Environmental Excavation Oversight

Transcription

1 Environmental Excavation Oversight Approximately 10-Acres of Undeveloped Land East 120 th Avenue and Grant Street Northglenn, Adams County, Colorado February 26, 2013 Terracon Project No. A for: Northglenn Urban Renewal Authority Northglenn, Colorado by: Terracon Consultants, Inc. Wheat Ridge, Colorado

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3 TABLE OF CONTENTS Page No. 1.0 PROJECT BACKGROUND Standard of Care Additional Scope ations Reliance scope of work Environmental Excavation ATH Field Screening s Soil Sample Collection and Analyses SAMPLE ANALYTICAL RESULTS CONCLUSIONS AND RECOMMENDATIONS... 5 APPENDICES Appendix A: Appendix B: Figure 1 Topographic/Site Location Map Figure 2 Site Diagram Laboratory Reports

4 ENVIRONMENTAL EXCAVATION OVERSIGHT APPROXIMATELY 10-ACRES OF UNDEVELOPED LAND EAST 120 TH AVENUE AND GRANT STREET NORTHGLENN, ADAMS COUNTY, COLORADO A February 26, PROJECT BACKGROUND The site consists of an approximate 10-acre tract of undeveloped grassed land located at the southwestern corner of East 120th Avenue and Grant Street in Northglenn, Adams County Colorado. Community Center Drive transects the middle portion of the site in a north to south direction. No other improvements, occupants, or site operations were present. A topographic site location map is included as Figure 1 and a site diagram is included as Figure 2 of Appendix A. Terracon Consultants, Inc. (Terracon) performed a Phase I Environmental Site Assessment (ESA) of the property (project number ) on November 14, Based on review of the historical information, the site was developed with a farmhouse and associated buildings from at least the mid-1950s. A gasoline station (former Sinclair Station) appeared on the northwestern portion of the site from at least 1968 until 2007, when the facility was removed. The north-central and northeastern portions of the site were commercially developed from the mid-1980s through the early-1990s. The following RECs were identified in connection with the property: Petroleum-impacted soil and groundwater associated with the former onsite Sinclair Station in locations, such as the former service bays, the former dispenser island, and the former fuel oil UST Historical REC: the former gasoline USTs associated with the former onsite Sinclair Station Terracon performed a ed Site Investigation (LSI) at the former Sinclair Station, and presented the results in the report dated November 17, 2006 (project number ). The LSI identified and investigated several areas of potential environmental concerns including three former underground storage tanks (USTs) for the containment of gasoline, a former 550-gallon waste oil UST, a former 550-gallon heating oil UST, a former fuel dispenser island, and former hydraulic lifts in the service bay. Terracon provided oversight for the removal of the three remaining gasoline USTs at the former Sinclair Station on July 3, During tank removal, per Colorado Department of Labor and Employment (CDLE) -Division of Oil and Public Safety (OPS) guidance, one groundwater grab Responsive Resourceful Reliable 1

5 Environmental Excavation Oversight 120 th Avenue and Grant Street Northglenn, Colorado February 26, 2013 Terracon Project Number A sample was collected in the UST excavation for laboratory analysis prior to backfilling the excavation with clean fill material. Laboratory analysis of the groundwater sample detected benzene at 250 micrograms/liter (µg/l), exceeding the Colorado Risk Base Screening Levels (RBSLs) for benzene of 5 µg/l. As a result a Corrective Action Plan (CAP) was approved by the OPS on October 2, 2007 to install one groundwater monitoring well in the former UST excavation pit and perform quarterly sampling. A second groundwater sampling event was performed on February 6, Benzene, toluene, ethylbenzene, and xylenes (BTEX) compounds were not detected above their respective analytical method detection limit in the groundwater sample. As a result, the OPS issued a No Further Action (NFA) determination letter on April 30, 2008 in reference to the three gasoline USTs which were removed from the site on July 3, The results of Terracon s ESA (November 21, 2012) identified the former gasoline USTs as a Historic REC (HREC) to the site. Based on the analytical results obtained during Terracon s 2006 LSI, the former service bays, the former dispenser islands, and the former fuel oil UST, constitute a REC to the site. This excavation oversight was completed to assess those areas identified as a REC in Terracon s ESA. 1.1 Standard of Care Terracon s services were performed in a manner consistent with generally accepted practices of the profession undertaken in similar studies in the same geographical area during the same time period. Terracon makes no warranties, either express or implied, regarding the findings, conclusions or recommendations. Please note that Terracon does not warrant the work of laboratories, regulatory agencies or other third parties supplying information used in the preparation of the report. These environmental services were performed in accordance with the scope of work requested by you, our client, as reflected in our proposal and were not restricted by ASTM E Additional Scope ations Findings, conclusions, and recommendations resulting from these services are based upon information derived from the on-site activities and other services performed under this scope of work; such information is subject to change over time. Certain indicators of the presence of hazardous substances, petroleum products, or other constituents may have been latent, inaccessible, unobservable, non-detectable or not present during these services, and we cannot represent that the site contains no hazardous substances, toxic materials, petroleum products, or other latent conditions beyond those identified during this assessment work. Subsurface conditions may vary from those encountered at specific borings or during other surveys, tests, assessments, investigations or exploratory services; the data, interpretations, findings, and our Responsive Resourceful Reliable 2

