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ria �•,R•-.4 � � .�w=�+'.`_ ._ ,�..�;= � .�-�� �� -s�-,�,-� .,.�. <br /> V <br /> ycr <br /> .,, .. _ .: ..-- 771 .; ""!��"� �.pi�wM.��i 'Z+i• <br /> BROWN AND CALDWELL <br /> CONSULTING ENGINEERS <br /> August 8, 1988 <br /> _NVlROMFN_rAL HE'ALT <br /> Ms. Laurie Cotulla FERMIZ;j,ERV[CES " <br /> Environmental Health Division <br /> San Joaquin Local Health District <br /> 1601 East Hazelton Avenue <br /> Post Office Box 20Q9 <br /> ,.: <br /> Stockton,California,95201 <br /> 017-325$-04/1 <br /> E Subject: Final Site Investigation Recommendations for <br /> ARCO Station 6080,Located at 85 Loiiise,: <br /> Lathrop,California <br /> f <br /> o Dear leis.Cotulla: <br /> f Brown'and Caldwell recommends discontinuing any.further investigation and sampling at the <br /> subject site. Only slightly detectable concentrations of total petroleum hydrocarbons were <br /> detected in the soil during the initial investigation. The concentrations were 29 parts per <br /> million (ppm) and 10 ppm in borings AL-1 and AL-5, respectively. No impact to ground- <br /> water quality has been detected in the original or subsequent sampling. A summary of all <br /> a analysis is included in Tables 1 and 2. Complete laboratory reports are inclosed. <br /> €3 Table 1. Soil Samples <br /> h 8015 modified EPA 8020 <br /> r t <br /> Sample Depth, Total petroleum Total } <br /> 4 Date number feet hydrocarbons Benzene Toluene Xylene lead <br /> 4-24-87 AL-1-1 6.0-6.5 29 <br /> <'0.01 <0.01 <0.01 <0.01 <br /> AL-2-1 4.5-5.0 <10 <0.01 ,<0.01 <0.01 <0.01 <br /> AL-3-1 4.5-5.0 <10 <0.01 <0.01 <0.01 <0.01 ' <br /> Tk j s <br /> AL-4-1 4.5-5.0 <10 <0.01 <0.01 <0.01 <0.01 <br /> x�r- _ - -- --- -- <br /> -:--.-- --- -- AL-5-1--4:S-5.0- - -- - 10 - - ----<0.01 - ---t001-- <0.01 <0A1 P <br /> AL-6-1 5.0-5.5 <10 <0.01 <O.OI <0.01 x.01 ; <br /> 3 Note: All concentrations reported in milligram per kilogram(parts per million). <br /> F <br /> `FL _ 7@38STREET -SACRAM£NM CMIFORIIA"a147092.1 J.14.0123 - <br />