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1V <br /> E <br /> N"RONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Sup <br /> trvisors <br /> ~ s Donna K.Heran,R.E.H.S. 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> < —" Director Mike Huggins,R.E.H.S.,R.D.I. <br /> .' Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> �4`I ��• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Foa Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209)464-0138 Mark Bareellos,R.E.H.S. <br /> AUG 19 2004 <br /> DAVID ATWATER <br /> VAN DE POL ENTERPRISES INC <br /> P O BOX 1107 <br /> STOCKTON CA 95201 <br /> RE: Pacific Pride—West Lane SITE CODE 1288 <br /> 3230 North West Lane RO: 666 <br /> Stockton,CA 95204 <br /> San Joaquin County Environmental Health Department(EHD)has reviewed Additional Site <br /> Assessment Report—October 2003 dated January 28,2004,and Quarterly Report—First Quarter <br /> 2004 prepared by Advanced GeoEnvironmental,Inc.on your behalf. AGE proposed to install <br /> two groundwater monitoring wells,one located between soil borings P-3 and P-9,and one located <br /> approximately 50 to 75 feet south of soil boring P-6. <br /> Due to the presence of two nearby municipal water wells,it is EHD's recommendation that two <br /> cone penetrometer test(CPT)borings be advanced first to better characterize the hydrogeology <br /> and lithology prior to the installation of the two proposed monitoring wells. To identify and <br /> sample permeable zones most likely to accommodate migration of impacted groundwater toward <br /> the municipal w der their pumping influences,EHD recommends a target depth of <br /> approximate) 200 feet low surface grade(bsg)for the CPT borings. EHD recommends that <br /> the CPT borings anced in the following two locations: <br /> • One CPT boring advanced on or off-site near the municipal well located <br /> approximately 300 feet south of this site,and <br /> • One CPT boring advanced in the contaminated area between soil borings P-3 and P-9. <br /> EHD also recommends the advancement of one direct-push borehole adjacent to each CPT <br /> borehole to collect groundwater samples in each identified significant permeable water-bearing <br /> zone to assess for dissolved phase contamination in the deeper groundwater bearing zones. <br /> Please analyze all groundwater samples for methanol and ethanol,in addition to the analyses for <br /> total petroleum hydrocarbons quantified as gasoline(TPH-G)by Environmental Protection <br /> Agency(EPA)SW-846 method 8015B;*total extractable petroleum hydrocarbons quantified as <br /> diesel(TEPH-D),and total extractable petroleum hydrocarbons quantified as motor oil(TEPH- <br /> MO)by EPA SW-846 method 8015B;benzene,toluene,ethyl benzene,and total xylene(BTEX), <br /> 1,2-dichloroethane(1,2-DCA),dibromoethene(EDB),tertiary-butyl alcohol(TBA),methyl <br /> tertiarybutyl ether(MTBE),di-isopropyl ether(RIPE),ethyl tertiary-butyl ether(ETBE),and <br /> tertiary-amyl methyl ether(TAME)by EPA SW-846 method 8260B. Please ensure the reporting <br /> limit for 1,2-DCA is at least 0.5 micrograms per liter(gg/L)in groundwater. <br />