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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> X Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> : Carl Borgman,REHS <br /> Mike Huggins, REHS, RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> q�1o:g�i <br /> Phone: (209)46$-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 .teff Carruesco, REHS, RDI <br /> Kasey Foley,REHS <br /> GREG CARNEY DEC 0 6 2007 <br /> STOCKTON TERMINAL & EASTERN RR <br /> 1330 N BROADWAY <br /> STOCKTON CA 95205 <br /> RE: Stockton Terminal & Eastern Railroad SITE CODE: 1726 <br /> 1282 Shaw Road <br /> Stockton CA 95215 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Work Plan <br /> for Soil and Limited Groundwater Site Assessment(Work Plan) dated November 17, 2007, <br /> submitted on your behalf by Stephen G. Muir (Consultant) and has the following comments. <br /> In the Work Plan your Consultant proposes the installation of three soil borings and the <br /> collection of soil and grab groundwater samples for laboratory analysis. Two borings are <br /> proposed to be located outside of the former underground storage tank (UST) pit location <br /> and will extend to groundwater; one boring will be located in the former UST pit area near <br /> boring B-1 for collection of confirmation soil samples. In the event that obvious petroleum <br /> hydrocarbon contamination is noted in the borings located outside of the former UST area, <br /> these borings will be extended in depth and completed as 2-inch diameter groundwater <br /> monitoring wells. The Consultant also proposes to update the Sensitive Receptor Survey. <br /> Following completion of the fieldwork the Consultant will prepare an updated Site Conceptual <br /> Model and a Problem Assessment Report. <br /> The Consultant proposes to conduct a Geophysical clearance survey to look for any possible <br /> underground structures, and has also proposed to have Underground Service Alert of <br /> Northern California map the site for underground structures. Prior to approving the proposed <br /> Geophysical clearance survey, the Consultant must to provide the justification in writing to <br /> SJCIEHD showing the basis for concern that underground structures exist in the area <br /> previously investigated with soil borings. <br /> SJCIEHD approves the proposed scope of work with the following conditions/changes: <br /> 1. One additional boring to groundwater is to be installed northeast of the former <br /> UST pit, near boring B5, to better surround the source area. <br /> 2. The three borings surrounding the former UST pit area should all be drilled before <br /> the boring location proposed in the former UST pit area, near boring 131, is drilled. <br /> 3. If the groundwater samples collected from the three borings located outside of the <br /> former UST pit area have obvious signs of petroleum hydrocarbon contamination, <br /> these borings may be converted to groundwater monitoring wells. <br />