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TABLE OF CONTENTS 1.0 INTRODUCTION 1.0 INTRODUCTION......_____. ............�1 Partner Engineering and Science, Inc(Partner),on behalf of Stuart Limited Partnership(SUP),is pleased to ....�..........��....................�-u submit this Workplan for Soil Vapor list (Workplan) Tracy Corners Shopping 1.1 Objective........................................................................................................_. ...................._1 �P P° Sampling *P <Y Lerner located at 3225 North Tracy Boulevard,Tracy,1.2 Limitations.........................................................................................................__........................._1 cY q,in San Joaquin County,California (hereafter referred to as'the Site'). 2.0 SITE DESCRIPTION AND HISTORY_.... _..................... .....______2 This Workplan was prepared in response to the requirements for additional Site chamoteriaation and soil 2.1 Site Description........................................................................ ..........................2 vapor sampling specified in the California Department of Toxic Substances Control(DTSC) December 31", 22 ProjectHistory................_.........................................................._............... ..............................2 2019 letter from Ms.Cindy Chain-Britton to Mr.Stuart Sobek 3.0 GEOLOGY AND HYDROGEOLOGY.......-_......._..............__......_..............__3 4.0 FIELD ACf1VMES._............_._......................__.......................................... -S 1.1 Objective 4.1 Drilling Permits._...........................................__.._....................................................._........................._.5 4.2 Health and Safety Plan............................................................................................................................5 This Workplan describes the installation and sampling of additional soil vapor monitoring points on Site 4.3 Utility Cleamnce..........................................._......................................-...................................................5 and south of the Site on Sadett Place. Procedures for replacement of existing,damaged soil vapor probes 4.4 Soil Gas Probe Installation................................................................................................................._.5 and replacement of probes with no flow conditions are also discussed in this Workplan.Additionally,the 4.4.1 Soil Gas Probe Locations.....................................................................................................5 scope of work presented herein was discussed with DTSC staff during a meeting on October 9,2019. 4A.2 Drilling Equipment................................................................................................................5 4.4.3 Decontamination....................................................................................................................6 The proposed activities described herein will be performed in accordance with the Quality 4.4.4 Sampling Depths...............-...................................................................................................6 Assurance/Quality Control Plan(QA/QC Plan;Appendix A),Sampling and Analysis Plan(SAP;Appendix 3), 4A.5 Soil Sampling Methodology........................................................_.................................._.6 and Site Health and Safety Plan (HASP;Appendix Cj previously submitted to the DTSC as part of the 4.4.6 Soil Gas Probe Construction..............................................................................................6 Sampling and Analysis Workplan - Tary Comers Shopping Center (dated August 15, 2016. These 4.5 Investigation-Derived Waste................................................................................................................7 documents were approved by the DTSC in a letter to Mr.Stuart Sobek dated August 21,2016. 5.0 SOIL GAS SAMPLING.................................................._..............._....................._8 5.1 Soil Gas Sampling Methodology.._...................................................................._._...................8 5.2 Regulatory Agency Guidance........................_. ..............9 12 Limitations 6.0 SCHEDULE,REPORTING,AND ANTICIPATED ACTIVITIES............. ........10 This Workplan fog Additional Soil Vapor Investigation was prepared by Partner under the professional 7.0 SIGNATURES OF PARTICIPATING PROFESSIONALS._............ ____....11 direction and review ofthe registered professional(s)listed in Section 7.0 ofthis document Specified work was performed in accordance with generally accepted practices in environmental engineering and science, Rgures 1. Site Plan engineering geology,and hydrogeology. No other warranty,either expressed or implied,is made. 2. Topographic Map The recommendations and/or conclusions provided in this Workplan are based on obsenations, the 3A. Sail Vapor Probe and SVE Well Locations goveming regulations,and/or available information from regulatory agencies,previous field investigations; 311. Soil Vapor Probe and SVE Well Locations-Former Dry cleaners Vicinity and/or the results of laboratory analysis of soil,soil gas,and/or groundwater samples. Recommendations 4. Proposed Soil Vapor Probe Locations-Sarlett Place and/or conclusions beyond those stated and reported herein should not be inferred from this document S. Soil Gas Probe Construction Reports,both verbal and written,as they pertain to the Tary Corners Shopping Center are for the sole use and benefit of Stuart Limited Partnership,LLC,and/or DTSC. This report has no other purpose and may not be relied upon by another person or entity without the written consent of Partner. Workplan for Additional l Sol Vap or lree tigadon Tracy Comers Center PARTNER 35Norh Tracy Boulevard Tay, 95376 Februan,7,2020 Page 1