SITE INFORMATION AND CORRESPONDENCE FILE 1

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fjeofogicidTechnics Inc. • • Page 2 Meays- SJCPHS George's Service-Addendum August 29,1995 Geological Technics Inc. recommends that the lateral and vertical extent of impacted soil and groundwater be defined and remedial alternatives be evaluated. Our proposed approach to this problem is outlined below. • Hold a meeting with Mei and George Teranishi, Mary Meays, Don Light, and Ray Kablanow to discuss cost effective options and approaches and to develop a schedule of tasks to be performed. Items to be discussed would include the following, plus other concerns or alternatives. • To move forward towards site characterization Geological Technics Inc. recommends that the magnitude and lateral extent of the plume be evaluated using cost effective reconnaissance techniques i.e. a passive soil gas survey. The boundaries of the plume identified with the reconnaissance techniques would then be confirmed using conventional soil and groundwater sampling methods i.e. soil borings and groundwater monitoring wells/Hydropunch. The locations and methods of plume delineation confirmation testing would be proposed in a site characterization work plan. • We recommend that George's Service seek pre-approval from the USTCFP for conducting the passive soil gas survey and preparing the site characterization workplan. Once the soil gas survey has been completed and the results written in a report with conclusions, and the work plan has been prepared and approved by the County, George's Service could solicit bids using the work plan as the bidding documents' scope of work. In this manner unit cost can be evaluated line item by line item and additional work could be performed using these unit costs by obtaining cost pre-approval from the USTCFP. • Once the site's plume has been fully characterized then remedial options could be evaluated which may include but not limited to intrinsic attenuation, excavation, groundwater pump and treat, and/or air sparging and soil vapor extraction. The nature of the site may require that an approach utilizing combined technologies be employed to mitigate this site. Goals of site remediation would be to remove the source of petroleum contamination to the groundwater, containment of the groundwater plume, mitigation of the groundwater plume to protect groundwater resources, and to free this site from the environmental liability it now has. As a matter of strategic project management we recommend that George's Service conduct all site characterization and remediation activity under the supervision and approval of the San Joaquin County Public Health Services in order to ensure that maximum reimbursement is available from the USTCFP.