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FEB-09-2005 14:43 CAMBRIA 1707 935 6649 P.01/02 <br /> ENVIRONMENTAL HEALTh DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Carl Borg <br /> Donna K.Heran, <br /> 304 East Weber Avenue. Third Floor C, man, RX <br /> Al Olsvn,R.E.H.S. Stockton, California 95202-2708 <br /> DO Mikc Huggins,R.E.H.S..R.W. <br /> V 1)011glas W. Wilson, <br /> Telepholie: (209) 468-3420 Margaret Laprio,R.E.H.S. <br /> (.auric A.Cotullu,R.E.H.S. Fax: (209) 464-0138 Robert McCl�eilon,R1.1i S. <br /> Program Manager Mark Darccllo';,R.E.H.S. <br /> -7- 1 C)2.?- <br /> OLYMPIAN Project No. B 0 2 2009 <br /> 2000 ALAMEDA DE LAS PULGAS RPT <br /> BF,— <br /> SUITE 242 <br /> SAN MATEO CA 94403 <br /> RE: JIMCO TRUCK PLAZA SITE CODE: 1604 <br /> 1022 Frontage Road (Formerly 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 litbology 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 GeoEhvironmental, Inc- (AGE) recommends that a soil <br /> vapor extraction system (SVE) and,potentially, an air sparging program be implemented <br /> at binco 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 operation at Ripon Farms Services <br /> (RFS). However,the,SVE system must be designed based on the site lithology at Jimco, <br /> Truck Plaza, which appears to have a higher proportion of fine-grained soil compared to <br /> the RFS site. EHD also recommends that you assess this site and, if appropriate, conduct <br /> an in-situ air sparging pilot study also. Please submit a work plan to EHD for the SVE <br /> pilot study and, if appropriate, an air sparging system by March 25, 2005. <br /> Further investigation to assess the vertical extent of impacted soil and groundwater in the <br /> location of the former underground storage tanks, and the lateral extent of impacted <br /> groundwater west of monitoring wells MW-8 and MW-9 should be conducted <br /> concurrently with the proposed work. A corrective action plan may be submitted after <br /> the site assessment has been completed. Please submit a work plan to EHD by March 25, <br /> 2005, that will address the additional vertical and lateral delineations- <br /> paiwt-Fax Note 7671 <br /> paged. <br /> FEB 2005 <br /> 6)N 5C MgAk From <br /> 00JDCrPt. <br /> Phone 8 Phone# <br /> Fax 9 —\MW Fax 0 <br />