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Fuller Mobile Home Park <br /> 365 East Louise, Lathrop, California Cali o <br /> Phase III Site Remediation <br /> Feasibility Study Work Plan <br /> LO Project Identification <br /> This project was developed to further investigate an underground storage tank release at the <br /> Fuller Mobile Home Park (MHP),(aka Ryan MHP and currently known as Walnut Grove <br /> F MHP) property located at 365 E. Louise Avenue, in Lathrop, California (Figure 1). This work <br /> Lplan was developed to propose remediation methods for the gasoline and diesel contamination <br /> disclosed by previous work and to propose additional work. <br /> 2.0 Site Description and History <br /> On September 7, 1990, SEMCO, under permit, removed Fuller MHP's fuel facility, which <br /> consisted of two underground storage tanks; a 550 gallon diesel tank and a 1000 gallon <br /> gasoline tank. Soil samples taken from beneath the tanks disclosed concentrations of gasoline, <br /> diesel, and BTX&E. <br /> On March 31 and April 1,1992, WHF Environmental Consultants, Inc., drilled four soil borings <br /> in the vicinity of the former underground tanks and obtained groundwater samples from the <br /> borings through a stainless steel well casing. Soil samples for laboratory analysis were <br /> obtained at 5 and 12.5 feet in depth. All five foot samples were non-detect. All of the 12.5 <br /> foot soil and groundwater samples had varying concentrations of gasoline, diesel, and BTX&E <br /> (Tables 1 & 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 the <br /> proposed storm water retention pond (Figure 2), and were used to determine the groundwater <br /> 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 ground <br /> level. A minimum of two soil samples from each boring were selected for analysis based on <br /> Lodor, discoloration, and previous findings. <br /> On November 22, 1994, WHF drilled two borings, B-5 and B-6, to obtain data to help <br /> determine placement of additional monitoring wells. Laboratory soil samples were obtained at <br /> L <br />