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I' <br /> PROBLEM ASSESSMENT REPORT <br /> CHAPIN BROTHERS, INC. <br /> 1766 MONTE DIABLO AVENUE <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> Science & Engineering Analysis Corporation (SEACOR®) was selected by Mr Russell Chapin of <br /> Chapin Brothers, Inc on December 6, 1993, to conduct a subsurface soil and groundwater <br /> investigation at 1766 Monte Diablo Avenue in Stockton, California (Figure 1) The purpose of this <br /> work was to provide information concerning the lateral and vertical extents of known subsurface <br /> contamination at the site, and to evaluate the feasibility of proven remedial technologies as possible <br /> solutions for the necessary site remediation work This work was conducted directly by SEACOR <br /> under the direct supervision of a State of California Registered Geologist <br /> 2.0 BACKGROUND <br /> Prior to acquisition of the site by Mr Russell Chapin in 1985, the site was leased by Mr Chapin from <br /> . Mr Tom Blanchard (deceased) from 1975 to 1985 Between the years 1941 and 1975, Mr Chapin <br /> subleased the property from Shell Oil Company Shell Oil held the master lease from Mr Blanchard <br /> during that time Mr Chapin obtained the master lease and purchased the service station equipment <br /> from Shell in 1975 <br /> During the late 1930's, Shell Oil Company leased the property, made improvements, installed the <br /> original service station equipment including two or three small underground storage tanks, and <br /> opened a gasoline station Underground storage tanks were added to the site from time to time <br /> during the years from 1941 to 1975 as retail sales increased In 1963, Shell Oil Company replaced <br /> a leaky 8,000-gallon underground gasoline storage tank No record for the removal of this tank was <br /> available The site was used to sell gasoline until December 30, 1990 All of the known underground <br /> storage tanks at the site passed tank integrity tests in January, 1990 <br /> I <br /> 3.0 SITE CONDITIONS <br /> The site is situated in the central part of the Great Valley Physiographic Province approximately 0 35 <br /> mile north of the Port of Stockton deep water channel turning basin (San Joaquin River) and <br /> approximately 14 miles south of the Calaveras River The site is flat-lying with zero relief Soil <br /> stratigraphy at the site is characterized by horizontal distributary channel and overbank deposits of <br /> mainly silty sand and sandy silt with subordinate clayey silts Soil at the site has developed on the <br /> Quaternary Modesto Formation These sediments were derived predominantly from igneous and <br /> SE <br /> ACOR 014 01-1 par 1 <br />