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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> : Unit Supervisors <br /> N: .< Donna K.Heran,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,Douglas W.Wilson, <br /> S.,R.D.I. <br /> ' R.E.H.S. <br /> cq�ikoR�'�PProgram Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,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-K-GCH ETETTA-- JAN 142005 <br /> OLYMPIAN bALT—PRePERTTE_S_ <br /> _2Fi.0--MICHELE-COUR7' ,2o C Q A 14m-e c�0 G S FU E g A S Su , fi� 24 Z <br /> SQU=H_ S CO—CA —9 4 0-8-0-62-9-7 Sir rr�a_f? 0/ C.q� (?44 03 <br /> RE: JIMCO TRUCK PLAZA SITE CODE: 1604 <br /> 2—Z rrO n faJ c. r',oa <br /> Ripon, California Jd r, • 19 2dc7., <br /> J ti�yy <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 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 applopiiate, 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 />