t h y l e n e A c e t o n e c i s - 1 , 2 - D i c h l o r o e t h y l e n e T e t r a c h l o r o e t h y l e n e p - I s o p r o p y l t o l u e n e ( p - C y m e n e ) 1 , 1 , 1 - T r i c h l o r o e t h a n e 11 . S N A = S a m p l e N o t A n a l y z e d Carbazole B e n z o ( k ) f l u o r a n t h e n e B e n z o ( g , h , i ) p e r y l e n e Chrysene Professional Service Industries, Inc. ● 5021 West W.T. Harris Boulevard, Charlotte, NC 28269 ● Phone 704/598-2234 ● Fax 704/598-2236 JLB Realty LLC. – Southline Development Page 2 of 3 Charlotte, North Carolina PSI Project Number: 511-326 and groundwater samples were collected and analyzed for volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), and Resource Conservation and Recovery Act (RCRA) 8 Metals on various parcels of the subject property. The analytical results of the soil samples collected on the subject site indicated that two areas on the site had concentrations of total chromium above the Inactive Hazardous Site Branch (IHSB) Soil Remediation Goals (SRGs). Soil sample OA-SB-2 collected at 2‘ below ground surface had 28 ppm of total chromium; soil sample RR-SB-3 collected at 2’-4’ below ground surface had 47 ppm of total chromium. At the time of the sampling event, the SRG for chromium was 27 ppm. Recently, IHSB has created an SRG for the individual species of chromium. The soil samples where total chromium impact was present were not laboratory analyzed for the individual species of chromium. SOIL SAMPLING ACTIVITIES In order to speciate the chromium present at the site, on September 7, 2011, PSI collected two (2) soil samples on the subject property in the areas where chromium was formerly detected above the IHSB SRGs. The soil samples were collected at approximately the same locations and depths of the original soil samples analyzed. The soil samples were analyzed for total chromium by Environmental Protection Agency (EPA) Method 6010 and hexavalent chromium (chromium VI) by EPA Method 7196, The concentration of chromium III is them determined by subtracting the concentration of hexavalent chromium from total chromium. The approximate locations of the soil samples are depicted on Figure 1. Quality Assurance/Quality Control Measures All field decontamination procedures were performed in general accordance with the NCDENR standard operating procedures (SOPs) for field activities. The hand auger equipment was decontaminated using a solution of Alconox with alternate rinses of deionized water and isopropyl alcohol. Single-use disposable gloves were used for each sampling point to prevent cross-contamination between sampling locations. Laboratory analytical procedures were performed by National Environmental Laboratory Accreditation Conference (NELAC)-certified Con-Test Analytical Laboratory. Con-Test is located in East Longmeadow, Massachusetts. SOIL SAMPLING RESULTS The laboratory analytical results for Soil Sample SB-1-SS-1 2’-4’ indicated the presence of total chromium at a concentration of 30 milligrams per kilogram (mg/kg). This concentration does not exceed its IHSB Residential SRG of 24,000 mg/kg. Hexavalent chromium was not detected above its laboratory method detection limit (LMDL) of 1.3 mg/kg; however, the detection limit exceeds the ISHB SRG of 0.29 mg/kg. The laboratory analytical results for the Soil Sample SB-2-SS-1 1.5’-2.5’ indicated the presence of total chromium at a concentration of 140 mg/kg. Hexavalent chromium was not detected above its LMDL of 1.3 mg/kg; however, the detection limit exceeds the ISHB SRG of 0.29 mg/kg. A copy of the laboratory analytical results is included as Attachment A. JLB Realty LLC. – Southline Development Page 3 of 3 Charlotte, North Carolina PSI Project Number: 511-326 CONCLUSIONS Based on the results of the soil analysis, chromium III was not present at concentrations exceeding its respective IHSB SRG.. Hexavalent chromium was not present in amounts exceeding the method detection limit (1.3 mg/kg) achievable by the lab. Elevated detection limits were provided by the lab due to color interference as described in a letter prepared