6 Environmental Excavation Oversight 120 th Avenue and Grant Street Northglenn, Colorado February 26, 2013 Terracon Project Number A recommendations are based solely upon data obtained at the time for the purposes of addressing environmental concerns outlined in the scope of these services. 1.3 Reliance This report was prepared for the exclusive use and reliance of the Northglenn Urban Renewal Authority and. Use or reliance by any other party is prohibited without the prior written authorization of Client and Terracon. Reliance on this report by the client and all authorized parties will be subject to the terms, conditions and limitations stated in the proposal, this report, and Terracon s Terms and Conditions. The limitation of liability defined in the Terms and Conditions is the aggregate limit of Terracon s liability to the client and all relying parties. 2.0 SCOPE OF WORK The scope of services provided was comprised of four tasks: 1. Scheduling excavation work with Client s contractor 2. Soil excavation and sampling 3. Sample analyses and evaluation 4. Report preparation 2.1 Environmental Excavation The scope of services associated with this assessment included observing and evaluating soil excavated from areas previously identified as RECs. Soils in these areas were field screened with a PID to measure for volatile organic compounds (VOCs). Representative soil samples were collected from the site for laboratory analysis. During the excavation, Terracon s site geologist evaluated the soils for type, color, grain size, and other soil characteristics. Soil samples were collected and observed to document soil lithology, color, moisture content, and field screening for VOCs. In general, the entire area formerly occupied by the dispenser islands, the former fuel oil UST basin and the area where the hydraulic lifts were located was excavated to an approximate depth of 6.5 feet below ground surface (bgs). Soils encountered consisted of silty to fine grained sand from the surface to an approximate depth of six feet bgs followed by a layer of lean, dark colored, organic clay. Weathered claystone bedrock was present at an approximate depth of 6.5 feet bgs. Groundwater occurs at the contact with the weathered bedrock. Approximately 8 to 10 cubic yards of hydrocarbon impacted soil was removed from the area of the former north dispenser island. Soil sample 6 is a composite of this material. Following removal of the hydrocarbon impacted soil from the excavation pit, soil samples 3 and 4 were Responsive Resourceful Reliable 3

7 Environmental Excavation Oversight 120 th Avenue and Grant Street Northglenn, Colorado February 26, 2013 Terracon Project Number A collected for confirmation that all of the impacted soil was removed. A zone of black, organic clay was present at an approximate depth of six feet bgs. Field screening of this material with the PID did not detect the presence of petroleum hydrocarbons. Soil sample 3 was collected from this material for laboratory analysis. 2.2 ATH Field Screening s Terracon s site geologist field screened the soil samples by the Ambient Temperature Headspace (ATH) method to qualitatively detect volatile organic vapors using a PID field instrument. The ATH soil screening method involved placing a representative soil sample into Ziploc bags, resealing the bags, and allowing the bag contents to equilibrate to the surrounding ambient conditions. A Mini-Rae PID, an instrument capable of measuring volatile vapor concentrations in parts per million (ppm), was used to detect for the presence of volatile organic vapors in the soil. Soil exhibiting VOC concentrations of 25 ppm or greater were segregated and encapsulated in plastic sheeting on-site. 2.3 Soil Sample Collection and Analyses Six soil samples were collected from the excavation for laboratory analysis. The samples were, containerized in laboratory-prepared jars, and labeled identifying the sample name, collection date, and the requested laboratory analyses. The samples were placed in an ice-filled cooler for delivery to under standard chain-of custody procedures for VOC analysis by EPA 8260B and total petroleum hydrocarbons (TPH) as gasoline and diesel range organics by EPA SAMPLE ANALYTICAL RESULTS Laboratory analysis of soil removed from the excavation detected the presence of petroleum hydrocarbons (SS-6). This sample was a composite of the hydrocarbon impacted material excavated from the site. This was the only soil sample collected from this investigation that exhibited petroleum hydrocarbons. Confirmation soil samples collected from the excavation did not detect the presence of VOCs that were above the analytical method reporting limit. The analytical reports are presented in Appendix B. Responsive Resourceful Reliable 4

8 Environmental Excavation Oversight 120 th Avenue and Grant Street Northglenn, Colorado February 26, 2013 Terracon Project Number A 4.0 CONCLUSIONS AND RECOMMENDATIONS Excavation of the areas previously identified as a REC was performed to determine if hydrocarbon impacted soil above the CDLE-OPS, RBSL were present at the site. During the excavation, soils exhibiting VOCs above 25 ppm as measured in the field with the PID were segregated and stored on plastic. Approximately 8 to 10 cubic yards of hydrocarbon impacted soil was removed from an area associated with the former northern product dispenser island. These soils were stockpile on-site and encapsulated in plastic sheeting. Confirmation soil samples (SS-3 and SS-4) were collected from this area after removal of the petroleum impacted soil. Laboratory analysis of these two samples did not detect the presence of petroleum hydrocarbons that were above the analytical method detection limits. Soil sample SS-1 was collected from the northern end of the excavation in the former dispenser island area. Soil sample SS-2 was collected from the area were the former hydraulic lifts inside the station building were located. Soil sample SS-5 was collected from the area of the former waste oil tank. None of these samples exhibited hydrocarbon concentrations above the analytical method detection limits. Responsive Resourceful Reliable 5

9 APPENDIX A FIGURE 1 TOPOGRAPHIC/SITE LOCATION MAP FIGURE 2 SITE DIAGRAM

10 SITE Figure 1 TOPOGRAPHIC MAP Published: 1965 Revised: 1994 SCALE: 1 ~ 2,000' Source: USGS 7.5-Minute Series Topographic Map: Eastlake, Colorado Quadrangle NORTH Northglenn Urban Renewal Soil Excavation Oversight 20 East 120th Avenue Northglenn, Colorado Project No.

11 - EAST 120TH AVENUE - Edge of Concrete Former Landscape Area SS-3 SS-1 Former Canopy Former Dispenser Islands Former Landscape Area - COMMUNITY CENTER DRIVE - SS-4 Undeveloped Land 4,000 Gallon 8,000 Gallon 10,000 Gallon Former Station Building SS-2 Former Hydraulic Lifts Former Service Bays Former Underground Storage Tank Basin SS-5 N Former Fuel Oil Underground Storage Tank Location Undeveloped Land Former Fuel Oil Underground Storage Tank Location Legend: : Approximate s of Excavation 1. Not to scale - all locations are approximate. Soil Sample Location Consulting Engineers & Scientists W I-70 FRONTAGE RD N, SUITE 3 WHEAT RIDGE, CO PH. (303) FAX. (303) SITE DIAGRAM HAWKINS DEVELOPMENT 20 EAST 120TH AVE NORTHGLENN, CO Figure No: 2

12 APPENDIX B LABORATORY REPORT

13 741 Corporate Circle Suite I Golden, Colorado laboratory fax February 19, 2013 Steve Hoffman Wheat Ridge, CO RE: Enclosed are the results of analyses for samples received by on 02/13/13 12:12. If you have any questions concerning this report, please feel free to contact me. Sincerely, Joseph J Egry IV Laboratory Director This report shall not be reproduced, except in its entirety, without the written approval of. Test results relate only to samples analyzed. is the sole authority for authorizing edits or modifications to this document. Unauthorized modification of this report is strictly prohibited.

