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rr <br /> w <br /> Former Beacon Station No 419 June 20 2000 <br /> Stockton California Groundwater MonitoringReport <br /> well MW-8 Concentrations ranging from 6 8 to 12 ppb TBA were reported in groundwater <br /> samples from monitoring wells MW-5, MW-7 and MW-9 <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 the <br /> basis of data collected during the Additional Subsurface Invests ation (Horizon, February 17, <br /> 1999), Horizon has recommended the installation of an additional groundwater monitoring <br /> well (MW-11) in the northern corner of the site to evaluate the northern extent of the <br /> relatively high TPHg and BTEX concentrations detected in the HydroPunce water sample <br /> collected from the interval 88-91 5 feet bsg in boring SB-6 (converted to air sparge/vapor <br /> well AS-1/VW-1/VW-2), and feasibility testing to evaluate the most effective method(s) of <br /> soil and groundwater remediation at the site An Addendum to Work Plan for Additional <br /> Subsurface Investigation describing the recommended work is in preparation <br /> Repos t Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael J Infurna, 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 /> HO ON ENVIRONMENTAL INC. <br /> Gary D B er <br /> Semor Project Manager ��FD GEO`0 <br /> v� <br /> � <br /> RE ORD K S1+11TN � <br /> AC <br /> • <br /> No 5307 <br /> Rexford Smith <br /> �� <br /> Registered Geologist No 53 lF <br /> Of C A� <br /> 419gmr00Q2 doc <br /> 141943 3 HORIZON ENVIRONMENTAL INC. <br />