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ENVIRG�'1vMENTAL HEALT11 DEPARTMENT <br /> �Q�IM SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> w :< Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> �,:• Al Olsen, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> cq:. ,a_,aCP Progrant Manager Telephone: (209)468-3420 Douglas W. Wilson, R.E.H.S. <br /> �t F R Laurie A. Cotulla, R.E.H.S. Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> P'L,4 Website:www.sigov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> '61drSTRONG <br /> RUTH STRON ERTY D � �Id ,AUG 0 3 2005 <br /> 330 LLYWOOD <br /> ,TVXCY CA 95376 �f Dcht- ' V20V <br /> RE: RUTH STRONG PROPERTY <br /> 5157 W BUSINESS LOOP 205 <br /> TRACY CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Problem <br /> Assessment—Feasibility Slut v Report(PAR) dated April 29, 2005 and 1st Quarter Report 2005 <br /> (QMR) dated May 9, 2005 prepared by Advanced GeoEnvironmental, Inc. (AGE). The <br /> PAR included a review of the domestic and municipal well receptor survey, a site conceptual <br /> model (SCM) which described the extent of the impact to soil and groundwater vertically <br /> and laterally, a section on the potential impact on nearby surface and ground water sources, <br /> and a comparison of 3 soil remediation alternatives and 3 ground water remediation <br /> alternatives: <br /> • Three domestic drinking water wells are located in the nearby area: DW-5157 is <br /> located on site about 230 feet west of the former underground storage tanks (UST). <br /> DW-5225 is located off site about 250 feet north of the site, and DW5055 is located <br /> about 200 feet northeast (down gradient direction) of the site. Although DW5055 <br /> has been regularly sampled,AGE was unable to obtain permission to sample the well <br /> from the owner of DW5055. <br /> • AGE concluded the contamination in the soil to be defined both laterally and <br /> vertically. AGE calculated approximately 229 gallons of petroleum hydrocarbons <br /> remained in the soil. <br /> • AGE concluded the groundwater plume to be defined both laterally and vertically. <br /> The PAR did not include a calculation of the contamination mass in groundwater. <br /> The QMR reported continual reduction of the concentrations of Total Petroleum <br /> Hydrocarbons as gasoline (ITH-g) and aromatic hydrocarbons in groundwater. <br /> TPH as diesel (TPH-d) increased in monitoring well MW-2 and 11NIW-6 compared to <br /> the previous quarter. Currently only 3 out of 12 monitoring wells (MW-2, MW--5, <br /> and MW-6) have detectable contaminant concentrations,with 78 micrograms per <br /> hter (ug/1) being the highest TPH-g concentration, 1.4 ug/l for benzene, and 1,000 <br /> for TPH-d. <br /> • AGE calculated the groundwater flow direction at 10 feet below surface grade (bsg) <br /> to be north-northwest to south-southwest, and the flow direction at 20 feet to be <br /> east-northeast and west-southwest. The dissolved plume has migrated off site in a <br /> northwest direction and may be following a discontinuous sand body at the top <br /> water table approximately 10 to 13 feet bsg. <br />