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IKO <br /> TANK CLOMIZE RVORT <br /> aZ 7910 Lower 8acmunnto(toed <br /> 3tO&tod,C&UGrn3a <br /> Doha Pmjset No.40-a8-147 <br /> gaga 4 <br /> '" �.S�ite Geala¢v <br /> Subsurface geology at the site has been characterized from drilling eight soil borings. Soil borings <br /> B-1 through B-4 were drilled near the ymisting underground storag,:tanks. Soil borings B-S through <br /> B-8 were located and drilled within the proposed location for the new tanks. <br /> tit <br /> r <br /> All eight soil borings encountered a silty clay layer approximately 3 feet thick below the asphalt <br /> pavement. Below the silty clay, the borings encountered layers of clayey silt(ML),silty clay(CL), <br /> and sandy silt(ML). Soil boring B-7 encountered a lease of silty sand(SM)between 4 and 1 I feet, <br /> Vit'! <br /> and soil boring B-8 encountered fine to medius`sand(SP)between 8 and II feet. <br /> 4.0 SAWI.ING ANI.1 LABORATORY TESTi<NfG LPRQ:EOCDL <br /> d.I_ aniplin¢-Er�tocol <br /> � . <br /> The soil sampling was directed by a Delta geologist. A brass sampling tube was used to collect soil <br /> _ samples at both the fill and nonfill ends of each tank,approximately 2 feet below the bottom of the <br /> tFtnk excavaron. Nine soil samples were collected at 20-foot interva:s along the excavated prnduct <br /> pipe trenching anL frum jeneath each product dispens�;r. The samples were visually and manually <br /> classified in the field in accordance with ASTM: 2488-84. <br /> 1� 4.2 Laboratory Analyse <br /> Soil samp,es retrieved from the former tank excavation,the new tank excavation,and the product <br /> line trenches were sent to Eureka Laboratories, where they were analyzed for the following <br /> 4tx - constituents,BT%,.TPH, EDB,and organic lead. <br /> 1 � <br /> 5.0 QN y5 >Y f»INDiN � <br /> Delgrinflon of Removal Process <br /> ` Delta .Bay Builders excavated and removed the four underground storage tanks on <br /> is December 20, 1988(Figure 2). The tanks were buried approximately 3 feet below ground surface. <br /> The tanks were purged with dry ice-to-reduce the risk of explo:.ion during-removal and transport:-- -- <br /> 4j <br /> Kasey Foley of San Joaquin County,Environmental Health Depactmert,issued a permit and merited <br /> esch tank with the number 391660. The tanks were transported to Triangle Construction, Inc., in <br /> Sacramento,California, for :heir final designation. <br /> 11Z. 46` <br /> s tt <br /> �?, <br />