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u1/44/ t 57 I UO 40 1byy4115(4 ' LEARNER CO <br /> PAGE 06 <br /> H EARNER OMPAN <br /> SCRAP <br /> METALS <br /> 2741 NAVY DRIVE STOCKTON, CA 95208 <br /> (209)948 3198 <br />' Surae 4, 2001 <br />' Harlin Knoll, Semon-REHS, <br /> LOP/Site Mitigation Unit IV <br />' Environmental Health Division <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CaU£ornla, 95202 <br /> Subject: 2711 Navy Drive,Local Ovenight Program Site Code: 1204 <br /> Limited Solt and Groundwater Sampling Report—Contaminant <br /> Calculations <br /> Dear hex Knoll <br /> This transmittal is a follow-up to our recent telephone conference in which you requested <br /> that The Learner Company provide an estunate of the mass of all contaminants ro the soil <br /> and groundwater related to the subject project The attached spreadsheet presents the <br /> requested information ,Also,for ease of renew, we have attached plot plans with <br />' cozntarknnant concentrations and isopleths/areas used in the calculations <br /> The soil volume calculations are conservatively assumed to .represent a 5-foot depth <br /> interval as are the groundwater volume calculations for all corn utuents <br /> As discussed in the Limited Sad and Grounrhvarter Sampling Report transmittal letter, <br />' appro2nmately 93 cubic yards of impacted soil that was excavated during the tank <br /> removal process was characterized on Deceruber 19, 1996 and,with approval from the <br /> EM, was used to backfill the excavation In genera], based on the laboratory analytical <br />' data and the locations of the borings,the majority of the contan=atron remains within <br /> the linut of the former UST excavation(and within this backfilled mlatenal), due to the <br /> ;bane-Brained nature, and related low permeability of the native soil Therefore, the <br /> attached calculations account for this area vndrvidually by impact and depth As shown <br /> A.0 am sr ORDPaS oda101 doc <br /> 1 <br />