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r <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> a ?� Donna X. Henan,RSAN JOAQUIN COUNTYE.H.3. Program Cuurdlnaturs <br /> Director 304 East WeberAvenue,Third Floor Carl Rorgmar, R.E.H.S. <br /> ' Laurie A.Corolla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S, R.D.I.. <br /> •.�.ii oR,Hy4 Assfsrant Director Telephone: (209)468-3420 Margaret Lagorio,R.EM.S. <br /> Robert McCle_lon,R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carrueseo,R.E.H.S. <br /> Website:wwwzjgov.orgtehd/ Kasey Foley,R.E.H.S. <br /> SOhN PARKER ,IAN 0 3 2007 <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 CUF#: 12962 <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Cone Penetrometer Testing (CPT) Site Investigation — Third Quarter 2006 <br /> (Report) dated 10 November 2006 as submitted by Advanced GeoEnvironmental Inc <br /> (AGE)and has the following comments. <br /> The report documented the advancement of three offsite deep CPT borings under an <br /> AGE work plan approved by EHD in June 2006. CPTs 'P-14" thru "P-16" were <br /> advanced to 100 feet below ground surface ('bgs) in August 2006. Soil samples <br /> were not collected during this phase. <br /> Twelve ground water grab samples were collected and analyzed for petroleum <br /> hydrocarbons. Laboratory analyses indicate that benzene, Ethyibenzene, and <br /> xylenes were detected in boring "P-14' between 65' and 69 'bgs. The previous CPT <br /> investigation conducted in July 2005 indicated that ground water grab samples from <br /> CPT boring "P-11", just northwest of P-14, also were impacted by petroleum <br /> hydrocarbons at this depth. <br /> The Report included recommendations to install one offsite deep-screened <br /> monitoring well between borings CPT boring P-11 and P-15 yet three monitoring <br /> wells were proposed on Oxford Avenue (Figure 2). Additionally, recommendations <br /> included installing at least one onsite ground water extraction well in the vicinity of <br /> monitoring wells MW-1 and MW-10. A ground water extraction feasibility test was <br /> also recommended so that an evaluation of this method as a potential remedial <br /> action could be made. <br /> On December 29, 2006, the EHD met with your consultant to discuss the status of <br /> the site and the proposals included in the Plan. <br />