SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County Environmental Health Department DIRECTOR M Donna Heran, REHS 2 . ? 1868 East Hazelton Avenue c. -� PROGRAM COORDINATORS U) < Stockton, California 95205-6232 Robert McClellan, REHS Jeff Carruesco, REHS,RDI - i.' • Kasey Foley,REHS .. P Website: www.sjgov.org/ehd Linda Turkatte,REHS q�rFDRa Phone: (209) 468-3420 Fax: (209) 464-0138 January 31, 2013 Ms. Catherine Kahler Mr. George Betker J.M. Equipment Company, Inc. Geo Properties, Inc. 321 Spreckles Avenue 2306 Jackie Court Manteca, California 95336 Oakdale, California 95361 Subject: Former J.M. Equipment Company LOP Case No.: 9401 1245 West Charter Way CUF No.:12607 Stockton, California 95206 GeoTracker ID No.: T0607700794 Dear Ms. Kahler and Mr. Betker: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Corrective Action Placa (CAP), dated 12 December 2012, prepared and submitted by your consulting firm, Geological Technics, Inc. (GTI), on your behalf for the above-referenced site. The CAP was submitted in response to the EHD directive by letter dated 09 October 2012. In the CAP, GTI proposes to implement Phase II of the remedial action plan over a period of twelve to eighteen months which includes: • Installation of 10 injection wells (IW-5 through IW-14) screened between 15 and 25 feet below surface grade (bsg) at locations illustrated on Figure 4 of the CAP; • Installation of 3 monitoring wells (MW-11 through MW-13) screened between 15 and 35 feet bsg at locations illustrated on Figure 4 of the CAP; • Collection of soil samples at five-foot intervals for lithologic classification during the advancement of the initial boreholes during installation of proposed injection and monitoring wells followed by collection of soil samples at 10 and 20 feet bsg for field observation and chemical analysis for total petroleum hydrocarbons as gasoline (TPH-g) and benzene, toluene, ethylbenzene and total xylenes (BTEX) by a California certified laboratory; • Injection of between 7.5 and 12.5 percent hydrogen peroxide into the 14 proposed injection wells over a two-day period on a weekly basis for the first month, and twice monthly for the remaining eleven months of the year; • Submittal of an addendum to the CAP to implement air sparging as an auxiliary remedial method if site conditions limit hydrogen peroxide injection at specific wells or where contaminant concentrations are low; • Monthly measurement of dissolved oxygen (DO), oxygen-reduction potential (ORP) and pH in groundwater from observation well OW-1, monitoring wells MW 5, MW 6, MW 9, and proposed wells MW-11, MW-12 and MW-13 to monitor remediation;