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♦I y May 2001 Quarterly Ground Water Monitoring 1645 Cherokee Lane,Stockton,CA ' Hydro-Environmental Technologies,Inc ' 2.0 GROUND WATER MONITORING AND SAMPLE METHODOLOGY ' The ground water monitoring and sample analysis was conducted in accordance with approved U S Environmental Protection Agency (USEPA) methods, California Code of Regulations (CCR) Title 23 procedures, and guidelines from the PHD/EHD This investigation was conducted under the direct supervision of a California Registered Geologist(R G } 2.1 Health and Safety Plan ' For this investigation, HETI personnel revised the site specific health and safety (H&S) plan in accordance with the requirements of the USEPA 29 CFR 1910 120 and California Cal-OSHA GISO 5192 All on-site HETI and subcontractor personnel were required to adhere to the H&S plan and were ' required to have had 29 CFR 1910 120 training and its annual update The HETI project manager had the appropriate 29 CFR 1910 120 and California GISO 5192 eight-hour supervisor's course ' 2.2 Ground Water Measurements and Sampling On May 1, 2001, HETI measured and sampled the subject site's ground water from the developed monitoring wells Ground water depths were measured to the nearest 0 01-foot using a Solinist "well sounder" or similar measuring device Monitoring wells were measured and sampled in specific order from the least contaminated ground water to the most contaminated ground water to lower the possibility ' of cross contamination This was based on analyses obtained from the previous ground water monitoring event ' Prior to ground water sample collection, each monitoring well was purged of a minimum of three well casings volumes of water Once temperature, pH, and conductivity, were stabilized within 10 percent, ground water samples were collected Monitoring wells were sampled using a disposable bailer All ' equipment was subsequently decontaminated between sample events in a detergent and tap-water wash followed by a tap-water rinse, and a final rinse with distilled water ' Depth to ground water measurements, temperature, pH, and conductivity are listed in Table 2, sampling forms are in Appendix A Ground water samples were transferred to dedicated glass containers, in three preserved 40 mL VOA vials The VOA vials were properly labeled, placed inside of a Ziplock-type ' plastic bag to lessen possible outside contamination, and placed in a cooler with bagged ice for transfer to ChromaLab, of Pleasanton, a California DHS accredited laboratory Samples were transported using proper chain-of-custody procedures 2