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ENVIRON'rdIENTAL HEALTH 11EPARTMENT <br /> C, SAN JOAQUIN COUNTY <br /> Q y� Donna K. Heran, R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> • c4�iFoacP• Program Manager Telephone: (209)468-3420 Douglas W.Wilson,R.E.H.S. <br /> Margaret Lagorio,R.E.H.S. <br /> Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> SANDRA YACOUB JUL 2 4 2006 <br /> C/O ANNA & ROMEO YACOUB <br /> 3978 S HWY 99 E FRONTAGE ROAD <br /> STOCKTON CA 95215 <br /> RE: Low Price Auto Class/Former Texaco SITE CODE: 1322 <br /> 3978 S Hwy 99 E Frontage Road <br /> Stockton CA 95215 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed <br /> Additional Site Assessment Work Plan (Work Plan) dated July 14, 2006, submitted on <br /> your behalf by Advanced GeoEnviron mental, Inc. (AGE) and has the following comments. <br /> In the Work Plan AGE proposes to continue the investigation at this contaminated <br /> underground storage tank site in two phases. Phase I would involve analysis by fate and <br /> transport modeling of the potential for the petroleum hydrocarbon contamination at this <br /> site to impact the onsite domestic well. Phase II, if considered necessary based on the <br /> outcome of Phase I, would include the installation of one groundwater monitoring well <br /> near the former dispenser island area. <br /> Per the California Code of Regulations, Title 23 Division 3, Chapter 16, California <br /> Underground Storage Tank Regulations, all sites that have an unauthorized release of <br /> petroleum hydrocarbons from an underground storage tank must conduct an investigation <br /> to determine the vertical and lateral extent of the contamination resulting from that <br /> release. Preliminary investigations at this site have documented contamination to soil and <br /> groundwater, the extent of which remains undefined. While researching the construction <br /> details of the onsite domestic well and conducting fate and transporting modeling may <br /> provide important information helpful to development of the overall conceptual site model, <br /> it does not replace completing an investigation of the actual extent of the contaminant <br /> impact to soil and groundwater. Fate and transport modeling will be appropriate following <br /> completion of the site characterization, at which point the relevant data for the modeling <br /> will be in hand. SJC/EHD does not believe such modeling is appropriate at this time. The <br /> well inspection should be conducted at this time as part of the site characterization. <br /> SJC/EHD approves the installation of one groundwater monitoring well as proposed in the <br /> Work Plan. The Work Plan does not include collection of soil samples during well <br /> installation, a consequence of the low overhead space available. SJC/EHD recommends <br /> completion of the assessment of the vertical extent of impacted soil near boring P-3, <br /> perhaps with a geoprobe. Based on the static depth to water measured in borings B-1 <br /> and B-2, which were 77 and 83 feet below surface grade (bsg) respectively, SJC/EHD <br /> recommends the screen interval of the proposed well be extended to at least 85 feet bsg. <br />