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<br /> Pacific
<br /> Pacific Pride — South EI Dorado Street Page 2
<br /> 3147 South EI Dorado Street October 18, 2011
<br /> Stockton , California 95206
<br /> Once the DPE system has been installed , AGE proposes to collect influent and effluent soil
<br /> gas samples and DPE (pre-treatment, intermediate-treatment, and post treatment) water
<br /> samples daily during approximately the first week of operating the remediation system . AGE
<br /> proposes to analyze the samples for TPH-g , BTEX, MTBE , TBA and 1 ,2-DCA. Based on
<br /> historical analytical data, the EHD believes TBA should be omitted and TAME should be
<br /> added to the list of analytes .
<br /> Also during the first week of operations , AGE proposes to monitor daily the operational
<br /> parameters : depth-to-water measurements, soil-vapor concentrations , DPE air flow, vacuum ,
<br /> total gallons of water extracted , pressure , pH , temperature, and volume of processed vapor.
<br /> Following the initial first week of operating the DPE system , AGE proposes to monitor
<br /> operational parameters weekly, and monthly collect and analyze influent and effluent soil gas
<br /> samples for TPH-g , BTEX and MTBE ; and monthly collect and analyze groundwater from the
<br /> pre-, med- and post-treatment sampling ports for TPH-g , TPH-d, BTEX, MTBE , ETBE , TAME,
<br /> DIPE , TBA, 1 ,2-DCA and EDB.
<br /> AGE proposes to process the DPE groundwater through three 2,000-pound vessels
<br /> containing liquid-phase activated carbon prior to discharging the groundwater into the sanitary
<br /> sewer system under City of Stockton permit; and process the DPE soil vapor through an
<br /> electric-heated catalytic oxidizer prior to entry into the atmosphere under San Joaquin County
<br /> Air Pollution Control District permit.
<br /> AGE proposes to submit a report of findings following the well installations, baseline
<br /> groundwater sampling event and installation of the DPE system; and quarterly thereafter,
<br /> AGE proposes to submit reports documenting the system performance .
<br /> The EHD approves the work plan as summarized above. On 30 September 2011 , the EHD
<br /> posted public notification of pending approval by this department of the Remedial Action Work
<br /> Plan to implement remediation at this site. The public has 30 days to express concerns
<br /> regarding the pending remediation at this site. If none is received, fieldwork may commence
<br /> on 31 October 2011 .
<br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by email at
<br /> vmccartney@sjcehd . com.
<br /> Sincerely,
<br /> Victoria L. McCartney, REHS V Nuel C. Henderson , Jr. , PG
<br /> Senior Registered Environmental Health Specialist Engineering Geologist
<br /> c: Mr. Timothy J . Cuellar, Advanced GeoEnvironmental , Inc. , 837 Shaw Road , Stockton,
<br /> California 95215
<br /> Mr. James L. L. Barton , PG, California Regional Water Quality Control Board Central
<br /> Valley Region , 11020 Sun Center Drive, Suite 200 , Rancho Cordova , California 95670
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