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i <br /> i <br /> • <br /> r Fuller Mobile Home Park <br /> 365 East Louise, Lathrop, California <br /> IPhase III Site Remediation <br /> Feasibility Study & Work Plan <br /> I <br /> I <br /> 1.0 Project Identification <br />' This project was developed to further investigate an underground storage tank release at the <br /> Fuller Mobile Home Park (aka Ryan MIP and currently known as Walnut Grove N4HP) <br />' property located at 365 E Louise Avenue, in Lathrop, California (Figure 1) This work plan <br /> was developed to propose remediation methods for the gasoline and diesel contamination <br /> disclosed by previous work and proposed additional work <br /> I <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 /> IOn 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 />' bonngs 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 />' <br /> Laboratory samples les were taken from all three borings at five and ten feet below ground <br /> p <br /> level A minimum of two soil samples from each boring were selected for analysis based on <br />' odor, 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 /> I <br />