Mobil/ExxonMobil Technical Documents (abbreviated list):

“ExxonMobil Guide to Field Analytics”, December, 2003, prepared with assistance from Bob Lee, Groundwater Services, Inc., Houston, Texas.

Response to Texas Natural Resource Conservation Commission request to add features to the March 1993 (see below) statistical procedure used to compare RCRA groundwater monitoring results to background at the Lower Neches Valley Authority North Regional Treatment Plant (LNVA-NRTP), March 1999.  In addition to the requested statistical procedure, this response provided a request and technical basis to discontinue groundwater monitoring altogether.

“Method for Preparing Statistical Control Charts of Ground-Water Monitoring Results At The Mobil Refinery in Paulsboro, NJ”, June 1997.

“Statistical Comparisons of RCRA Interim Status Groundwater Monitoring Results”, evaluations performed semiannually 1992-2003 for two hazardous waste management areas at Mobil’s Chalmette Refinery.  Also includes identification and evaluation of groundwater monitoring anomalies, and recommending specific actions to address them.

“Method For Comparing >60% “ND” RCRA Ground-Water Monitoring Parameters to Background At The LNVA-NRTP”, December 1994.

MWU.EXE, August 1994.  A computer program to perform the statistical test required in NJDEP Discharge-To-Groundwater permits at service stations, this program was distributed to Mobil Marketing field engineers.  Last revised August 1997 (v. 2.0) to reflect new NJDEP guidance.

“A Procedure For Establishing An Upper Concentration Limit Based on Normal Distribution Probability, The Detection Limit, And The Highest Detected Value:  The Projection Interval”, June 1994.  This procedure is an extension of the July 1990 procedure below, and application to the Mobil Chemical Company Plastics Division plant in Wooodland, California.

“Statistical Method For RCRA Ground-Water Monitoring At The LNVA-NRTP”, March 1993.  Evaluation and modification of EPA’s Shewhart-CUSUM statistical procedure to account for less available background data.

“New RCRA Statistical Procedure For the PIB and SIB”, December 1992.  Extension of the May 1992 statistical procedures for WMA-2 and WMA-6 to two impoundment basins at Mobil’s Beaumont Refinery.

“Procedure For Statistically Comparing Ground-Water Monitoring Results to Background Values at WMA-2 and WMA-6”, May 1992.  For Mobil’s Beaumont Refinery, this RCRA groundwater monitoring statistical procedure established 11 ppb as the limit for 3 Volatile Organic Compounds for which all background results were “ND<5 ppb”, provided a basis for this limit, and proposed a modification to standard RCRA groundwater monitoring practices to reduce analytical costs by 75%.

“Evaluation of Soil TPH Background Data:  Statistical Calculation of Upper Concentration Limits”, May 1992.  Prepared for Mobil’s Beaumont Refinery, this work established a UCL for background values of TPH of 654 µg/g for use in closure evaluations for two hazardous waste management areas.

“A Procedure For Establishing An Upper Concentration Limit Based on Normal Distribution Probability, The Detection Limit, And The Highest Detected Value”, July 1990.  A new, unique statistical procedure developed for Mobil’s Beaumont Refinery to address the need to statistically compare groundwater monitoring results to background values when nearly all the background data are “ND”.  The refinery used this procedure in their closure of three Hazardous Waste Management Areas.

“Evaluating Asymptotic Approach to Ground-Water Cleanup:  ASYMFIT”, December 1989.  A computer program and User’s Guide, based on Florida DER guidelines, distributed to Mobil Marketing field engineers, the purpose of this program is to help identify when continued remediation will not significantly reduce contaminant levels further.  The program and User’s Guide were last revised (v. 3.6) in February 1992, and included in marketing’s Site Closure Manual.