by Con-Test Analytical Laboratory and provided as an attachment to this letter. Hexavalent chromium analysis (EPA Method 7196) is a color-based analysis. Per conversation with Mr. Damboragian of Con-Test, lower detection limits for hexavalent chromium are not achievable for the suspect soil at the subject site. PSI appreciates the opportunity to be of service to you on this project. If you have any questions, or require additional information, please feel free to contact us at (704) 598-2234. Sincerely, PROFESSIONAL SERVICE INDUSTRIES, INC. FIGURE North Project Name: Not to scale, locations are approximate Proposed Southline Multi-Family Development Remount Road and Dunavant Street Charlotte, Mecklenburg County, North Carolina Project No.: Date: 0511326 September 22, 2011 Figure 1 Chromium Soil Sample Locations Map TA B L E 1 PR E V I O U S E N V I R O N M E N T A L D U E D I L I G E N C E R E P O R T S CH E R O K E E S O U T H L I N E - T R A N S I T O R I E N T E D D E V E L O P M E N T SO U T H B O U L E V A R D A R E A , C H A R L O T T E , N O R T H C A R O L I N A FO R M E R O R C U R R E N T OC C U P A N T AC R E A G E * PR E V I O U S P H A S E I E S A RE P O R T S B Y E R M ( D A T E ) PR E V I O U S P H A S E I I E S A RE P O R T S B Y E R M ( D A T E ) 1A . 14 0 R e m o u n t R o a d Va c a n t 3. 0 1 P h a s e I E S A , 5 / 1 5 / 0 6 Ph a s e I I E S A , 1 2 / 0 6 ( f o r m e r B e l l P r o p e r t y ) Ph a s e I E S A U p d a t e , 1 0 / 1 2 / 0 6 Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 1B . 2 5 1 7 D u n a v a n t S t r e e t Va c a n t 0. 6 2 P h a s e I E S A , 1 / 2 4 / 0 8 (f o r m e r B e l l P r o p e r t y P a r c e l # 2 ) 2. 2 4 1 5 & 2 4 1 8 D u n a v a n t S t r e e t Va c a n t 1 . 1 3 P h a s e I E S A , 5 / 1 5 / 0 6 Ph a s e I I E S A , 1 2 / 0 6 (f o r m e r P e g r a m P r o p e r t y ) & 0 . 5 5 P h a s e I E S A U p d a t e , 1 0 / 1 2 / 0 6 Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 3. 2 4 0 5 D u n a v a n t S t r e e t Ge l b a c h D e s i g n s 0. 6 7 P h a s e I E S A , 6 / 2 1 / 0 7 Ph a s e I E S A U p d a t e , 1 / 1 1 / 0 8 4. 2 4 0 1 D u n a v a n t S t r e e t Qu a l i t y T i l e & M a r b l e 0. 6 7 P h a s e I E S A , 1 1 / 1 6 / 0 5 P h a s e I I E S A , 1 2 / 0 6 Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 5. 2 3 2 1 D u n a v a n t S t r e e t Va c a n t 0. 7 0 P h a s e I E S A , 2 / 2 7 / 0 7 (S o u t h e r n C o m f o r t H V A C ) Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 6. 2 3 0 9 D u n a v a n t S t r e e t Fl o r a l T r e n d s 0. 9 0 P h a s e I E S A , 9 / 0 7 7. 2 3 0 3 D u n a v a n t S t r e e t Va c a n t 1. 2 4 P h a s e I E S A , 1 1 / 0 6 P h a s e I I E S A , 1 2 / 0 6 (f o r m e r O r n a m e n t a l A w n i n g s ) Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 8. 2 2 3 5 H a w k i n s S t r e e t Va c a n t 2. 1 3 P h a s e I E S A , 1 / 2 3 / 0 8 (f o r m e r M u r r a y S u p p l y ) 9. 2 2 0 5 D u n a v a n t S t r e e t Va c a n t 1. 2 2 P h a s e I E S A , 1 1 / 0 6 P h a s e I I E S A , 1 2 / 0 6 ( f o r m e r P r e s s l e y S e r v i c e s ) Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 10 . 2 3 0 0 S o u t h B o u l e v a r d Va c a n t 2. 4 0 P h a s e I E S A , 9 / 2 5 / 0 6 P h a s e I I E S A , 1 2 / 0 6 (f o r m e r W e l d e r s S u p p l y ) Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 11 . 2 3 1 6 S o u t h B o u l e v a r d Va c a n t 1 . 2 6 P h a s e I E S A , 5 / 1 6 / 0 6 Ph a s e I I E S A , 1 2 / 0 6 (f o r m e r R a l p h J o n e s / Ph a s e I E S A U p d a t e , 1 0 / 1 2 / 0 6 Ge o r g i a - C a r o l i n a C h e m i c a l s ) Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 12 . 2 4 0 0 S o u t h B o u l e v a r d Va c a n t 1. 7 8 P h a s e I E S A , 5 / 1 5 / 0 6 Ph a s e I I E S A , 1 2 / 0 6 (f o r m e r M c D o n a l d s ) Ph a s e I E S A U p d a t e , 1 0 / 1 2 / 0 6 Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 13 . 2 5 0 0 S o u t h B o u l e v a r d Ha r r i s T i r e C o m p a n y 1. 6 4 P h a s e I E S A , 1 0 / 1 1 / 0 7 14 . 