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HomeMy WebLinkAbout2022_rpt_32376_ust_1_60 UST System Removal and Replacement Report 7-Eleven Store No. 32376 9600 Brimhall Road Bakersfield, CA 93312 Stantec Project No. 185851117 December 8, 2022 Prepared for: 7-Eleven, Inc. P.O. Box 711 – Loc 0418 Dallas, TX 75221 Prepared by: Stantec Consulting Services Inc. 9797 Aero Drive, Suite 310 San Diego, CA 92123 (858) 751-1200 Sign-off Sheet This document entitled UST System Removal and Replacement Report was prepared by Stantec Consulting Services Inc. (“Stantec”) for the account of 7-Eleven, Inc. (the “Client”). Any reliance on this document by any third party is strictly prohibited. The material in it reflects Stantec’s professional judgment in light of the scope, schedule and other limitations stated in the document and in the contract between Stantec and the Client. The opinions in the document are based on conditions and information existing at the time the document was published and do not take into account any subsequent changes. In preparing the document, Stantec did not verify information supplied to it by others. Any use which a third party makes of this document is the responsibility of such third party. Such third party agrees that Stantec shall not be responsible for costs or damages of any kind, if any, suffered by it or any other third party as a result of decisions made or actions taken based on this document. Prepared by (signature) Daantje Meijer, Associate Scientist Daantje.MeijerII@stantec.com / 858-633-4205 Reviewed by (signature) Jenna Martinez, Senior Scientist Jenna.Martinez@stantec.com / 858-633-4247 Approved by (signature) Patrick A. McConnell, Principal Geologist, PG # 7205 Pat.McConnell@stantec.com / 858-633-4222 exp 10/31/24 UST SYSTEM REMOVAL AND REPLACEMENT REPORT 7-Eleven Store No. 32376, 9600 Brimhall Road, Bakersfield, CA 93312 Table of Contents 1.0 INTRODUCTION .......................................................................................................... 1.1 1.1 PURPOSE AND SCOPE OF SERVICES ..................................................................... 1.1 1.2 BACKGROUND ............................................................................................................ 1.1 2.0 FACILITY DESCRIPTION ............................................................................................ 2.1 2.1 SITE LOCATION .......................................................................................................... 2.1 2.2 SITE DESCRIPTION .................................................................................................... 2.1 3.0 FIELD ACTIVITIES ...................................................................................................... 3.1 3.1 UST REMOVAL AND REPLACEMENT ACTIVITIES .................................................... 3.1 3.2 SOIL SAMPLING ACTIVITIES ..................................................................................... 3.1 3.3 ANALYTICAL METHODS ............................................................................................. 3.1 4.0 ANALYTICAL RESULTS ............................................................................................. 4.1 4.1 SOIL SAMPLE ANALYTICAL RESULTS ...................................................................... 4.1 5.0 SUMMARY ................................................................................................................... 5.1 6.0 RECOMMENDATIONS ................................................................................................ 