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Sierra Paci c Grouniwater Consultants Inc. <br /> I L tl;...;�T=T, <br /> ,Ft 1{ <br /> 1 - .�YDROGEOLOGISTS&GEOLOGISTS <br /> May 21, 1996 <br /> Mr. W.T. Nickerson <br /> Unocal, ERS <br /> 2000 Crow Canyon Road, Suite 400 <br /> San Ramon, California 94583 <br /> Subject. Sierra-Pacific Groundwater Consultants, Inc., First-Quarter 1996 Quarterly Monitoring <br /> Report, 2130 West Washington Street, Stockton, Unocal OrderlContract: 3400001179, Sierra- <br /> Pacific Project No. 92-033 <br /> Dear Mr. Nickerson: <br /> The First-Quarter 1996 Quarterly Monitoring Report is enclosed for your information. Copies have <br /> been sent to all concerned parties. Not much has changed at Washington Street. <br /> Near-surface ground water has flowed generally west since 1993. The potentiometric gradient on 18 <br /> March 1996 was 0.009. Water levels at up-gradient monitoring well MW-2 have exhibited the greatest <br /> seasonal variations due to localized ponding and infiltration of surface runoff. Nitrates detected in <br /> ground-water samples from monitoring wells MW-2 and MW-8 originate from an off-site source. Water <br /> samples collected from the single, down-gradient, monitoring well (MW-7) have consistently contained <br /> little or no detectable nitrate concentrations. <br /> Please let me know if you have questions or further directives. <br /> Sincerely, <br /> SIERRA-PACIFIC GROUNDWATER CONSULTANTS, INC. <br /> John e en Rapp, CE -11' 33 <br /> Senior Engineering Geologist <br /> JSR/jb <br /> Enclosure <br /> C. Jan Wagoner, Unocal <br /> Jack Holm, Cargill <br /> Charlene Wall, Port of Stockton <br /> Wendy Wyels, RWQCB <br /> Michael Infurna, San Joaquin County <br /> (916)933-1468 <br /> 491 1 Windplay Drive.Suite 4 EI Dorado Hills,California 9576? (916)933-3197 FAX <br />