14 ANALYTICAL REPORT FOR SAMPLES Sample ID Laboratory ID Matrix Date Sampled Date Received SS1-6.5' R Soil 02/13/13 07:40 02/13/13 12:12 SS2-4.0' R Soil 02/13/13 08:30 02/13/13 12:12 SS3-5.0' R Soil 02/13/13 09:20 02/13/13 12:12 SS4-5.0' R Soil 02/13/13 09:45 02/13/13 12:12 SS5-6.0' R Soil 02/13/13 10:00 02/13/13 12:12 SS6 - Stockpile R Soil 02/13/13 10:15 02/13/13 12:12 Page 1 of 32

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16 SS1-6.5' R (Soil) Extractable Petroleum Hydrocarbons by 8015 C10-C28 (DRO) ND 50 Date Sampled: 02/13/13 07:40 mg/kg /15/13 02/16/13 Date Sampled: 02/13/13 07: Full Carbon Chain Surrogate: o-terphenyl 103 % Volatile Organic Compounds by EPA 8260B Date Sampled: 02/13/13 07:40 Benzene ND 2.0 ug/kg /14/13 02/15/13 EPA 8260B Bromobenzene ND 5.0 Bromochloromethane ND 5.0 Bromodichloromethane ND 5.0 Bromoform ND 5.0 Bromomethane ND 10 n-butylbenzene ND 5.0 sec-butylbenzene ND 5.0 tert-butylbenzene ND 5.0 Carbon tetrachloride ND 5.0 Chlorobenzene ND 5.0 Chloroethane ND 5.0 Chloroform ND 5.0 Chloromethane ND 15 2-Chlorotoluene ND Chlorotoluene ND 5.0 Chlorodibromomethane ND 10 1,2-Dibromo-3-chloropropane ND 15 1,2-Dibromoethane (EDB) ND 5.0 Dibromomethane ND 5.0 Page 3 of 32

17 SS1-6.5' R (Soil) Volatile Organic Compounds by EPA 8260B 1,2-Dichlorobenzene ND 5.0 ug/kg /14/13 02/15/13 1,3-Dichlorobenzene ND 5.0 1,4-Dichlorobenzene ND 5.0 Dichlorodifluoromethane ND 5.0 Tert-amyl methyl ether ND 5.0 1,1-Dichloroethane ND 5.0 1,2-Dichloroethane (EDC) ND 5.0 Tert-butyl alcohol ND 20 1,1-Dichloroethene ND 5.0 cis-1,2-dichloroethene ND 5.0 Ethyl tert-butyl ether ND 10 Di-isopropyl ether ND 5.0 trans-1,2-dichloroethene ND 5.0 Methyl tert-butyl ether ND 15 1,2-Dichloropropane ND 5.0 1,3-Dichloropropane ND 5.0 2,2-Dichloropropane ND 10 1,1-Dichloropropene ND 5.0 cis-1,3-dichloropropene ND 5.0 trans-1,3-dichloropropene ND 5.0 Ethylbenzene ND 5.0 Hexachlorobutadiene ND 5.0 Isopropylbenzene ND 5.0 p-isopropyltoluene ND 10 Methylene Chloride ND 15 Naphthalene ND 10 n-propylbenzene ND 5.0 Styrene ND 10 1,1,2,2-Tetrachloroethane ND 5.0 1,1,1,2-Tetrachloroethane ND 5.0 Tetrachloroethene ND 5.0 Toluene ND 5.0 1,2,3-Trichlorobenzene ND 5.0 1,2,4-Trichlorobenzene ND 5.0 1,1,2-Trichloroethane ND 5.0 1,1,1-Trichloroethane ND 5.0 Trichloroethene ND 5.0 EPA 8260B Page 4 of 32

18 SS1-6.5' R (Soil) Volatile Organic Compounds by EPA 8260B Trichlorofluoromethane ND 5.0 ug/kg /14/13 02/15/13 1,2,3-Trichloropropane ND 10 1,3,5-Trimethylbenzene ND 5.0 1,2,4-Trimethylbenzene ND 5.0 Vinyl chloride ND 5.0 m,p-xylene ND 10 o-xylene ND 5.0 Gasoline Range Hydrocarbons ND 500 Date Sampled: 02/13/13 07:40 EPA 8260B Surrogate: 1,2-Dichloroethane-d4 Surrogate: Toluene-d8 Surrogate: 4-Bromofluorobenzene 118 % 101 % 98.9 % Page 5 of 32

19 SS2-4.0' R (Soil) Extractable Petroleum Hydrocarbons by 8015 C10-C28 (DRO) ND 50 Date Sampled: 02/13/13 08:30 mg/kg /15/13 02/16/13 Date Sampled: 02/13/13 08: Full Carbon Chain Surrogate: o-terphenyl 105 % Volatile Organic Compounds by EPA 8260B Date Sampled: 02/13/13 08:30 Benzene ND 2.0 ug/kg /14/13 02/15/13 EPA 8260B Bromobenzene ND 5.0 Bromochloromethane ND 5.0 Bromodichloromethane ND 5.0 Bromoform ND 5.0 Bromomethane ND 10 n-butylbenzene ND 5.0 sec-butylbenzene ND 5.0 tert-butylbenzene ND 5.0 Carbon tetrachloride ND 5.0 Chlorobenzene ND 5.0 Chloroethane ND 5.0 Chloroform ND 5.0 Chloromethane ND 15 2-Chlorotoluene ND Chlorotoluene ND 5.0 Chlorodibromomethane ND 10 1,2-Dibromo-3-chloropropane ND 15 1,2-Dibromoethane (EDB) ND 5.0 Dibromomethane ND 5.0 1,2-Dichlorobenzene ND 5.0 Page 6 of 32

