SITE INFORMATION AND CORRESPONDENCE

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TH } _ _VUBLI4EALSER CE - ( u( . SAN JOAQUIN COUNTY iS ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, X.I)., M.P.H., Acting I'fealthl Officer •= _'• �. 344 E.Weber Ave., Sed Floor r i P. O. Box 388 Stockton,CA 95201.0388 r� a 209l468-3420 a It TOM MASW i �.. FEDERAL DEPOSIT INSURANCE CORP MLW OST:0 4 1995 MAIL STOP J 658A-61 :P O BOX 7549 NEWPORT BEACH CA.:92658-7549 � a. RE.- Togo's Restaurant S.M.:,CODE ;9:149 305 South Hutchins<Street ; - y p (PAR) as prepared by GeoCon and'I have: I Ixa.a reviewed th#receedl submitted"'Problem Assessment'Report" the following comments,. li+.ly research on public and:private.wells.lit the immediate area of this site has indicated that approximately::1200:: feet north:east of this:site,:a grogoOater'depth of 40.17 feet below ground;surface was recorded on.-March. 1986::from:a:well. utder East Bay:Municipal Utilities District's:;contral;!i San.Joaquin County.Flood Control records indicate the:.highest seasonal groundwater during the last ten (10)years:occur-ed during this same Per* r PHS-EHD will.use this..depth.to.water for calculations in evaluating whether or not contatninated �oi1s from onsite sources:could have-iimpacted groundwater, In order to evaluate potential sources to groundwater and possibly concur with your suggestion 01hat::chemical compounds in groundwater have.migrated to beneath the site from off site locations", additional site snaps with, soli iso-concentration lines at-multiple depths will need to be submittedto PHS-EHD. Separate site maps.with contour.lines for TPH as both Gasoline and Diesel, as well as for the BTEX constituents, should be:subrriitted for all depths where data has been collected:. i i Also needed are any photos that may be at the City of Lodi archives that may be able to show site conditions i from the 1920's, 1950's,and later. Both above and underground storage tank usage at these time periods need to: be evaluated also. My evaluation of sail contamination at various depths indicate the possibility of multiple sources at different locations on site. Depths to:water for these periods:will also be needed in order to better evaluate your suggestions. In order to comment on chromatogram pattern conclusions suggested within the PAR,PSIS-EHD will need these documents to be submitted for evaluation. Please include them along with the other requested items. PHS-EHD currently does not evaluate MTBE in investigations of leaking underground storage tanks. In order to 1, substantiate your suggestions that the presence of this compound in the igroundwater beneath your site is from an ' offsite source, you will need to provide information that details the interactions of MTBE in soils and groundwater.Also included should be acceptable methods for successfully capturing this ether-based compound in sandy soils for accurate analysis. PHS-EHD will evaluate your submittals and comment at the meeting you have requested. ' PHS-EHD;is concerned that Benzene was detected in vapor samples afte' the vapor extraction rate was increased in V'W-6. ;Historical evidence of 1926 and 1950 site usage indicates that the north-east comer of the site housed the main building of a service station. Current investigation in this area has been limited and soil contamination data for this area is incomplete. Conclusions for the presence of Benzene need to be presented or investigation ' in this area-needs to be expanded:so that conclusions may be,reached. ' A Division of San Joaquin County Health C are Services r. t -