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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY -visors <br /> 's Mmia K.Reran,R.E.H.S. Carl Ilorgman, RIA.S. <br /> 304 East Weber Avcnue, Third 171001- <br /> Director Mike[III' oins, R.E.1-I.S.,RDT <br /> Muglas W.Wilson.R.E.H.S. <br /> M Olsen,RJ'..11-S. Stockton, California 95202-2708 <br /> Telephone: (209) 468-3420 Margaret 1_agorio.RILH.S. <br /> Prooram manzIger <br /> Laic ,A Robert McClcllon,RIJI.S. <br /> ntil Fax: (209) 464-0138 <br /> Program Afalloger Mark Barcellos,R.E.H.S. <br /> ROSE CAL LLC JAN 3 1, 20U <br /> CIO KENNETH ANDERSON <br /> P 0 BOX 683 <br /> RIPON CA 95366 <br /> RE: FORMER NELSON READY MIX SITE CODE: 1199 <br /> 2059 NAVY DRIVE <br /> STOCKTON <br /> San Joaquin County Environmental Health Department (EHD) is the lead agency <br /> providing the oversight of the investigation and cleanup of releases from <br /> underground storage tanks (UST) within San Joaquin County. EHD has a <br /> contract with California State Water Resources Control Board (SWRCB) to <br /> conduct a UST corrective action program. <br /> On 21 February 1995 a 4000 gallon UST that had contained diesel was removed <br /> at this site under EHD permit and inspection. Two soil samples were collected <br /> beneath the UST at 13 feet below ground surface (bgs) and one soil sample was <br /> collected at four feet bgs from beneath the dispenser. Groundwater did not enter <br /> the excavation during removal or sampling activities. Analytical results of all <br /> three of the soil samples collected during removal of the UST system evidenced <br /> total petroleum hydrocarbons as diesel (TPH-d) contamination. The soil sample <br /> having the greatest concentration of contamination was from below the . <br /> dispenser, which was located five feet northeast of the UST. The excavation was <br /> backfilled to grade sometime after the UST removal. The site was placed in the <br /> Local Oversight Program on 7 August 1995. <br /> On 20 February 2004, excavation of the former UST system area was performed <br /> and samples from the sidewalls of the excavation at approximately 6.5 bgs were <br /> collected. Groundwater entered the excavation and a grab water sample was <br /> collected. EHD staff and Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) staff reviewed the "Report on Former Diesel Tank Removal and Pit <br /> Water Sampling" prepared by H20GEOL dated 08 March 2004. The Report <br /> contains results from the 20 February 2004 soil and water samples and a request <br /> for site closure with no further action (NFAR). <br /> EHD and CVRWQCB staffs do not concur with the recommendation to grant the <br /> site a NFAR. The analytical results of the water and soil samples collected <br /> during the UST system removal and the 20 February 2004 excavation, evidenced <br />