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Vol Chevron 1%W11 Chevron U.S.A. Inc. 2410 Camino Ramon,San Ramon, California-Phone(415) 842-9500 Mail Address:P.O.Box 5004,San Ramon,CA 94583-0804 Marketing Department February 7, 1991 KEW Ms.Margaret Lagodo U =1Vh San Joaquin County Environmental Health F E B 0 8 1991 P.O. Box 2009 Stockton, CA 95201 ENVIRONMENTAL HEALTH PERMIT/SERVICES Re: Chevron S.S. # 9-4275 2905 West Benjamin Holt Drive, Stockton, CA Dear Ms. Lagorio: Enclosed is a work plan dated February 4, 1991 which was prepared by Chevron's consultant, Earth Technology Corporation(ETC), to describe a field test of the Cone Penetrometer Test(CPT) and BAT Probe at the site referenced above. This field test was proposed and explained in a letter dated December 4, 1990 from Mr. Clint Rogers of Chevron to Mr. Gerald Facino of ETC(a copy of which was sent to your attention). A copy of the letter is enclosed with this cover letter. The purpose of the field test is to determine the effectiveness of the CPT to accurately define the stratigraphy and the hydrogeologic properties of the subsurface and to determine the effectiveness of the BAT probe as a means of determining and monitoring the extent of groundwater contamination. The field test was planned in such a way as to allow the relatively new CPT and BAT methods to be directly compared with the widely accepted methods of soil borings and groundwater monitoring wells. A work plan dated June 1990, which was prepared by Chevron's consultant, Groundwater Technology Incorporated(GTI), to propose the installation of additional groundwater monitoring wells, has already been reviewed and approved by your office. The enclosed ETC work plan is submitted as a modification of the previously approved GTI work plan. All required permits have been received from San Joaquin County and the City of Stockton for the field test. Chevron is very interested in performing the field test as soon as possible and can schedule the field work to begin as soon as February 15, 1991. Chevron would be extremely pleased to have representatives from San Joaquin County, the Central Valley RWQCB, and all other interested regulatory agencies on site for the field work. Chevron would like to make the results of this field test widely known in an attempt to spread information concerning the CPT and BAT among regulatory officials. It is hoped that a successful field test would prompt regulatory acceptance of the CPT and BAT probe as an acceptable alternative to monitoring wells. Chevron has delayed a plan to install additional monitoring wells at another location pending the results of this field test. In addition, Chevron has construction scheduled at this site in March 1991 which is unrelated to the field test and which would greatly interfere with the field work. For all the reasons put forth here, Chevron would appreciate your prompt concurrence with the proposed field test as described in the enclosed work plan. Based on phone conversations that Mr. Clint Rogers of Chevron has had with you and with Mr. Gordon Boggs of the CVRWQCB, Chevron looks forward to performing the field work as scheduled on February 15. If you have any problems with this schedule or any questions regarding this project, please bring these to the attention of Mr. Clint Rogers of Chevron at(415) 842-8658 as soon as possible.