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1 <br /> V RI B I • ssociates Geological and Environmental Consulting Services <br /> 1 February 24, 2000 <br /> ' San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue, 3`d Floor <br /> Stockton, CA 95202 <br /> Attention: Ron Rowe <br /> ' Subject: Report of Soil and Groundwater Investigation <br /> ' Clarifier Area, 15700 South McKinley Avenue <br /> Lathrop, California <br /> GA Project No. 110-05-01 <br /> ' Ladies and Gentlemen: <br /> ' Gribi Associates is pleased to present this report on behalf of Scott Company, documenting a soil <br /> boring investigation of the clarifier area at 15700 South McKinley Avenue in Lathrop, California. <br /> This investigation included the drilling and sampling of eight soil borings(I13-1 through I13-8)at the <br /> site using direct-push coring equipment. The goal of this investigation was to assess soil and <br /> groundwater quality adjacent to the clarifier,both for planning purposes for the anticipated removal <br /> of the clarifier and to address regulatory concerns. <br /> With the exception of one detection of 0.00055 parts per million(ppm)of Xylenes in the IB-2 grab <br /> groundwater sample, all soil and grab groundwater samples from this investigation contained no <br /> detectable levels of any hydrocarbon constituents. Thus,it is clear that previously-identified soil and <br /> groundwater impacts in previous borings B-3 and B-9 near the south side of the clarifier are limited <br /> in extent. In addition, results of this and previous investigations clearly indicate that the past <br /> ' operation of the clarifier has not resulted in significant environmental impacts. <br /> ' We appreciate the opportunity to present this report for your review. Please contact us if you have <br /> questions or require additional information. <br /> ' Very trul y ED GFO <br /> Q�GESE. G�O�,� <br /> ' James E. Gribi Stanton Stubbs <br /> Registered Geologist No. 5843 Environmental Scientist <br /> California No. 5843 <br /> JEG/SS:cc FBF CALXF <br /> Enclosure <br /> 1 c Paul Ferreira, Scott Company <br /> ' 1350 Hayes Street,Suite C-14 0 Benicia 0 California 0 94510 0 Phone (707)748-7743 0 Fax(707)748-7763 <br />