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! �' n <br /> S EIC0R <br /> . Ms Vicki McCartney <br /> October 20, 2005 <br />! Page 2 <br />! DISCUSSION <br /> 3 <br /> On August 8, 2005, Gettler-Ryan Incorporated (G-R) performed 3Q2005 groundwater <br />! monitoring and sampling (Attachment A) Groundwater elevation across the site ranged <br /> from -10 80 to -11 54 feet below mean sea level (msl) Groundwater elevation across the <br /> site decreased an average of 1 55 feet from the previous sampling event Groundwater <br />! flow was calculated to the northeast at an approximate gradient of 0 009 'A summary of <br /> total petroleum hydrocarbons as diesel (TPHd), as motor oil (TPHmo), and as gasoline t <br /> (TPHg), benzene, and methyl tertiary butyl ether (MtBE) laboratory analytical data is <br />! presented in the table below Please note that Gettler-Ryan reports the data in parts per <br /> billion (ppb) while Lancaster Laboratories reports the data In micrograms per liter (pg/L) <br />! Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 3 Concentration in pglL(well ID) Concentration in pglL(Well ID) <br /> Total Samples <br />! TPHd* 3 120155(MW-2) 1,500/1,100(MW-3) <br /> TPHmo* 3 2801240(MW-1) 530/240(MW-3) <br /> r <br /> l <br /> TPHg 2 ND 7,300(MW-3) <br /> ie Benzene 1 ND 830(MW-3) <br /> N <br />! MtBE 3 4(MW-1) 3,500(MW-2) — <br /> a <br /> EXPLANATION <br /> MDL = Method detection limit <br /> pg/L = Micrograms per liter <br />! ND=Non detect <br /> Note , <br /> *Indicates samples where analyses were run before and after silica gel cleanup(before/after) <br /> If you have any questions or concerns regarding these activities, please feel free to contact . <br /> Stephanie Furgal at (559) 271-2650, ext 234 <br /> Sincerely, <br /> Y <br /> SECTOR In ernational Incorp <br /> x <br /> Stephanie Furgal <br /> Project Manager <br /> IN IFiles%Projects\Chevron\Retail\#9-20331Periodic Monitormg12005\3Q2005 QMR 92033 doc <br />