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ENVIRON-MENTAL HEALTH DEPARTMENT <br /> P4 U,IN SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> y ;< <br /> Director 304 East Weber Avenue,Third Floor Cad aorgman,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 /> Program Manager Douglas W.Wilson, R.E.H.S. <br /> Telephone: (209)468-3420 gn <br /> Margaret Ea oo,R.E.H.S. <br /> �ik5a g <br /> Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> JOHN PARKER FEB 2 8 2006 <br /> 2151 COUNTRY CLUB BLVD Copy STOCKTON CA 95204 <br /> RE: Boulevard Auto Service SITE CODE: 2424 <br /> 2151 Country Club Blvd. ROM 080 <br /> Stockton, CA., 95204 CUF#: 12962 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Cone Penetrometer Testing (CP7) Site Investigation — Third Quarter 2005 <br /> (Report) dated 18 October 2005 as submitted by Advanced GeoEnvironmental <br /> Inc (AGE) and has the following comments. <br /> The report covered the advancement of two onsite deep CPT and three offsite <br /> CPT borings under an AGE work plan approved by EHD in May 2005. <br /> CPTs "P-9" thru "P-13" were advanced to 125 feet below ground surface (' bgs), <br /> with the exception of "P-11", which was advanced to 97' bgs. Soil samples were <br /> collected from P-13 only and discrete ground water grab samples were collected <br /> from all of the CPTs and analyzed for petroleum hydrocarbons, fuel oxygenates, <br /> and lead scavengers. Soil samples were collected from "P-13" at 20' and 40' <br /> bgs in an attempt to complete the lateral delineation of the soil plume. Total <br /> petroleum hydrocarbons as gasoline (TPHg) and various BTEX constituents <br /> were detected in soil samples "P-13-20" and "P-13-40", the highest concentration <br /> being TPHg at 28 mg/kg in P-13-20. <br /> Laboratory analyses indicated that petroleum hydrocarbons have impacted the <br /> deepest and most down-gradient area investigated (P-11). EHD agrees with <br /> recommendations included in the Report that additional investigation is <br /> warranted further north and northeast of P-11. A work plan for this work <br /> should be submitted by April 7, 2006. <br /> EHD understands that the placement of monitoring wells into the municipal right <br /> of way requires bonding that exceeds your budget at this time. EHD has been <br /> patient and understanding with the financial concerns associated with this site <br /> investigation. With the information showing contamination more than 400 feet <br /> down gradient from the site, EHD will not allow any further delays in completing <br /> the site investigation. As soon as this investigative phase is complete, you will <br /> be required to install monitoring wells at areas and depths of concern identified <br /> by the CPT borings. Please plan for this requirement now. <br />