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0 <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> ? = f � Linda Turkatte, REHS <br /> r " 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS,RDI <br /> cti ``a P Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> �rFOR Rodney Estrada, REHS <br /> Phone: (209) 468-3420 Adrienne Ellsaesser, REHS <br /> Fax: (209) 464-0138 <br /> January 30, 2015 <br /> Chris Ceausu <br /> White Arrow <br /> 824 S. Vail Ave. <br /> Montebello, CA 90640 <br /> Subject: White Arrow <br /> 2402 S. California Street <br /> Stockton, CA 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Additional <br /> Subsurface Investigation Report (Report), dated 29 December 2014, prepared and submitted on <br /> your behalf by Partner Engineering and Science, Inc. (Partner). The scope of work for the <br /> investigation was proposed in Additional Assessment Workplan (AAWP), dated 08 October 2014, <br /> and Additional Assessment Workplan Addendum (AAWPA), dated 05 November 2014, and was <br /> approved by the EHD by letter dated 06 November 2014. The purpose of the investigation was to <br /> reduce the uncertainties associated with known contaminants by further characterization of diesel <br /> range hydrocarbons (DRO) and as motor oil range hydrocarbons (MORO), and to assess for the <br /> possible presence of the volatile organic compounds benzene, toluene, ethylbenzene and xylenes <br /> (BTEX), the CAM 17 metals, and polychlorinated biphenyls (PCBs) in shallow soil to assess the <br /> human health risk assessment posed by the contaminants and evaluate the need for further <br /> corrective action. <br /> On 02 December 2014, six soil borings were advanced to a depth of 25 feet below surface grade <br /> (bsg) to collect soil samples for laboratory analysis for the chemicals of concern encountered in <br /> subsurface soil in an area of identified former potential sources of petroleum hydrocarbons; the <br /> potential sources and their former locations were identified in the course of a Phase I site <br /> assessment. The presence of petroleum hydrocarbons in subsurface soil had been confirmed by an <br /> initial subsurface investigation conducted in 24 April 2014 and reported in Phase I/ Subsurface <br /> Investigation Report. <br /> None of the soil samples from the six borings (one sample per boring) contained detectable <br /> concentrations of volatile organic compounds or concentrations of the seventeen priority metals <br /> (CAM17) in excess of the background range of concentrations for California soils. PCBs were not <br /> detected in the two soil samples analyzed. Gasoline range hydrocarbons were not detected in any <br /> of the 30 soil samples analyzed, and none of the soil samples collected at 20 feet below surface <br /> grade (bsg) or 25 feet bsg contained detectable concentrations of DRO or MORO. Locally, soil at 5 <br /> feet bsg and 10 feet bsg (and one sample from 15 feet bsg) was found to be impacted by DRO <br /> and/or MORO. <br /> The DRO is reasonably well delineated on the site, extending with increasing concentration and <br /> perhaps depth of occurrence toward the southwest from boring B-1 OA, potentially extending off-site <br /> toward the southwest, suggesting the source to have been the oil house or above ground tank <br /> formerly located on the adjacent property. The plume of DRO is not delineated to undetectable <br />