Laserfiche WebLink
GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street � <br /> Escalon, California 95320 _ i f}��� �� ��� <br /> Telephone (209)838-9888 <br /> Facsimile (209) 838-9883 4 2005 <br /> Lr—oV1IP,)NM0T HERB <br /> PLhMl USEMICES <br /> May 23, 2005 <br /> Ms Vicky McCartney kill <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Additional Subsurface Investigation and Semi-Annual Groundwater <br /> Sampling Report <br /> H&H Engineering and Construction Facility, 212 Industrial Drive, Stockton, CA <br /> Dear Ms McCartney <br /> This letter report summarizes the results of the additional subsurface investigation performed at <br /> �i the subject site, and the first semi-annual 2005 groundwater monitoring and sampling activities <br /> performed at the subject site A site vicinity map is presented as Figure 1 <br /> SITE ACTIVITIES <br /> Activities at the site included drilling and sampling seven soil borings and conducting routine <br /> semi-annual groundwater monitoring and sampling of site wells The additional drilling <br /> activities were conducted to further define the lateral extent <br /> fuof groundwater contamination, <br /> particularly upgradient of the former UST and downgradient of monitoring well MW3 <br /> Additional Drilling and Soil Sampling <br /> On March 1, 2, and 3, 2005, a Ground Zero geologist supervised the drilling and sampling of seven <br /> soil borings at the subject site The borings were advanced by Fisch Environmental (C57-683865) <br /> using a Geoprobe 6600 direct-push drilling rig The borings were 1 I/4 inches in diameter <br /> The locations of the borings are shown on Figure 2 Borings SBA and SBB were advanced to 50 <br /> feet below the ground surface (bgs) in order to further define the downgradient extent of soil and <br /> groundwater contamination Borings SBC, SBD, SBF and SBG were drilled to 50-52 feet bgs to <br /> help further define the upgradient extent of groundwater contamination SBE was drilled near the <br /> �� former dispenser island to a depth of 12 feet bgs Boring SBG was drilled north of its originally <br /> r <br /> proposed location The back of the old office building was inaccessible to the drilling rig due to a <br /> G 1GROUNDZEIW-E\SAR12005NI SAR05banngreport doc <br />