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Texaco Refining 108 cutting Boulevard <br /> and Marketing Inc Richmond CA 94804 <br /> /0 <br /> February 27, 1995 <br /> ENV-STUDIES SURVEYS.&REPORTS <br /> 440 W. Charter Way <br /> Stockton, California <br /> Ms. Linda A. Turkatte <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> 445 N. San Joaquin Street <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Dear Ms. Turkatte: <br /> Texaco Environmental Services has prepared the following response to your correspondence of <br /> February 10, 1995. Each comment is addressed sequentially below. <br /> As requested, you will receive quarterly updates regarding the current status of all activities at this <br /> site. <br /> The most recently installed monitoring wells (MW-13, MW-14, MW-15, MW-16, and MW-17) were <br /> sampled only once since they were installed. As requested, these wells will be monitored quarterly <br /> for groundwater elevation and will be incorporated into a more frequent sampling plan which is <br /> outlined below. <br /> A modified sampling plan has been prepared and includes the following tasks. Depth to water will be <br /> gauged in all wells on a quarterly basis. Monitoring wells will be sampled on the following schedule: <br /> Quarter 1 and Quarter 3: MW-1, MW-4, MW-5, MW-6, MW-7. MW-9, MW-10, MW-13, MW-14, <br /> MW-15 and MW-16. <br /> Quarter 2 and Quarter 4: MW-1, MW-2, MW-3, MW-4, MW-5, MW-8, MW-11, MW-13, MW-15, <br /> MW-17. <br /> This schedule ensures that each well will be sampled at least twice per year and that downgradient <br /> wells are sampled quarterly. The modified schedule will be implemented in March 1995 unless <br /> directed otherwise by your office. <br /> During the September 1994 sampling event, QAIQC blanks were labeled as MW-21 and MW-26 to <br /> prevent the laboratory from realizing the nature of the samples. There are no wells at this location <br /> designated as MW-21 or MW-26. <br /> The date and time of relinquishment was inadvertently omitted by the sampler from the chain of <br /> custody for the September 22, 1994 samplig event. During the time between sample collection and <br /> receipt by the laboratory, the samples were maintained under refrigeration in RESNA custody. <br /> Building on a Tradition of Quality <br />