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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> .�• o Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> Carl Borgman,R.E.H.S. <br /> �.R,• 304 East Weber Avenue,Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Lam= Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> atir6-til <br /> Laurie A.Cotuila,R.E.H.S. Fax: (209) 464-013$ Robert McClellon,R.E.I-I.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> TERRY TARDITI � J ZQQ4 <br /> 11395 HWY 99 N SCANNE Di <br /> LODI CA 95240 <br /> RE: `T&-T—Truckingjnc, Site Code: 1627 <br /> 11396 Hwy 99 Frontage Rd N. RO#: 538 <br /> Lodi, CA. 95240 CUF#: 015089 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Subsurface Investigation Results and Site Conceptual Model submitted by Brown <br /> F and Caldwell on June 28, 2004 and has the following comments. <br /> This report covers the Cone Penetration Testing (CPT) borings place onsite last <br /> June 2003. The seven CPTs were advanced to 130 feet below ground surface <br /> (`bgs) in an attempt to define the lateral and vertical extents of the petroleum <br /> constituents released from the former underground storage tanks (UST). Grab <br /> ground water samples were collected from three permeable zones identified by <br /> the CPT equipment. Soil samples were collected and analyzed from only one <br /> boring, CPT-1, and data from this boring indicated that MtBE was detected at 10 <br /> mg/kg at the deepest sample depth, 65' bgs. Low levels of other petroleum <br /> contamination were present at their highest concentration in the 35' bgs soil <br /> sample. <br /> Boring CPT-5 was advanced in the area of the former diesel UST to address <br /> some concerns noted by EHD. No soil samples were collected from this boring <br /> and only two ground water grab samples were collected. TPH as diesel was <br /> detected at 120 ug/1 from the 85' bgs sample and 180 ug/1 from the 110' bgs <br /> sample. <br /> A Site Conceptual Model (SCM) was included in the report that used data <br /> collected from this and previous investigations to provide an overall geological <br /> interpretation of the subsurface site conditions. Review of the SCM without <br /> tables is difficult and increases the review time because the data must be verified <br /> in previous reports. Please include all soil and ground water data in tables in <br /> future updates to the SCM. <br /> - 4 <br />