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y <br /> Beacon Station No 641 July 14 2000 <br /> Stockton California uarterly Groundwater Momtorin�-) Report <br /> vvell ivfW-3 at concentrations ranging from 7 8 to 750 ppb A TAME concentration of 3 9 <br /> ppb vvas detected in the groundwater sample from vapor extraction %kell VW--) <br /> Recommendations <br /> The recently installed monitoring wells MW-6 MW-7 and MW-8 have been incorporated <br /> Into the quarterly monitoring schedule Horizon recommends quarterly monitoring and <br /> evaluation of groundwater quality trends continue concurrently vv ith development of a <br /> Problem Assessment Report and Corrective Action Plan as recommended in the Horizon <br /> document Results of Additional Subsurface Investigation dated June 15 2000 <br /> Distribution <br /> A copy of this report should be forwarded to <br /> Mr Michael Infurna Jr R E H S Mr Gordon Boggs <br /> San Joaquin County Public Health Services Regional Water Quality Control Board <br /> Environmental Health Division Central Valley Region <br /> 304 East Weber Avenue Third Floor 3443 Routier Road <br /> P O Box 388 Sacramento, California 95827-3098 <br /> Stockton California 95201-0388 <br /> If you have any questions, please contact Horizon at (916) 939-2170 <br /> Sincerely, <br /> H IZON ENVIRON NTAL INC. <br /> Gary Barker 9-Q G Fo <br /> Senior Project Manager �o <br /> U, REXFORD K SMITH ., <br /> • NO cJ r; 7 <br /> Rexford K Smith s� <br /> Registered Geologist No <br /> of Cp,'Jto <br /> Attachments Figure 1 Site Vicinity Map <br /> Figure 2 Site Map/ Groundwater Contour Map <br /> Figure 3 Benzene Isoconcentration Map <br /> Table 1 Groundvvater Monitoring Data <br /> Attachment A Ultramar Field Procedures <br /> Attachment B Doulos Sampling Information Sheets <br /> Attachment C Analytical Data Reports and Chain-of-Custody Documents <br /> 64[gnirOOQ2 do,- <br /> 1641 43 3 HORIZON ENVIRONMENTAL INC <br />