SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Jamar Service Station Page 3 of 4 4075 East Main Street April 13, 2015 Stockton, California 95215 • Maintain a vacuum of one-hundred inches of water or less when purging and sampling; • Analyze soil gas collected from the soil gas probe boring closest to the former waste oil tank for total petroleum hydrocarbons as diesel (TPH-d) and naphthalene by EPA Method TO-17 using sorbent tubes; include a replicate sample and trip blank, all stored at four degrees Celsius, in addition to analyzing soil gas samples by Method TO-15; • Report the percent of oxygen in the soil gas samples in addition to analyzing the soil gas samples by EPA Method TO-15 for total petroleum hydrocarbons as gasoline (TPH-g); benzene, toluene, ethylbenzene and total xylenes (BTEX); methyl tertiary- butyl ether (MTBE); ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), di-isopropyl ether (DIPE), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA) 1,2-dibromoethane (EDB), naphthalene and 1,1-DFA; • Report all soil gas results in micrograms per cubic meter (Ng/m3); reporting limits must be less than 85 micrograms per cubic meter (Ng/m3) for benzene, less than 1,100 pg/m3 for ethylbenzene, less than 93 pg/m3 for naphthalene and less than 100 ug/m3 (0.1 micrograms per liter) for 1,1-DFA; • Instead of comparing soil gas analytical results to ESLs and CHHSLs, determine whether the analyte concentrations meet criteria listed in the Low-threat Underground Storage Tank Case Closure Policy (LTCP); additional site investigation may be warranted based on the results; • Notify the EHD at least two weeks prior to performing the field work and note that field work cannot begin sooner than five days after the permits have been issued; and • Postpone collecting soil gas samples until after the passage of a frontal system, and within five days of irrigation or a significant rainfall event of a half inch or greater. With these conditions, the EHD approves the Work Plan. This approval is not a concurrence or endorsement for any other conclusions, conditions, or implications contained in the Work Plan dated 05 March 2015. In January 2015, the EHD received permit applications to advance two soil gas borings onsite and two off-site at 933 South Oro Street in Stockton, a check for $1040, Master File Record form, and Licensed Contractor Declaration (LCD). Since receiving these items, the EHD has implemented a new fee policy. As a result, the EHD requires only $420 be submitted for the four soil gas probes. Any additional staff time over the initial four-hour fee will be billed to the identified responsible party. Please notify the EHD whether the original check should be returned and a new check issued for $420 or whether the current check should be retained and a refund submitted, if appropriate, following the field work. Also, the EHD will not issue the permits until the access agreement has been submitted to this agency.