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' Advanced { ' -
<br /> GeoEnvironmental., In-C . ,
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<br /> , r
<br /> 1 25 Aprilr2000,
<br /> AGE-NC Project No 96-0232
<br /> Mr Marry Hartzell
<br /> 1 Central Valley Regional Water Quality Control Board_
<br /> 3443 Routier Road, Suite A -
<br /> Sacramento, CA 95827 i
<br /> 1
<br /> Subject Revision to Work Plan Addendunn dated 08 March 2000
<br /> 1 FLAG CITY CHEVRON -6421 Capitol Avenue, Lodi, California ,
<br /> Dear Mr Hartzell - h
<br /> 1 Adval7eed GeoEnvironmental, Inc (AGE)has previously submitted a work plan addendum (dated 08 March
<br /> 2000) for advancement of five cone penetrometer testing (CPT) soil borings and for installation of five
<br /> 1 clustered ground water monitoring wells for the site located at 6421 Capitol Avenue Lodi, California The
<br /> number of clustered ground water monitoring wells and designated screen interval depths-%N ere to be based
<br /> on the CPT findings The location of the site is illustrated on,Figure 1 A plan of the site is illustrated on
<br /> Figure 2
<br /> Between 28 March and 04 April 2000, five CPT soil borings P-13, P-14, P-15, P-16 and P-17 ".ere advanced �
<br /> 1 at the site to maximum depths of 130 feet below surface grade CPT lithologic data collected from borings
<br /> P-13 P-14, P-I5, P-16 and P-17 were utilized to construct geologic cross sections A-A', B-B' and C-C' (see
<br /> j Figures 3 4 and 5) Based on analysis of CPT lithologic data, ground water samples were collected from P-
<br /> 13, P-1.1, P-15, P-16 and P-17 in areas of lithology changes and intervals of porous and permeable material _
<br /> Selected ground water samples were analyzed by KIFF Analytical Laboratory,'a State of California
<br /> Department of Health Services (DHS)-certified laboratory for
<br /> 1 • Total petroleum hydrocarbons quantified as diesel (TPH-d)by EPA Method 801 5-M,
<br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile aromatic compounds
<br /> 1 (benzene, toluene, ethyl benzene and xylenes BTEX),methyl-tertiary butyl ether(MTBE),ethylene
<br /> dibromide(1,2-dibromoethane), 1,2-dichloroethane (I 2-DCA),tertiary butanol (TBA) di-isopropyl
<br /> ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA
<br /> 1 Method 8260B
<br /> Analytical results of the grab ground water }samples collected from P-13, P-1.1, P-15, P-16 and P-17 are
<br /> summarized in Table 1 Laboratory analysis'of nineteen ground water samples detected MTBE,TBA,ethanol
<br /> or methanol compounds in ten ground water samples, the laboratory analysis of the ground water samples
<br /> did not detect TPH-g,TPH-d, BTEX,DIPS, ETBE ETBE,TAME, 1,2-DCA or EDB The laboratory reports
<br /> (KIFF Analytical Report Nos 16399, 16400 and 16411 through 3I879) and chain-of-custody forms are
<br /> • presented in Appendix A Procedures and findings derived from the CPT investigation will be presented in
<br /> greater detail iii April, May and June's Quarterly Report
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<br /> 4005 North Wilson Way Stockton'
<br /> California 95205
<br /> Telephone (209)467-1006 FAX (209)467-11 19
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