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\j 1 <br /> i <br /> � y* <br /> -- ff A <br /> Working To Restore Nature <br /> 1710 Ma i n Street <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 CO", <br /> October 26, 1994 <br /> 150103 01 <br /> w <br /> Mr. Brad Wiest OL 1 2 ` 194 <br /> Chevron U S A Production Company ENVIRONMEIZAL HALTH <br /> P O. Box 158 PERMIT/SERVICES <br /> Rio Vista, CA 94571 <br /> Subject. Groundwater Monitoring and Sampling at Chevron USA Production Company, <br /> 540 North Aurora Street, Stockton, California <br /> Mr. Wiest* <br /> • This letter report has been prepared by RESNA Industries Inc (RESNA) at the request of <br /> Chevron USA, Inc. (Chevron) and discusses recent groundwater sampling and monitoring <br /> activities conducted at the subject site (Plate 1) <br /> GROUNDWATER MONITORING AND SAMPLING <br /> On August 29, 1994, a RESNA technician monitored fluid levels in each monitoring well. <br /> Groundwater levels have risen an average of 2 64 feet since last measured in August 1993. <br /> Groundwater elevation data is summarized in Table 1 A groundwater gradient map was <br /> created using the August 29, 1994 data (Plate 2) Groundwater flows to the north with a <br /> gradient of approximately 0.025 feet/foot or 132 feet/mile. <br /> A RESNA technician collected groundwater samples from monitoring wells MW I, MW2, and <br /> MW3 on August 29, 1994, according to the field procedures outlined in Attachment 1 Field <br /> purge logs are contained in Attachment 2 Collected groundwater samples were sent to State- <br /> Certified Sequoia Analytical Laboratones in Redwood City, California. All samples were <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons <br /> as diesel (TPHd), benzene, toluene, ethylbenzene, and xylenes (BTEX) utilizing EPA Methods <br /> 8015 modified and 8020. <br /> 150103kQuAuTLY\Qa-M4 as <br />