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r ► <br /> S E C O R - <br /> L} <br /> • Ms. Victoria McCartney <br /> JAN 2 3 2006 <br /> January 23, 2006 ENVIROi 1%1FNT HEALTH <br /> Page 2 PEMOIT/SERMES <br /> not sampled due to a damaged well casing'. Representatives from G-R observed that the <br /> box frame was gone completely, a portion of the sheet metal skirt around the casing had <br /> been exposed, and the casing has been broken on one side. In addition, soil from a nearby <br /> stockpile spilled over onto MW-15D. After uncovering MW-15D, it was observed that the <br /> well box had sustained further damage after it was originally documented during the August <br /> 2005 sampling event. Continued soil stockpiling activities at the site, by the City of <br /> Stockton, have led to the damage of the above named wells. SECOR feels it would be cost <br /> prohibitive to repair or replace these wells before the City has completed its work. <br /> Groundwater elevations in remaining wells across the site ranged from -13.01 to -13.50 feet <br /> below mean sea level (msl), and decreased an average of 0.50 feet from the previous <br /> sampling event. Groundwater flow was calculated to the southeast at an approximate <br /> gradient of 0.002 to 0.004. A summary of total petroleum hydrocarbons as gasoline <br /> (TPHg), diesel (TPHd), and motor oil (TPHmo), benzene, and methyl tertiary butyl ether <br /> (MtBE) laboratory analytical data are listed below. <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 7 Concentration in E►g/L(well ID) Concentration in yg/L(Well ID) <br /> Total Samples <br /> • TPHg 2 X50 4,900(MW-15D) <br /> TPHd 7 110(MW-16) 3,200(MW-15) <br /> TPHmo 7 240(MW-17) 1,300(MW-15) <br /> Benzene 3 <0.5 7QQ{MW-15) <br /> MtBE 3 X0.5 3(MW-14) <br /> Explanation: <br /> ug/L=Micrograms per Liter <br /> MDL=Method Detection Limit <br /> If you have any questions or comments regarding these activities, please feel free to <br /> contact Stephanie Furgal at (559) 271-2650 extension 234. <br /> Sincerely, <br /> SECOR International Incorporated <br /> Stephanie Furgal <br /> Project Manager <br /> ' Gettler Ryan Incorporated; January 9, 2006: Groundwater Monitoring and Sampling Report, Fourth <br /> Quarter Event of November 29, 2005. <br /> N:1FileslProjectslChevron\Retaill#9-05571Periodic Mon itoring1200514Q14Q2005 QMR 90557.doc <br />