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Emergency Remediatio•2480 Tracy Blvd., Tracy, CA. • Page 4 SOIL REMEDIATION FOR CONSTRUCTION A contractor holding a Class A General Engineering licence with a hazardous-waste endorsement issued by the California Contractors State License Board will be mobilized to the site to complete excavation the soil that it is necessary to remove to permit the construction of the building foundations and basement of the car wash and automobile- lubrication facilities to proceed. The area of excavation involved is approximately 40 feet by 60 feet and will have a total depth of approximately 9 feet. This operation will generate approximately 400 cubic yards (loose measure) of spoil, including material affected by fuel hydrocarbons. The excavated spoil will be temporarily stockpiled on site on plastic sheeting and covered with clean soil, or plastic sheets, pending a decision either to treat the hydrocarbon affected soil on site, at a nearby location which is the property of the same owner, or to ship it for off-site disposal at a permitted facility. No excavation of contaminated soil from any areas of the site, other than the minimum required to permit construction of the car-wash automobile-lubrication facility is anticipated at this time. GROUNDWATER REMEDIATION IF REQUIRED If the groundwater sample taken on April 3, 1996 indicates the presence of hydrocarbons in the groundwater beneath the site then this section is applicable. If the groundwater contains no detectable levels of hydrocarbon then the presently-installed dewatering system will be activated prior to excavation and the water pumped to the municipal storm- water sewer as originally envisioned in the design of the facility's permanent dewatering system If the groundwater is found to be affected by hydrocarbons, it will be pumped into transportable, open-topped, 21000 gallon tanks (Baker tanks) where it will be stored prior to treatment and disposal. If the source of groundwater contamination is determined to be the Chevron gas station previously located at the intersection of Grant Line Road and Tracy Blvd., then Chevron will be given the opportunity to haul the hydrocarbon affected water off site to their refinery in Richmond, California for treatment there or to some other permitted disposal facility of their choice. Alternately, the contaminated groundwater temporally stored on site will be treated by sparging and activated carbon polishing prior to discharge to the municipal storm sewer. Any discharge of treated groundwater from the site will be subject to authorization of the discharge by the California Regional Water Quality Control Board - Central Valley Region (RWQCB) under the provisions of Board Order No 92-150 and National Pollutant Discharge System (NPDES) Permit No CA0082929, or such other permit to discharge that the RWQCB, or other concerned regulatory agency, may determine to be applicable under the site specific conditions.