20 SS2-4.0' R (Soil) Volatile Organic Compounds by EPA 8260B 1,3-Dichlorobenzene ND 5.0 ug/kg /14/13 02/15/13 1,4-Dichlorobenzene ND 5.0 Dichlorodifluoromethane ND 5.0 Tert-amyl methyl ether ND 5.0 1,1-Dichloroethane ND 5.0 1,2-Dichloroethane (EDC) ND 5.0 Tert-butyl alcohol ND 20 1,1-Dichloroethene ND 5.0 cis-1,2-dichloroethene ND 5.0 Ethyl tert-butyl ether ND 10 Di-isopropyl ether ND 5.0 trans-1,2-dichloroethene ND 5.0 Methyl tert-butyl ether ND 15 1,2-Dichloropropane ND 5.0 1,3-Dichloropropane ND 5.0 2,2-Dichloropropane ND 10 1,1-Dichloropropene ND 5.0 cis-1,3-dichloropropene ND 5.0 trans-1,3-dichloropropene ND 5.0 Ethylbenzene ND 5.0 Hexachlorobutadiene ND 5.0 Isopropylbenzene ND 5.0 p-isopropyltoluene ND 10 Methylene Chloride ND 15 Naphthalene ND 10 n-propylbenzene ND 5.0 Styrene ND 10 1,1,2,2-Tetrachloroethane ND 5.0 1,1,1,2-Tetrachloroethane ND 5.0 Tetrachloroethene ND 5.0 Toluene ND 5.0 1,2,3-Trichlorobenzene ND 5.0 1,2,4-Trichlorobenzene ND 5.0 1,1,2-Trichloroethane ND 5.0 1,1,1-Trichloroethane ND 5.0 Trichloroethene ND 5.0 Trichlorofluoromethane ND 5.0 EPA 8260B Page 7 of 32

21 SS2-4.0' R (Soil) Volatile Organic Compounds by EPA 8260B 1,2,3-Trichloropropane ND 10 ug/kg /14/13 02/15/13 1,3,5-Trimethylbenzene ND 5.0 1,2,4-Trimethylbenzene ND 5.0 Vinyl chloride ND 5.0 m,p-xylene ND 10 o-xylene ND 5.0 Gasoline Range Hydrocarbons ND 500 Date Sampled: 02/13/13 08:30 EPA 8260B Surrogate: 1,2-Dichloroethane-d4 Surrogate: Toluene-d8 Surrogate: 4-Bromofluorobenzene 116 % 102 % 93.8 % Page 8 of 32

22 SS3-5.0' R (Soil) Extractable Petroleum Hydrocarbons by 8015 C10-C28 (DRO) ND 50 Date Sampled: 02/13/13 09:20 mg/kg /15/13 02/16/13 Date Sampled: 02/13/13 09: Full Carbon Chain Surrogate: o-terphenyl 110 % Volatile Organic Compounds by EPA 8260B Date Sampled: 02/13/13 09:20 Benzene ND 2.0 ug/kg /14/13 02/15/13 EPA 8260B Bromobenzene ND 5.0 Bromochloromethane ND 5.0 Bromodichloromethane ND 5.0 Bromoform ND 5.0 Bromomethane ND 10 n-butylbenzene ND 5.0 sec-butylbenzene ND 5.0 tert-butylbenzene ND 5.0 Carbon tetrachloride ND 5.0 Chlorobenzene ND 5.0 Chloroethane ND 5.0 Chloroform ND 5.0 Chloromethane ND 15 2-Chlorotoluene ND Chlorotoluene ND 5.0 Chlorodibromomethane ND 10 1,2-Dibromo-3-chloropropane ND 15 1,2-Dibromoethane (EDB) ND 5.0 Dibromomethane ND 5.0 1,2-Dichlorobenzene ND 5.0 Page 9 of 32

23 SS3-5.0' R (Soil) Volatile Organic Compounds by EPA 8260B 1,3-Dichlorobenzene ND 5.0 ug/kg /14/13 02/15/13 1,4-Dichlorobenzene ND 5.0 Dichlorodifluoromethane ND 5.0 Tert-amyl methyl ether ND 5.0 1,1-Dichloroethane ND 5.0 1,2-Dichloroethane (EDC) ND 5.0 Tert-butyl alcohol ND 20 1,1-Dichloroethene ND 5.0 Ethyl tert-butyl ether ND 10 cis-1,2-dichloroethene ND 5.0 Di-isopropyl ether ND 5.0 trans-1,2-dichloroethene ND 5.0 Methyl tert-butyl ether ND 15 1,2-Dichloropropane ND 5.0 1,3-Dichloropropane ND 5.0 2,2-Dichloropropane ND 10 1,1-Dichloropropene ND 5.0 cis-1,3-dichloropropene ND 5.0 trans-1,3-dichloropropene ND 5.0 Ethylbenzene ND 5.0 Hexachlorobutadiene ND 5.0 Isopropylbenzene ND 5.0 p-isopropyltoluene ND 10 Methylene Chloride ND 15 Naphthalene ND 10 n-propylbenzene ND 5.0 Styrene ND 10 1,1,2,2-Tetrachloroethane ND 5.0 1,1,1,2-Tetrachloroethane ND 5.0 Tetrachloroethene ND 5.0 Toluene ND 5.0 1,2,3-Trichlorobenzene ND 5.0 1,2,4-Trichlorobenzene ND 5.0 1,1,2-Trichloroethane ND 5.0 1,1,1-Trichloroethane ND 5.0 Trichloroethene ND 5.0 Trichlorofluoromethane ND 5.0 EPA 8260B Page 10 of 32

24 SS3-5.0' R (Soil) Volatile Organic Compounds by EPA 8260B 1,2,3-Trichloropropane ND 10 ug/kg /14/13 02/15/13 1,3,5-Trimethylbenzene ND 5.0 1,2,4-Trimethylbenzene ND 5.0 Vinyl chloride ND 5.0 m,p-xylene ND 10 o-xylene ND 5.0 Gasoline Range Hydrocarbons ND 500 Date Sampled: 02/13/13 09:20 EPA 8260B Surrogate: 1,2-Dichloroethane-d4 Surrogate: Toluene-d8 Surrogate: 4-Bromofluorobenzene 113 % 101 % 98.0 % Page 11 of 32

