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San Joaquin County Environmental Health Department DIRECTOR �o-_,�•.'cp � Donna Heran,REHS r y 600 East Main Street a: ^� PROGRAM COORDINATORS < Stockton, California 95202-3029 Robert McCleflon, REHS • Jeff Carruesco,REHS,RDI Cq••..�-. 0 Website: www.sjgov.org/ehd Kasey Foley,REHS �/FOR Phone: (209)468-3420 Fax: (209) 464-0138 July 21, 2010 Mr. Wesley Parkinson Parkinson's 1-5 ARCO Service Station 3250 West Hammer Lane Stockton, California 95209 Subject: Parkinson's 1-5 ARCO Service Station 3250 West Hammer Lane Stockton, California 95209 Dear Mr. Parkinson: The San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan for Pilot-Scale 03IH2O2 Injection Test (work plan), dated 22 June 2010, prepared and submitted by your consulting firm Stratus Environmental, Inc. (Stratus) on your behalf for the above-referenced subject site. In the work plan, Stratus proposes to perform a ninety-day pilot test to determine whether ozone/hydrogen peroxide (03/H2O2) injection will reduce the concentrations of petroleum hydrocarbon contamination at your site and assess what affect, if any, this process will have on groundwater quality. The EHD approves the work plan that includes the installation of four proposed nested 03/1-12O2 injection wells (IW-1 through IW-4) and one proposed monitoring well (MW-7) at locations illustrated on Figure 3 of the work plan. Each of the four 03/H2O2 wells will contain two sparge points, one with a gas diffuser for 03 sparging installed from approximately twenty-one to twenty-three feet below ground surface (bgs), and one with a stainless steel slotted well screen for H2O2 injection installed from approximately eighteen to nineteen feet bgs. The proposed monitoring well (MW-7) will be screened from approximately ten to twenty-five feet bgs. During the initial thirty days of the pilot test, Stratus proposes to inject only 03 into the four 03/H2O2 wells in fifteen-minute cycles continuously for twenty-four hours per day. Based on the field conditions and preliminary results from the first month's pilot test, Stratus proposes to possibly increase the 03 injection cycles to twenty minutes during the second and third months. Stratus proposes to commence injecting H2O2 beginning the second month and continuing the H2O2 injections through the third month. Stratus estimates that approximately thirty-one to forty-five pounds of 03 and approximately one hundred-fourteen gallons of H2O2 will be injected into the groundwater over the course of the ninety-day pilot test.