2 5 0 8 & 2 5 2 2 S o u t h B o u l e v a r d Va c a n t 1 . 1 6 P h a s e I E S A , 5 / 1 5 / 0 6 Ph a s e I I E S A , 1 2 / 0 6 ( f o r m e r d r y c l e a n e r s & 0 . 7 4 P h a s e I E S A U p d a t e , 1 0 / 1 2 / 0 6 & g a s s t a t i o n ) Ph a s e I E S A U p d a t e , 1 / 2 8 / 0 8 * - I n f o r m a t i o n p e r M e c k l e n b u r g C o u n t y G I S r e c o r d s 1 / 0 8 SI T E L O C A T I O N Ch e r o k e e S o u t h l i n e \ T a b l e s P h a s e I I A d d e n d u m 2 0 0 6 - 2 0 0 8 . x l s \ P r e v i o u s R e p o r t s TA B L E 2 MO N I T O R W E L L C O N S T R U C T I O N CH E R O K E E S O U T H L I N E T R A N S I T - O R I E N T E D D E V E L O P M E N T SO U T H B O U L E V A R D A R E A CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Page 1 of 2 Pr o p e r t y Lo c a t i o n / Mo n i t o r W e l l I D Da t e In s t a l l e d Da t e W a t e r Le v e l Me a s u r e d We l l C a s i n g De p t h (f e e t B G S ) Sc r e e n e d In t e r v a l (f e e t B G S ) Bo t t o m o f W e l l (f e e t B G S ) Gr o u n d S u r f a c e El e v a t i o n (f e e t ) To p - o f - C a s i n g Ele v a t i o n (f e e t ) De p t h t o W a t e r (f e e t B G S ) De p t h t o W a t e r (f e e t B T O C ) Gr o u n d W a t e r El e v a t i o n (fe e t ) Fr e e P r o d u c t Th i c k n e s s (f e e t ) C o m m e n t s 14 0 R e m o u n t R o a d ( B e l l P r o p e r t y ) MW - 1 1 2 / 2 8 / 0 7 1 / 3 / 0 8 15 15 - 3 0 30 74 2 . 8 3 7 4 2 . 1 6 2 0 . 2 8 1 9 . 6 1 7 2 2 . 5 5 N o n e 2 " P V C p e r m a n e n t m o n i t o r w e l l flush-mount RR - G W - 2 1 0 / 1 6 / 0 6 1 0 / 1 8 / 0 6 9 9- 2 4 24 -- -- 17 . 1 8 1 8 . 7 3 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 RR - G W - 4 1 0 / 1 6 / 0 6 1 0 / 1 8 / 0 6 1 4 14 - 2 4 24 -- -- 16 . 2 0 1 7 . 9 0 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 RR - G W - 5 1 0 / 1 6 / 0 6 1 0 / 1 8 / 0 6 1 4 14 - 2 4 24 -- -- 18 . 6 7 1 8 . 9 2 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 24 1 5 / 2 4 1 8 D u n a v a n t S t r e e t ( P e g r a m P r o p e r t i e s ) PP - G W - 1 1 0 / 1 6 / 0 6 1 0 / 1 9 / 0 6 9 . 0 9- 2 4 24 . 0 -- -- 15 . 8 7 1 6 . 0 7 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 PP - G W - 3 1 0 / 1 6 / 0 6 1 0 / 1 9 / 0 6 1 6 . 0 16 - 2 6 26 . 0 -- -- 13 . 4 3 1 4 . 8 3 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 24 0 1 D u n a v a n t S t r e e t ( Q u a l i t y M a r b l e & G r a n i t e ) QT M - G W - 2 10 / 2 0 / 0 6 1 1 . 6 1 1 . 6 - 2 6 . 6 2 6 . 6 -- -- 6. 7 6 6. 7 6 -- No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 23 2 1 D u n a v a n t S t r e e t ( S o u t h e r n C o m f o r t H V A C ) MW - 3 1 2 / 2 8 / 0 7 1 / 3 / 0 8 10 10 - 2 5 25 73 3 . 1 7 7 3 2 . 5 6 1 1 . 4 2 1 0 . 8 1 7 2 1 . 7 5 N o n e 2 " P V C p e r m a n e n t m o n i t o r w e l l flush-mount 23 0 3 D u n a v a n t S t r e e t ( O r n a m e n t a l A w n i n g s ) OA - G W - 1 1 0 / 1 6 / 0 6 1 0 / 2 0 / 0 6 9 . 0 0 11 - 2 1 21 -- -- 4. 8 0 5. 1 0 -- No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 OA - G W - 2 1 0 / 1 6 / 0 6 1 0 / 2 0 / 0 6 3 . 6 5 8- 1 8 18 . 0 -- -- 3. 8 5 4. 7 0 -- No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 22 3 5 H a w k i n s S t r e e t ( M u r r a y S u p p l y ) MW - 5 1 2 / 2 8 / 0 7 1 / 3 / 0 8 8 8- 2 3 23 72 7 . 9 7 7 2 7 . 4 2 7 . 5 8 7. 0 3 7 2 0 . 3 9 N o n e 2 " P V C p e r m a n e n t m o n i t o r w e l l flush-mount 22 0 5 D u n a v a n t S t r e e t ( P r e s s l e y S e r v i c e s ) MW - 4 1 2 / 2 8 / 0 7 1 / 3 / 0 8 15 15 - 3 0 30 73 2 . 5 8 7 3 1 . 7 7 1 7 . 5 8 1 6 . 7 7 7 1 5 . 0 0 N o n e 2 " P V C p e r m a n e n t m o n i t o r w e l l flush-mount PS - G W - 1 1 0 / 1 8 / 0 6 1 0 / 2 3 / 0 6 1 4 . 7 1 4 . 7 - 2 9 . 7 2 9 . 7 0 -- -- 16 . 2 7 1 6 . 9 2 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 PS - G W - 3 1 0 / 1 8 / 0 6 1 0 / 2 3 / 0 6 1 0 . 8 1 0 . 8 - 2 5 . 8 2 5 . 8 -- -- 17 . 7 4 1 8 . 1 9 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 23 0 0 S o u t h B o u l e v a r d ( W e l d e r s S u p p l y ) WS - G W - 1 1 0 / 1 7 / 0 6 1 0 / 1 9 / 0 6 1 9 19 - 3 4 34 -- -- 26 . 6 7 2 7 . 