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ENVIRONMENTAL HEALTH 10EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Program Coordinators <br /> v Donna K. Horan, R.E.H.S. 304 East Weber Avenue,Third Floor Carl Borgman, R.E.H.S. <br /> Director <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S , R.D.I. <br /> • cq a`P., <br /> Margaret LagoriAssistant Directo,- Telephone: 209 468-3420 <br /> �,a8a p ( ) Robert McClello, R.E.H.S. <br /> lellon, R.E.H.S. <br /> Fax: (209) 464-0138 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> ANDY ZARAKANI OCT 2 5 2006 tf.a' <br /> PO BOX 1036 <br /> TRACY CA 95736 <br /> RE: Three B's Truck Plaza SITE CODE: 507155 <br /> 14749 N. Thornton Rd. RO#: 550 <br /> Lodi, CA., 95242 CUF#: 12992 <br /> The San Joaquin County Environmental Health Department (SJCEHD) has received <br /> and reviewed Site Conceptual Model (SCM), dated 10 March 2006, as submitted by <br /> your consultant, Advanced GeoEnviron mental Inc (AGE). In addition, the EHD and AGE <br /> has discussed the status of your site and potential remedial approaches for mitigation of <br /> the impact of your unauthorized release on soil and groundwater on your site. <br /> The SCM shows the subsurface of your site divided into six hydrogeological units as <br /> defined by the soil composition and each soil types inferred hydrogeological properties. <br /> It was concluded in the SCM that: <br /> • The preponderant contaminants of concern (CDCs) are total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g), TPH as diesel (TPH-d) and <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX); <br /> • Methyl tert-butyl ether (MTBE), tert-butyl alcohol (TBA), tertiary amyl methyl ether <br /> (TAME) and 1,2-dichloroethane (1,2-DCA) are locally present, the 1,2-DCA and <br /> MTBE posing the greater concern of the four; <br /> • The lateral and vertical extent of impacted soil had been delineated on the site <br /> except for the vertical extent of impacted soil in the immediate area of the former <br /> underground storage tank (UST) pit; the dispensers, and west-northwest of <br /> MW-3; <br /> • The vertical and lateral extent of impacted groundwater had been delineated in <br /> all directions, and except in the immediate former UST pit area, most impacted <br /> groundwater is limited to the first hydrogeological unit; <br /> • In the immediate area of the former USTs, impacted groundwater extends as <br /> deep as the third hydrogeological unit; <br /> • No additional groundwater monitoring wells are needed; <br /> • The site is adequately assessed and a corrective action plan (CAP) should be <br /> prepared; and <br /> • A soil vapor extraction (SVE) pilot study is warranted at this time. <br />