25 SS4-5.0' R (Soil) Extractable Petroleum Hydrocarbons by 8015 C10-C28 (DRO) ND 50 Date Sampled: 02/13/13 09:45 mg/kg /15/13 02/16/13 Date Sampled: 02/13/13 09: Full Carbon Chain Surrogate: o-terphenyl 108 % Volatile Organic Compounds by EPA 8260B Date Sampled: 02/13/13 09:45 Benzene ND 2.0 ug/kg /14/13 02/15/13 EPA 8260B Bromobenzene ND 5.0 Bromochloromethane ND 5.0 Bromodichloromethane ND 5.0 Bromoform ND 5.0 Bromomethane ND 10 n-butylbenzene ND 5.0 sec-butylbenzene ND 5.0 tert-butylbenzene ND 5.0 Carbon tetrachloride ND 5.0 Chlorobenzene ND 5.0 Chloroethane ND 5.0 Chloroform ND 5.0 Chloromethane ND 15 2-Chlorotoluene ND Chlorotoluene ND 5.0 Chlorodibromomethane ND 10 1,2-Dibromo-3-chloropropane ND 15 1,2-Dibromoethane (EDB) ND 5.0 Dibromomethane ND 5.0 1,2-Dichlorobenzene ND 5.0 Page 12 of 32

26 SS4-5.0' R (Soil) Volatile Organic Compounds by EPA 8260B 1,3-Dichlorobenzene ND 5.0 ug/kg /14/13 02/15/13 1,4-Dichlorobenzene ND 5.0 Dichlorodifluoromethane ND 5.0 Tert-amyl methyl ether ND 5.0 1,1-Dichloroethane ND 5.0 1,2-Dichloroethane (EDC) ND 5.0 Tert-butyl alcohol ND 20 1,1-Dichloroethene ND 5.0 cis-1,2-dichloroethene ND 5.0 Ethyl tert-butyl ether ND 10 Di-isopropyl ether ND 5.0 trans-1,2-dichloroethene ND 5.0 Methyl tert-butyl ether ND 15 1,2-Dichloropropane ND 5.0 1,3-Dichloropropane ND 5.0 2,2-Dichloropropane ND 10 1,1-Dichloropropene ND 5.0 cis-1,3-dichloropropene ND 5.0 trans-1,3-dichloropropene ND 5.0 Ethylbenzene ND 5.0 Hexachlorobutadiene ND 5.0 Isopropylbenzene ND 5.0 p-isopropyltoluene ND 10 Methylene Chloride ND 15 Naphthalene ND 10 n-propylbenzene ND 5.0 Styrene ND 10 1,1,2,2-Tetrachloroethane ND 5.0 1,1,1,2-Tetrachloroethane ND 5.0 Tetrachloroethene ND 5.0 Toluene ND 5.0 1,2,3-Trichlorobenzene ND 5.0 1,2,4-Trichlorobenzene ND 5.0 1,1,2-Trichloroethane ND 5.0 1,1,1-Trichloroethane ND 5.0 Trichloroethene ND 5.0 Trichlorofluoromethane ND 5.0 EPA 8260B Page 13 of 32

27 SS4-5.0' R (Soil) Volatile Organic Compounds by EPA 8260B 1,2,3-Trichloropropane ND 10 ug/kg /14/13 02/15/13 1,3,5-Trimethylbenzene ND 5.0 1,2,4-Trimethylbenzene ND 5.0 Vinyl chloride ND 5.0 m,p-xylene ND 10 o-xylene ND 5.0 Gasoline Range Hydrocarbons ND 500 Date Sampled: 02/13/13 09:45 EPA 8260B Surrogate: 1,2-Dichloroethane-d4 Surrogate: Toluene-d8 Surrogate: 4-Bromofluorobenzene 117 % 99.0 % 96.3 % Page 14 of 32

28 SS5-6.0' R (Soil) Extractable Petroleum Hydrocarbons by 8015 C10-C28 (DRO) ND 50 Date Sampled: 02/13/13 10:00 mg/kg /15/13 02/16/13 Date Sampled: 02/13/13 10: Full Carbon Chain Surrogate: o-terphenyl 101 % Volatile Organic Compounds by EPA 8260B Date Sampled: 02/13/13 10:00 Benzene ND 2.0 ug/kg /14/13 02/15/13 EPA 8260B Bromobenzene ND 5.0 Bromochloromethane ND 5.0 Bromodichloromethane ND 5.0 Bromoform ND 5.0 Bromomethane ND 10 n-butylbenzene ND 5.0 sec-butylbenzene ND 5.0 tert-butylbenzene ND 5.0 Carbon tetrachloride ND 5.0 Chlorobenzene ND 5.0 Chloroethane ND 5.0 Chloroform ND 5.0 Chloromethane ND 15 2-Chlorotoluene ND Chlorotoluene ND 5.0 Chlorodibromomethane ND 10 1,2-Dibromo-3-chloropropane ND 15 1,2-Dibromoethane (EDB) ND 5.0 Dibromomethane ND 5.0 1,2-Dichlorobenzene ND 5.0 Page 15 of 32

29 SS5-6.0' R (Soil) Volatile Organic Compounds by EPA 8260B 1,3-Dichlorobenzene ND 5.0 ug/kg /14/13 02/15/13 1,4-Dichlorobenzene ND 5.0 Dichlorodifluoromethane ND 5.0 Tert-amyl methyl ether ND 5.0 1,1-Dichloroethane ND 5.0 1,2-Dichloroethane (EDC) ND 5.0 Tert-butyl alcohol ND 20 1,1-Dichloroethene ND 5.0 Ethyl tert-butyl ether ND 10 cis-1,2-dichloroethene ND 5.0 Di-isopropyl ether ND 5.0 trans-1,2-dichloroethene ND 5.0 Methyl tert-butyl ether ND 15 1,2-Dichloropropane ND 5.0 1,3-Dichloropropane ND 5.0 2,2-Dichloropropane ND 10 1,1-Dichloropropene ND 5.0 cis-1,3-dichloropropene ND 5.0 trans-1,3-dichloropropene ND 5.0 Ethylbenzene ND 5.0 Hexachlorobutadiene ND 5.0 Isopropylbenzene ND 5.0 p-isopropyltoluene ND 10 Methylene Chloride ND 15 Naphthalene ND 10 n-propylbenzene ND 5.0 Styrene ND 10 1,1,2,2-Tetrachloroethane ND 5.0 1,1,1,2-Tetrachloroethane ND 5.0 Tetrachloroethene ND 5.0 Toluene ND 5.0 1,2,3-Trichlorobenzene ND 5.0 1,2,4-Trichlorobenzene ND 5.0 1,1,2-Trichloroethane ND 5.0 1,1,1-Trichloroethane ND 5.0 Trichloroethene ND 5.0 Trichlorofluoromethane ND 5.0 EPA 8260B Page 16 of 32

