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Geological ' g cal Audit Services, Inc. • _ _ Wim= Environmental Professionals v low 1803 March Lane, Suite A•Stockton, CA 95207-6414• (209) 956-0264•Fax (209)956-0700 December 7, 1994 SC-92-08-061-02 Mr Ed Gotelli MID-CAL LEASING 1856 N Broadway Ave Stockton, CA 95205-3060 Subject: Addendum to Revised Closure Summary Report Mid-Cal Leasing 1649 East Channel Street, Stockton, Calirornia Dear Mr Gotelh In accordance with the request of Ms Mary Meays of the San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD), Geological Audit Services, Inc (GeoAudit) has prepared this addendum to the Revised Closure Summary Report (CSR) .� dated October 12, 1994 1.0 REMAINING IMPACTED SOIL Revised estimates (see attachment)indicate that approximately 127 cubic yards of impacted soil remain at the site Using the available four pieces of data, the average concentration of the remaining impacted soil can be calculated to be 4 38 parts per million (ppm) Using the calculated volume of impacted soil (127 cubic yards), the total volume of remaining hydrocarbons at the site is calculated to be 0 22 gallons (less than one quart) 2.0 PROJECT COSTS Mid-Cal Leasing has spent approximately $180,000 to date, for the assessment and remediation of hydrocarbon impacted soil and groundwater at the site A total of approximately 1,200 cubic yards of soil were excavated to a maximum depth of 39 feet. The soil was characterized and disposed at a licensed landfill. The excavation was then backfilled With such extremely low concentrations of hydrocarbons, existing soil remediation methods are probably not feasible or cost effective Soil remediation methods that could be employed at the site include vapor extraction or excavation and treatment/disposal 1 Full Spectrum Environmental Services- Hydrogeology