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Mr Jeffrey Wong <br /> January 27, 2006 <br /> Page 2 <br /> Number of Detections Minimum Maximum <br /> Total Samples Constituents above the LRL the 7 Concentration in pg1L(Well ID) Concentration In NgIL(Well ID) <br /> TPHg 0 NO NO <br /> Benzene 0 NO NO <br /> MtBE 7 0 8(MW-7) 100(MW-1) <br /> Definitions <br /> ID =Identification <br /> TPHg=Total petroleum hydrocarbons as gasoline <br /> LRL = Laboratory reporting limit <br /> ug/L = Micrograms per liter <br /> MtBE Methyl tertiary butyl ether <br /> NO = Constituent reported below the laboratory reporting limits <br /> A groundwater elevation versus time composite hydrograph is presented In Attachment B as Figure 3 <br /> Groundwater elevations decreased approximately 15 feet from December 2000 to October 2002 <br /> • Groundwater elevation data points plotted for 4Q2005 deviated approximately 0 54 feet from the <br /> arithmetic mean <br /> Concentration and groundwater elevation versus time hydrographs are presented for monitoring wells <br /> MW-1 through MW-7 (Attachment B, Figures 4 through 10) Included on the plots are bar diagrams <br /> representing monitoring well screened intervals Concentrations reported below laboratory reporting <br /> limits are plotted at one half reporting limits per US Environmental Protection Agency (EPA) protocols <br /> Groundwater samples collected between 2Q1999 to 2Q2004 reported MtBE below laboratory reporting <br /> limits in MW-3 Groundwater samples collected ranging from 2Q2005 to 4Q2005 reported MtBE at <br /> concentrations of 7 pg/L, 28 pg/L, and 57 pg/L, respectively in MW-3 <br /> Please forward questions or concerns regarding these activities to Bob Jackson at (805) 546-0455 ext 41 <br /> Sincerely, <br /> SECOR International Incorporated <br /> Bob W Jackson Jr <br /> Project Geologist <br /> • <br /> 4QO5MR 99840 SECOR International Incorporated <br />