6.1 LIST OF TABLES Table 1 ....................................................................................... Soil Sample Analytical Results LIST OF FIGURES Figure 1 .......................................................................................................... Site Location Map Figure 2 ........................................................................................................................ Site Plan LIST OF APPENDICES Appendix A ............................... Rinsate Manifest and Tank Disposal/Destruction Documentation Appendix B ............................................................................ Non-Hazardous Soil Bills of Lading Appendix C ...................... Soil Sample Laboratory Report and Chain-of-Custody Documentation UST SYSTEM REMOVAL AND REPLACEMENT REPORT 7-Eleven Store No. 32376, 9600 Brimhall Road, Bakersfield, CA 93312 Introduction December 8, 2022 v:\1858\active\185851117\05_report_deliv\deliverable\reports\2022_rpt_32376_ust.docx 1.1 1.0 INTRODUCTION This report documents underground storage tank (UST) system removal and replacement activities conducted at 7-Eleven Store No. 32376 located at 9600 Brimhall Road in Bakersfield, California (Figure 1). These services were conducted in accordance with the requirements of the Bakersfield Fire Department (BFD). Stantec Consulting Services Inc. (Stantec) conducted soil sampling and observed tank removal activities. RD Builders (RDB) was subcontracted by 7-Eleven, Inc. (7-Eleven) to conduct the UST removal and replacement activities. 1.1 PURPOSE AND SCOPE OF SERVICES Stantec observed the removal of two existing USTs, dispenser islands, and product piping. Stantec collected soil samples to assess subsurface conditions beneath the former UST area, dispenser islands, and product piping. Stantec’s scope of services consisted of the following tasks:  Preparation of a site-specific Health and Safety Plan;  Observation of the UST removal activities;  Collection of soil samples beneath the dispenser islands and product piping, and from the UST excavation at the direction of the BFD specialist;  Coordination of laboratory analysis of soil samples collected; and  Preparation of this report documenting the UST removal activities. 1.2 BACKGROUND No previous environmental work has been conducted at the site. UST SYSTEM REMOVAL AND REPLACEMENT REPORT 7-Eleven Store No. 32376, 9600 Brimhall Road, Bakersfield, CA 93312 Facility Description December 8, 2022 v:\1858\active\185851117\05_report_deliv\deliverable\reports\2022_rpt_32376_ust.docx 2.1 2.0 FACILITY DESCRIPTION 2.1 SITE LOCATION The site is located at the northeast corner of Brimhall Road and Calloway Drive in Bakersfield, Kern County, California (Figure 1). The property is bounded to the south by Brimhall Road, to the north and east by a commercial shopping center and to the west by Calloway Drive. The site is located in a mixed residential and commercial area. 2.2 SITE DESCRIPTION The site is an operating 7-Eleven convenience store and gasoline station (Figure 2). Two 10,000-gallon double- walled steel USTs were located in the central portion of the property. Six dispensers were located south of the USTs and convenience store building. The UST, dispensers, and parking area are paved with concrete the rest of the site is paved with asphalt. Two new 20,000-gallon double-walled fiberglass USTs were installed in an expanded tank excavation where the previous tanks were on the property. UST SYSTEM REMOVAL AND REPLACEMENT REPORT 7-Eleven Store No. 32376, 9600 Brimhall Road, Bakersfield, CA 93312 Field Activities December 8, 2022 v:\1858\active\185851117\05_report_deliv\deliverable\reports\2022_rpt_32376_ust.docx 3.1 3.0 FIELD ACTIVITIES 3.1 UST REMOVAL AND REPLACEMENT ACTIVITIES On November 10, 2022, Stantec observed the removal of two 10,000-gallon double-walled steel USTs at the site. The USTs were triple rinsed on site and were approved for removal by the BFD. The tanks were transported to SA Recycling in Anaheim, California for destruction and disposal. The rinsate manifest and disposal documentation for the USTs are provided in Appendix A. On November 16, 2022, RD Builders installed two new USTs: one