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I Di Salvo Trucking - O.S.B. <br /> Over-Excavation <br /> June 1 <br /> i <br /> Page <br /> -2- <br /> ge -2- <br /> laboratory analyses was reported n Underground Storage Tank <br /> Removal - Soil Sampling Results, Condor Earth Technologies, Inc. , <br /> October 14, 1993 . <br /> 3.0 FIELD WORK <br /> OES began over-excavation of the east sidewall near the <br /> former location of TK4 on May 6, 1994 . Marc Crum of Condor was <br /> on site to make field observations and collect soil samples <br /> following the over-excavation. Michael Collins of the San <br /> Joaquin County Environmental Health Division (SJCEHD) was on site <br /> to observe the over-excavation and select the required laboratory <br /> analyses. <br /> 3.1 Over-excavation <br /> The tank excavation is bordered on the east side be a 4 foot <br /> wide surface drain. Precipitation during the morning of May 6, <br /> 1994, filled the drain. To prevent drainage into the area of <br /> over-excavation, the rainwater was diverted into the north end of <br /> the excavation. <br /> The soil at the site is light brown, silty, fine- to medium <br /> grained sand from the ground surface to a depth of approximately <br /> 13 feet. From approximately 13 feet to 15 .5 feet, fine- to <br /> course sand is present. The east sidewall of the tank excavation <br /> was extended to the east approximately 4 feet near the former <br /> I location of TK4 . The floor of the excavation was extended from <br /> the original tank excavation depth of approximately 13 .5 feet to <br /> a final excavation depth of approximately 15 .5 feet. Excavated <br /> soil was visually inspected for petroleum staining and screened <br /> with field detection equipment (Organic Vapor Analyzer - OVA) . <br /> No petroleum staining, odors or OVA readings were noted during <br /> the over-excavation. Excavated soil was stored south of the <br /> excavation in Stockpile No. 3 as shown in Figure 2 , Appendix B. <br /> �� CONDOR <br />