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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> �•' —++�—� .OG Donna Heran,RENS <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> c .. PKasey Foley,REHS <br /> ......• a� Website: www.sjgov.org/ehd <br /> Linda Turkatte, REHS <br /> F—0i <br /> Phone: (209) 468-3420 Rodney Estrada,REHS <br /> Fax: (209) 464-0138 Adrienne Ellsaesser, REHS <br /> April 2, 2014 <br /> CEMEX Lone Star Aggregates PTP <br /> Mr. Bruce H. Eppler, PG 1501 Belvedere Road <br /> 5180 Golden Foothill Parkway, Suite 200 West Palm Beach, Florida 33406 <br /> EI Dorado Hills, California 95762-9608 <br /> Subject: CEMEX Tracy Facility (Former RMC Lone Star Kerlinger Aggregate Plant) <br /> 30350 South Tracy Blvd. <br /> Tracy, California 95376 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed historical and <br /> recent soil and groundwater analytical data and recent reports, including Results of <br /> Groundwater Monitoring and Additional Field Investigation to Address Data Gaps (data gap <br /> report), dated 27 March 2013, and Third Quarter 2013 Groundwater Monitoring Report <br /> (November 2013 groundwater monitoring report), dated 1 November 2013; the two reports were <br /> submitted by your consulting firm, SOMA Environmental Engineering, Inc. (SOMA) on your <br /> behalf for the above-referenced site. <br /> Based on soil and groundwater analytical results presented in the data gap report, SOMA has <br /> recommended the advancement of additional soil borings near soil borings CB-5-So, BH-3 and <br /> BH-4 to delineate the total petroleum hydrocarbons (TPH) as diesel (TPH-d) contaminant <br /> concentrations prior to soil excavation in the area of monitoring well MW-5; high concentrations <br /> of TPH-d were detected at 15,000 milligrams per kilogram (mg/kg) at 18 feet below surface <br /> grade (bsg) in soil boring CB-2 advanced approximately ten feet north/northwest of MW-5. <br /> Also, TPH-d was detected for the first and only time in groundwater collected from all the <br /> monitoring wells (MW-4 through MW-8) on February 28, 2013. However, in the November 2013 <br /> groundwater monitoring report, SOMA has recommended "No Further Action Status" for this site <br /> based on groundwater results that reported no contaminants of concern in any of the <br /> groundwater samples collected from monitoring wells MW-5 through MW-8 during the most <br /> recent sampling event on 24 September 2013. <br /> Concentrations of TPH as gasoline (TPH-g) and benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX) detected in soil and groundwater do not appear to pose a significant threat to <br /> human health and the environment. Furthermore, since historical soil analytical results <br /> demonstrate that high-concentration TPH-d-impacted soil extends no deeper than <br /> approximately twenty feet bsg and TPH-d is not likely to impact first groundwater at <br /> approximately 120 feet bsg, the EHD believes additional soil borings CH-5-So, BH-3 and north <br /> of BH-3, and next to BH-4, proposed by SOMA, may not be necessary to delineate TPH-d- <br /> impacted soil and does not approve advancing the proposed borings at this time. <br />