chambered 20,000-gallon double-walled fiberglass UST, and one standard 20,000-gallon double-walled fiberglass UST. The new USTs were installed in an expanded tank excavation. The UST overburden soil was stockpiled during the UST removal activities. On November 11, 14, and 22, 2022, approximately 740 cubic yards of clean soil were transported to Kootstra Dairy in Bakersfield, California for disposal. Non-hazardous bills of lading and waste manifests are included in Appendix B. 3.2 SOIL SAMPLING ACTIVITIES On November 10, 2022, Stantec personnel collected thirty soil samples under the direction of the BFD. Soil samples were obtained at approximately two and six feet beneath the former dispenser islands and product piping. Soil samples were collected near each end of each UST at depths of two and six feet below the bottom of the tanks. The soil samples beneath the dispensers and product piping and the samples from the excavation were collected using a hand auger or the excavator bucket. The soil samples were placed in clean laboratory supplied glass jars. Each jar was completely filled to minimize headspace and sealed with a Teflon lined screw cap. Each sample was labeled and placed in a chilled cooler. 3.3 ANALYTICAL METHODS The soil samples were delivered under chain-of-custody to Pace Analytical National (Pace), a California state- certified laboratory located in Mount Juliet, Tennessee. Soil samples collected beneath the dispenser islands, product piping, and from the UST excavation were analyzed for total petroleum hydrocarbons – gasoline range organics (TPH-GRO) by Environmental Protection Agency (EPA) Test Method 8015. The samples were also analyzed for benzene, toluene, ethylbenzene and total xylenes (collectively BTEX), methyl-tert-butyl ether (MTBE), tert-amyl methyl ether (TAME), tert-butyl alcohol (TBA), di-isopropyl ether (DIPE), and ethyl-tert-butyl ether (ETBE) by EPA Test Method 8260B. UST SYSTEM REMOVAL AND REPLACEMENT REPORT 7-Eleven Store No. 32376, 9600 Brimhall Road, Bakersfield, CA 93312 Analytical Results December 8, 2022 v:\1858\active\185851117\05_report_deliv\deliverable\reports\2022_rpt_32376_ust.docx 4.1 4.0 ANALYTICAL RESULTS 4.1 SOIL SAMPLE ANALYTICAL RESULTS Benzene was detected in soil sample D1-2 at a concentration of 0.00941 milligram per kilogram (mg/kg). Benzene was not detected in the remaining 29 soil samples collected above laboratory reporting limits (LRLs). TBA was detected in soil samples P1-2, P1-6, P2-2, P2-6, P3-2 and T2-W 2 at concentrations ranging from 0.00505 mg/kg in T2-W 2 to 0.00792 mg/kg in P3-2. TBA was also detected in the method blank associated with soil samples P1-2, P1-6, P2-2, P2-6, and P3-2. TBA was not detected in the remaining 24 soil samples collected above LRLs. TPH-GRO, toluene, ethylbenzene, total xylenes, TAME, DIPE, ETBE, and MTBE were not detected in any of the 30 soil samples analyzed above their respective LRLs. Soil sample analytical results are summarized in Table 1. Complete laboratory results and chain-of-custody documentation for soil samples are included in Appendix C. UST SYSTEM REMOVAL AND REPLACEMENT REPORT 7-Eleven Store No. 32376, 9600 Brimhall Road, Bakersfield, CA 93312 Summary December 8, 2022 v:\1858\active\185851117\05_report_deliv\deliverable\reports\2022_rpt_32376_ust.docx 5.1 5.0 SUMMARY On November 10, 2022, Stantec observed the removal of two 10,000-gallon double-walled steel USTs from the site. Thirty soil samples were collected beneath the dispensers and product piping, and from the UST excavation. Benzene was detected in soil sample D1-2 at a concentration of 0.00941 mg/kg. TBA was detected in soil samples P1-2, P1-6, P2-2, P2-6, P3-2, and T2-W 2 at concentrations ranging from 0.00505 mg/kg in T2-W 2 to 0.00792 mg/kg in P3-2. TBA was detected in the method blank associated with P1-2, P1-6, P2-2, P2-6, and P3-2. TPH-GRO, toluene, ethylbenzene, total