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INTERNATIONAL <br /> TECHNOLOGY <br /> CORPORATIONrF <br /> 0 C T 0 9 199' <br /> October 3, 1991 ENVIRONMENTAL I <br /> PERMIT/SERVIC <br /> Mr. Mike Infurna <br /> Public Health Services - San Joaquin County <br /> Environmental Health Division <br /> 445 N. San Joaquin <br /> Stockton, CA 95201 <br /> Addendum to "Soil Remediation Proposal" <br /> IT Corporation, July 1991 <br /> BP Oil Station #11190 <br /> 1206 March Lane <br /> Stockton, CA <br /> Dear Mr. Infurna: <br /> The following is an addendum to the above referenced document, as per our conversation of <br /> October 2, 1991. It is our understanding that this site will be covered under the San Joaquin <br /> County "Limited Excavation Policy", if we provide you with certain additional information. <br /> The three items we discussed were: over excavation, disposal, and subsequent soil boring <br /> activities. These items will be discussed separately in the following sections. <br /> Over Excavation <br /> During excavation procedures, the tanks and all associated backfill material will be removed. <br /> If any hydrocarbon impacted soils are encountered beneath the backfill, these areas will be <br /> additionally excavated to a maximum depth of 12 feet or 2 feet into native material <br /> (whichever comes first) with the amount of over excavated soil totaling no more than 50 y&. <br /> Figures 1 through 4 show the anticipated excavation limits and anticipated over excavation <br /> limits. Potential over excavation zones were identified based on inspection records which <br /> revealed tanks 2 & 5 have failed pressure tests and that the dispenser located at the east end <br /> of the outer pump island had (at one time) a cracked impact housing. <br /> Adjustments may be made in the field with the approval of the onsite San Joaquin County <br /> Health Department representative. <br /> Regional Office <br /> 4585 Pacheco Boulevard•Martinez,California 94553•415-372-9100 <br /> IT Corporation is a wholly owned subsidiary of International Technology Corporation <br />