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MARK THOMAS & CO. INC. PRINCIPALS. <br /> ji�/� SAM J.ZLILLO <br /> %%// CONSULTING CIVIL ENGINEERS& MUNICIPAL PLANNERS RICHARD <br /> a snv o <br /> 7300 FOLSOM BOULEVARD,SUITE 203,SACRAMENTO,CA 95826 TIMOTHY R.FLEMING <br /> PHONE(916)381-9100 • FAX(916)381-9180 • email:<name>@mtcosac.com DAVID E.ROSS <br /> Visit us at www.markthomas.com MICHAEL J.LOHMAN <br /> November 29, 1999 File No.: H 98125A(12) <br /> State of California <br /> Department of Transportation <br /> 1976 E.Charter Way �� <br /> Stockton,CA 95201 p <br /> Atm: Mr. Pat McAchren JAN 18 2000 <br /> Re: 10-SJ-99 K.P.29.77/36.89: Route 99/Hammer Lane Interchange ENVIRONMENTAL HEALTH <br /> Supplemental Preliminary Site Investigation PERMIT/SERVICES <br /> Dear Mr. McAchren <br /> As previously discussed,enclosed are five copies Supplemental Preliminary Site Investigation (PSI)for the Hammer/99 <br /> interchange.As requested,Espana investigated with deeper exploration on the former Texaco and Mobil sites,drilling at the <br /> locations of the previous underground storage tanks.The investigative approach was reviewed and approved by Saiyed Ali, <br /> District Hazardous Waste Coordinator. Following is brief summary of the preliminary findings: <br /> ❑ At the Texaco site,soils contaminated with petroleum hydrocarbons were encountered in the former tank area. � <br /> Additionally, low levels of unidentified diesel hydrocarbons were detected in the groundwater at chis location. <br /> ❑ At the Mobil site,no detectable hydrocarbons were encountered in the soils tested within the former tank pit area. <br /> However, low levels of unidentified diesel hydrocarbons also were detected in the groundwater at this location. <br /> Assuming Alternative 5 is ultimately chosen as the preferred alternative,no soil remediation appears necessary.The <br /> groundwater contamination will need to be coordinated with the Regional Water Quality Control Board. The board may <br /> require some level of mitigation and/or monitoring.The scope of this activity,and timing with respect to the environmental <br /> document,will need to be coordinated. <br /> If you need additional information or have any questions,please call me. <br /> Sincerely, <br /> MARK THOMAS&CO. INC. <br /> i <br /> Timothy R. Fleming I <br /> TRF:do 7 <br /> Enclosures: 5 copies of Hammer/99 supplemental PSI <br /> Copy w/enc: Mr. Steve VanDenburgh,SJCOG <br /> Mr.Paul Takhar, San Joaquin County <br /> Ms. Laurie Warner,JSA <br /> Mr.Jim Finnegan, Universal Field Services I <br /> Copy w/o enc. Mr. Paul Elliott,Caltrans District 10 {f <br /> Mr. Pat Fisher, Espana Geotechnical <br /> i <br /> TRANSPORTATION FACILITIES HIGHWAYS AND BRIDGES MUNICIPAL ENGINEERS ASSESSMENT DISTRICTS HYDROLOGY AND DRAINAGE <br />