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Jr <br /> American Forest Product <br /> 2801 West Lane, Stockton <br /> Page 2 <br /> samples from 80 feet bsg. This condition was not met during the May 2002 investigation; <br /> CPT technology was not used and the deepest samples collected were from 60 feet bsg. In <br /> order to bring the site toward closure,it is necessary to define the extent of the 1,2-DCA <br /> contamination, and obtain enough hydrogeological data to generate a site conceptual model <br /> and a fate and transport model for the contalmmants in question. The site conceptual model <br /> is needed to put the sample data in proper context. Submit a work plan that will define the <br /> lateral and vertical extent of the contamination and site conceptual model to EHD by May <br /> 30, 2003. <br /> PCE is a chemical with potential Dense Non-Aqueous Phase Liquid (DNAPL) behavior due <br /> to its density (1.6230 at 20 degrees C) and low solubility (approximately 10,000 parts water, <br /> versus 120 parts for 1,2-DCA, and 0.048 parts for MTBE according to Merck Index). The <br /> DHS has established the MCL for PCE at 5,µg/l. It is not known if the dissolved PCE <br /> originated from the former waste oil tank, or if it was a separate release at the site not <br /> . :EHDze nests PCE be included in the analyses <br /> associated with underground storage tanks q y <br /> in all future quarterly sampling and for the additional site investigation. <br /> The last quarterly report received by EHD was Fourth Quarter 2001 Qydrterly Monitoring Deport <br /> dated January 30, 2002. You are required to;sample the monitoring wells on a quarterly basis <br /> according to California Code of Regulation Title 23 Division 3, Chapter 16,Section 2653 (d). <br /> EHD directs that you reinitiate quarterly saTpling by second quarter of 2003 (April through <br /> June). <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> / T <br /> Jeffrey Wong, Senior REHS Nuel C. Henderson,Jr.,RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: URS Corporation—Anthony Minling,RG <br /> c: American Molding and Millwork—Don Strong _ <br /> c: RWQCB,.Central Valley Region—James Barton,RG <br />