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.i <br /> tip <br /> Working To Restore Nature <br /> 93 JUL - 8 PH 2: 35 <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Phone: (916) 852-6690 <br /> FAX: (916) 852-6688 <br /> July 7, 1993 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> Subject: Excavation and Handling of Soil During Replacement of the Underground <br /> Storage Tanks at ARCO Service Station No. 2130, 7609 North El Dorado <br /> Street, Stockton, California. <br /> Mr. Infurna: <br /> At the request of ARCO Products Company (ARCO), RESNA Industries (RESNA) is <br /> submitting this letter outlining soil excavation activities associated with the replacement of <br /> the underground storage tanks (USTs) at the subject site. Based on site investigations <br /> performed at the site, hydrocarbons may exist in soil beneath and adjacent to the USTs. <br /> If hydrocarbon-impacted soil is encountered during the tank replacement operation, ARCO's <br /> contractor will over excavate the tank cavity in an attempt to remove the impacted soil. <br /> Over excavation will be limited laterally due to the location of the tank cavity with respect <br /> to the station building, property limits, and monitoring and vapor extraction wells. The <br /> vertical extent of over excavation (if warranted) will be approximately 16 feet. We estimate <br /> that approximately 750 cubic yards of soil may be generated during tank removal and over <br /> excavation. <br /> Soil removed from the tank cavity will be stockpiled onsite and covered with plastic. <br /> Samples will be collected from the stockpiled soil and submitted to a State certified <br /> laboratory for compositing (one composite per 100 cubic yards) and analyses. The soil will <br /> be analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, <br /> ethylbenzene, and total xylene isomers (BTEX) using total contaminant leachate procedure, <br /> reactivity, corrositivity, ignitability, and soluble lead using EPA method 8015, EPA Method <br /> 1311, and EPA method 6020, respectively. Results of analyses will be used to evaluate <br /> disposal options. <br /> 30003-7 <br />