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i <br /> AE VI NMENTAL HEALTH DEPARTMENT <br /> ,o.P UrN c <br /> SAN COUNTY <br /> �G Unit Supervisors <br /> zr �� Donna K.Heran,R.E.H.S. <br /> �' 304 East Weber Avenue Third Floor Carl Bor-man;R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> • Al Olsen,R.E.H.S. Stockton., California .95202-2708 <br /> Douglas W.Nilson,R.E.H.S. <br /> Program Ntanage'' Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S.�rFOR Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-01.38 Robert McClellon,R.E.H.S.Program Manager Mark Barcellos,R.E.H.S. <br /> f AR I OU <br /> JOHN & MARGARET MARCI. <br /> 6816 STABILUS ROAD <br /> VALLEY SPRINGS CA 95252 <br /> RE: John and Margaret Marci Property SITE CODE: 2015 <br /> 2969 Loomis Road <br /> Stockton, California 95205 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Additional <br /> Site Characterization Work Plan dated March 3, 2005; prepared and submitted on your <br /> behalf by Geological Technics Inc. (GTI). To reduce the lithologic profile data gap, GTI <br /> proposes to advance eight cone penetrometer testing (CPT) borings to a maximum depth of <br /> 90 feet below the ground surface (bgs). A minimum of one, and up to four soil samples <br /> will be collected per borehole to assess the lateral and vertical extent of soil contamination; <br /> and a maximum of three groundwater samples "NN-111 be collected per borehole to define the <br /> lateral and vertical extent of the groundwater plume. A map is presented showing the <br /> proposed CPT borehole Locations; however, no justification is given for these locations. <br /> EHD recommends the following to better ensure lithologic assessment, as well as vertical <br /> and lateral assessment of the extent of impacted soil and groundwater: <br /> • Advancement of the proposed CPT-1 soil 'boring located near the former <br /> underground storage tanks to a depth of approximately 120 feet bgs to characterize <br /> the hydrogeology and lithology, and model potential contaminant migration <br /> pathways. Analytical data from the installation of monitoring well MW-105 in. <br /> August 2000, and current quarterly groundwater monitoring data for MW-105 <br /> demonstrate that soil and groundwater are impacted at 95 feet bgs. EHD believes <br /> the advancement .of CPT borings.to the proposed depth of only.90 feet bsg would <br /> not provide additional information to complete the vertical assessment of impacted <br /> media. <br /> • Advancement of the remaining seven proposed CPT borings to an appropriate depth <br /> based on the lithology and field indications of contamination found during the <br /> initial advancement of the first borehole. <br /> I <br /> C <br /> i <br />