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L HEALTH DEPARTMENT <br /> ENVIR4NMENTA Y <br /> Qu,N SAN JOA COUNT U17I1S11peYl75Df'S <br /> Third jj�001' Carl Borgman,R.E.H. . <br /> Donna K.Heran,R.E.II.s. 304 East Weber Avenue, Mike 14ti.gins,R.E.H-S.,R.D.]. <br /> ar :< Director <br /> Stockton, California 95202-270 Dougtas w.wilco;,,R.E.H. . <br /> Al Olsen,R.E.H.S. X420 Margaret Lagorio,R.r.H.5. <br /> Iy'• <br /> Program Manage] Telephone: (209) 468-- Robert McClellon,R.E.H.S. <br /> _ - P b <br /> coif i;oR ` Laurie A.Cotulia,R.E.H-S. Fav (2a9) 464-0138 Mark Barcellos,R1.1-I.S. <br /> P]-op-ani Manager <br /> CONTACT: KEVIN MEEKS <br /> PAT & KATHLEEN MEEKS r <br /> 25355 HWY 99 <br /> ACAMPO CA 95220 <br /> RE: PACIFIC AUTO CENTER <br /> SITE CODE: 508378 <br /> 25355 HWY 99 <br /> ACAMPO CA 95220 <br /> On August 12, 2004, San Joaquin County Environmental Health Department (EHD) <br /> approved installation of one paw of <br /> dCOMW5 asPen <br /> xoposed in Cometer oln Pene trometes and oTe`ting and <br /> gradient monitoring wells MW4 a p <br /> Monitoring Well Installation Work Plan (the work pan) dated my 15, 2004 <br /> 00 mprepared <br /> epait ed by by <br /> Advanced GeoEnvtronmental,Inc. (AGE) an y but the two <br /> 5eptember.23, 2004. The CPT borin�se n ins tawere all d t date- <br /> vanced in proposed monitoring wells have not <br /> Based on the CPT stratigraphic profile,two grab groundwater samples <br /> s were <br /> fee llecg,and 129 <br /> tfrorn <br /> he first CPT boring at depths of 117 feet below surfaceg (1' g <br /> feet bsg to 132 feet bsg. To minimize ttlurpossibility <br /> s����°�d`�a�erov is collected at 135 feet bsg <br /> etween <br /> samples taken from the same boring,a g g CPT <br /> to 138 feet bsg from a separate CPT boring. An Hvatin report of ea fax COPY g the <br /> has not been prepared by AGE to date,but EHD has r�ceied from AGE <br /> analytical results of the three grab groundwater Csamples. Selected analytical results of <br /> the three CPT grab groundwater samples are as follows:w <br /> TPH- Total X lenes m, ,o EDB 1,2-DCA <br /> 3.2 ND <0.5u /l <br /> 117 ft-120 ft bs 1,400 470 ND <0.5u /1 ND <0.5u /1 <br /> 129 ft-132 ft bs 340 57 14 8.3 <br /> 135 ft-138 ft bs 1,400 490 <br /> TPH-g = Total Petroleum Hydrocarbons as gasoline; EDB = 1,2-dibromoethane <br /> 1,2-DCA = 1,2-dicholoroethane <br /> CA, no <br /> With the exception of the two lead scavenger additives�DB ns and <br /> theme respective Primary <br /> hyetroleum <br /> drocarbon contaminants were detected a <br /> Maximum Contaminant Level (MCL) established bdy tCaa fofo waia ter h do vngx dienttment of t�of the <br /> Services. Due to the existence of multiple p g lateral <br /> site on the east side of Frontage Road,the need to <br /> identifyle conversationthe vertical s itE you on of <br /> the contamination m groundwater is urgent. In p <br /> February 23, 2005,Eil 30, <br /> l directed you to install the remaining AGEstatdttheywere forme d by <br /> 2005. In a telephone conversation on March 18, 2005, <br /> the California Department of Transportation (CALTRANS) that the location of the <br />