30 SS5-6.0' R (Soil) Volatile Organic Compounds by EPA 8260B 1,2,3-Trichloropropane ND 10 ug/kg /14/13 02/15/13 1,3,5-Trimethylbenzene ND 5.0 1,2,4-Trimethylbenzene ND 5.0 Vinyl chloride ND 5.0 m,p-xylene ND 10 o-xylene ND 5.0 Gasoline Range Hydrocarbons ND 500 Date Sampled: 02/13/13 10:00 EPA 8260B Surrogate: 1,2-Dichloroethane-d4 Surrogate: Toluene-d8 Surrogate: 4-Bromofluorobenzene 112 % 97.8 % 96.5 % Page 17 of 32

31 SS6 - Stockpile R (Soil) Extractable Petroleum Hydrocarbons by 8015 C10-C28 (DRO) ND 50 Date Sampled: 02/13/13 10:15 mg/kg /15/13 02/16/13 Date Sampled: 02/13/13 10: Full Carbon Chain Surrogate: o-terphenyl 108 % Volatile Organic Compounds by EPA 8260B Date Sampled: 02/13/13 10:15 Benzene ND 2.0 ug/kg /14/13 02/15/13 EPA 8260B Bromobenzene ND 5.0 Bromochloromethane ND 5.0 Bromodichloromethane ND 5.0 Bromoform ND 5.0 Bromomethane ND 10 n-butylbenzene ND 5.0 sec-butylbenzene tert-butylbenzene Carbon tetrachloride ND 5.0 Chlorobenzene ND 5.0 Chloroethane ND 5.0 Chloroform ND 5.0 Chloromethane ND 15 2-Chlorotoluene ND Chlorotoluene ND 5.0 Chlorodibromomethane ND 10 1,2-Dibromo-3-chloropropane ND 15 1,2-Dibromoethane (EDB) ND 5.0 Dibromomethane ND 5.0 1,2-Dichlorobenzene ND 5.0 Page 18 of 32

32 SS6 - Stockpile R (Soil) Volatile Organic Compounds by EPA 8260B 1,3-Dichlorobenzene ND 5.0 ug/kg /14/13 02/15/13 1,4-Dichlorobenzene ND 5.0 Dichlorodifluoromethane ND 5.0 Tert-amyl methyl ether ND 5.0 1,1-Dichloroethane ND 5.0 1,2-Dichloroethane (EDC) ND 5.0 Tert-butyl alcohol ND 20 1,1-Dichloroethene ND 5.0 Ethyl tert-butyl ether ND 10 cis-1,2-dichloroethene ND 5.0 Di-isopropyl ether ND 5.0 trans-1,2-dichloroethene ND 5.0 Methyl tert-butyl ether ND 15 1,2-Dichloropropane ND 5.0 1,3-Dichloropropane ND 5.0 2,2-Dichloropropane ND 10 1,1-Dichloropropene ND 5.0 cis-1,3-dichloropropene ND 5.0 trans-1,3-dichloropropene ND 5.0 Ethylbenzene Hexachlorobutadiene ND 5.0 Isopropylbenzene p-isopropyltoluene ND 10 Methylene Chloride ND 15 Naphthalene ND 10 n-propylbenzene ND 5.0 Styrene ND 10 1,1,2,2-Tetrachloroethane ND 5.0 1,1,1,2-Tetrachloroethane ND 5.0 Tetrachloroethene ND 5.0 Toluene ND 5.0 1,2,3-Trichlorobenzene ND 5.0 1,2,4-Trichlorobenzene ND 5.0 1,1,2-Trichloroethane ND 5.0 1,1,1-Trichloroethane ND 5.0 Trichloroethene ND 5.0 Trichlorofluoromethane ND 5.0 EPA 8260B Page 19 of 32

33 SS6 - Stockpile R (Soil) Volatile Organic Compounds by EPA 8260B 1,2,3-Trichloropropane ND 10 ug/kg /14/13 02/15/13 1,3,5-Trimethylbenzene ND 5.0 1,2,4-Trimethylbenzene Vinyl chloride ND 5.0 m,p-xylene ND 10 o-xylene ND 5.0 Gasoline Range Hydrocarbons Date Sampled: 02/13/13 10:15 EPA 8260B Surrogate: 1,2-Dichloroethane-d4 Surrogate: Toluene-d8 Surrogate: 4-Bromofluorobenzene 112 % 105 % 110 % Page 20 of 32

34 Extractable Petroleum Hydrocarbons by Quality Control Spike Source %REC Level %REC s EPA 3550A Blank ( BLK1) : 02/15/13 : 02/16/13 C10-C28 (DRO) ND 50 mg/kg Blank ( BLK2) : 02/15/13 : 02/16/13 C10-C28 (DRO) ND 50 mg/kg LCS ( BS1) : 02/15/13 : 02/16/13 C10-C28 (DRO) mg/kg LCS ( BS2) : 02/15/13 : 02/16/13 C10-C28 (DRO) mg/kg LCS Dup ( BSD1) : 02/15/13 : 02/16/13 C10-C28 (DRO) mg/kg LCS Dup ( BSD2) : 02/15/13 : 02/16/13 C10-C28 (DRO) mg/kg Matrix Spike ( MS1) Source: R : 02/15/13 : 02/16/13 C10-C28 (DRO) mg/kg 501 ND Matrix Spike ( MS2) Source: R : 02/15/13 : 02/16/13 C10-C28 (DRO) mg/kg 501 ND Matrix Spike Dup ( MSD1) Source: R : 02/15/13 : 02/16/13 C10-C28 (DRO) mg/kg 501 ND Matrix Spike Dup ( MSD2) Source: R : 02/15/13 : 02/16/13 C10-C28 (DRO) mg/kg 501 ND Page 21 of 32

