SITE INFORMATION AND CORRESPONDENCE_FILE 2

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WMPOI San Joaquin County Environmental Health Department DIRECTOR �o'•_.��.'�'O � Donna Heran,REHS z --� 600 East Main Street Q. PROGRAM COORDINATORS { Stockton, California 95202-3029 r3, s Robert McClellon, REHS Jeff Carruesco,REHS, RDI C'q P Website: www.sjgov.org/ehd Kasey Foley, RENS G i F o RLinda Turkatte,REHS Phone: (209)468-3420 Fax: (209)464-0138 July 13, 2011 Estate of Barbara J. Hyduke Ms. Cindy O'Neill, Executor Mr. Thomas O'Neil 3465 Gleneagles Drive Stockton, CA 95219 Subject: Valley Motors LOP Case#: 1166 800 E. Main St. CUF* 12540 Stockton, CA 95202 Global ID#: T607700430 The San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan for Groundwater Extraction, dated May 27, 2011, that was submitted by Upgradient Environmental Consultants (Upgradient). The work plan was required in EHD correspondences dated May 27, 2010 and April 21, 2011. The work plan proposes installing two 4-inch extraction wells on-site and continuing the groundwater extraction testing for remedial feasibility. Although the proposal meets the requirement to continue work at the site, statements included in the work plan condition commencement of the well installation, groundwater pumping/aquifer testing, and reporting results upon outstanding invoices being paid and an additional reimbursement request being processed by the CUF. In multiple phone conversations with Mr. Tom O'Neill and Mr. Clyde Hebbron of Upgradient, the EHD was made to understand that financial arrangements have been made and the work plan, once approved, will be enacted. . The EHD approves the work plan as necessary ([H&S 25296.10(c)(3)) and is approved with the following conditions: 1. The proposed 9.0-day aquifer pump test is to be reduced to 30-day phases. At the end of the first 30-day phase, an evaluation of the effectiveness, area of influence, and estimates of the petroleum hydrocarbon mass removed is to be submitted to Geotracker for review and Oyaluation. If it can be shown that groundwater extraction, ex-situ treatment, and disposal of the groundwater to the City of Stockton sewer is feasible and cost-effective but requires additional time and testing to support completely, the EHD will allow an additional 30 days of aquifer testing. 2. A complete schedule is to be submitted to Geotracker for review by the EHD on July 29, 2011. The schedule is to include: • date the two extraction wells will be installed, • dates the first groundwater pump test will start and end, • dates of additional pumping periods, if needed, • date the report of findings will be submitted to Geotracker, • dates the existing monitoring wells will be sampled and, • dates the semi-annual monitoring reports will be on Geotracker.