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' Groundwater Investigation,Monitor Well Destruction and Installation,and Interim Remediation Pump Test Report Boyett Petroleum,419 S.Main SL,Manteca,CA ' January 30,2004 Page 13 that were sealed at the ends with Teflon® sheeting, capped, and labeled The samples were stored in a cooler chilled with Blue Icer) and delivered under chain-of-custody procedures to Argon for analyses. 4.3 LABORATORY ANALYSES ' Light soil samples collected from the well borings were analyzed for: TPH-G and BTEX by EPA Method 8015B/8021B; gasoline oxygenates/additives (MTBE, TBA, DIPE, ETBE, TAME, 1,2-DCA, and EDB) by EPA Method 826013; and total lead by EPA Method 7420. Soil sample laboratory results are provided ' in Table 5, below. Table 5 Soil Sam le Laboratory Anal tical Results October 30, 2003) ' Constituent: Benzene Toluene Ethyl Total TPH-G MTBE Total Lead tither Benzene Xylenes Oxygenates Detection Limit: 0.005 0.005 0.005 0.010 1.0 10,0 5.0 0.005---0.050 ' Sample 1D mg/kg mgfkg mg/kg mg/kg mg/kg mg/kg rngkg m€lks' 376IB-MW4R-15 <0.005 <0.005 <0.005 <0.010 <1.0 <0.005 <5.0 <0.005-0.050 ' 3761B-MW4R-25 <0.005 <0.005 <0.005 <0.010 <L0 <0.005 6.5 <0.005-0.050 3761B-MW10-15 <0.005 <0,005 <0.005 <0.010 <1.0 <0.005 7.1 <0.005-0.050 3761B-MW10-25 <0.005 <0.005 <0.005 <0.010 Q.0 <0.005 <5.0 <0.005-0.050 ' 376IB-MW11-t5 <0.005 <0.005 <0.005 <0.010 <1.0 <0.005 6.7 <0.005-0.050 3761E-MWI -26 <0.005 <0.005 <0.005 <0.010 <1.0 0.053 7.3 <0.005-0.050 376IB-EW-20 <0,005 <0.005 <0.005 <0.010 <1.0 <0.005 <5.0 <0.005-0.050 ' 3761B-EW-39 <0.005 j <0,005 <0.005 <0.010 <1.0 0.024 <5.0 <0.005-0.050 *=See laboratory reports in Appendix F for actual laboratory reported detection limits. Other Oxygenates=MTBE,TBA,DIPE,ETBE,TAME,1,2-DCA,and EDB Unit Conversions: mg/kg parts= milligrams per kilogram=parts per million(ppm) Laboratory analytical results for the soil samples indicate that petroleum hydrocarbon constituents, with ' the exception of MTBE, were not detected at or above laboratory reported detection limits. MTBE was detected in the soil samples collected from MW-11 and EW-1 at depths of 26 and 39 feet bgs, respectively. However, these samples were collected from saturated soils; MTBE was not detected in any ' soil samples collected above the water table. 4.4 WELL CASING SURVEY ' On November 5, 2003, monitoring wells MW-4R, MW-10, MW-11, and EW-1 were surveyed to determine the location and elevation of the well collars relative to a NAD83 benchmark datum (Benchmark No. HS4486). X and Y survey coordinates were collected with a Trimble 5700 centimeter- level RTK Global Positioning System (GPS) and referenced to NAD83 datum by post-processing the base station against the Condor Stockton (CNDR) CORS station. Elevations were determined by TOPCON AT-63 Autolevel from the base station and referenced to NAVD88 datum using the base station elevation obtained by a 3-minute RTK occupation of NGS Benchmark HS4486, elevation 35.03 feet. The Well collars were surveyed with a vertical accuracy of 0.01 foot and a horizontal accuracy of 0.05 foot. The measuring point for water-level measurements was marked on each well collar. Well collar elevations are shown in Table 6 on the fnllowina nnaP A -A .,, fl,o ' .. J r--O-J -LS-..... - --. �,r t.v.,...,.. a, u..0 u.♦ ..v �l.V1VE'jl\. boring logs included in Appendix B. The well survey data has been submitted to the State Water • Resources Control Board in Electronic Deliverable Format(EDF) as required by AB 2886. 1 `s ' �� CONDOR