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Apnl 24, 1989 <br /> File No 1705-2 <br /> I. INTRODUCTION AND PURPOSE <br /> { This report describes the work conducted in response to the San Joaquin County Health <br /> Departments request for additional evaluations of the extent of contamination at the 102 <br /> So Wilson Way, Stockton, CA site Based on the "Preliminary Report for Subsurface <br /> Exploration Program - 102 So Wilson Way, Stockton, CA" prepared by Balbi & Chang <br /> Associates, Inc , dated September 1, 1988, three additional borings and monitoring wells <br /> were installed at the site Chemical tests were performed on selected soil samples from <br /> I each boring and one water sample from each well <br /> The purpose of the investigation is to identify the presence and extent, if any, of contam- <br /> ination of the site soils and groundwater by fuel related hydrocarbons The work was <br /> I authorized by Mr Don Roek <br /> i <br /> II. SUMMARY OF FIELD INVESITGATIONS, PROCEDURES AND TECHNIQUES <br /> The three additional borings g and wells were drilled on January 23, 1989 Well locations <br /> were selected based on past site activity in cooperation with the San Joaquin County <br /> Health Dept staff <br /> Soil samples were collected o4n 23, 1989 and preserved for transit to the chemical <br /> testing laboratory Water samples were collected on January 31 1989, preserved <br /> transported to the laboratory The driller was Bay Area Exploration (C-57 #522125) <br /> Field methods and techniques for soil and groundwater sampling are contained in <br /> J Appendix A. Boring logs and monitoring well construction details are shown on Plates <br /> B-1 through B-7 which are presented in Appendix B <br /> M. SUMMARY OF SOIL AND GROUNDWATER CONDITIONS <br /> Soils encountered in this additional phase of work were found to be very similar to <br /> previous investigations Primarily silty clay is present in the upper 40 to 45 feet Some <br /> sand mixed with silt and clay begins at about 35 feet and grades downward to silty fine- <br /> grained sand to a depth of bl 5 feet, the maximum depth penetrated A subsurface soil <br /> L profile depicting the approximate contacts between soil/sediment lithologies is present- <br /> ed in Plate 3 <br /> Groundwater was first encountered at a depth of about 45 feet in the test borings O <br /> nce <br /> the wells were completed and casings installed, water levels were measured on two <br /> occasions. The water levels measured are shown below <br /> 1 <br />