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r <br /> 1260 Graphics Drive <br /> Modesto California <br /> ' J 95351 <br /> a I1 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T E S I N C <br /> I <br /> xr <br /> December 22, 1997 <br /> Ms Mary Meays <br /> San Joaquin County <br /> Public Health Services, EHD <br /> 304 E Weber St , Third Floor <br /> Stockton, CA 95202 <br /> Subject Soil Sampling Report, Utility Test Trenches in Vicinity of 26080 Thornton Road, <br /> Thornton, CA, Site Code 1864 <br /> Ms Meays <br /> This letter has been prepared by ATC Associates Inc (formerly Smith Technology,-) to summarize <br /> field activities and analytical results of work associated with collecting soil samples along <br /> underground utility trenches in the vicinity of the subject site (Figure 1) This work was <br /> performed and the request of San Joaquin County Public Works Department (SJCPWD) and San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> While performing work on an underground storm drain line running parallel to Thornton Avenue, <br /> a SJCPWD field crew discovered apparent petroleum impacted soil near the intersection of <br /> Thornton Avenue and Walnut Grove Road, approximately 950 feet from 2080 Thornton Avenue <br /> (the subject site) Due to concerns that gasoline petroleum hydrocarbons may have migrated from <br /> the subject site's former underground storage tanks (USTs) along the util.ty %i ench (a potential <br /> preferential pathway for contaminants) ATC was contra ted to collect aria analyze soil samples <br /> from test trenches excavated along the storm drain line <br /> FIELD ACTIVITIES AND FINDINGS <br /> On November 5, 1997, ATC personnel arrived on-site and met with representatives from the two <br /> San Joaquin County agencies In order to evaluate subsurface conditions and collect soil samples <br /> along the storm drain, a SJCPWD equipment operator, using a backhoe tractor, excavated two <br /> test trenches along the storm drain paralleling Thornton Avenue <br /> The initial test trench (Trench 1) was located at the intersection of Thornton Avenue and Walnut <br /> Grove Road, at or near the location of the initial discovery of the apparent contamination and is <br /> located approximately 950 feet northwest of 26080 Thornton Avenue This initial trench was <br /> w 194326tirepor1slsjo1_sam doe 1 <br />