3 7 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 WS - G W - 2 1 0 / 1 7 / 0 6 1 0 / 1 8 / 0 6 2 0 20 - 4 0 40 -- -- 28 . 8 6 2 9 . 1 6 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 WS - G W - 4 1 0 / 1 7 / 0 6 1 0 / 1 9 / 0 6 1 4 14 - 2 4 24 -- -- 20 . 5 1 2 2 . 0 1 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 WS - G W - 5 1 0 / 1 9 / 0 6 1 0 / 2 3 / 0 6 1 6 . 5 1 6 . 5 - 2 6 . 5 2 6 . 5 2 -- -- 17 . 8 5 1 9 . 2 5 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 WS - G W - 6 1 0 / 1 7 / 0 6 1 0 / 2 3 / 0 6 1 9 . 8 1 9 . 8 - 2 9 . 8 2 9 . 8 5 -- -- 20 . 1 4 2 0 . 3 9 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 Ch e r o k e e S o u t h l i n e \ T a b l e s P h a s e I I A d d e n d u m 2 0 0 6 - 2 0 0 8 . x l s \ W e l l C o n s t TA B L E 2 MO N I T O R W E L L C O N S T R U C T I O N CH E R O K E E S O U T H L I N E T R A N S I T - O R I E N T E D D E V E L O P M E N T SO U T H B O U L E V A R D A R E A CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Page 2 of 2 Pr o p e r t y Lo c a t i o n / Mo n i t o r W e l l I D Da t e In s t a l l e d Da t e W a t e r Le v e l Me a s u r e d We l l C a s i n g De p t h (f e e t B G S ) Sc r e e n e d In t e r v a l (f e e t B G S ) Bo t t o m o f W e l l (f e e t B G S ) Gr o u n d S u r f a c e El e v a t i o n (f e e t ) To p - o f - C a s i n g Ele v a t i o n (f e e t ) De p t h t o W a t e r (f e e t B G S ) De p t h t o W a t e r (f e e t B T O C ) Gr o u n d W a t e r El e v a t i o n (fe e t ) Fr e e P r o d u c t Th i c k n e s s (f e e t ) C o m m e n t s 23 0 0 S o u t h B o u l e v a r d ( W e l d e r s S u p p l y ) c o n t i n u e d WS - G W - 8 1 0 / 1 9 / 0 6 1 0 / 2 3 / 0 6 1 6 . 6 1 6 . 6 - 2 6 . 6 2 6 . 6 0 -- -- 18 . 5 3 1 9 . 7 8 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 WS - G W - 9 1 0 / 1 7 / 0 6 1 0 / 2 3 / 0 6 1 5 . 4 1 5 . 4 - 2 5 . 4 2 5 . 4 4 -- -- 19 . 1 3 2 1 . 0 3 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 23 1 6 S o u t h B o u l e v a r d ( F o r m e r G e o r g i a C a r o l i n a P r o d u c t s C o m p a n y , I n c . ) RJ - G W - 1 1 0 / 1 8 / 0 6 1 0 / 2 3 / 0 6 1 9 . 4 1 9 . 4 - 3 4 . 4 3 4 . 4 -- -- 24 . 8 5 2 5 . 3 0 -- No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 RJ - G W - 2 1 0 / 1 9 / 0 6 1 0 / 2 3 / 0 6 1 4 . 5 1 4 . 5 - 2 9 . 5 2 9 . 5 -- -- 20 . 4 5 2 0 . 5 5 -- No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 RJ - G W - 3 1 0 / 1 9 / 0 6 1 0 / 2 3 / 0 6 1 0 . 9 1 0 . 9 - 2 5 . 9 2 5 . 9 -- -- 25 . 8 2 2 6 . 3 2 -- No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 MW - 1 U n k n o w n 1 0 / 1 8 / 0 6 U n k n o w n U n k n o w n 2 7 . 5 -- -- 24 . 4 24 . 6 4 -- No n e 2 " P V C p e r m a n e n t m o n i t o r w e l l (2 3 1 6 W e l l ) Abandoned on Sept. 28, 2007 24 0 0 S o u t h B o u l e v a r d ( F o r m e r M c D o n a l d ' s R e s t a u r a n t ) MW - 2 1 2 / 2 8 / 0 7 1 / 3 / 0 8 15 15 - 3 0 30 ~ 7 4 9 . 0 7 5 1 . 2 4 2 7 . 0 4 2 9 . 2 8 7 2 1 . 9 6 N o n e 2 " P V C p e r m a n e n t m o n i t o r w e l l above-grade well, ~ 2.2 ft stickup MD - G W - 1 1 0 / 1 9 / 0 6 1 0 / 2 0 / 0 6 1 9 . 6 1 9 . 6 - 3 4 . 6 3 4 . 6 -- -- 22 . 2 6 2 2 . 7 1 -- No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 MD - G W - 2 1 0 / 1 9 / 0 6 1 0 / 2 0 / 0 6 1 8 . 4 1 8 . 4 - 3 3 . 4 3 3 . 4 -- -- 20 . 8 9 2 1 . 4 9 -- No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 MD - G W - 3 1 0 / 1 9 / 0 6 1 0 / 2 0 / 0 6 1 0 . 2 1 0 . 2 - 2 0 . 2 2 0 . 2 -- -- DR Y DR Y DR Y No n e 1 " P V C t e m p o r a r y m o n i t o r w e l l Abandoned on Nov. 12, 2006 25 0 8 / 2 5 2 2 S o u t h B o u l e v a r d ( F o r m e r D r y C l e a n e r a n d G a s S t a t i o n P r o p e r t i e s ) MW - 1 3/ 1 6 / 0 5 4 / 5 / 0 5 1 3 . 0 1 3 . 0 - 2 3 . 0 2 3 . 0 -- -- -- 15 . 2 2 -- No n e E x i s t i n g w e l l i n s t a l l e d b y N C D E N R D S C A 11 / 3 0 / 0 5 -- -- -- 16 . 3 1 -- flush-mount MW - 2 3/ 1 6 / 0 5 4 / 5 / 0 5 1 2 . 0 1 2 . 0 - 2 2 . 0 2 2 . 0 -- -- -- 13 . 9 1 -- No n e E x i s t i n g w e l l i n s t a l l e d b y N C D E N R D S C A 11 / 3 0 / 0 5 -- -- -- 13 . 