ARCHIVED REPORTS_XR0012717 - Laserfiche WebLink

Home Browse Search

• e i S 1. SITE CONTACTS Station Number: Former Chevron SS 9-1918 Station Address: 45 East Harding Way Stockton,California Chevron's Project Manager: Lisa Backlund Chevron U.S.A.Inc. 2410 Camino Ramon P.O. Box 5004 San Ramon,California 94583-0804 415-842-9040 Consultant to Chevron: EA Engineering,Science,and Technology 41 Lafayette Circle Lafayette,California 94549 415-283-7077 EA Project Geologist: Tent'R.Winsor 2. ACTIVITIES,MARCH THROUGH SEP'T'EMBER 1990 Depths to water have been monitored quarterly since the wells were installed in 1988. When sufficient water occurred in the wells,groundwater was sampled and analyzed. In March 1990, the groundwater elevation was about 30 feet below mean sea`level ('fable 1),and only one well, MW2 (Figure 1),contained purgeable groundwater. The remaining wells were dry on 21 Sep- tember and 18 December 1989, and wells MW1, MW7,and MW8 were dry on 12 July 1989. All eight wells including MW2(Figure 1), were either dry or contained very little water on 28 June and 18 September 1990,making it unfeasible to sample during the second and third quarters of 1990. A cumulative history of analytical results of groundwater sampling is provided in Table 2. The laboratory report from 22 March 1990, when only MW2 could be sampled, is provided as Appendix A. A well sampling field form from 22 March 1990 for MW2 is included in Appendi B. 3. PLANNED ACTIVITIES All wells will continue to be gauged quarterly for depth to water and/or depth to bottom using an optical interface probe. EA will be prepared to purge and sample any wells which contain enough water to sample. Late 1990--EA has written a work plan to construct two deeper wells which would extend into a deeper aquifer to provide information on the vertical extent of contamination under the site (Figures I and 2). c66r)1 91 sn-90rytr 1