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ENVIRO "j <br /> NMENTAL HEALTH DEPARTMENT <br /> PQ•U�N <br /> = SAN JOAQUIN COUNTY <br /> r. ;�—cam--v :c <br /> a: ?, Donna K.Heran,R.E.H.S. unit supeivt.sors <br /> •, Z { Director <br /> 304 East Weber Avenue, Third Floor Carl Borginan,R.E.H.S. <br /> Al Olsen,R.E.H.S.c Stockton, California 95202-270$ Mike Huggins,R.E.H.S.,R.D.I. <br /> q _..• � Program Manager- Telephone: 20 <br /> ` FOR� p ( 9) 468-3420 Douglas W.Wilson,R.E.H.S.Laurie A.Cotulla,R.E.H.S. Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> DAN KOCH AND FRED BERTETTA JAIL 142005 <br /> OLYMPIAN GALT PROPERTIES <br /> 260 MICHELE COURT <br /> SOUTH SAN FRANCISCO CA 94080-6297 <br /> RE: JIMCO TRUCK PLAZA SITE CODE: 1604 <br /> 22502 S. Highway 99 <br /> Ripon, California <br /> San Joaquin County Environmental Health Department(EHD)has reviewed analytical <br /> results for groundwater samples collected in July 2004 and monitoring-well groundwater <br /> levels at the above-referenced site; soil lithology at this site; and analytical data collected <br /> at the adjacent Ripon Farm Services site where soil vapor extraction (SVE) and an in-situ <br /> air sparging system were in operation intermittently from November 2000 through <br /> November 2004. Advanced GeoEnvironmental, Inc. (AGE) recommends that a soil <br /> vapor extraction system (SVE) and, potentially, an air sparging program be implemented <br /> at Jimco Truck Plaza as an interim remediation measure to mitigate soil impacted with <br /> benzene, toluene, ethyl benzene, and xylenes (BTEX), and methyl tertiary-butyl ether <br /> (MTBE). <br /> EHD approves a soil vapor extraction pilot study at Jimco Truck Plaza after observing a <br /> significant mass reduction of BTEX; total petroleum hydrocarbons as gasoline,total <br /> petroleum hydrocarbons as diesel, MTBE, di-isopropyl ether, and tertiary butyl alcohol <br /> that apparently resulted from the soil vapor extraction <br /> tsRip <br /> e lithologysat JimServlc° <br /> ces <br /> (RFS). However, the SVE system must be designed based on the <br /> Truck Plaza,which appears to have a higher proportion of fine-grained soil compared to <br /> the RFS site. EHD also recommends that a°e submit alwork plau assess ths site n to EHDp <br /> pfor the SVE ct <br /> an in-situ air sparging pilot study also. Please <br /> pilot study and, if appropriate, an air sparging system by March 25, 2005. <br /> water <br /> Further investigation to assess the vertical extent of <br /> the laterallexten and groundof impacted n the <br /> location of the former underground storage tanks, <br /> groundwater west of monitoring Wells A orrecty e4a tion plant may be d be submitted after <br /> concurrently with the proposed work. <br /> the site assessment has been completed. Please slateral itdelineations- <br /> k plan <br /> o EHD by March 25, <br /> 2005, that will address the additional vertical <br />