xylenes, TAME, DIPE, ETBE, and MTBE were not detected in any of the 30 soil samples analyzed above their respective LRLs. On November 16, 2022, two new 20,000-gallon double-walled fiberglass USTs were installed following the completion of soil sampling and additional excavation. Approximately 740 cubic yards of clean soil were transported to Kootstra Dairy in Bakersfield, California. UST SYSTEM REMOVAL AND REPLACEMENT REPORT 7-Eleven Store No. 32376, 9600 Brimhall Road, Bakersfield, CA 93312 Recommendations December 8, 2022 v:\1858\active\185851117\05_report_deliv\deliverable\reports\2022_rpt_32376_ust.docx 6.1 6.0 RECOMMENDATIONS Based on the soil sample analytical results, no additional assessment is recommended. TABLE Sample ID Depth in Feet* Sample Date TPH-GRO Benzene Toluene Ethyl- benzene Total Xylenes TAME TBA DIPE ETBE MTBE P1-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 0.00640 B <0.00100 <0.00100 <0.00100 P1-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 0.00762 B <0.00100 <0.00100 <0.00100 P2-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 0.00662 B <0.00100 <0.00100 <0.00100 P2-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 0.00581 B <0.00100 <0.00100 <0.00100 P3-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 0.00792 B <0.00100 <0.00100 <0.00100 P3-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 P4-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 P4-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 P5-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 P5-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 T1-E 2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 T1-E 6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 T1-W 2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 T1-W 6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 T2-E 2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 T2-E 6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 T2-W 2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 0.00505 <0.00100 <0.00100 <0.00100 T2-W 6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D1-2 2.0 11/10/22 <0.100 0.00941 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D1-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D2-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D2-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 TABLE 1 SOIL SAMPLE ANALYTICAL RESULTS 7-Eleven Store No. 32376 All concentrations in milligrams per kilogram (mg/kg). V:\1858\active\185851117\05_report_deliv\deliverable\reports\2022_rpt_32376_ust.xlsx Page 1 of 2 Sample ID Depth in Feet* Sample Date TPH-GRO Benzene Toluene Ethyl- benzene Total Xylenes TAME TBA DIPE ETBE MTBE TABLE 1 SOIL SAMPLE ANALYTICAL RESULTS 7-Eleven Store No. 32376 All concentrations in milligrams per kilogram (mg/kg). D3-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D3-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D4-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D4-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D5-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D5-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D6-2 2.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 D6-6 6.0 11/10/22 <0.100 <0.00100 <0.00500 <0.00100 <0.00300 <0.00100 <0.00500 <0.00100 <0.00100 <0.00100 Notes: Bold Print - concentration equals or exceeds laboratory reporting limit * = Depth below bottom of underground storage tank, dispenser, or product piping TPH-GRO = Total petroleum hydrocarbons - gasoline range organics TAME = T-amyl methyl ether TBA = T-butyl alcohol DIPE = Di-isopropyl ether ETBE = Ethyl-t-butyl ether MTBE = Methyl-t-butyl ether <# = Below the laboratory reporting limit (LRL) shown B = The same analyte is found in the associated blank. See laboratory report sample narrative for additional information. TPH-GRO analyzed by Environmental Protection Agency (EPA) Test