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'[1r GROUNDWATER X01 F 24 Pn 1 51 <br /> TECHNOLOGY, INC. <br /> 41157 1'urt Chiclgu 11 i{±Lmac.G m.ortl.0:194520(415)671-1387 <br /> FAN:4 A1511wS5 <br /> February 26, 1991 <br /> Job No. 203 175 3327 <br /> Ms. Nancy Vukelich H. <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon <br /> Bishop Ranch #6 <br /> San Ramon, CA 94583 <br /> Re: Soil-Coring and Well-Point Investigation <br /> 11th Street and Corral Hollow Road <br /> Tracy, California <br /> Dear Ms. Vukelich: <br /> This letter report presents the results and findings of the Groundwater Technology, Inc. assessment of <br /> the soil and groundwater beneath the subject site (Figure 1, Site Location Map). This project conformed <br /> to the scope of work presented to Chevron U.S.A. Inc. in January 1990, and was performed under <br /> Chevron Work Release No. 474-4980. The following work steps were performed: <br /> o Conducted a site visit to determine optimal sampling locations. <br /> o Conducted a one-day soil-coring program to collect soil samples for laboratory <br /> analyses. <br /> o Conducted a limited well-point study, concurrent with the soil sampling, to collect three <br /> groundwater samples for analyses. <br /> o Prepared this report on the results and findings of this assessment <br /> The initial site visit was conducted on January 18, 1991. Based on the information gathered, optimal <br /> sample locations were selected. On January 31, 1991, seven soil-coring holes were drilled on site in the <br /> approximate locations shown on Figure 2. Site conditions prevented the completion of additional <br /> boreholes within the allotted time. The soil cores were drilled to a depth of 10-feet below grade with <br /> three of the holes being drilled to a depth of 14-feet below grade to allow for the collection of well-point <br /> samples. A man-portable soil-sampling system that employs a hydraulic sledge hammer to drive a steel <br /> sampling barrel into the soil was used for the drilling. The sampling barrel was withdrawn and opened <br /> between each 21/�foot drive, revealing a continuous core of the subsurface materials. This core was <br /> examined in the field for evidence of contamination and logged. Selected samples from the total core <br /> were retained for laboratory analyses. A minimum of three soil samples were collected from each <br /> core location. <br /> Temporary well points were installed in PC-I, PG4 and PC-7. In each of these holes, a 3/4-inch <br /> diameter polyvinyl chloride (PVC) well point was inserted into the hole after the final sampling drive. <br /> Water samples were extracted from the well point by means of a peristaltic pump. Once samples were <br /> collected, the well points were removed. All sampling holes were backfilled to surface grade with neat <br /> cement grouL <br /> I lffi,,,lhiouVhuul lh,,('_S_Condo w,d!lreeu•us <br />