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1714 Main Street <br />Escalon, California 95320-1927 <br />Telephone: (209) 838-9888 <br />Facsimile: (209) 838-9883 <br />October 19, 2009 <br />Workplan for Subsurface Investigation and Soil Excavation <br />Lionudakis Firewood, Inc. — 20541 McHenry, Escalon, CA <br />1.1 History and Release Discovery <br />An illicit discharge of diesel fuel to the storm drain system of Lionudakis, Firewood, Inc. (Site) was <br />reported to San Joaquin County in 2007. The alleged discharge was reported to have entered a <br />storm drain inlet located north of the above ground storage tanks (ASTs) and entered a storm water <br />basin. The ASTs are located on the west side of a 3.22 -acre parcel (APN 24712020) and the storm <br />water basin was located on the west side of a 9.63 -acre parcel (APN 24712008). A vicinity map is <br />included as Figure 1 and a site map is included as Figure 2. <br />The storm water basin previously located on the west side of a 9.63 -acre parcel (APN 24712008) <br />was backfilled and abandoned in July 2007. The effluent piping to the abandoned storm water <br />basin was removed and the storm drain system routed to a new storm water basin constructed on <br />the northern end of a 10 -acre parcel (24712006). <br />On September 2, 2009, the San Joaquin County Environmental Health Department (EHD) <br />advanced three (3) soil borings (131, B2, and 133) within the confines of the abandoned storm water <br />basin. Ground Zero Analysis, Inc. (Ground Zero) reviewed EHD field notes. The field notes <br />indicated that the borings were advanced to 14, 20, and 16 feet below grade surface (bgs), <br />respectively. Soil and water samples were collected from the culvert (pit) located just south of <br />boring B2. The "pit" was the last catch basin in the storm drain system before storm water entered <br />the abandoned storm water basin. <br />Analytical results provided to Ground Zero indicate selected samples were analyzed for the <br />following: <br />• Total petroleum hydrocarbons as gasoline (TPHg), diesel range organics (DROs), kerosene <br />range organics (KROs), and motor oil range organics (MORO) by EPA method <br />8015/8015B <br />• CAM 17 metals by EPA method 6020/6020A <br />• Volatile organic compounds (VOCs) by EPA method 8260 <br />G:IGROUNDZEIUONUDAKISIWorkPlanlWP Site Assessment and Remediation.doc <br />