SITE INFORMATION AND CORRESPONDENCE

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I - i r San Joaquin County DIRECTOR Donna Heran, REHS pUiN Environmental Health Department ASSISTANT DIRECTOR G 600 East Main Street Laurie Cotulla,REHS < < Stockton, California 95202-3029 PROGRAM COORDINATORS _ Carl Borgman, REHS Website: . oV.Or /ehd Mike Huggins,REHS, RDI wwws °tiFo'ac 15 9 Margaret Lagorio, REHS Phone: (209) 468-3420 Robert McClellon, REHS Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI Kasey Foley, REHS NOV 0 2 2007 RAYMOND GREER RAYMOND GREER CONSTRUCTION ALBERT & WANDA VELDSTRA 1601 CABRILLO CT 15634 STEINEGUL ROAD MODESTO CA 95355 ESCALON CA 95320 RE: Former Greer Construction SITE CODE: 2021 15634 Steinegul Road Escalon CA 95320 From October 22 to October 27, 2007, the San Joaquin County Environmental Health Department (SJC/EHD) reviewed your site data and held several discussions with your consultant, Ms. Lorraine Sawyer, PG, who is with ATC Associates Inc. (ATC). The purpose for the review and discussions was to assist the site characterization and remediation program for your site, and were the result of telephone proposals by Ms. Sawyer to advance your site investigation. Specifically, Ms. Sawyer still favors installation of the clustered wells and deep well nearly as originally proposed but was not approved by the SJC/EHD (SJC/EHD letter dated 20 August 2007). In the discussions with Ms. Sawyer, it was agreed that ATC would propose to: • Install an additional cone penetration test (CPT) boring northwest of MW3 and another CPT west of MW4 to obtain deeper hydrogeological profiles in those areas and to collect grab groundwater samples from permeable zones of interest; • Install shallow groundwater monitoring wells screened between 70 and 90 feet below surface grade (bsg), and across the water table northwest of MW3 and west of MW4; • Install three deeper monitoring wells screened approximately from 95 to 100 feet bsg; • Install the deep well screened approximately 124 to 129 feet bsg to verify vertical extent of impacted groundwater; and • Install the three previously approved shallow groundwater monitoring wells screen approximately 70 to 90 feet bsg in the field east of the paved area on the site. Submit a work plan addendum for the above proposals; a technical justification for each specific item should be included in the addendum. If alternative methods can be employed to achieve the site characterization goals for which the items above were proposed, they can be substituted in the work plan addendum, but a technical justification must be included for each proposed change.