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I <br /> Fuller Mobile Home Park <br /> 365 East Louise, Lathrop, California <br /> Phase H Site Characterization - Continued <br /> 1.0 Project Identi Identification <br /> .f' <br /> This project was developed to further investigate an underground storage tank release at <br /> the Fuller Mobile Home Park property located at 365 E Louise Avenue, in Lathrop, <br /> California (Figure 1) The Phase II work further explored the vertical and lateral extent of <br /> the gasoline and diesel contamination disclosed in the first phase of work <br /> 2.0 Site Description and History <br /> On September 7, 1990, SEMCO, under permit, removed Fuller Mobile Home Park's fuel <br /> facility, which consisted of two underground storage tanks, a 550 gallon diesel tank and a <br /> 1000 gallon gasoline tank Soil samples taken from beneath the tanks disclosed <br /> concentrations of gasoline, diesel, and BTX&E <br /> On March 31 and April 1,i 992, WHF Environmental Consultants, Inc , drilled four soil <br /> borings in the vicinity of the former underground tanks and obtained groundwater samples <br /> from the borings through a stainless steel well casing Soil samples for laboratory analysis <br /> were obtained at 5 and 12 5 feet in depth All five foot samples were non-detect AN of <br /> the 12 5 foot soil and groundwater samples had varying concentrations of gasoline, diesel, <br /> and BTX&E (Table 2) <br /> On November 17 & 18, 1993, WHF drilled three soil borings and completed them as <br /> groundwater monitoring wells MW-1, 2 & 3 The wells were located on the shoulder of <br /> the proposed storm water retention pond (Figure 2), and were used to determine the <br /> groundwater gradient, and to define the soil and groundwater contamination <br /> Laboratory soil samples were taken from all three borings at five and ten feet below <br /> ground level A minimum of two soil samples from each boring were selected for analysis <br /> based on odor, discoloration, and previous findings <br />