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Mimi <br /> iyT4" <br /> ` GeoStrategies Inc. <br /> Gettler-Ryan In(,'. <br /> September 5, 1991 <br /> Page 2 <br /> Soil samples were collected at five-foot depth intervals, using a modified <br /> California split-spoon sampler fitted with clean brass tube liners. Soil samples <br /> were screened at each sample interval for organic vapor, using an Organic <br /> Vapor Monitor (OVM) photoionization detector. OVM readings are presented on <br /> the exploratory boring logs in Appendix A. Selected soil samples retained for <br /> chemical analysis were covered on bath ends with teflon tape and sealed with <br /> plastic end caps. The samples were labeled, entered on a Chain-of-Custody form <br /> and stored with ice until relinquished to Western Environmental Science and <br /> Technology (WEST), a State-certified lzboratory located in Davis, California. <br /> Monitoring We COCanstructinn <br /> Borings L-1, C-2, and C-3 were drilled to total depths of 30.0, 31.0, and 30.5 <br /> feet, respectively. The locations of the borings are presented on Plate 2. The <br /> wells were constructed in the boreholes using 2-inch-diameter Schedule 40 PVC <br /> blank well casing zrid 0.020-inch factory-slotted well screen. The monitoring <br /> well construction derails are presented with the boring logs in Appendix A. The <br /> monitoring wells were developed on July 25, 1991. Purge water evacuated <br /> during developmetrt was collected in 55-gallon drums and stored on-site. Purge <br /> water will be disposed at an appropriate facility as directed by Chevron U.S.A. <br /> SITE LTTHOLOGY <br /> Lithology beneath the site consists primarily of silt, clay and silty sand which <br /> are interbedded with sand in lenses and thin strata. Groundwater was first <br /> encountered during drilling approximately 19 feet below grade and was observed <br /> to stabilize at the same depth. This appears to be indicative of unconfined <br /> aquifer conditions. Depth to groundwater was mersured on July 29, 1991 using <br /> an oil-water interface probe. Static groundwater elevation data indicate an <br /> noaatHC git1enThis s consistent 1 with with row <br /> ater flow toward the east- <br /> rrtheastbeneath the site. <br /> regional groundwater flow <br /> direction. <br /> _..._-X28602-4 _.. __....._ _..._. ---._- ------- ------ <br />