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n �§T C A S S O C I A T E S I N C Groundwater Pumping Test Report w Sunwest Liquoi s 2449 West Kettlema i Lane Lodi, Californi ATC Project No. 54.25 57.0001 1.0 INTRODUCTION r ATC Associates Inc. has prepared this Groundwater P ping test Report on behalf of Sunwest Liquors to summarize findings of the groundwater extraction pilot test at the above referenced site. The purpose of the pilot test was to evaluate if gr undwater extraction is a viable remedial option for remediating petroleum impacted groundwater in the vicinity of the former underground storage tanks (USTs). This work was done at the request of San Joaquin County Environmental Health Department (SJCEHD). The findings of the pilot study are summarized in the following paragraphs. 1.1 Site Location f The site is located on the northeast corner of the intersection of West Kettleman Lane and Lower Sacramento Road on the west side of the City of Lodi, California, as shown on Figure 1. The location is a commercial and residential area. The site is currently occupied by a Starbuck's Coffee. 1.2 Background On July 10, 1998, Thorpe Oil removed three gasoline USTs from the site. Soil samples taken from the excavation of the USTs and the related dispenser piping indicated that the soil was impacted with petroleum hydrocarbons. In August 1998, Geomatrix Consultants advanced fouT soil borings to determine the vertical and horizontal extent of the petroleum hydrocarbon plume One of these soil borings, approximately .. 25 feet south of the UST excavation, was completed as groundwater monitoring well GMX-1. In June 1999, Foothill Engineering supervised the advancement of three additional soil borings, which were completed as groundwater monitoring wells MW -2, MW -3, and MW -4. From July 1999 to the date of this report, quarterly monitoring was conducted under the supervision of Foothill Engineering. w:\259571reportslpumptest.doc 1