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07/21/95 TUE 14:11 FAX GROUNDWATER r d'� FLUOR DANIEL *'7b July21, 1998 Mr. Michael WO San Joaquin County Public Health Services 304 E. Weber Avenue, 3rd door Stockton, California 95202 Subject: Soil Disposal and Excavation Southland 7 -Eleven Store # 14117 2725 Country Club Boulevard Stockton, California Mr. Kith: As requested, Fluor Daniel GTE, Inc. submits this letter to document the transportation and disposal of tank overburden soil generated during the removal of the three 10,000-galian underground storage tanks (USTs) at the subject site_ In additon, this letter addresses the additional soil excavated from the bottom of the UST excavation. On July 15 and 16, 1996, approximately 278 tons of LIST overburden sol was removed from the subject site- The sail was transported prior to the tank removal due to site constraints which made it difficult for tie contractorto continue working. The soil was loaded onto trucks operated by Cross Trucking of Forestville, CA (Haz Mat # 3250) working as a subcontractor for Belshire Environmental of Lake Forest, CQ The soil was hauled under a non -hazardous waste rnantestto T.P.S. Technologies, Inc. in Richmond, CA for proper treatment and disposal (See attached). Upon arrival of the soil to T.P.S., one sal sample was collected from the from the 278 tons of soil by T.P.S. personnel and submitted to Weck Laboratories, Inc- in Industry, California frit analysis. The sample was analyzed for benzene, toluene, ethylbenzene, total xylenes (BTEC, methyl-tert-butyl ether (MTBE), total petroleum hydrocarbons-a"asoline CTPH G), and total petroleum hydrocarbons -as -diesel (iPH-D). BTEX and MTBE were not detected in the sample collected (soil sample ID 9818258). TPH-G and TPH-D were detected at r oro ntralions of 152 mUft and 42.9 mg/kg, respectively (See attached). The reason for transpo ng the soil prig, to sampling was to respond quickly to the contractors request to remove the soil due to site constraints. Since hydrocarbort4mpacted sob is very rarely handled as hazardous waste, the soil was transported under a non -hazardous waste manifest. An additional 40 cubic yards of sail was excavated frorn tie bottom of the lank pit following the removal of USTs. The soil was excavated to allow for the placement of two feet of solid base rock beneath the water in the tank pit far snit compaction purposes only. The soil was not excavated for the purposes of removing hydrocarhan-impacted soil. The deavon to excavate the bottom of the former tank pit was made by the 757 Arnold Drive, Suite D / Mudinez, CA 94553 USA (51C) 37x3990 FAX (510) 3703991 0 I;1002