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• Mr.Harlin Knoll Page 3 of 4 • Sample 5C 1' —TPHmo was not reported above laboratory detection limits. • Sample 5C2' —TPHmo was not reported above laboratory detection limits. • Sample 5C3' — TPHg, TPHd, TPHmo, BTEX constituents, ethylene glycol, and diethylene glycol were not reported above laboratory detection limits. There is no correlation between analytical results and PID readings. The three locations with the highest PID readings were below laboratory reporting limits for all analyzed constituents. SITE INVESTIGATION CONCLUSIONS The surface of the McDowell yard is stained with automotive related fluids. Standing water on the northern portion of the McDowell yard pools onto the subject property up to near the gas meter then flows back onto the McDowell property and to the street. Contamination originating from the McDowell yard has impacted at least the upper six inches of soil on the subject property. However, the contamination has not infiltrated to a depth of 3 feet below grade. Ground Zero concludes that the soil contamination appears to be sourced from pooling and run-off from the northern portion of the McDowell yard and the contamination is isolated to the shallow surface. SCOPE OF WORK—LIMITED SOIL EXCAVATON Site Preparation and Permitting Upon approval of this workplan, the appropriate permits will be obtained from San Joaquin County Environmental Health Department (EHD) and the City of Escalon (City). Both the EHD and the City will be given advance notice of all work to be performed at the Site. The area in which drilling activities will be conducted will be cleared of underground utilities by Underground Services Alert prior to any work being performed at the Site. Soil Excavation The proposed excavation area is approximately 30-inches wide, 30 feet long and 12-inches deep and is outlined in Figure 2. The area is a small area between the McDowell yard and the residence to the north. Ground Zero anticipates less than 4 cubic yards of soil will be generated. The soil will be excavated by hand and stockpiled on plastic sheeting located on the McDowell yard. The soil will be covered with plastic until analytical results from the stockpile and excavation are received, reviewed, and a soil disposal profile submitted to Republic Landfill of Manteca, California. Upon County approval, the stockpiled soil will be transported to and disposed of at Republic Landfill by Thorpe Oil, Inc. Stockpile and Excavation Sample Collection Ground Zero will collect a 3:1 composite of the stockpile as well as two (2) floor samples from the excavation. Soil samples will be collected in brass tubes, sealed with Teflon® sheets and plastic caps, uniquely labeled, temporarily stored on ice in an ice chest cooled to approximately 4°C, and will be delivered under chain of custody protocol to Argon Laboratories of Ceres, California. G:IGROUNDZEV angum EscalonlReportMSoil Removal Workplan.doc