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Home My WebLink About22008_Charlotte Aircraft_Groundwater Sampling Report_20150521 JANUARY 2014 GROUNDWATER SAMPLING REPORT CHARLOTTE AIRCRAFT CORPORATION 7705 EAST W.T. HARRIS BOULEVARD CHARLOTTE, NORTH CAROLINA IHSB #NONCD0001478, FORMER APS #19258 Prepared for: Charlotte Aircraft Corporation 7705 East W.T. Harris Boulevard Charlotte, North Carolina 28227 Prepared by: Mid-Atlantic Associates, Inc. 409 Rogers View Court Raleigh, North Carolina 27610 Mid-Atlantic Project No. R2143.03 Report Reproduced May 21, 2015REPRODUCTION REPOEPO TION ON VARD VARD OLINA OLINA ER APS #19ER APS #19 epared for: epared for: lotte Aircraftotte Aircraf 5 East W.T. ast W.T Charlotte, NoCharlotte, No JANUARY 2014 GROUNDWATER SAMPLING REPORT CHARLOTTE AIRCRAFT CORPORATION 7705 EAST W.T. HARRIS BOULEVARD CHARLOTTE, NORTH CAROLINA IHSB #NONCD0001478, FORMER APS #19258 Mid-Atlantic Project No. R2143.03 Report Reproduced May 21, 2015 Prepared for: Prepared by: Charlotte Aircraft Corporation MID-ATLANTIC ASSOCIATES, INC. 7705 East W.T. Harris Boulevard Charlotte, North Carolina 28227 Robert D. Hill, P.E. Principal Engineer Sean Gallagher Environmental Scientist REPRODUCTION03 03 1, 2015 1, 2015 on n ulevard ulevard na 28227 na 2822 TABLE OF CONTENTS 1.0 INTRODUCTION ................................................................................................. 1 2.0 SEMI-ANNUAL MONITORING PROGRAM ........................................................ 1 3.0 GROUNDWATER MONITORING AND SAMPLING SUMMARY ........................ 1 4.0 SHALLOW GROUNDWATER MONITORING WELLS ....................................... 2 5.0 DEEP GROUNDWATER MONITORING WELLS................................................ 2 TABLES Table 1 Groundwater Monitoring Summary, January 27, 2014 Table 2 Groundwater Level Summary, January 27, 2014 Table 3 Groundwater Analytical Results Summary, January 27, 2014 Table 4 Groundwater Analytical History DRAWINGS Drawing 1 Site and Monitoring Well Location Map Drawing 2 Shallow Groundwater Contour Map, January 27, 2014 Drawing 3 Deep Groundwater Contour Map, January 27, 2014 Drawing 4 TCE Isoconcentration Shallow Well Contour Map, January 27, 2014 Drawing 5 TCE Isoconcentration Deep Well Contour Map, January 27, 2014 Drawing 6 PCE Isoconcentration Shallow Well Contour Map, January 27, 2014 Drawing 7 PCE Isoconcentration Deep Well Contour Map, January 27, 2014 Drawing 8 cis-1,2 Dichloroethene Shallow Well Contour Map, January 27, 2014 Drawing 9 cis-1,2 Dichloroethene Deep Well Contour Map, January 27, 2014 Drawing 10 RW1 TCE History Graph Drawing 11 DMW2 TCE History Graph Drawing 12 DMW3 TCE and PCE History Graph Drawing 13 DMW4 TCE and PCE History Graph Drawing 14 MW12 TCE History Graph Drawing 15 MW5 TCE History Graph Drawing 16 MW9 TCE History Graph Drawing 17 MW17A TCE History Graph Drawing 18 MW9 PCE History Graph Drawing 19 MW17A PCE History Graph Drawing 20 MW5 TCE and cis,1-2 Dichloroethene History Graph Drawing 21 MW12 TCE and cis,1-2 Dichloroethene History Graph APPENDIX Chain of Custody and Groundwater Analytical Data REPRODUCTION27, 2014 27, 2 p January 27, 2January 27, 2 January 27, 2January 27 Well Contour Well Contour Well Contour Well Conto allow Well Coallow Well Co Deep Well Coep Well Co nene Shallow WShallow W heneene Deep WDeep W ory Graph ory Graph History GraphHistory Grap CE and PCE HCE and PC TCE and PCETCE and PC 12 TCE Histor2 TCE Histor W5 TCE HistoW5 TCE Histo 9 TCE Hi9 TCE H A TCA T 1.0 INTRODUCTION The Charlotte Aircraft Corporation site is situated on three adjoining tracts of property comprising a total area of approximately 28 acres. The site is located at 7705 East W. T. Harris Boulevard in Charlotte, North Carolina; approximately 0.8 miles north of Albemarle Road (Highway 24/27). The site contains numerous structures consisting of warehouses, workshops, storage buildings, storage sheds, outdoor storage racks, and offices. Charlotte Aircraft Corporation has operated at this facility since between 1952 and 1953 as an aircraft salvage operation and wholesale parts distributor. The Charlotte Aircraft site is part of an original 43 acre tract formerly known as “Delta Airbase.” Prior to 1952, Delta Airbase was used by United Aero Service as a flight training school and aircraft maintenance facility. 