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V, -- •. y MR8117 r,r _ - ;j AIM 110 12 June 29, 1998 Mr. Ron Rowe Environmental Health-Division ENVIRONMENTAL HEALTH DIVISION San Joaquin County Public Health Services 304 E. Weber Ave. Third Floor 304 East Weber Avenue, 3"'Floor P. O. Box 388, Stockton CA 95201-0388 Stockton, California 95201-0388 Approved [a' Denied [] Re: Investigation Work Plan Addendum #3 t,W/Conditions SES DtK• -�- v Shell Service Station bkimZ Jut *4 341 Main Street Date ~3 by , Ripon, California WIC#204-6562-0804 Cambria Project#240-0342 Dear Mr. Rowe: As requested in your May 28, 1998 letter, Cambria Environmental Technology, Inc. (Cambria) is submitting this work plan addendum on behalf of Shell Oil Products Company(Shell) for a subsurface investigation at the site referenced above. The scope of this phase of work includes soil and ground water sampling using cone penetrometer testing (CPT), with the objectives of determining the three- dimensional extent of hydrocarbons and the location and design of ground water monitoring wells. Ground water monitoring wells will be installed during the next phase of field work to show whether or not fuel oxygenates have migrated from the site toward municipal water supply wells. This workplan also proposes to periodically extract ground water from the existing ground water monitoring well. PROPOSED SCOPE OF WORK Cambria will install approximately nine CPT borings in the locations shown in Figure 1. Cambria.will CAMBRiA also develop a program to extract ground water from existing ground water monitoring well MW-1 on a periodic basis. The San Joaquin County Department of Public Health Services (SJCPHS) will be ENVIRONMENTAL notified at least 48.hours prior to field work. All work will be allowed to be witnessed by SJCPHS staff. TECHNOLOGY,INC. One purpose of this investigative portion of the work will be to determine the nature and extent of 1144 65TH STREET, hydrocarbons in the assumed source are near the southeastern product dispenser. Because previous SUITE 8 phases of work did not detect significant amounts of total petroleum hydrocarbons as gasoline(TPHg) or benzene, toluene, ethylbenzene, or xylenes (BTEX) outside of the source area, this phase of the OAKLAND, investigation will also focus on defining the nature and extent of fuel oxygenates in soil and ground CA 94608 water in three dimensions. To that end, the goals of the investigation are (1) to obtain ground water � 0)420-0700 samples for chemical analyses, (2) to obtain soil samples for physical analyses, and (3) to obtain soil samples for chemical analyses. FAx:(510)420-9170