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1386 EAST BEAMER STREET <br /> ES7ERN WOO D. CA 95695-4603 <br /> ENGINEERS F r Ax (916)662-0273 <br /> CALIF CONTRACIiOR 0 513857 A CORPORATIONht ,t�# ' `tib' (916) 668-5300 <br /> REGISTERED GEOLOGISTS 0 CS <br /> Mrs. Diane Hinson, REHSUS�4�v1f_UiAOylRb ear 7, 1991 <br /> San Joaquin County Environmental Healt�;VMFZ%jk�/ <br /> PO Box 2009 �� <br /> Stockton, CA 95201 <br /> RE: dI3 � I.1asha .ow, va�or� extractson� el.s, and� c pletion <br /> r ac .on"Y�o 's"so I ` et`io1z� � XKA1-ry 4'O-1'1',-rfC it - - <br /> �, gg Regal Station 604, 1448 N. E1 Dorado Street, Stockton, <br /> Cali'inia, Figures 1 and 2. <br /> jDear hrs. Hinson: <br /> Western Geo-Engineers has completed the first phase of remediation <br /> to the above mentioned site, removing aged gasoline range <br /> hydrocarbons from the soil in the vadose zone beneath the tank <br /> field and pump island areas. This finalized the clean-up of <br /> contaminated soil at this site. The removal of the hydrocarbon <br /> contaminants from the soil was performed in two phases: PHASE I, <br /> i Overexcavation and aeration. PHASE II, In-Situ Vapor Extraction. <br /> Phase I. <br /> OVEREXCAVATION AND AERATION OF CONTAMINATED SOIL. <br /> SITE HISTORY <br /> Five 10,000 gallon carbon steal single walled tanks were removed <br /> from the site on September 26-28, 1989. The tanks were designated <br /> as and contained the following: T1 (ID# 39-1081-1)--nearest <br /> building, premium unleaded gasoline, T2 (ID# 39-1081-2)-north of <br /> T1, regular gasoline, T3 (ID# 39-1081-3)-north of T2, regular <br /> gasoline, T4 (ID# 39-1081-4)-north of T3, unleaded gasoline, and <br /> T5 (ID# 39-1081-5)-north of T4, unleaded gasoline. Only tank T4 <br /> ` showed any idication of failure, the bottom of the fxllup end had <br /> corrosion with possible pin hole leaks. <br /> Sampling of the tank excavation occured on September 29, 1989 and <br /> 4ampling of the product line trenches occuring on October 5, 1989, <br /> see Table 1 and Figure !A. <br /> over excavation of the tank excavation occured and was sampled on <br /> June 26, 1990. The excavation was expanded vertically to the 25 <br /> foot depth. The pump island area was demolished and over <br /> excavated to the 13 foot depth on August 22, 1990, with samples be <br /> i obtained on that date, see Table 1 and Figure 4B. These two over <br /> excavations removed the contaminated soil from beneath the tank <br /> field and the center pump island. The eastern and western pump <br /> island excavations were expanded and deepened on September 6, 1990 <br /> to the 20 foot depth and sampled, see Table 1 and Figure 4C. <br /> During all over excavations a HNu photoionizing detector was used <br /> to field screen for the presence of contaminated soil or more <br /> page 1 <br /> i <br /> 'Ali fe <br />