9 9 -- flush-mount MW - 3 3 / 1 6 / 0 5 4 / 5 / 0 5 1 4 . 0 1 4 . 0 - 2 4 . 0 2 4 . 0 7 3 7 . 5 6 7 3 7 . 3 7 1 5 . 6 4 1 5 . 4 5 7 2 1 . 9 2 N o n e E x i s t i n g w e l l i n s t a l l e d b y N C D E N R D S C A 11 / 3 0 / 0 5 17 . 3 9 1 7 . 2 0 7 2 0 . 1 7 flush-mount 1/ 3 / 0 8 18 . 6 1 1 8 . 4 2 7 1 8 . 9 5 MW - 4 1 1 / 2 9 / 0 5 1 1 / 3 0 / 0 5 1 5 . 0 1 5 . 0 - 2 5 . 0 2 5 . 0 -- -- -- 15 . 6 1 -- No n e E x i s t i n g w e l l i n s t a l l e d b y N C D E N R D S C A flush-mount MW - 5 1 1 / 2 9 / 0 5 1 1 / 3 0 / 0 5 1 3 . 0 1 3 . 0 - 2 3 . 0 2 3 . 0 7 3 6 . 7 4 7 3 6 . 1 1 1 7 . 5 0 1 6 . 8 7 7 1 9 . 2 4 N o n e E x i s t i n g w e l l i n s t a l l e d b y N C D E N R D S C A 1/ 3 / 0 8 19 . 1 6 1 8 . 5 3 7 1 7 . 5 8 flush-mount MW - 6 1 1 / 2 8 / 0 5 1 1 / 3 0 / 0 5 1 3 . 0 1 3 . 0 - 2 3 . 0 2 3 . 0 -- -- -- 15 . 8 2 -- No n e E x i s t i n g w e l l i n s t a l l e d b y N C D E N R D S C A flush-mount DW - 1 1 1 / 3 0 / 0 5 1 1 / 3 0 / 0 5 4 0 . 0 4 0 . 0 - 4 5 . 0 4 5 . 0 -- -- -- 14 . 6 9 -- No n e E x i s t i n g w e l l i n s t a l l e d b y N C D E N R D S C A flush-mount MW - 1 A 1 0 / 2 1 / 0 4 4 / 5 / 0 5 1 5 . 0 1 5 . 0 - 2 5 . 0 2 5 . 0 -- -- -- 14 . 9 8 -- No n e E x i s t i n g w e l l i n s t a l l e d b y N C D E N R D S C A 12 / 1 / 0 5 -- -- -- 15 . 7 5 -- flush-mount SB - G W - 1 1 0 / 1 6 / 0 6 1 0 / 1 8 / 0 6 2 0 20 ' - 3 0 ' 30 . 0 -- -- 16 . 6 3 1 8 . 7 1 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l . Abandoned on Nov. 12, 2006 SB - G W - 2 1 0 / 1 6 / 0 6 1 0 / 1 8 / 0 6 1 7 17 ' - 2 7 ' 27 . 0 -- -- 21 . 7 8 2 0 . 5 5 -- No n e 1 - i n c h P V C t e m p o r a r y m o n i t o r w e l l . Abandoned on Nov. 12, 2006 Ele v a t i o n s r e f e r e n c e d t o m e a n s e a l e v e l . C o n s t r u c t i o n d a t a r e g a r d i n g p e r m a n e n t m o n i t o r w e l l s a t 2 5 0 8 S o u t h B o u l e v a r d ( f o r m e r d r y c l e a n e r s ) o b t a i n e d f r o m S h i e l d E n g i n e e r i n g r e p o r t d a t e d J a n . 3 1 , 2 0 0 6 . Ch e r o k e e S o u t h l i n e \ T a b l e s P h a s e I I A d d e n d u m 2 0 0 6 - 2 0 0 8 . x l s \ W e l l C o n s t TA B L E 3 SU M M A R Y O F S O I L S A M P L I N G R E S U L T S CH E R O K E E S O U T H L I N E T R A N S I T - O R I E N T E D D E V E L O P M E N T SO U T H B O U L E V A R D A R E A CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Page 1 of 4 Pr o p e r t y Lo c a t i o n / Sa m p l e I D D a t e 14 0 R e m o u n t R o a d ( B e l l P r o p e r t y ) RR - S B - 1 1 0 / 1 6 / 0 6 0 . 2 5 - 2 . 0 3 1 . 3 37 0 ND - - - - 0 . 0 2 4 N D - - - - - - - - - - - - - - RR - S B - 2 1 0 / 1 6 / 0 6 2 - 4 < 1 N D N D - - - - N D N D - - - - - - - - - - - - - - RR - S B - 3 1 0 / 1 6 / 0 6 2 - 4 - - - - - - N D N D N D N D 0 . 5 1 J 3 0 1 . 8 47 18 0 . 0 8 9 J 0 . 0 4 8 MW - 1 1 / 3 / 0 8 1 4 - 1 6 - - - - - - N D N D N D N D - - - - - - - - - - - - - - 24 1 5 / 2 4 1 8 D u n a v a n t S t r e e t ( P e g r a m P r o p e r t i e s ) PP - S B - 1 10 / 1 6 / 0 6 4- 6 < 0 . 1 - - - - 0 . 0 5 6 N D N D N D - - - - - - - - - - - - -- PP - S B - 2 1 0 / 1 6 / 0 6 1 8 - 2 0 < 0 . 1 -- - - ND N D N D N D -- -- -- - - - - - - -- PP - S B - 3 1 0 / 1 8 / 0 6 2 - 4 < 0 . 1 -- - - 0. 0 6 9 N D N D N D -- -- -- - - - - - - -- 24 0 1 D u n a v a n t S t r e e t ( Q u a l i t y M a r b l e & G r a n i t e ) QT M - S B - 1 1 0 / 1 8 / 0 6 2 - 4 < 1 -- - - 0. 0 2 5 N D N D N D -- - - - - - - ------ QT M - S B - 2 1 0 / 1 8 / 0 6 2 - 4 < 1 -- - - ND N D N D N D -- - - - - - - ------ 23 0 3 D u n a v a n t S t r e e t ( F o r m e r O r n a m e n t a l A w n i n g s ) OA - S B - 1 1 0 / 1 6 / 0 6 1 3 3 1 . 3 -- - - N D N D N D N D 0. 5 7 J 9 8 0 . 3 6 J 3 . 5 2 . 6 N D 0 . 0 0 3 0 J OA - S B - 2 1 0 / 1 6 0 6 2 < 1 -- - - N D N D N D N D 3. 5 3 1 0 0 . 9 7 28 6.5 0 . 3 3 J 0 . 0 0 5 5 J 23 2 1 D u n a v a n t S t r e e t ( F o r m e r S o u t h e r n C o m f o r t H V A C ) No s o i l s a m p l e s c o l l e c t e d t o d a t e -- - - - - - - - - - - - - - - - - - - - - - - - - - - 22 3 5 H a w k i n s S t r e e t ( F o r m e r M u r r a y S u p p l y ) No s o i l s a m p l e s c o l l e c t e d t o d a t e -- - - - - - - - - - - - - - - - - - - - - - - - - - - 22 0 5 D u n a v a n t S t r e e t ( F o r m e r P r e s s l e y S e r v i c e s ) PS - S B - 1 1 0 / 1 8 / 0 6 2 - 4 < 1 -- - - ND N D 0 . 