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• <br /> IWAW <br /> Working To Restore Nature <br />• <br /> 3164 Gold Camp Drive <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 852-6690 <br /> Fax (916) 852-6688 <br />• <br /> January 4, 1993 <br /> Mr Bob Boust <br /> • Unocal Corporation <br /> P O Box 5155 <br /> San Ramon, California 94583 <br /> Subject Ground-Water Monitoring, Fourth Quarter 1992, at Unocal Service Station <br /> • No 2859, 1665 Pacific Avenue, Stockton, California <br /> Mr Boust <br /> At Unocal's request, RESNA Industries has conducted the ground-water monitoring for the <br /> 00 fourth quarter 1992 at the subject site (Plate 1) The work was conducted pursuant to our <br /> Site Safety Plan dated January 1, 1992 The data from the monitoring event are attached <br /> Potentiometric data and groundwater samples were collected from the onsite and offsite <br /> monitoring wells on November 13, 1992 The field procedures used during the monitoring <br /> event are attached At Unocal's request, equipment rinseate and purge water were removed <br /> • from the site by RESNA Industries and transported to Gibson Oil & Refining Co , Inc in <br /> Redwood City, California <br /> Cumulative potentiometric and analytical data are summarized in Table 1 A <br /> Potentiometric Map was constructed from the ground-water elevation data(Plate 2) Copies <br /> • of the Chain of Custody Record(s) and analytical reports are attached <br /> The next monitoring event has been scheduled for the week of February 15, 14 We <br /> recommend a copy of this report be forwarded to Ms Diane Hinson of the San Joaquin <br /> Local Health District, P O Box 2009, Stockton, California 95201, and Ms Elizabeth A <br /> • Thayer of the California Regional Water Quality Control Board, Central Valley Region, <br /> 3443 Routier Road, Sacramento, California 95827-3098 <br /> (M 1201bbou <br /> 38012-14 <br /> • <br />