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s <br /> C A M B R I A <br /> October 15, 1998 <br /> Mr Jeffrey Wong <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95826 <br /> Re Closure Request <br /> Shell-Branded Service Station <br /> 4315 Waterloo Road <br /> Stockton California <br /> WIC 204-7524-2804 <br /> Dear Mr Wong <br /> As you requested in your September 4, 1998 leder, Cambria is submitting this closure request <br /> for the site referenced above on behalf of Equiva Services LLC (Equiva) Presented below are <br /> a brief investigation history, a discussion of hydrocarbon distribution, hydrocarbon mass <br /> calculations, and our rationale for requesting closure <br /> Investigation History <br /> 1994 Tank Removal Sampling. Hydrocarbons were detected in soil during tank and p,ping <br /> replacement sampling performed by Fugro in December 1994 A total of 690 cubic yards of <br /> hydrocarbon-bearing soil was excavated from the tank excavation and from beneath the <br /> dispenser islands Sample location figures are presented in Attachment A and analytic tabies <br /> are presented in Attachment B <br /> 1996 Soil Borings During February 1996, Enviros, Inc (Enviros) drilled and sampled ten <br /> soil borings to depths ranging from 6 to 37 feet below grade (fbg) No ground water was <br /> encountered in the borings Sediments encountered were primarily silty sands, silts and clays <br /> Oakland CA Boring location figures are presented in Attachment A and analytic tables are presented in <br /> Sonoma CA Attachment B <br /> Portland OR <br /> Seattle WA <br /> Hydrocarbon Distribution In Soil <br /> Cambria <br /> Environmental Based on the dispenser sampling and soil boring analytic data, it appears that hydrocarbons <br /> Technology, Inc <br /> are limited to areas immediately adjacent to the former tanks and dispensers The majority <br /> fo Perkins Street <br /> P O Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935'6649 <br />