0 2 4 N D -- - - - - - - - - - - -- PS - S B - 2 1 0 / 1 8 / 0 6 1 2 - 1 4 1 . 7 -- - - ND N D N D N D -- -- -- - - - - - - -- PS - S B - 3 1 0 / 1 8 / 0 6 1 4 - 1 6 1 . 9 -- - - ND N D N D N D -- -- -- - - - - - - -- 23 0 0 S o u t h B o u l e v a r d ( F o r m e r W e l d e r s S u p p l y ) WS - S B - 3 1 0 / 1 7 / 0 6 6 - 8 < 1 16 ND -- - - - - - - - - - - - - - - - - - - -- WS - S B - 4 1 0 / 1 7 / 0 6 6 - 8 < 1 N D N D -- - - - - - - - - -- -- - - - - - - -- WS - S B - 6 1 0 / 1 7 / 0 6 8 - 1 0 2 . 0 - - - - 0 . 0 6 5 0 . 0 4 5 0 . 0 0 5 3 J N D -- -- -- - - - - - - -- WS - S B - 7 1 0 / 1 7 / 0 6 8 - 1 0 < 1 N D N D -- - - - - - - - - -- -- - - - - - - -- WS - S B - 9 1 0 / 1 7 / 0 6 2 - 4 < 1 0 - - - - 0 . 1 9 N D N D N D 2 . 1 1 1 0 0 . 4 0 J 36 26 0 . 1 2 J 0 . 0 3 WS - H A - 1 0 1 0 / 1 7 / 0 6 0 - 2 < 1 - - - - N D N D N D N D - - - - - - - - - - - - - - VO L A T I L E O R G A N I C C O M P O U N D S b y E P A 8 2 6 0 B ( m g / k g ) METALS M e t h o d s 6 0 1 0 B / 7 4 7 1 ( m g / k g ) Chromium (total)LeadSilverMercury TP H M e t h o d 8 0 1 5 B (m g / k g ) Gasoline Range Organics (GRO) Diesel Range Organics (DRO) Field Screening Volatile organic compounds - ppm (PID) De p t h (f e e t B G S ) Barium Cadmium Arsenic Acetone cis-1-2-Dichloroethene Trichlorofluoromethane All Other compounds Ch e r o k e e S o u t h l i n e \ T a b l e s P h a s e I I A d d e n d u m 2 0 0 6 - 2 0 0 8 . x l s \ S o i l - V O C s & M e t a l s TA B L E 3 SU M M A R Y O F S O I L S A M P L I N G R E S U L T S CH E R O K E E S O U T H L I N E T R A N S I T - O R I E N T E D D E V E L O P M E N T SO U T H B O U L E V A R D A R E A CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Page 2 of 4 Pr o p e r t y Lo c a t i o n / Sa m p l e I D D a t e VO L A T I L E O R G A N I C C O M P O U N D S b y E P A 8 2 6 0 B ( m g / k g ) METALS M e t h o d s 6 0 1 0 B / 7 4 7 1 ( m g / k g ) Chromium (total)LeadSilverMercury TP H M e t h o d 8 0 1 5 B (m g / k g ) Gasoline Range Organics (GRO) Diesel Range Organics (DRO) Field Screening Volatile organic compounds - ppm (PID) De p t h (f e e t B G S ) Barium Cadmium Arsenic Acetone cis-1-2-Dichloroethene Trichlorofluoromethane All Other compounds 23 1 6 S o u t h B o u l e v a r d ( F o r m e r G e o r g i a C a r o l i n a P r o d u c t s C o m p a n y , I n c . ) RJ - S B - 1 1 0 / 2 3 / 0 6 8 - 1 0 < 1 N D N D -- -- - - -- - - - - - - - - - - - - -- RJ - S B - 2 1 0 / 1 9 / 0 6 2 - 4 < 1 - - - - N D N D N D N D -- -- -- - - - - - - -- RJ - S B - 3 1 0 / 1 9 / 0 6 2 - 4 < 1 - - - - 0 . 0 5 6 ND N D ND -- -- -- - - - - - - -- Ge r o g i a - C a r - 1 * 9 / 2 8 / 0 7 1 2 . 0 < 1 N D 4 . 6 J -- - - - - - - - - - - - - - - - - - - - - Ge r o g i a - C a r - 2 * 9 / 2 8 / 0 7 1 2 . 0 < 1 N D 5 . 1 J -- - - - - - - - - - - - - - - - - - - - - Ge r o g i a - C a r - 3 * 9 / 2 8 / 0 7 1 2 . 0 < 1 N D 3 . 1 J -- - - - - - - - - - - - - - - - - - - - - 24 0 0 S o u t h B o u l e v a r d ( F o r m e r M c D o n a l d ' s R e s t a u r a n t ) MD - S B - 1 1 0 / 1 9 / 0 6 2 - 4 < 1 -- - - ND N D N D N D -- - - - - - - - - - - -- MD - S B - 2 1 0 / 1 9 / 0 6 2 - 4 < 1 -- - - 0. 1 2 N D N D N D -- -- -- - - - - - - -- MD - S B - 3 1 0 / 1 9 / 0 6 2 - 4 < 1 -- - - 0. 0 6 2 N D N D N D -- -- -- - - - - - - -- 25 0 8 / 2 5 2 2 S o u t h B o u l e v a r d ( F o r m e r D r y C l e a n e r a n d G a s S t a t i o n P r o p e r t i e s ) SB - S B - 1 1 0 / 1 6 / 0 6 2 - - - - - - 0 . 0 3 2 N D N D N D -- -- -- - - - - - - -- NC D E N R U S T S e c t i o n A c t i o n L e v e l 1 10 1 0 2 . 8 N E 7 8 N E N E 8 4 8 N E 2 7 2 7 0 N E N E NC D E N R I H S B R e m e d i a t i o n G o a l 2 -- - - 2 , 8 0 0 8 . 6 7 8 N E 4 . 4 N E 7 . 4 44 / 2 4 , 0 0 0 6 270 78 4 . 6 EP A R e g i o n 9 P R G R e s i d e n t i a l 3 NE N E 1 4 , 1 2 7 4 2 . 9 3 8 6 N E 0 . 3 8 9 6 5 , 3 7 5 3 7 . 