SITE INFORMATION AND CORRESPONDENCE

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i ! San Joaquin County O,p4U'" c Environmental Health Department DIRECTOR Donna Heran,REHS r 1868 East Hazelton Avenue ¢ a PROGRAM COORDINATORS m. G1 allg Stockton, California 95205-6232 Robert McClellon,RENS Lk�`I,:_ Jeff Carruesco,RENS,RDI Website: www.sfgov.org/ehd Kasey Foley,REHS Linda Turkatte,REHS Phone: (209)468-3420 Rodney Estrada,REHS Fax: (209)464-0138 Adrienne Ellsaesser,REHS December 23, 2013 Ms erme lfahler s{u� ( -1� v t A C e vlr' � 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 Phase 11 Corrective Action Plan Implementation (Phase II CAP), dated 15 November 2013, prepared and submitted by your consulting firm, Ground Zero Analysis, Inc. (Ground Zero), on your behalf for the above-referenced site. Due to budgetary constraints, Ground Zero has proposed implementing Corrective Action Plan dated 12 December 2012, and approved by the EHD by letter dated 31 January 2013, in phases and has submitted Phase II CAP as a modification of Corrective Action Plan. In the Phase II CAP, Ground Zero has proposed a work plan that includes: • Installation of the first three of ten EHD approved injection wells (IW-5 through IW-7) screened between 15 and 25 feet below surface grade (bsg) at new locations illustrated on Figure 1 of the Phase II CAP; • Injection of hydrogen peroxide into the four original and three newly-installed injection wells; • Collection of soil samples at five-foot intervals for lithologic classification during the advancement of the initial boreholes during installation of the three proposed injection wells; collection of soil samples between 5 and 20 feet bsg for field observation and submittal of up to three soil samples per borehole for chemical analysis of total petroleum hydrocarbons as gasoline (TPH-g); benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) by a California certified laboratory; • Injection of between 7.5 and 12.5 percent hydrogen peroxide simultaneously into the four original and three newly-installed injection wells every three weeks, or less frequently based on oxygen concentrations in groundwater, for the remaining months of the fiscal year beginning no later than mid-January 2014, while suspending hydrogen peroxide injections at least two weeks prior to a quarterly groundwater monitoring event;