2.0 GROUNDWATER MONITORING PROGRAM This groundwater monitoring report documents the results of monitoring conducted as requested by NCDENR via letter to Charlotte Aircraft dated December 23, 2011. As recommended in the NCDENR correspondence, monitoring wells RW1, MW1, DMW1, DMW2, DMW3, DMW4, MW5, MW8, MW9, MW12, MW17A, MW21 and MW22, located as shown on Drawing 1, were selected for the monitoring program to assess the success of the source removal action and the ability of natural attenuation processes to reduce groundwater concentrations over time. In accordance with NCDENR’s correspondence to Charlotte Aircraft, the following information is included in this sampling report: • Water level measurements were collected from all monitoring wells associated with the Charlotte Aircraft site; and • Groundwater level contours and isoconcentration contours have been contoured separately for the deep and shallow wells. 3.0 GROUNDWATER MONITORING AND SAMPLING SUMMARY Indicated monitoring wells were sampled on January 27 and 28, 2014 by Mid-Atlantic personnel. Groundwater levels were recorded in all wells associated with the site. Field monitoring data was collected from all wells sampled at the time of sampling. Field monitoring data included depth to water, well volume, evacuated volume, temperature, REPRODUCTIONning ng the resultsthe results te Aircraft de Aircraft dence, mondence, mon MW9, MWMW9, M e selected foselected fo ion and the on and the ons over tims over tim ENR’s correENR’s corr n this samplthis samp evel measvel meas ated with thated with th waterwate January 2014 Groundwater Monitoring May 21, 2015 Charlotte Aircraft Corporation Page 2 Charlotte, North Carolina pH, specific conductance, oxidation-reduction potential, and dissolved oxygen. Field monitoring parameters are summarized in Table 1. Groundwater levels measured during this monitoring event are summarized in Table 2. Shallow and deep well groundwater surface contour maps are indicated on Drawings 2 and 3. All groundwater samples were submitted to Con-Test Analytical Laboratory in East Charlotte, North Carolina for analysis by Method SM 6200B. Analytical results are summarized in Table 3. Isoconcentration contour maps for TCE, PCE, and cis-1,2 Dichloroethene are presented on Drawings 4, 5, and 6, respectively. Historical changes in TCE and PCE concentrations are indicated in Table 4 and presented graphically for certain wells on Drawings 7 through 18. 4.0 SHALLOW GROUNDWATER MONITORING WELLS TCE and PCE concentrations were relatively stable in the shallow groundwater monitoring wells sampled relative to the last sampling event in January 2012. The TCE concentration in the most hydraulically downgradient shallow well, MW-22, exhibited a decrease in TCE concentration from 3.56 ug/L to 0.84 ug/L, which is now below its groundwater quality standard of 3.0 ug/L. Cis-1,2 Dichloroethene, a by-product of TCE biodegradation, continues to remain elevated in the sample from shallow well MW12 at 2,100 ug/L. 5.0 DEEP GROUNDWATER MONITORING WELLS TCE and PCE concentrations remained generally stable in all deep monitoring wells with the exception of a significant increase in both TCE and PCE concentrations detected in the sample collected from RW1, where the TCE concentration increased from 336 ug/L during the January 2012 sampling event to 18,000 ug/L in the January 2014 sampling event and the PCE concentration increased from None Detected during the January 2012 sampling event to 44 J ug/L in the January 2014 sampling event. Cis-1,2 Dichloroethene, a by-product of TCE biodegradation, continues to remain elevated in deep well DMW2 at 9,000 ug/L. Comparisons of cis-1,2 Dichloroethene and TCE concentrations in shallow wells MW12 and MW5 are represented graphically in Drawings 17 and 18. Other Method SM 6200B analytes detected in excess of NCDENR Water Limits are indicated by shading in Table 3. Not all Method SM 6200B analytes are listed in Table 3. REPRODUCTIONe in the she in the s g event in Jag event in Ja ent shallow nt shallow L to 0.84 ugto 0.84 u s-1,2 Dichlor-1,2 Dich ed in the saed in the sa MONITORINONITORIN ons remainens remain significant significa e collected e collected ng the Januag the Jan vent and thevent and the 2 sampling2 sampling January 2014 Groundwater Monitoring May 21, 2015 Charlotte Aircraft Corporation Page 3 Charlotte, North Carolina Trends TCE concentrations continue to trend slightly downward in MW12 (Drawing 14), and in MW9 (Drawing 16). TCE concentrations have significantly decreased in MW5 (Drawing 15). PCE concentration continues to trend downward in MW9 (Drawing 18). TCE concentration trends in deep monitoring wells RW1, DMW2, DMW3 and DMW4 are indicated in Drawings 10 through 13, respectively. 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