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Results of Groundwater Pumping Tests - 152 East I Ith Street, Tracy Page 2 INTRODUCTION This report documents the results of groundwater pumping tests performed to evaluate the hydrogeological properties of soils underlying property at 152 East 11th Street, Tracy, California The site has been affected by release of gasoline from underground storage tanks that were formerly located on the property The pumping tests were performed pursuant to a request made by the San Joaquin County Public Health Services, Environmental Health Division (SJCPHS) SITE LOCATION The subject property is situated at No 152 East IIth Street, Tracy, California This location is shown on Figure I An area plan is presented as Figure 2 SITE CODE The SJCPHS has assigned this site SITE CODE 9021 BACKGROUND The property at 152 East 1 I th Street was operated as a gasoline station from approximately 1946 until 1978 Over that period, the station was operated by a number of entities that included Benny's Signal Service Station, Coffey's Signal Service Station, Bob's Enco Gas Station and Terrible Herbst Inc Terrible Herbst Inc installed one 10,000 gallon and two 3,000 gallon underground storage tanks in 1972 Mr and Mrs Carl Navarra and Mr and Mrs Albert Navarra (the Navarras) purchased the property in December 1978 from the San Diego Armour Oil Company No fuel dispensing or service station operations have been conducted on the site since that time The property is now occupied by Russel's Flower Pavilion In April 1984, the three tanks described above were removed from the site under the permit and oversight of the City of Tracy No soil or groundwater samples were taken at the time the tanks were removed GEOLOGY AND HYDROGEOLOGY The subject property and the surrounding area are situated on level terrain on the distal, northern slope of an alluvial fan The underlying alluvial sediments are of Quaternary to Recent age Logs of monitoring well borings on and in the area around the site indicate that the soils beneath the site include clays, silty clays, sandy clays, clays with gravel, sands, silty sands and sands with gravel These clastic materials are distributed in a complex lenticular