35 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS Blank ( BLK1) : 02/14/13 : 02/15/13 Benzene ND 2.0 ug/kg Bromobenzene ND 5.0 Bromochloromethane ND 5.0 Bromodichloromethane ND 5.0 Bromoform ND 5.0 Bromomethane ND 10 n-butylbenzene ND 5.0 sec-butylbenzene ND 5.0 tert-butylbenzene ND 5.0 Carbon tetrachloride ND 5.0 Chlorobenzene ND 5.0 Chloroethane ND 5.0 Chloroform ND 5.0 Chloromethane ND 15 2-Chlorotoluene ND Chlorotoluene ND 5.0 Chlorodibromomethane ND 10 1,2-Dibromo-3-chloropropane ND 15 1,2-Dibromoethane (EDB) ND 5.0 Dibromomethane ND 5.0 1,2-Dichlorobenzene ND 5.0 1,3-Dichlorobenzene ND 5.0 1,4-Dichlorobenzene ND 5.0 Dichlorodifluoromethane ND 5.0 Tert-amyl methyl ether ND 5.0 1,1-Dichloroethane ND 5.0 1,2-Dichloroethane (EDC) ND 5.0 Tert-butyl alcohol ND 20 1,1-Dichloroethene ND 5.0 cis-1,2-dichloroethene ND 5.0 Ethyl tert-butyl ether ND 10 Di-isopropyl ether ND 5.0 trans-1,2-dichloroethene ND 5.0 Methyl tert-butyl ether ND 15 1,2-Dichloropropane ND 5.0 1,3-Dichloropropane ND 5.0 2,2-Dichloropropane ND 10 1,1-Dichloropropene ND 5.0 Page 22 of 32

36 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS Blank ( BLK1) : 02/14/13 : 02/15/13 cis-1,3-dichloropropene ND 5.0 ug/kg trans-1,3-dichloropropene ND 5.0 Ethylbenzene ND 5.0 Hexachlorobutadiene ND 5.0 Isopropylbenzene ND 5.0 p-isopropyltoluene ND 10 Methylene Chloride ND 15 Naphthalene ND 10 n-propylbenzene ND 5.0 Styrene ND 10 1,1,2,2-Tetrachloroethane ND 5.0 1,1,1,2-Tetrachloroethane ND 5.0 Tetrachloroethene ND 5.0 Toluene ND 5.0 1,2,3-Trichlorobenzene ND 5.0 1,2,4-Trichlorobenzene ND 5.0 1,1,2-Trichloroethane ND 5.0 1,1,1-Trichloroethane ND 5.0 Trichloroethene ND 5.0 Trichlorofluoromethane ND 5.0 1,2,3-Trichloropropane ND 10 1,3,5-Trimethylbenzene ND 5.0 1,2,4-Trimethylbenzene ND 5.0 Vinyl chloride ND 5.0 m,p-xylene ND 10 o-xylene ND 5.0 Gasoline Range Hydrocarbons ND 500 Surrogate: 1,2-Dichloroethane-d Surrogate: Toluene-d Surrogate: 4-Bromofluorobenzene Page 23 of 32

37 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS LCS ( BS1) : 02/14/13 : 02/15/13 Benzene ug/kg Bromobenzene Bromochloromethane Bromodichloromethane Bromoform Bromomethane n-butylbenzene sec-butylbenzene tert-butylbenzene Carbon tetrachloride Chlorobenzene Chloroethane Chloroform Chloromethane Chlorotoluene Chlorotoluene Chlorodibromomethane ,2-Dibromo-3-chloropropane ,2-Dibromoethane (EDB) Dibromomethane ,2-Dichlorobenzene ,3-Dichlorobenzene ,4-Dichlorobenzene Dichlorodifluoromethane Tert-amyl methyl ether ,1-Dichloroethane ,2-Dichloroethane (EDC) Tert-butyl alcohol ,1-Dichloroethene cis-1,2-dichloroethene Ethyl tert-butyl ether Di-isopropyl ether trans-1,2-dichloroethene Methyl tert-butyl ether ,2-Dichloropropane ,3-Dichloropropane ,2-Dichloropropane ,1-Dichloropropene Page 24 of 32

38 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS LCS ( BS1) : 02/14/13 : 02/15/13 cis-1,3-dichloropropene ug/kg trans-1,3-dichloropropene Ethylbenzene Hexachlorobutadiene Isopropylbenzene p-isopropyltoluene Methylene Chloride Naphthalene n-propylbenzene Styrene ,1,2,2-Tetrachloroethane ,1,1,2-Tetrachloroethane Tetrachloroethene Toluene ,2,3-Trichlorobenzene ,2,4-Trichlorobenzene ,1,2-Trichloroethane ,1,1-Trichloroethane Trichloroethene Trichlorofluoromethane ,2,3-Trichloropropane ,3,5-Trimethylbenzene ,2,4-Trimethylbenzene Vinyl chloride m,p-xylene o-xylene Surrogate: 1,2-Dichloroethane-d Surrogate: Toluene-d Surrogate: 4-Bromofluorobenzene Page 25 of 32

39 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS LCS Dup ( BSD1) : 02/14/13 : 02/15/13 Benzene ug/kg Bromobenzene Bromochloromethane Bromodichloromethane Bromoform Bromomethane n-butylbenzene sec-butylbenzene tert-butylbenzene Carbon tetrachloride Chlorobenzene Chloroethane Chloroform Chloromethane Chlorotoluene Chlorotoluene Chlorodibromomethane ,2-Dibromo-3-chloropropane ,2-Dibromoethane (EDB) Dibromomethane ,2-Dichlorobenzene ,3-Dichlorobenzene ,4-Dichlorobenzene Dichlorodifluoromethane ,1-Dichloroethane Tert-amyl methyl ether ,2-Dichloroethane (EDC) ,1-Dichloroethene Tert-butyl alcohol cis-1,2-dichloroethene Ethyl tert-butyl ether trans-1,2-dichloroethene Di-isopropyl ether ,2-Dichloropropane Methyl tert-butyl ether ,3-Dichloropropane ,2-Dichloropropane ,1-Dichloropropene Page 26 of 32