0 2 1 1 4 0 0 3 9 1 6 . 1 1 EP A R e g i o n 9 P R G I n d u s t r i a l / C o m m e r c i a l 3 NE N E 5 4 , 3 2 1 1 4 6 . 3 2 , 0 0 0 N E 1 . 5 9 6 6 , 5 7 7 4 5 1 4 4 8 8 0 0 5 , 1 1 0 6 1 . 6 Na t u r a l l y O c c u r r i n g M e t a l s C o n c e n t r a t i o n 4 - M e a n -- - - - - - - - - - - 4 . 8 2 9 0 N E 3 3 1 4 N E 0 . 0 8 1 Na t u r a l l y O c c u r r i n g M e t a l s C o n c e n t r a t i o n 4 - R a n g e -- - - - - - - - - - - < 0 . 1 - 7 3 1 0 - 1 , 5 0 0 N E 1 - 1 , 0 0 0 < 1 0 - 3 0 0 N E 0 . 0 1 - 3 . 4 Tr a c e E l e m e n t C o n t e n t o f N a t u r a l S o i l s 5 - A v e r a g e -- - - - - - - - - - - 5 4 3 0 0 . 0 6 1 0 0 1 0 0 . 0 5 0 . 0 3 Tr a c e E l e m e n t C o n t e n t o f N a t u r a l S o i l s 5 - R a n g e -- - - - - - - - - - - 1 - 5 0 1 0 0 - 3 , 0 0 0 0 . 0 1 - 0 . 7 1 - 1 , 0 0 0 2 - 2 0 0 0 . 0 1 - 5 0 . 0 1 - 0 . 3 On l y d e t e c t e d c o m p o u n d s a r e s h o w n i n t a b l e NE = N o t e s t a b l i s h e d 1 - N C D E N R U S T S e c t i o n S o i l - t o - G r o u n d w a t e r M a x i m u m S o i l C o n t a m i n a n t C o n c e n t r a t i o n mg / k g = M i l l i g r a m s p e r k i l o g r a m - - = N o t A n a l y z e d 2 - N C D E N R I n a c t i v e H a z a r d o u s S i t e s B r a n c h R e m e d i a t i o n G o a l ( R G ) BG S = B e l o w g r o u n d s u r f a c e TP H = T o t a l P e t r o l e u m H y d r o c a r b o n s 3 - E P A R e g i o n 9 P r e l i m i n a r y R e m e d i a t i o n G o a l ND - N o t D e t e c t e d a t M e t h o d D e t e c t i o n L i m i t * - U S T / h y d r a u l i c l i f t c l o s u r e s a m p l e 4 - U S G S P r o f e s s i o n a l P a p e r 1 2 7 0 " E l e m e n t a l C o n c e n t r a t i o n s I n S o i l s a n d S u r f i c i a l M a t e r i a l s o f t h e C o n t e r m i n o u s J - E s t i m a t e d v a l u e b e t w e e n R e p o r t i n g L i m i t a n d U n i t e d S t a t e s " , H . T . S h a c k l e t t e a n d J . G . B o e r n g e n , 1 9 8 4 . V a l u e s f o r E a s t e r n U n i t e d S t a t e s p r e s e n t e d Me t h o d D e t e c t i o n L i m i t 5 - B a c k g r o u n d c o n c e n t r a t i o n s o f m e t a l s p e r T a b l e 6 . 4 6 o f E P A S W - 8 7 4 , p a g e 2 7 3 . 6 - C h r o m i u m I V / C h r o m i u m I I I V a l u e s Re s u l t s s h o w n i n b o l d e x c e e d R G l e v e l s o r S o i l - G r o u n d w a t e r C l e a n u p L e v e l , w h e r e a p p l i c a b l e Ch e r o k e e S o u t h l i n e \ T a b l e s P h a s e I I A d d e n d u m 2 0 0 6 - 2 0 0 8 . x l s \ S o i l - V O C s & M e t a l s TA B L E 3 SU M M A R Y O F S O I L S A M P L I N G R E S U L T S CH E R O K E E S O U T H L I N E T R A N S I T - O R I E N T E D D E V E L O P M E N T SO U T H B O U L E V A R D A R E A CH A R L O T T E , M E C K L E N B U R G C O U N T Y , N O R T H C A R O L I N A Page 3 of 4 Pr o p e r t y Lo c a t i o n / Sa m p l e I D D a t e 14 0 R e m o u n t R o a d ( B e l l P r o p e r t y ) RR - S B - 1 1 0 / 1 6 / 0 6 0 . 2 5 - 2 . 0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - RR - S B - 2 1 0 / 1 6 / 0 6 2 - 4 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - RR - S B - 3 1 0 / 1 6 / 0 6 2 - 4 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - MW - 1 1/ 3 / 0 8 1 4 - 1 6 N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D 23 0 0 S o u t h B o u l e v a r d ( F o r m e r W e l d e r s S u p p l y ) WS - S B - 3 1 0 / 1 7 / 0 6 6 - 8 -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - WS - S B - 4 1 0 / 1 7 / 0 6 6 - 8 -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - WS - S B - 6 1 0 / 1 7 / 0 6 8 - 1 0 N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D N D - - - - WS - S B - 7 1 0 / 1 7 / 0 6 8 - 1 0 -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - WS - S B - 9 1 0 / 1 7 / 0 6 2 - 4 -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - WS - H A - 1 0 1 0 / 1 7 / 0 6 0 - 2 0 . 1 3 J 0 . 7 2 1 . 1 2. 1 1 . 9 2 . 1 0. 7 8 1 . 4 2 . 3 0. 3 1 J 3. 9 0 . 5 1 1 0 . 4 9 3 . 7 3 N D - - - - US T S e c t i o n A c t i o n L e v e l 1 1. 7 8 . 2 1 , 0 0 0 0 . 3 4 0 . 