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Former Beacon Station No 419 Apnl 20,2000 <br /> Stockton California Groundwater Monitoring Repo <br /> . The lead scavenger compound EDC was detected in groundwater from all sampled wells at <br /> concentrations ranging from 1 1 to 190 ppb The lead scavenger compound EDB was <br /> detected in groundwater from monitoring wells MW-3, MW-6 and from air-sparge well AS- <br /> 1 at concentrations of 6 4, 16 and 250 ppb, respectively The EDC and EDB concentrations <br /> in groundwater samples from the monitoring wells generally represent slight increases or <br /> decreases compared to December 1999 <br /> Recommendations <br /> Horizon recommends continued quarterly monitoring be performed at this site to evaluate <br /> trends in groundwater levels and concentrations of dissolved hydrocarbons over time On <br /> the basis of data collected during the Additional Subsurface Investigation (Horizon, <br /> February 17, 1999), Horizon has recommended the installation of an additional groundwater <br /> monitoring well (MW-11) in the northern corner of the site to evaluate the northern extent of <br /> the relatively high TPHg and BTEX concentrations detected in the HydroPunch® water <br /> sample collected from the interval 88-91 5 feet bsg in boring SB-6 (converted to air <br /> sparge/vapor well AS-1/VW-INW-2), and feasibility testing to evaluate the most effective <br /> method(s) of soil and groundwater remediation at the site <br /> Report Distribution <br />• We recommend a copy of this report be forwarded to <br /> Mr Michael J Inform, R E H S Mr Gordon Boggs <br /> Environmental Health Division CRWQCB - Central Valley Region <br /> San Joaquin County Public Health Services 3443 Routier Road, Suite A <br /> P O Box 2009 Sacramento, California 95827-3098 <br /> Stockton, California 95201 <br /> If you have any questions, please contact Horizon at (916) 939-2170 <br /> Sincerely, <br /> HORIZON ENVIRONMENTAL INC. <br /> Gary D B ker Vii, GF <br /> Senior Project Manager `�.,�t'� 0 <br /> N <br /> 4C AEXFORD K $1111T►1 .4 <br /> Na 53QT <br /> Rexford Smith �9 f iFP <br />• Registered Geologist No 5307 OF CA��� <br /> A 114191431419QMR00 Q1 doc <br /> Job No 1419 43 3 HORIZON ENVIRONMENTAL INC. <br />