40 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS LCS Dup ( BSD1) : 02/14/13 : 02/15/13 cis-1,3-dichloropropene ug/kg trans-1,3-dichloropropene Ethylbenzene Hexachlorobutadiene Isopropylbenzene p-isopropyltoluene Methylene Chloride Naphthalene n-propylbenzene Styrene ,1,2,2-Tetrachloroethane ,1,1,2-Tetrachloroethane Tetrachloroethene Toluene ,2,3-Trichlorobenzene ,2,4-Trichlorobenzene ,1,2-Trichloroethane ,1,1-Trichloroethane Trichloroethene Trichlorofluoromethane ,2,3-Trichloropropane ,3,5-Trimethylbenzene ,2,4-Trimethylbenzene Vinyl chloride m,p-xylene o-xylene Surrogate: 1,2-Dichloroethane-d Surrogate: Toluene-d Surrogate: 4-Bromofluorobenzene Page 27 of 32

41 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS Matrix Spike ( MS1) Source: R : 02/14/13 : 02/15/13 Benzene ug/kg 150 ND Bromobenzene ND Bromochloromethane ND Bromodichloromethane ND Bromoform ND Bromomethane ND n-butylbenzene ND sec-butylbenzene ND tert-butylbenzene ND Carbon tetrachloride ND Chlorobenzene ND Chloroethane ND Chloroform ND Chloromethane ND Chlorotoluene ND Chlorotoluene ND Chlorodibromomethane ND ,2-Dibromo-3-chloropropane ND ,2-Dibromoethane (EDB) ND Dibromomethane ND ,2-Dichlorobenzene ND ,3-Dichlorobenzene ND ,4-Dichlorobenzene ND Dichlorodifluoromethane ND Tert-amyl methyl ether ND ,1-Dichloroethane ND ,2-Dichloroethane (EDC) ND Tert-butyl alcohol ND ,1-Dichloroethene ND Ethyl tert-butyl ether ND cis-1,2-dichloroethene ND Di-isopropyl ether ND trans-1,2-dichloroethene ND Methyl tert-butyl ether ND ,2-Dichloropropane ND ,3-Dichloropropane ND ,2-Dichloropropane ND ,1-Dichloropropene ND Page 28 of 32

42 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS Matrix Spike ( MS1) Source: R : 02/14/13 : 02/15/13 cis-1,3-dichloropropene ug/kg 150 ND trans-1,3-dichloropropene ND Ethylbenzene ND Hexachlorobutadiene ND Isopropylbenzene ND p-isopropyltoluene ND Methylene Chloride ND Naphthalene ND n-propylbenzene ND Styrene ND ,1,2,2-Tetrachloroethane ND ,1,1,2-Tetrachloroethane ND Tetrachloroethene ND Toluene ND ,2,3-Trichlorobenzene ND ,2,4-Trichlorobenzene ND ,1,2-Trichloroethane ND ,1,1-Trichloroethane ND Trichloroethene ND Trichlorofluoromethane ND ,2,3-Trichloropropane ND ,3,5-Trimethylbenzene ND ,2,4-Trimethylbenzene ND Vinyl chloride ND m,p-xylene ND o-xylene ND Surrogate: 1,2-Dichloroethane-d Surrogate: Toluene-d Surrogate: 4-Bromofluorobenzene Page 29 of 32

43 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS Matrix Spike Dup ( MSD1) Source: R : 02/14/13 : 02/15/13 Benzene ug/kg 150 ND Bromobenzene ND Bromochloromethane ND Bromodichloromethane ND Bromoform ND Bromomethane ND n-butylbenzene ND sec-butylbenzene ND tert-butylbenzene ND Carbon tetrachloride ND Chlorobenzene ND Chloroethane ND Chloroform ND Chloromethane ND Chlorotoluene ND Chlorotoluene ND Chlorodibromomethane ND ,2-Dibromo-3-chloropropane ND ,2-Dibromoethane (EDB) ND Dibromomethane ND ,2-Dichlorobenzene ND ,3-Dichlorobenzene ND ,4-Dichlorobenzene ND Dichlorodifluoromethane ND Tert-amyl methyl ether ND ,1-Dichloroethane ND ,2-Dichloroethane (EDC) ND Tert-butyl alcohol ND ,1-Dichloroethene ND Ethyl tert-butyl ether ND cis-1,2-dichloroethene ND Di-isopropyl ether ND trans-1,2-dichloroethene ND Methyl tert-butyl ether ND ,2-Dichloropropane ND ,3-Dichloropropane ND ,2-Dichloropropane ND ,1-Dichloropropene ND Page 30 of 32

44 Volatile Organic Compounds by EPA 8260B - Quality Control Spike Source %REC Level %REC s EPA 5030 Soil MS Matrix Spike Dup ( MSD1) Source: R : 02/14/13 : 02/15/13 cis-1,3-dichloropropene ug/kg 150 ND trans-1,3-dichloropropene ND Ethylbenzene ND Hexachlorobutadiene ND Isopropylbenzene ND p-isopropyltoluene ND Methylene Chloride ND Naphthalene ND n-propylbenzene ND Styrene ND ,1,2,2-Tetrachloroethane ND ,1,1,2-Tetrachloroethane ND Tetrachloroethene ND Toluene ND ,2,3-Trichlorobenzene ND ,2,4-Trichlorobenzene ND ,1,2-Trichloroethane ND ,1,1-Trichloroethane ND Trichloroethene ND Trichlorofluoromethane ND ,2,3-Trichloropropane ND ,3,5-Trimethylbenzene ND ,2,4-Trimethylbenzene ND Vinyl chloride ND m,p-xylene ND o-xylene ND Surrogate: 1,2-Dichloroethane-d Surrogate: Toluene-d Surrogate: 4-Bromofluorobenzene Page 31 of 32

45 and Definitions DET ND NR dry DETECTED NOT DETECTED at or above the reporting limit Not Reported Sample results reported on a dry weight basis Relative Percent Difference Page 32 of 32