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• 3035 Prospect Park Drive <br /> MGe( Suite 40 <br /> ATURATEMPTrans, Inc. Rancho Cordova, CA 95670-6070 <br /> www.geotransinc.com 916-853-1800 FAX 916-853-1860 <br /> June 27, 2001 c <br /> P:\PROJECTS\Safeway\L354\101-Tracy_scrPh2\101_SanJoaquin_EHD.doc <br /> N <br /> D <br /> Ms. Margaret Lagorio <br /> PHS-EHD ° `_- <br /> San Joaquin County <br /> 304 E. Weber Street, 3rd Floor p <br /> Stockton, California 95202 Q <br /> RE: RESULTS OF SCREENING LEVEL PHASE II ENVIRONMENTAL ASSESSMENT <br /> PROPOSED GAS STATION PAD AT THE PROPOSED SAFEWAY STORE <br /> 1950 WEST 11 T"STREET, TRACY, CALIFORNIA <br /> PERMIT SR#0026016 <br /> Dear Ms. Lagorio: <br /> In accordance with the San Joaquin County data reporting provisions contained in the soil <br /> boring permit application, attached are results of the recently completed screening level soil and <br /> groundwater assessment performed at the subject site. Grab-groundwater samples were <br /> collected using a Geoprobe rig. <br /> A copy of a boring location map, the chain-of-custody form and laboratory analytical data <br /> sheets, and a data summary table are attached. <br /> The laboratory results (Table 1) indicate that a methyl tertiary-butyl ether (MTBE) concentration <br /> of 13 ug/L, which equals the Regional Water Quality Control Board's Maximum Contaminant <br /> Level for MTBE, was detected in the grab-groundwater sample from Boring SB-4, located <br /> adjacent to West 11`h Street. MTBE was not detected in the other three grab-groundwater <br /> samples collected nearby. There is no known source of MTBE on the undeveloped lot. A <br /> Chevron gas station is located at the southeast corner of Corral Hollow Road and West 11`h <br /> Street, directly across the street and in the presumed up-gradient location from Boring SB-4. <br /> Our client, Safeway Inc., is planning to proceed with site development and installation of a <br /> gasoline station at this location. Safeway seeks confirmation from the County that 1) the one <br /> MTBE detection in groundwater at Boring SB-4 will not trigger additional action on the part of <br /> Safeway; and 2) the presence of MTBE in groundwater at SB-4 is a pre-existing condition not <br /> caused by Safeway. <br /> Please reply to Tim Costello at GeoTrans. Thank you for your assistance. <br /> Sincerely, <br /> GeoTr% <br /> Tim Costello Don Lee <br /> Senior Scientist Project Geologist <br /> Attachments <br /> cc: Messrs. Todd Paradis and Jeff Brown, Safeway Inc. (without attachments) <br />