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` San Joaquin County DIRECTOR <br /> i PQu!N Donna Heran, REHS <br /> Environmental Health Department p ASSISTANT DIRECTOR <br /> �2 s fi4 G� Laurie Cotulla,RENS <br /> 600 East Main Street <br /> Stockton; California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Mike Huggins, REHS,RDI <br /> Qtffios�� Margaret, orio, REHS <br /> Website: vvww.sjgov.orglehd s g <br /> Phone: (209)468-3426. Robert McClellon, RENS <br /> 209 464-0138 <br /> Jeff Carruesco,REHS,RDI <br /> Fax: <br /> ( ) Kasey Foley, REHS <br /> A. Teichert and Sons, Inc. MAY 2 4 2007 <br /> Attn:, George Takamori <br /> P. O. Box 15002 <br /> Sacramento, CA 95851 <br /> RE:- 103 N. E.Streett <br /> Site Code: 1555 <br /> Stockton, CA <br /> E <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 for your site dated January 25, 2007 prepared by Stratus Environmental, Inc. <br /> This''latest phase of work was performed to further determine the extent of the1,2 <br /> dichoroethane (1,2-DCA) impact in ground water.caused by the unauthorized release <br /> from the former USTs. <br /> EHD has the following comments: <br /> .1. Four twin CPT borings (CPT10, CPT11, CPT12, CPT13) were <br /> _ completed on September 9, 2006. Ground water analytical results <br /> from the grab samples suggest the vertical and lateral limits of the <br /> plume remain undefined. In CPT10, CPT. 12 and CPT13, 1,2-DCA <br /> was reported in the shallower water bearing zones and in CPT11 1,2- <br /> DCA was reported in the deeper water bearing zone sampled at 109 <br />{ feet below ground surface (bgs). The reported 1,2-DCA <br /> concentrations were above a Maximum Contaminant Level (MCLs) for <br /> drinking water. <br /> 2. In the report, The Site Conceptual Model evaluates human exposure <br /> pathways: subsurface soil, volatilization, and ground water. The <br /> model developed by.Stratus has not identified any direct expose <br /> pathways: The model indicates that there are not any complete <br /> pathways for exposure to the contaminants remaining in the <br /> subsurface, but further evaluation of residual soil and groundwater <br /> concentrations needs to be addressed. <br /> i <br />