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x Gemini Aetro ra hic Investf aliens �. iNTRODUCTION In accordance with the wrltten request from San Joaquin County Public Health Services,Environmental Health Division, Gemini Petrographic investigations (GPI) is pleased to submit this Work Plan for a initial soil contamination Investigation at COU Trailers f=acility, Stockton, CA. The purpose of the Work Plan Is to address and documented the potential for soil and/or groundwater contamination In the vicinity of the previously removed underground storage tanks. It Is necessary to evaluate the vertical extent of soil contamination Inorder to evaluate the potential impact on groundwater, it any, and to develop recommendations based on tills investigation to further define the extent of contamination found. Y, PROPOSED SCONE OF WORK FOR DETERMINING EXTENT OF SITE SOiL CONTAMINATiON GPI proposes to drlll one(1)soil boring within within the vicinity of the underground storage tanks to a depth of between 40 and 50 feet as shown in Plate 1. Solis encountered In the boring will be sampled starting at 5 feet below the present grade and sampled every five feet and/or at changes in lithologles and/or zones of suspected contamination. The actual scope of work will be determined by the San Joaqu?n County Public Health Services,Environmental Health DIVIsion,however,It Is antlolpated the preliminary Investigation will Include the following tasks: u s Task 1-Background Data Collection,Permitting,and Preparation of Site Health and safety plan • Task 2-Sall Logging/Screening and Sampling _. o Task 3-Laboratory Analyses a Task 4-Data Analyses and Report Preparation A detailed descriptlon of each task is provided below. TASK 1 -SITE AND GEOHYDROLOGiC BACKGROUND SITE LOCATION The Cozad Trailers Facility is located at 4907 East Waterloo Road approximately 1/2 mile from Hwy 99 in Stockton,CA. The site contains numerous buildings used In the manufacturing of custom trailers for highway use. The property is adjacent to other light Industrial and commercial businesses and nearby service stations. immediately adjacent to the property Is F&H Construction which removed several underground storage tanks In 1990. Across the highway are several commercial properties containing known underground storage tanks. Among these commercial properties, Paragon Ventures, has undergone an Initial hydrologic Investigation, which resulted in detection of significant soil contamination.This property Is located downgradient from Cozad Trailers site.To the west,there are numerous service stations containing multiple underground storage tanks, if which Waterloo Shell Is known to have an unauthorized release of petroleum products. The general location of the site Is prov?ded in Plates 1 &2. y