ARCHIVED REPORTS XR0006116 - Laserfiche WebLink

Home Browse Search

• The most recent sample event (July 15, 2005) continues to show a reduction in TPHg in the groundwater Comparing TPHg concentrations prior to over-excavation of the UST area (MWIO/R1A and RIB) show concentration reduction from 54,000 ug/L (November 2002 at RIA) to 18,000 ug/L (July 2004 at MWIO) to the most recent 4,300 ug/L (July 2005 at MW10) Similar reductions are evident in wells 6A and 8A Well 6A contained 19,000 ug/L TPHg in November 2002, 16,000 ug/L in July 2004 and currently contains 8,700 ug/L (July 2005) Although MW8A was not installed prior to the over-excavation, destroyed well MWl was in close proximity MWI contained 34,000 ug/L in November 2002, MW8A contained 16,000 ug/L in July 2004 and currently contains 3,200 ug/L (July 2005) TIME FRAME October 14, 2005 Fourth Quarter 2005 monitoring and sampling To be coordinated with AGE for same time DTW and sampling October 17, 2005 Start pumping at well MW10 with treated water discharge to 20,000 gallon storage tank at 5 gpm LIMITATIONS The discussion presented in this report is based on the following 1 The observations and data collected by field personnel 2 The results of laboratory analyses performed by a state certified analytical laboratory 3 Our understanding of the regulations of San Joaquin County and State of California Changes in groundwater conditions can occur due to variations in rainfall, temperature, local and regional water use, and local construction practices In addition, variations in the soil and groundwater conditions could exist beyond the points explored in this investigation State Certified Laboratory analytical results are included in this report This laboratory follows EPA and State of California approved procedures, however, WEGE is not responsible for errors in these laboratory results The services performed by Western Geo-Engineers, a corporation under California Registered Geologist 43037 and/or Contractors License 9513857, have been conducted in a manner consistent with the level of care and skill ordinarily exercised by members of our profession currently practicing under similar conditions in the State of California and San Joaquin County Our work and/or supervision of remediation and/or abatement operations, active or preliminary at this site is no way meant to imply that we are owners or operators of this site Please note that the known contamination of soil and/or groundwater must be reported to the appropriate agencies in a timely manner No other warranty expressed or implied is made 12 Sanchez QM 3`d 2005