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Laurie Cotulla <br /> July 31, 1990 <br /> Page 4 <br /> Groundwater Sampling <br /> Groundwater samples will be collected from both wells immediately following development. <br /> One groundwater sample will be collected from each of the wells in two 40 ml VOA vials. <br /> Samples will be obtained at a depth equal to the screening interval of the well using a <br /> point source bailer. Following collection, each sample will be labeled, logged on a Sample <br /> Management/Chain of Custody form and stored on ice. Prior to development and sampling <br /> of each well, all development and sampling equipment will be cleaned in a solution of <br /> liquinox organic cleaner and rinsed in deionized water, and allowed to air dry. <br /> Laboratory Analysis <br /> All samples will be delivered within 24 hours to California Water laboratory (State <br /> Certification #130) in Modesto, California. Samples collected during this round of <br /> sampling will be analyzed for chlorinated hydrocarbons (EPA Method 601) and BTXE <br /> (EPA Method 602). <br /> Along with normal laboratory quality control measures, at least 10 percent spike and 10 <br /> percent duplicate samples will be run with each analysis set for quality assurance and <br /> quality control. A sample blank obtained by passing deionized water through a cleaned <br /> bailer will also be analyzed to verify on-site decontamination procedures. <br /> Water Level Measurements <br /> Water level measurements will be taken from all three monitoring wells. A Solonist Model <br /> 101 electric water level sounder will be used to measure water depths. Groundwater <br /> elevations and gradients will be calculated based on these depth measurements. <br /> PROBLEM ASSESSMENT REPORT <br /> A Problem Assessment Report summarizing the results of this investigation will be <br /> forwarded to the San Joaquin Health Department upon completion of the study. At a <br /> minimum, the report will include site plans showing the surveyed.locations of borings, and <br /> wells, logs of all borings, summaries and details of laboratory chemical analysis, results of <br /> field screening for organic chemicals, chain of custody record for the handling of all <br /> samples and recommendations for site remediation. <br />