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30 June 2017 AGE Project No.07-1529 Risk Assessment Work Plan Page 2 of 6 APACHE PLASTICS(Former) 2050 East Fremont Street,Stockton,California • Report preparation. Each of these tasks are discussed below in detail. 1.0. INTRODUCTION At the request of Mr. Bill Stoermer of Fremont Plaza Investments, Advanced 2.1. PERMITTING AND PRE-FIELD WORK PREPARATIONS GeoEnvironmental, Inc. (AGE) has prepared this Risk Assessment Work Plan,for the property located at 2050 East Fremont Street, Stockton,California(site).The scope of Applicable site assessment permits will be obtained from the San Joaquin County work includes the advancement of two(2)soil borings for installation of semi-permanent Environmental Health Department(EHD). Encroachment and revocable permits will be soil-vapor wells and for collection of shallow soil and soil-vapor samples to evaluate the obtained through the City of Stockton. In addition,a site specific health and safety plan risk to human health due to dermal contact and vapor intrusion to indoor air at the site. will be prepared in accordance with Occupational Safety and Health Guidance Manual The work plan provides a description of the scope of work and procedures to be used for for Hazardous Waste Site Activities(National Institute for Occupational Safety and Health soil boring advancement, soil-vapor well installation, and soil and soil-vapor sample Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). collection and analysis. The site and surrounding area are illustrated in Figure 1. Prior to mobilization, each soil boring will be clearly marked and a utility clearance Structures, soil borings, well locations, and proposed soil and soil-vapor sampling obtained through Underground Service Alert.The EH will be contacted at least 48 hours locations are illustrated in Figure 2.Site background information can be found in the AGE- prior to conducting any field work. prepared,Corrective Action Plan(CAP)dated 10 June 2014 and Groundwater Monitoring Report—Second Quarter 2017 dated 24 August 2016. 2.2. SOIL BORING AND SAMPLING This work plan was prepared as directed by Central Valley Regional Water Quality Control Board (CVRWQCB) letter dated, 19 May 2017 (Appendix A), and in accordance with AGE proposes to advance a total of two(2)soil borings utilizing a 3-inch diameter hand guidelines issued by the California Regional Water Quality Control Board(CRWQCB)for auger to install soil-vapor wells and collect shallow soil and soil-vapor samples at the site investigation of underground storage tank(UST)sites.Additionally, the work plan has (Figure 2). A description of proposed soil boring locations, sampling and technical been prepared in accordance with California Environmental Protection Agency (EPA) justification are provided below: Department of Toxic Substances Control(DTSC), Los Angeles Regional Water Quality Control Board,San Francisco Regional Water Quality Control Board,Advisory Active Soil One(1)soil boring will be advanced to a total depth of 6.0 feet below surface grade Gas Investigations,dated July 2015. (bsg)adjacent to the former UST area/source area and well VEW-1,the area with the historically highest petroleum hydrocarbon impact to shallow soil(Table 1),to evaluate direct contact and the potential threat for petroleum hydrocarbon soil- 2.0. SCOPE OF WORK vapor intrusion to the site building;and Based on data collected during previous investigations,CVRWQCB staff has directed the One(1)soil boring will be advanced to a total depth of 6.0 feet bsg between wells preparation of a work plan to assess the risk to human health due to dermal contact and EW-1 and VEW-2,the wells with the highest dissolved benzene concentrations vapor intrusion to indoor air.Currently,site data does not meet the Low-Threat UST Case (Table 2), to evaluate direct contact and the potential threat for petroleum Closure Policy(LTCP) media specific criteria for Direct Contact and Petroleum Vapor hydrocarbon soil-vapor intrusion to the site building. Intrusion to Indoor Air. The scope of work to assess risk to human health and collect sufficient data to satisfy the LTCP criteria will involve the following tasks: 2.3. LABORATORY ANALYSIS • Permitting and pre-field work activities; Advancement of soil borings for installation of soil-vapor wells and collection of soil Soil samples will be collected at 5 feet bsg and will be analyzed by a California • Department of Public Health(CDPH)-certified laboratory for the following constituents: and soil-vapor samples; • Sample analysis;and Total petroleum hydrocarbons quantified as gasoline(TPH-g)in accordance with EPA Method 8015M; A,hm ,dGwE,v1m ental Inc. Ads cedGmEnvimnment•1 Inc.