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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit SupervisorsP Cp <br /> Donna K. Heran, R.E.H.S. <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> c :;. <br /> N <br /> Laurie A. Cotulla, R.E.H.S. $tOClCtOn,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> Program Manager Douglas W. Wilson, R.E.H.S. <br /> Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> 0 /FORS <br /> Fax: (209) 464-0138 Robert Iv[ccleuon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ left Carraeseo, R.E.H.S. <br /> JOHN PARKER (JUN O 2 MIS <br /> 2151 COUNTRY CLUB BLVD <br /> STOCKTON CA 95204 <br /> RE: Boulevard Auto Service SITE CODE: 2424 <br /> 2151 Country Club Blvd. ROM 080 <br /> Stockton, CA 95204 CUM 12962 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Work Plan Addendum —April 2006 (Plan) submitted by Advanced <br /> GeoEnvironmental Inc (AGE) and has the following comments. <br /> Based on a previous CPT investigation where the most north/northeasterly <br /> boring (P-11) evidenced elevated levels of petroleum in the shallow and <br /> intermediate saturated zones, EHD required the lateral and vertical extents of the <br /> ground water petroleum plume to be defined and a work plan submitted to <br /> address this requirement. <br /> The Plan proposes the installation of three (3) additional CPT soil borings offsite <br /> to the northeast of the site in the City of Stockton right of way. CPTs -14, 15, <br /> and 16 will be multiple hole, step-down borings and are to investigate the soil <br /> and groundwater conditions to a maximum depth of 100 feet below ground <br /> surface (`bgs). Selected soil samples and multiple ground water grab samples <br /> are to be collected and analyzed for TPHg, BTEX, and the fuel oxygenates and <br /> lead scavengers. <br /> In correspondence dated February 28, 2006, EHD also commented that <br /> monitoring wells are needed and were to be placed during this phase of the <br /> investigation. This requirement was not included in the Plan. In order to <br /> emphasize the importance of gathering repeatable ground water data for this <br /> site's down gradient investigation, EHD reiterates the requirement as follows. <br /> You are hereby directed to install multiple monitoring wells in the down <br /> gradient locations and depths to support conclusions of plume delineation. <br /> The report of findings for CPT-14, 15, and 16 is to include a work plan for <br /> the installation of these monitoring wells. The report of findings/work plan <br /> is due at EHD within 90-days from the end of CPT-14, 15, 16 installation. <br />