0 9 1 1 . 2 6 , 7 0 0 1 2 3 8 0 . 1 7 2 8 0 4 4 3 . 3 0 . 5 8 6 0 2 9 0 V a r i e s V a r i e s V a r i e s NC D E N R I H S B R e m e d i a t i o n G o a l 2 11 . 2 7 4 0 4 , 4 0 0 0 . 0 2 2 0 . 0 2 2 0 . 2 2 N E 2 . 2 2 2 0 . 0 2 2 4 6 0 5 4 0 0 . 2 2 1 1 . 2 N E 4 6 0 V a r i e s V a r i e s V a r i e s EP A R e g i o n 9 P R G R e s i d e n t i a l 3 NE 3 , 6 8 2 21 , 8 9 6 0. 6 2 2 0. 0 6 2 2 0. 6 2 2 N E 6 . 2 2 6 2 . 1 0. 0 6 2 1 2 , 2 9 4 2 , 7 4 7 0. 6 2 2 5 5 . 9 N E 2 , 3 1 6 V a r i e s V a r i e s V a r i e s EP A R e g i o n 9 P R G I n d u s t r i a l / C o m m e r c i a l NE 29 , 2 1 9 10 0 , 0 0 0 2. 1 1 0 . 2 1 1 2 . 1 1 N E 2 1 . 1 2 1 1 0. 2 1 1 2 2 , 0 0 0 2 6 , 2 8 1 2. 1 1 1 8 8 N E 2 9 , 1 2 6 V a r i e s V a r i e s V a r i e s On l y d e t e c t e d c o m p o u n d s a r e s h o w n i n t a b l e J - E s t i m a t e d v a l u e b e t w e e n R e p o r t i n g L i m i t a n d M e t h o d D e t e c t i o n L i m i t mg / k g = M i l l i g r a m s p e r k i l o g r a m 1 - N C D E N R U S T S e c t i o n S o i l - t o - G r o u n d w a t e r M a x i m u m S o i l C o n t a m i n a n t C o n c e n t r a t i o n BG S = B e l o w g r o u n d s u r f a c e 2 - N C D E N R I n a c t i v e H a z a r d o u s S i t e s B r a n c h R e m e d i a t i o n G o a l ( R G ) ND - N o t D e t e c t e d a t M e t h o d D e t e c t i o n L i m i t 3 - E P A R e g i o n 9 P r e l i m i n a r y R e m e d i a t i o n G o a l NE = N o t e s t a b l i s h e d Re s u l t s s h o w n i n b o l d e x c e e d R G l e v e l s o r S o i l - G r o u n d w a t e r C l e a n u p L e v e l , w h e r e a p p l i c a b l e - - = N o t A n a l y z e d All Other Compounds Indeno(1,2,3,-od)pyrene De p t h (f e e t B G S ) Fluorene Chrysene Benzo(k)fluoranthene Anthracene Benzo(g,h,l)perylene Benzo(b)fluoranthene Benzo(a)pyrene Benzo(a)anthracene Acenaphthene VPH/EPH MADEP Methods (mg/kg)Extractable Petroleum Hydrocarbons (All Ranges)Pyrene Naphthalene SE M I - V O L A T I L E O R G A N I C C O M P O U N D S / P O L Y C Y C L I C A R O M A T I C H Y D R O C A R B O N S Me t h o d 8 2 7 0 ( m g / k g ) Volatile Petroleum Hydrocarbons (All Ranges)Phenanthrene Fluoranthene 2-Methylnaphthalene Dibenzo(a,h)anthracene Ch e r o k e e S o u t h l i n e \ T a b l e s P h a s e I I A d d e n d u m 2 0 0 6 - 2 0 0 8 . x l s \ S o i l s - S V O C s TABLE 3 SUMMARY OF SOIL SAMPLING RESULTS - UST CLOSURES CHEROKEE SOUTHLINE TRANSIT-ORIENTED DEVELOPMENT SOUTH BOULEVARD AREA CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA Page 4 of 4 Property Location / Sample ID Date 140 Remount Road (Bell Property) Heating Oil UST Closure Bell S-1 9/26/07 13.0 <0.1 ND 12 -- Bell S-2 9/26/07 13.0 <0.1 ND 2.2 J -- Bell S-3 9/26/07 13.0 <0.1 ND 2.8 J -- 2300 South Boulevard (Former Welders Supply) Gasoline UST Closure Welders GT-1 10/2/07 12.0 <1 ND ---- Welders GT-2 10/2/07 12.0 <1 ND ---- Welders GD 10/2/07 2.5 <1 ND ---- Fuel/Heating Oil UST Closure Welders HO-1 10/2/07 12.0 <1 ND 6.8 J -- Welders HO-2 10/2/07 12.0 <1 ND 8.1 -- 2316 South Boulevard (Former Georgia Carolina Products Company, Inc.) Fuel/Heating Oil UST Closure Gerogia-Car-1 9/28/07 12.0 <1 ND 4.6 J -- Gerogia-Car-2 9/28/07 12.0 <1 ND 5.1 J -- Gerogia-Car-3 9/28/07 12.0 <1 ND 3.1 J -- 2508/2522 South Boulevard (Former Dry Cleaner and Gas Station Properties) Hydraulic Lift Closure 2522-S-1 9/26/07 8-9 <1 ----ND 2522-S-2 9/26/07 8-9 <1 ----ND 2522-S-3 9/26/07 8.0 <1 ----ND 2522-S-4 9/26/07 11-12 <1 ----67 NCDENR UST Section Action Level 10 10 250 Only detected compounds are shown in table -- = Not Analyzed mg/kg = Milligrams per kilogram TPH = Total Petroleum Hydrocarbons BGS = Below ground surface J - Estimated value between Reporting Limit and F i e l d S c r e e n i n g V o l a t i l e o r g a n i c c o m p o u n d s - p p m ( P I D ) Depth (feet BGS) TOTAL PETROLEUM HYDROCARBONS METHODS 8015/91071 (mg/kg) D i e s e l R a n g e O r g a n i c s ( D R O ) G a s o l i n e R a n g e O r g a n i c s ( G R O ) O i l & G r e a s e R a n g e ( O & G ) Cherokee Southline\Tables Phase II Addendum 2006-2008.xls\Soil-UST Closure TPH