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lie Vacuum Extraction System Vorkplan October, 1942 <br /> Firestone Store, 408, 1. El Dorado, Stockton, CA Page 5 of 8 <br /> Fractures : The soils in the area are primarily silty sands, <br /> intermixed with sands and clays. There are no subsurface <br /> fractures. Score 10 points for this feature. <br /> Precipitation: Rainfall in Stockton area is between 10 and 25 <br />' inches per year. Score 9 points for this feature. <br /> Conduits: There are no known roan-made conduits to increase <br /> vertical migration in the area. Score 10 points for this <br /> feature. <br /> Unique Sate Features: There are no unique site features in <br /> the area. Score 10 points for this feature. <br /> Based on the results of this table (total score of 44 points) , the <br /> maximum allowable hydrocarbons to remain in soil are determined as <br /> follows: <br /> Diesel = 1, 000 mg/kg <br /> I Gasoline = 100 mg/kg <br /> BTEX _ . 3/. 3/1/1 mg/kg, respectively <br /> Based on past soil sample results, diesel hydrocarbons and benzene <br /> at the tank 5 site are below cleanup levels. The VES system will <br /> need to remove the remaining gasoline (TPH) and toluene, <br /> ethylbenzene, and xylene from the soils to the cleanup levels <br /> established above. <br /> VES System Layout a <br /> The VES system is comprised of, a health and safety plan, wells, <br /> pipe routing and connections, and a vapor extraction and air <br /> treatment system. The proposed VES layout is depicted an Figure 1, <br /> and detailed in Figure 2. Except for the wells within the sidewalk <br /> area adjacent to N. El Dorado Street, all equipment and piping wall <br /> I be installed and secured inside the existing building. The area <br /> where the vapor extraction unit will be located as behind a metal <br /> linked fence that will be chained and locked. <br /> Health and Safety Plan. A health and safety plan wall be prepared <br /> and made sate specific prior to drilling or installation of vapor <br /> extraction components. <br /> wells. It is proposed to install 6 wells an the tank 5 area. <br /> Initially, it as proposed to terminate each well at 25 feet below <br /> grade. This well depth and screen length will increase the <br /> Ryan-Murphy Incorporated <br /> 'The Good Earth Company" <br />