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r 1 0 INTRODUCTION <br /> This report documents the results of limited subsurface investigation conducted by Apex <br /> Envirotech, Inc (Apex), at Colberg Boat Works, 401 North Stockton Street, Stockton, California <br /> (Figure 1). The investigation included the completion of eleven probe holes and associated soil <br />' and groundwater sampling and analysis <br /> This report is based, in part, on information provided to Apex by Colberg Boat Works and is <br />' subject to modification as newly acquired information may warrant <br /> 1.1_ Purpm <br /> The purpose of the investigation was to <br />' 1 assess the existence and extent of petroleum hydrocarbons in soil and groundwater <br /> in the areas of the former underground storage tank areas, <br />' 2 determine the presence or absence of petroleum hydrocarbons, oil & grease, <br /> halogenated hydrocarbons (solvents) or elevated levels of metals to the subsurface <br /> at selected areas on the site <br /> 1-2_ Scone <br />' The scope of work completed at the site was performed according to the Apex standard operating <br /> procedures included as Appendix A, and includes <br /> • Completing eleven drill holes to a depth of approximately 15 to 30 feet below <br /> ground surface (bgs) <br />' Collect selected soil samples from each boring for charactenzauon and chemical <br /> analysis <br />' Collect groundwater samples from seven of the eleven probe holes <br /> • Submit the soil and groundwater samples, under chain-of-custody, to a California <br /> approved analytical laboratory for analysis of total petroleum hydrocarbons, as <br /> gasoline (TPHg), total petroleum hydrocarbons, as diesel (TPHd), benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX), total oil & grease, halogenated <br /> hydrocarbons (solvents) and EPA Priority Metals by appropriate EPA Methods <br /> ' Not all samples were analyzed for all constituents The decision on what <br /> constituents to analyze each sample for was based upon what types of former <br /> activities took place at the part of the site where the sample was taken <br /> Phase II Site Assessment Report <br /> {OL01 001 <br /> January 23, 1995 Page 1 <br />