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PUBLIC HEALTH SERVICES o�Qu,M <br /> off O- <br /> SAN JOAQUIN COUNTY r <br /> x <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M D , M.P H, HeaIth Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 9520 c4`'FOR��P <br /> 209/4683420 C (DFIY <br /> W H COLBERG <br /> COLBERG INC MAY 0 S 1999 <br /> PO BOX 1288 <br /> STOCKTON CA 95201 <br /> RE Colberg Boat Works Inc Site Code 2005 <br /> 848 W Fremont St <br /> Stockton CA 95203 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD) has received <br /> and reviewed"Mass Balance For Remaining TPH-g" report dated April 2, 1999 prepared by Apex <br /> Envirocech,Inc (Ape�c) The report calculated the total mass of Total Petroleum Hydrocarbon as <br /> gasoline (17PH-0 remaining in the soil to be 3 77 pounds and in the groundwater 0 21 pound in the area <br /> of the former underground storage tank(UST) Ina telephone conversation with your consultant on <br /> April 9, 1999, PHS/EHD staff discussed the estimated values and the rationalization of certain <br /> computational steps used in the mass balance calculation PHS/EHD also enquired if the proposed <br /> remedianon using Oxygen Releasing Compound(ORC)is still appropriate given the small quantity of <br /> 0 petroleum contamination calculated in the report Apex personnel stated they will review the mass <br /> balance calculation, or supply rationalization for the necessity of ORC remediation The"Workplan <br /> for Pilot Test and Feasibility Analysis" dated September 28, 1998 is not approved at this time <br /> On April 9, 1999 Central Valley Regional Water Quality Control Board (CVRWQCB) staff indicated <br /> they would not concur with a closure request MW-3 is located east of the former UST Analytical <br /> results of the water samples collected from IMW-3 have historically indicated the presence of TPH-g, <br /> aromatic hydrocarbons as benzene, toluene,ethyl-benzene, and total xylenes(BTEX), and methyl tert- <br /> butyl ether (MTBE) There is no soil or groundwater investigation eastward beyond MW-3 The extent <br /> of the contamination has not been defined east of the former UST Submit a work plan that will define <br /> the horizontal extent of the contamination at the former gasoline UST to PHS/EHD by June 30, 1999 <br /> If you have any questions,please feel free to contact Jeffrey Wong at(209)468-0335 <br /> Donna Heran,RF-HS,Director <br /> Environmental Health Division <br /> /effrey Wong, REHS Margaret Lagorio,RENS <br /> IAP/Site Mitigation Unit IV Supervisor <br /> RWQCB, Central Valley Region-Mark List <br /> Apex Envirotech,Inc -Thomas E Ballard <br /> A Division of San Joaquin County Heaith Care Sen i-ei, <br />