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s <br /> Sierra-Pacific Groundwater Consultants, Inc. Y <br /> Geologists, Engineers, and Compliance Specialists <br /> April 23, 1997 <br /> Ms. Wendy Wyels, Agricultural Regulatory Unit <br /> Central Valley - Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Subject. First Semi-Annual (1997) Monitoring Report, 2130 West Washington Street, Stockton, <br /> Unocal Order/Contract: 3400001179, Sierra-Pacific Project No. 92-033.04 <br /> Dear Ms. Wyels: <br /> Sierra-Pacific Groundwater Consultants, Inc. (Sierra-Pacific) is pleased to submit the First Semi-Annual <br /> (1997) Monitoring Report for the subject site. Ground water is still flowing west beneath the Washington <br /> Street site. The greatest potentiometric elevation changes were again observed at MW-2 where storm water <br /> infiltration apparently causes localized water mounding. The down-gradient well (MW-7) is still clean, with <br /> no nitrates detected. Nitrate levels appear to be attenuating at the up-gradient wells (MW-2 and MW-8). <br /> In response to yet another round of favorable test results, Sierra-Pacific is recommending regulatory closure <br /> of the site. It would make sense for RWQCB to release Unocal, and require Koppel to take over monitoring <br /> duties at the 2130 West Washington Street site. r-I ' r <br /> In response to your verbal request, Sierra-Pacific will measure water levels at the site on either April24_ot <br /> 25. Please call if you have any questions or directives. <br /> �1 - <br /> Sincerely, <br /> SIERRA-PACIFIC GROUNDWATER CONSULTANTS, INC. x= <br /> Jo a en pp, CEG-1133 <br /> S r Engineering Geologist <br /> JSR/DWJ/jb <br /> Enclosure <br /> C. W.T. Nickerson, Unocal <br /> Jan Wagoner, Unocal <br /> Charlene Wall, Port of Stockton <br /> Michael Infurna, San Joaquin County Environmental Health Department <br /> (916)933-1468 <br /> 4911 Windplay Drive,Suite 4 EI Dorado Hills.California 95762 .(916)933-3197 FAX <br /> i <br />