ARCHIVED REPORTS XR0006778 - Laserfiche WebLink

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1 • Mr Michael Infurna Page 2 are summarized in Table 2 Laboratory data sheets and chain of custody documentation are included in Attachment B MTBE was added to the constituents of concern list pursuant to correspondence from your office dated August 1, 1996, which requested that MTBE and oil and grease be considered constituents of concern and should be sampled for two consecutive quarters In response to the referenced correspondence, Ground Zero contacted the laboratory to review the chromatograms from the second quarter 1996 analytical data to quantify MTBE MTBE was determined to be nondetectable in well MW3 and present in wells MW1 and MM2 at concentrations of 28 and 17 ppb, respectively Table 2 was modified to reflect the results The revised laboratory report for the second quarter 1996 data is included in Attachment C Oil and grease was not added to the constituents of concern list based on three consecutive quarters of nondetectable results in well MW2 in 1994/1995 Oil and grease was initially detected in well MW2 August 1994 but was nondetectable in three subsequent sampling rounds No oil and grease has been detected in either well MW 1 or MW3 Analytical results of petroleum hydrocarbon constituents in groundwater at the site suggests that the site has reached static conditions Ground Zero recommends reducing the groundwater monitoring and sampling frequency to an annual basis at this site • If you have any questions, please contact the undersigned at (209) 952-3481 I Respectfully, Ground Zero Analysis, Inc qzt',�Lc,��"RE 0 GFaZ Jeanne Buckthal � GREGQRY P. S f Geologist STAHL No 5023 LP Gregory P Stahl R G 503 Gre o . 2 r�lF OF CRLI��`P ' _ CA Certified Hydrogeologist 264 Attachments PC. John Pestana QTIP Trust Ms Elizabeth Thayer, RWQCB Sacramento