Laserfiche WebLink
ICIS <br /> f <br /> VjjBLjC HtALTH SERV <br /> QaurM <br /> ti --yam <br /> SAN JOAQUIN coUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor * Stockton, CA 95242 <br /> 209/468-3420 <br /> KASHMAR SINGH AND DALWINDER DHOOT <br /> RPR Q 3 2000 <br /> 15600 S HARLAN RD <br /> LATHRUP GA 95330 <br /> Re: Does Place Site Code; 231585 <br /> 15600 S.Harlan Rd. <br /> Lathrop CA 95330 <br /> San Joaquin County Public Health Services Environmental Health Division(PHS[EHD)has reviewed the <br /> GroundwaterAssessment Report dated March 20,2000 prepared by Avalon;Environmental Consultants <br /> Groundwater samples collected at the site evidence petroleum contamination and the potential for off site <br /> migration at this site is significant. Further investigative work will be necessary to define the contaminant <br /> plume and evaluate the groundwater. Measures may need to betaken to prevent further cointaminant <br /> migration off site. <br /> MTBE was detected at the highest concentrations in Monitoring Well(MW) i and 2. TPHg and TPHd <br /> concentrations were also evidenced'in the MW1 groundwater sample. MWl is located in the area of <br /> previously removed Underground Storage Tanks(USTs)and close to Harlan Rd. The Well Receptor <br /> Survey dated January 10,2000 prepared by Avalon Environmental Consultants indicates a storm drain, <br /> water line,and sewer line located near MW l along Harlan Rd. The soil boring for MW 1 in the above <br /> Report reflects pea gravel and sand to approximately 15 feet below surface grade(bsg)and silty sand from <br /> 15 feet to 20 feet;bsg. Because of the porous soils and close proximity to contaminated soil and water,the <br /> possibility of contaminants entering and migrating along the municipal conduits should be addressed. Soil <br /> and water sample collection and analysis for contaminants in and near the Harlan Rd.utility lines and any <br /> other potential conduit pathways should occur. The City of Lathrop should be notified by you of the <br /> contamination threat from the above.referenced sitei to utility lines and receptors. <br /> The hydrogeology and groundwater flow conditions in the vicinity of this site should be properly <br /> characterized. Detailed lithological information using borings,continuous core sampling,or cone <br /> penetrometry together with other methods should be used to understand the hydrogeology of this site. <br /> Analysis of soil samples for permeability,porosity,bulk density,moisture and organic carbon content <br /> should be conducted.Evaluate local groundwater flow conditions and establish a site-specific,localized <br /> flownet that is dependent on geologic conditions and reflects the geologic cross sections and fence <br /> d agrams <br /> MTBE plumes can be non-elliptical,long,narrow and erratic(meandering). Itwill necessary to <br /> construct borings,appropriately screened:monitoring wells and/or monitoring we11 clusters in transect or <br /> perpendicular to the MTBE plume to define the extent of the plume.If it is found that the petroleum plume <br /> is migrating off site then it may be necessary to pump and treat contaminants in order to gain hydraulic <br /> control of the plume. <br /> An old pumping station and unidentified potential conduit exists to the south of this site,just north of <br /> Thompson Rd. Provide PHSfEHD with specific information regarding this station;it's use and <br /> construction including subsurface diagrams,and evaluate the potential influence or conduit significance it <br /> may have regarding the contaminant plume at the above referenced site. <br /> A Division of san,Joaquin County Health Care Services: <br />