Method 8015. Benzene, toluene, ethylbenzene, and total xylenes (collectively BTEX), TAME, TBA, DIPE, ETBE, and MTBE analyzed by EPA Test Method 8260B. V:\1858\active\185851117\05_report_deliv\deliverable\reports\2022_rpt_32376_ust.xlsx Page 2 of 2 FIGURES HARBOR WAYDRIVEWAY DRIVEWAY DISPENSERS(UNDERNEATHCANOPY) CANOPY STORE No.35063 EXISTING CARWASHPLANTER PLANTER PLANTER PLANTER PLANTER PLANTERDRIVEWAYTRUCK PARKING NEW USTEXCAVATIONDISPENSERS NEW USTEXCAVATIONPARKING PARKING RAILROAD TRACK E GRAND AVENUEFLYERSENERGY CFNGAS STATION SIDEWALKD5-2.0D6-2.5D7A-3.0D7B-2.5D8-3.0T6-West-8USTsT3-East-8T2-East-8T1-East-8TW-1 LegendAPPROXIMATE SITE BOUNDARY LINEAPPROXIMATE SOIL SAMPLELOCATIONUNDERGROUND STORAGE TANKUSTT-1S@17' LegendUSTD6-2.5 30 Scale D3-2.0D1-2.5P3-2.0P1-2.0D4-2.0D2-2.0 APPROXIMATE SITE BOUNDARY LINEAPPROXIMATE SOIL SAMPLE LOCATIONUNDERGROUND STORAGE TANK T5-West-8T4-West-8 LegendUSTD6-2.5TW-1APPROXIMATE SITE BOUNDARY LINEAPPROXIMATE SOIL SAMPLE LOCATIONAPPROXIMATE GROUNDWATER SAMPLELOCATIONUNDERGROUND STORAGE TANK30 ScaleHARBOR WAYDRIVEWAY DRIVEWAY DISPENSERS(UNDERNEATHCANOPY) CANOPY STORE No.35063 EXISTING CARWASHPLANTER PLANTER PLANTER PLANTER PLANTER PLANTERDRIVEWAYTRUCK PARKING NEW USTEXCAVATIONDISPENSERS NEW USTEXCAVATIONPARKING PARKING RAILROAD TRACK E GRAND AVENUEFLYERSENERGY CFNGAS STATION SIDEWALKD5-2.0D6-2.5D7A-3.0D7B-2.5D8-3.0T6-West-8USTsT3-East-8T2-East-8T1-East-8TW-1 D3-2.0D1-2.5P3-2.0P1-2.0D4-2.0D2-2.0 T5-West-8T4-West-8 Legend USTD6-2.5TW-1APPROXIMATE SITE BOUNDARY LINEAPPROXIMATE SOIL SAMPLE LOCATIONAPPROXIMATE GROUNDWATER SAMPLELOCATIONUNDERGROUND STORAGE TANK 40 Scale BRIMHALL ROAD CALLOWAY DRIVE DISPENSERS(UNDERNEATHCANOPY)40 Scale USTs DISPENSERS(UNDERNEATHCANOPY)CANOPY ANDASSOCIATEDCOLUMNS STORE No.32376 DRIVEWAY PLANTER PARKINGDRIVEWAY PLANTER PLANTERPARKING SIDEWALK APPROXIMATE SOIL SAMPLELOCATIONTW-1BRIMHALLSQUARESHOPPINGCENTERAIR/WATER P2D1D2P3D3D4D5D6P5T2-ET1-ET2-WT1-WT-2T-1 P4P1 SITE LOCATIONSITE LOCATION 0 1000 2000 1 INCH = 2000 FEET Reference: Note: Coordinate system; NAD 83 California State Planes, Zone V (Ft). ORIGINAL SHEET - ANSI AV:\1858\ACTIVE\185851117\03_DATA\GIS_CAD\CAD\DWG\1-20221121_RPT_32376_2_SITE_LOCATION_MAP_(USGS).DWG11/22/2022 1:24 AMN CALIFORNIA Created By: ROCAMPOQUADRANGLE LOCATION ADJOINING QUADRANGLES www.stantec.com 9797 Aero Drive, Suite 310San Diego, CA 92123-1898 Figure No. Client/Project Title 7-ELEVEN STORE No. 32376 9600 Brimhall RoadBakersfield, CA 93312 1 SITE LOCATION MAP November, 2022185851117 U.S.G.S., 2021 Gosford, 2022 Oildale, 2021 Rosedale, 2021 Stevens, CaliforniaQuadrangles. 7.5-Minute Topographic Map. Legend UST D6-2.5 30 Scale APPROXIMATE SITE BOUNDARY LINE APPROXIMATE SOIL SAMPLE LOCATION UNDERGROUND STORAGE TANK BRIMHALL ROADCALLOWAY DRIVEDISPENSERS(UNDERNEATHCANOPY) USTs DISPENSERS(UNDERNEATHCANOPY) CANOPY ANDASSOCIATEDCOLUMNS STORE No.32376 DRIVEWAY PLANTERPARKINGDRIVEWAY PLANTER PLANTERPARKINGSIDEWALKBRIMHALLSQUARESHOPPINGCENTERAIR/WATER P2 D1 D2 P3 D3 D4 D5 D6 P5 T2-E T1-E T2-W T1-W T-2 T-1 P4 P1 N ORIGINAL SHEET - ANSI B www.stantec.com 9797 Aero Drive, Suite 310San Diego, CA 92123-1898 0 30 60 APPROXIMATE SCALE IN FEET No warranty is made by Stantec as to the accuracy, reliability, or completeness of these data. Original data werecompiled from various sources. This information may not meet National Map Accuracy Standards. This product was developedelectronically, and may be updated without notification. Any reproduction may result in a loss of scale and or information. Figure No. Client/Project Title 7-ELEVEN STORE No. 32376 9600 Brimhall RoadBakersfield, CA 93312 2 SITE PLAN November, 2022185851117V:\1858\ACTIVE\185851117\03_DATA\GIS_CAD\CAD\DWG\2-20221121_RPT_32376_2_SITE_PLAN.DWG11/22/2022 12:26 AM|Original Created by Ross C. O'Campo APPENDIX A RINSATE MANIFEST AND TANK DISPOSAL/DESTRUCTION DOCUMENTATION APPENDIX B NON-HAZARDOUS SOIL BILLS OF LADING