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San Joaquin Motor Pool Facility May 11, 1999 Site Assessment Report • a One (1) soil sample was collected from the soil stockpile generated during the exposure of the waste oil UST The soil sample reported a TRPH concentration of 65 mg/kg The stockpile was subsequently used as backfill material for the waste oil UST excavation, and a The rinsate (190 gallons), decontamination, development, and purge water (235 gallons), and soil cuttings (5 61 tons) were transported from the SITE for disposal at approved disposal facilities 14.0 QUALITY ASSURANCE/QUALITY CONTROL To increase the confidence levels in the data obtained and minimize the likelihood that judgments were made from potentially erroneous data, a quality assurance/quality control (QA/QC) program was implemented QA refers to management of actions designed to maintain precision, accuracy, completeness, and representativeness of the data developed from the project QC refers to accepted formal procedures and activities specifically designed for the purpose of collecting data that are intended to be reliable and consistent for the SITE conditions The program includes formal procedures for drilling, sampling, well installation, decontamination(Appendix A), instrument calibration, documentation of activities, calculations, and peer review Routine QC procedures were performed by the laboratory and included daily calibration of instruments, percent surrogate recoveries and analysis of matrix spikes and matrix spike duplicates (Appendix F) The laboratory reported the results to be within acceptable percent recoveries with no results exceeding the laboratory-established control limits 15.0 LIMITATIONS ' No investigation is considered thorough enough to exclude the presence of hazardous materials at a given site Therefore, if no hazardous materials have been identified during the conduct of the assessment, such a finding should not be construed as a guarantee of the absence of such materials on the property, but rather an interpretation of the results of services performed within the scope, limitations, and cost of the work performed ' Any opinions and/or recommendations presented apply to SITE conditions existing at the time of the performance of services TEM is unable to report on or accurately predict events which may impact the SITE following conduct of the described services, whether occurring naturally or caused by external forces TEM assumes no responsibility for conditions we were not authorized to investigate, or conditions not generally recognized as environmentally unacceptable at the ' time services were performed Services hereunder were performed in accordance with our agreement and understanding with, ' and solely for the use of, San Joaquin County Department of Public Works Opinions and/or recommendations are intended for the client, purpose, site, location, time frame and project parameters indicated TEM is not responsible for the subsequent separation, detachment or ' partial use of this document Any reliance on this report by a third party shall be at such party's sole risk ' 10 7 