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f <br /> RAMAGE <br /> ENVIRONMENTAL,INC. <br /> 465 S. Meadows Pkwy,Ste.20'PMB 157. <br /> Reno, NV 89521 <br /> Tel (775) 851-7239 <br /> Fax(775)851-7240 <br /> December 20, 2006 D <br /> DEC 2 2 2006 <br /> ENVIRONMENT HEALTH k <br /> Mr. Harlin Knoll, Sr. R.E.H.S. pER(01IT/SERVICES <br /> San Joaquin County EHD ' <br /> d <br /> � <br /> 304 East Weber Avenue, 3 Floor . <br /> Stockton, CA 95201-0388 <br /> Re: Tier 1 Environmental Screening Levels for Closure Justification <br /> Catholic -Cemetery, Stockton <br /> San Joaquin C , California <br /> Global ID# T0607700348, USTCF Claim#1092 <br /> Dear Mr. Knoll: k <br /> It was a pleasure to speak with you this week regarding the above-referenced case. As J <br /> you indicated, the San Joaquin County Environmental Health Division (EHD) and the <br /> Central Valley Regional Water.Quality Control Board(RWQCB) require the completion ' <br /> of a Tier 1 Environmental Screening Levels (ESL) analysis, before final case closure <br /> consideration.,:-On July 28,.2006, on behalf of_the.San,Joaquin Catholic Cemetery. <br /> (responsible party and property owner), Ramage-Environmental,.Inc.'submitt ed.Site <br /> Conceptual Model and Requestfor.Case Closuie for regulatory review. _ <br /> 1 <br /> e <br /> Enclosed are the Tier 1 ESL resdlts for methyl tertiary butyl ether (MTBE) in soil and <br /> groundwater beneath the site. The soil input of 0.1 milligram per kilogram (mg/kg) is the <br /> highest concentration reported in the;confirmation soil boring CPT-lA, drilled in August <br /> 2000, through the former UST excavation. The groundwater input of 52.1 micrograms i <br /> ,rer liter (t.Ig.n).is the highest concentratron rPported.in the most recent: groundwater <br /> r <br /> sampling event on Decembers T5 2065. <br /> l <br />' As indicated in the enclosed output, the ESLs for vapor emissions to indoor air are not <br /> exceeded. The ESLs were exceeded for soil leaching to groundwater, and for toxicity I <br /> and gross contamination in groundwater. Since the monitoring well network defines the 1 <br /> extent of impacted groundwater to beneath the site, and the concentration of MTBE in <br /> groundwater is projected to attenuate to below Maximum Contaminant Levels (MCL) � <br /> prior toheneficial use; these concerns should be considered adequately addressed i 1 <br /> I <br /> L1 <br /> - f <br /> { <br />