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r� �j FIELD WORK . A permit was requested and received from San Joaquin County Environmental Health Division (SJCEHD) prior to drilling the boring. The permit is included in Appendix A. A site specific Health and Safety Plan was completed. US Alert was contacted prior to drilling. SJCEHD was notified 48 hours prior to drilling. The location of the boring identified as B-1 is shown in Figure 2 . The former UST location is also clearly identified in Figure 2 . On the morning of June 29, 1994 , John N. Alt met with the drilling crew and Harlin Knoll from the SJCEHD at the parcel located at 375 W. Hazelton Ave. , Stockton CA. GREAT SIERRA EXPLORATION was the driller for the boring. The Boring Log was prepared by the Certified Engineering Geologist, who directed the drilling and recorded the observations of the geologic materials encountered on site during the drilling. Soil Samples were collected at five foot intervals. These samples were collected for a description of the subsurface soil conditions. Six soil samples were collected for chemical analysis, commencing at approximately 11 feet. The Boring Log is contained in Appendix A. The first 11 feet had fine to medium grained brown sand fill. At approximately 12 feet, dry brown clayey silt with caliche veins was encountered and a strong hydrocarbon odor observed. The next several feet changed to fine to very fine sand being moist at approximately 17 feet. The material changed to brown moist sand, fine to medium grained and moist, well sorted and grading back into a brown clayey silt at approximately 19 feet. Then changing to brownish grey clayey to moist silty sand, with what appeared to be black magnesium oxide in horizontal lenses. The strong hydrocarbon odor persisted to approximately groundwater where it became a mild hydrocarbon odor. Groundwater level was encountered at a depth of approximately 31 feet. The units changed from brownish grey clay to clayey sand, grey sand sorted medium to course and saturated. At approximately 35 feet a stiff bluish grey clay was encountered and the boring was terminated. Soil samples were collected in the lowest brass liner and were preserved by covering both ends with Teflon tape, capping with plastic caps and sealing the caps with plastic tape. These six soil samples were labeled, logged under Chain--of- Custody (COC) control, stored in a cooler with ice and transported to a state certified laboratory (SPARGER TECHNOLOGY INC. ) for analysis with COC documentation. 3