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. <br /> R- -,•"=�jr ,�� n �, _ s _3 - $ .fit .M <br /> r <br /> rw+ <br /> AN <br /> w <br /> IROBLEA!ASS S5 N1'R POit� <br /> Shell Scrvica Station <br /> 7910 Lewey Sacramento Road,Stockton,California <br /> Shall WIC No,204-7524.0808 <br /> Delta Project No.40.88.147 <br /> Page 4 <br /> r w <br /> i <br /> TABLE 1 <br /> Undergound Storage Tank Information <br /> Tank Size Product Approximate <br /> Mans Sred Construction <br /> I toAce in Yeats --TMC- <br /> 8,000 <br /> me_8,000 Super unleaded Unknown <br /> 5.000 Regular unleaded Unknown Stc,I Removed <br /> Steel Removed <br /> 5,00 0 Regalar lar un ended Unknown Steel Removed <br /> Unknown <br /> 10,000 Super unleaded 2 Steel Removed <br /> l 10,000 Regular unleaded Rouble-walled fiberglass Active <br /> ID,000 2 Double-walled fiberglass Active <br /> Regular unleaded 2 Double-walled fiber <br /> q <br /> &lass Active <br /> Imo: 2.a Tan lastrr�Results <br /> On December 20,1988,the four steel underground storage tanks were excavated,removed,and transported f <br /> to Triangle Construction,Inc,Sacramento,California. Eight soil samples were obtained from the bottom <br /> 1, of the excavation and sent to Eureka Laboratories, Inc., for chemiral analysis of benzene, toluene, <br /> athylbenzene,xylenesB <br /> ( TEX),and total petroleum hydrocarbons(TPM,ethyIene dibromide(EDB),and <br /> tetraethyl lead (TEL) concentrations. The results indicated that the soils beneath the hvo 5,000 gallon <br /> s unleaded regular tanks contained petroleum hydrocarbons at a depth of 15 feet <br /> A summary of the chemical analysis is presented in Table 2. Soil sample identification and Iocations are <br /> €' <br /> shown in Figure 2. Concentrations of TPH ranged from nondetected in samples T-1,T-2,1=3,and T-4 to <br /> t 4,880 parts per million(ppm)in T•5; 4,790 ppm in T_6;_I 500 ppm in-T-7:and 120 ppm is T-8.--- – - <br /> --Two hundred cubic yards of soil and backfill were excavated front the former tank location and temporarily <br /> stockpiled on site Approximately.100 cubic yards of this soil were used to backfill the former <br /> excavation <br /> w <br /> . on January 20,1989 The remaining 100 cubic yards of sail, lus 60 cable <br /> P yards of sail from the product line <br /> trenches were stockpileand sampled on January <br /> f ' � d 25,1989. Five composite soli samples were obtained and <br /> � sent to the laboratory for chemical analysis of <br /> BTEX, TPH, EDB, and TEL The soil samples were <br />