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- �.. <br /> ENVIRON MENTAL HEALTH`)EPARTMENT <br /> Donna K. Heran, R.E.H.S. SAN JOAQUIN COUNTY Unit Supervisors <br /> Director <br /> 304 East Weber.Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S., Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> er <br /> Program Manager Douglas W.Wilson, R.E.H.S. <br /> g g Telephone: (209)468-3420 g <br /> Q�rFMargaret Lagorio,R.E.H.S. <br /> Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.orglehdl <br /> Jeff Carruesco, R.E•H•.S. <br /> A. Teichert and Sons, Inc., ;SUN 2 3 2006 <br /> George Takamori <br /> P O Box 15002 <br /> Sacramento, Ca. 95851 <br /> RE: 103 N. E Street Site Code: 1555 <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 underground . <br /> storage tanks (UST)within San Joaquin County. EHD-has a contract with California <br /> State Water Resources Control Board (SWRCB) to conduct a UST corrective action <br /> program. Your site was placed in the Local Oversight Program in 1989. <br /> EHD has recently reviewed the Site Conceptual Model and Subsurface Investigation <br /> Report <br /> for your site dated April 25; 2006 prepared by Stratus Environmental, Inc.. This latest <br /> phase of work was performed to determine the extent of the 1,2 dichoroethane (1;2-DCA) <br /> impact in ground water caused by the unauthorized release from the former USTs. <br /> EHD has the following comments. <br /> 1. The Site Conceptual Model evaluates human exposure pathways: <br /> subsurface soil, volatilization, and ground water.. There do not appear <br /> to be any complete pathways for exposure to the contaminants <br /> remaining in the subsurface: <br /> 2. Nine twin CPT borings were completed and 1,2-DCA in the ground <br /> water remains undefined. Ground water analytical data suggest the <br /> vertical limit is approximately 97 bgs at CPT-4 although the CPT-4 106 <br /> foot sample was collected from a fine-grained unit, unlikely to be a <br /> significant lateral contaminant migration pathway. The vertical extent <br /> has not been characterized in the area of CPT-8. The lateral limit has <br /> been defined except to the'east of CPT-5 and to the east and <br /> southeast of CPT-8. <br /> S• 3. No MTBE or benzene were.detected in.ground water samples <br /> collected from the 9 CPT borings. <br /> EHD concurs with the recommendation in the,report; additional 1,2- DCA ground water <br /> assessment is warranted in the vicinity of CPT-5 and CPT-8. Please submit a Work <br /> Plan, permit application, and fees by July 15,-2006, to define the extent of ground water <br />