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Fuller Mobile Home Park <br /> 365 E. Louise Avenue <br /> Lathrop, California <br /> Site Closure Summary <br /> 1.0 Summary of Work To Date <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 (Figure 1) <br /> On March 31 and April 1,1992, WHF Environmental Consultants, Inc , drilled four soil <br /> bonngs 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 All 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 bonngs 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 /> 1 Laboratory soil samples were taken from all three bonngs 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 /> On November 22, 1994, WIC' drilled two bonngs, B-5 and B-6, to obtain data to help <br />' determine placement of additional monitoring wells Laboratory soil samples were <br /> obtained at five and ten feet below ground level and a groundwater sample was bailed <br /> from each boring through a stainless steel screen inside the augers B-5 soil samples were <br /> ND (None Detected), but the groundwater sample had BTEX contamination B-6 was <br /> ND for both soil and water Monitoring well MW-4 was installed in the sidewalk of <br />' B=be Street in the apparent down-gradient direction Laboratory soil samples were <br /> obtained at five, ten and twenty-five feet below ground level <br /> 1 <br />