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SECOR Mi�gt,R,600 Suite 100 <br /> INTERNATIONAL Rancho Cordova CA 95670 <br /> S E C ® R INCORPORATED 916 661 0400 TEL <br /> 916 661 0430 FAX I <br /> I ,�I <br /> December 19, 2002 <br /> I <br /> Mr Michael lnfurna <br /> San Joaquin County 1 <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE Contingency Plan for Over-Excavation Following Removal of the UST <br /> Chevron Bulk Terminal 100-1621 �Y1 <br /> 22888 S Kasson Road <br /> Banta, California <br /> SECOR Project No 77CH 11621 07 <br /> �e <br /> Dear Mr lnfurna it <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management kk <br /> Company (Chevron), has prepared this work plan for the over-excavation of soil associated with the i, <br /> abandonment of an underground storage tank (UST) at the site referenced above (Figure 1 and 2) <br /> A 1,000-gallon UST (tank ID 1842-6) is scheduled to be removed by a Chevron-approved contractor hail <br /> during January 2003 Chevron proposes limited over-excavation of the tank pit area if impacted soil <br /> is observed This plan describes limited over-excavation and sampling procedures, as a contingency <br /> for removing any Impacted soil observed in the tank pit area � <br /> SECOR has prepared a Site-Specific Health and Safety Plan as required by the Occupational Health `r <br /> and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency g <br /> Response" guidelines (29 CFR 1910 120), and by California Occupational Health and Safety <br /> Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response"guidelines " <br /> (CCR Title 8, Section 5192) The Site-Specific Health and Safety Plan will be reviewed by the staff <br /> and subcontractors before beginning field operations at the site <br /> SCOPE OF WORK <br /> fm <br /> The following activities will be completed after the removal of the underground storage tank <br /> oil <br /> Limited Over-Excavation If visibly impacted soils are encountered upon exhuming the UST, r r <br /> limited over-excavation may be performed Removal of affected soil will be limited to accessible 1,14, <br /> areas (not under or potentially undermining existing structures, accessible to onsite construction .�, <br /> a <br /> equipment without shoring, benching or other stabilizing measures, and limited to possible <br /> encountered groundwater) The objective of the limited over-excavation activities is to remove <br /> secondary hydrocarbon sources in soil No more than 500 cubic yards of visually-affected soil will be <br /> excavated Post excavation soil samples will be collected from the over-excavated area <br /> Post Excavation Sampling Following over-excavation activities, SECOR will be onsite to observe <br /> and collect samples Soil and groundwater samples will be collected in areas where visually-affected <br /> materials have been removed Soil samples will be collected using a drive sampler and 2-inch by 6- I <br /> inch tubes, capped with Teflon sheets and tight-fitting plastic caps Groundwater samples will be <br /> collected using a disposable bailer and placed in appropriate containers All samples will be <br /> preserved on Ice and accompanied by chain of custody manifest for shipment to the laboratory <br />