Laserfiche WebLink
' I . <br /> GROUND ZERO ANALYSIS, INC. <br /> D <br /> 1714 Main Street I <br /> Escalon, California 95320 <br /> Telephone: (209)838-9888 JAN 2 6 2004 <br /> Facsimile: (209)838-9883 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> January 22,2004 <br /> Ep <br /> Ms. Vicki McCartney # <br /> San Joaquin County Public Health Services I <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Workplan for Additional Subsurface Investigation <br /> Souza 11 LLC, 612 West Eleventh Street, Tracy,CA <br /> Dear Ms. McCartney: <br /> This letter report is submitted to present a proposed workplan to conduct additional subsurface investigation <br /> at the subject site(Figure 1). The investigation was requested by San Joaquin County Environmental Health <br /> Department(EHD) in correspondence dated October 10,2003. <br /> The general scope of work will consist of drilling and sampling two soil borings to investigate the vertical <br /> and lateral extent of residual soil contamination, collecting a discrete groundwater sample from each boring <br /> to investigate the vertical and lateral extent of groundwater contamination, analyzing soil and groundwater <br /> samples for the presence of gasoline constituents including oxygenated additives and lead scavengers, and <br /> preparing a technical report that summarizes the methods and results of the investigation. <br /> SCOPE OF WORK <br /> �E <br /> Ground Zero will supervise the drilling and sampling of two soil borings at the site. The estimated boring <br /> locations are shown on Figure 2. <br /> One boring will be advanced to a depth of approximately 25 to 30 feet below surface grade (bsg), <br /> terminating at or near the clay layer beneath the former Tank 4 location to delineate the vertical extent of <br /> soil and groundwater contamination. Soil samples will be collected continuously during drilling and a grab <br /> groundwater sample with be collected at total depth. <br /> ,3 <br /> A second boring will be advanced to a depth of up to 25 feet bsg in the traffic divider in the center of <br /> Eleventh Street in order to collect a grab groundwater sample down gradient of the existing monitoring <br /> F <br /> wells. <br /> 'k <br /> A drilling company licensed in the State of California will advance the borings using a limited access <br /> drilling rig equipped with Geoprobe 5400 direct push apparatus. Soil samples will be collected for logging <br /> and identification purposes continuously. Samples will be collected using a 1 1/2-inch diameter core sampler <br /> lined with clear acetate sleeves. The portion of the sample to be analyzed will be immediately capped and <br /> preserved in an iced cooler at a temperature of approximately 4°Centigrade. Any cuttings produced will be <br /> G:IGROUNDZE15ouzalW orkplanslsouzawp0104.doc <br /> w <br /> ip <br />