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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> Department Environmental Health De„ <br /> N ASSISTANT DIRECTOR <br /> 2' ;2 Laurie Cotulla,REHS <br /> 600 East Main Street <br /> < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> Mike Huggins, REHS, RDI <br /> 9��•F'O.Rr1 Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209)468-3420 Robert McClellon, REHS <br /> 209 464-0138 Jeff Carruesco, REHS,RDI <br /> Fax: <br /> ( ) Kasey Foley, REHS <br /> DAVID ATWATER MAY 0 7 20D7 <br /> VAN DE POL ENTERPRISES INC <br /> P O BOX 1107 <br /> STOCKTON CA 95201 <br /> RE: Pacific Pride—West Lane SITE CODE : 1288 <br /> 3230 North West Lane RO: 666 <br /> Stockton, CA 95204 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed preliminary <br /> analytical results for groundwater samples collected at the above-referenced site on April <br /> 10, 2007, and submitted by Advanced GeoEnvironmental, Inc. (AGE) by electronic mail <br /> on April 23, 2007. 1,2-Dichloroethane (1,2-DCA) was detected at 2.4 micrograms per <br /> liter (gg/L) and 3.8 gg/L from groundwater samples collected from monitoring wells <br /> MW-4 and MW-5R, respectively. This is the first time 1,2-DCA has been detected in <br /> any groundwater samples collected from these two wells and EHD is concerned since <br /> MW-5R is the deepest well onsite with a screened interval-between sixty and seventy feet <br /> below surface grade, and MW-5R is located approximately 250 feet north of municipal <br /> water well station number 77. Therefore, EHD directs you to resample these two <br /> monitoring wells immediately and analyze the groundwater samples for 1,2-DCA, <br /> reporting the results at a detection limit of 0.5 µg/L. Due to the presence of 1,2-DCA at <br /> concentrations above the California Environmental Protection Agency water quality <br /> goals method detection limit (MDL) of 0.5 µg/L, EHD can not consider this site for <br /> closure until this issue is resolved. <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) is requiring <br /> evaluation of Environmental Screening Levels (ESLs), California Human Health <br /> Screening Levels (CHHSLs),.(San Francisco Bay Regional Water Quality Control Board) <br /> and the potential for vapor intrusion into buildings for closure consideration of sites <br /> having residual contamination left in place. Therefore, you need to evaluate the potential <br /> for vapor intrusion inside the buildings located onsite. Please submit a work plan to EHD <br /> by July 25, 2007, to assess the potential for vapor intrusion into the existing onsite <br /> buildings, or provide a rational, with technical support, for discounting vapor intrusion <br /> into the buildings as a potential hazard for this site. <br /> Total extractable petroleum hydrocarbons as diesel (TEPH-d), .TEPH as motor oil <br /> (TEPH-mo), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl <br /> methyl ether (TAME), tertiary butyl alcohol (TBA), 1,2-dibromoethane (EDB), ethanol, <br />