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STATE OF CALIFORNIA-BUSINESS,TRANSPORTATION AND HOUSING AGENCY Gray Davis,Governor DEPARTMENT OF TRANSPORTATION P.O.BOX 2048(1976 E.CHARTER WAY) '. STOCKTON,CA 95201 "m (209)948-7035 June 13,2001 San Joaquin County Environmental Health 10-SJ-120 PM6.7-7.0 304 E.Weber Ave. EA: 10-OA7500 Stockton CA APN:243-210-71 C/O Margaret Legorio Dear Ms.Legorio: The California Department of Transportation (Caltrans) is proposing to install a traffic signal and widen the intersection at Yosemite Ave (State Route 120) and Austin Rd. in Manteca. APN 243-210-71 (10400 Yosemite Ave.)is located within the proposed right of way acquisition, and according to records provided by your staff,was at one time an operating service station with three underground storage tanks(USTs),that had been removed on April 3, 1986. On February 7 through 9,2001,Michael Robinson of Caltrans along with a contractor conducted a subsurface investigation within Caltrans right of way to assess any hydrocarbon contamination of the soil or groundwater. The report with the results of the investigation is included with this letter. A geophysical survey employing ground penetrating radar and electromagnetic induction techniques identified a magnetic anomaly within the existing Caltrans right of way with general dimensions expected of a UST. Two bore holes were drilled using direct push techniques to groundwater at approximately 27 feet. The first boring encountered hydrocarbons with a TPHd signature (EPA8015) at four feet at a concentration of 960mg/Kg. Organolead (DHS LUFT) was encountered at twenty six feet at a concentration of 14mg/Kg, however the concentration could not be confirmed by GC/MS for the organic fraction,though lead was confirmed(EPA6010) at 29 mg/Kg. The second boring encountered hydrocarbons with TPHmo (EPA8015)at four feet at a concentration of 53.7mg/Kg. The groundwater sample obtained was positive for TPHg at 0.083mg/L,though the laboratory noted that the sample was weathered; and for BTEX at 0.00086 mg/L, 0.00081 mg/L, 0.00099 mg/L, and 0.0018mg/L. All other samples were non-detect for hydrocarbons and BTEX. Although these concentrations do not surpass regulatory standards for soil and water(with the exception of the organolead), the magnetic anomaly was further investigated and determined to be a utility vault,buried beneath the pavement. Caltrans currently has a policy to not acquire property that has significant hazardous waste contamination. As we are looking to acquire a small portion of the property at APN 243-210-71 (10400 Yosemite Ave.), we are concerned about the contradiction between the results of our investigation and the previous work conducted when the USTs were removed. Of especial concern is the anomaly of how may tanks were present originally when the removal was conducted,records seem to indicate three,but only two are indicated in any sketch map. At present Caltrans is planning to conduct a site investigation for hydrocarbons upon APN 243-210-71. The current owner or trustee,Nick Masellis is refusing access to conduct this investigation. Caltrans may have to obtain a court order to conduct the investigation. Before we do so, we would like to consult with your office regarding this investigation and if fiuther investigation is merited. If you have any questions regarding this investigation or the proposed project,please contact Michael Robinson at(209)948-7399. Sincerely, Lisa Randall,Senior Central Sierra Environmental Services Branch