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leofogccal hcluucs t" Page 3 <br /> Additional Investigation Work Plan <br /> Cardoza(Matti St) <br /> Project No 662 2 <br /> October 8,2001 <br /> ' Because every soil sample collected will not be submitted for laboratory analysts, a <br /> screening process will be used to gather additional information through field observation <br /> ' noting sediment type, especially grain size and clay content, moisture content, visible <br /> evidence of contamination, i e , color change due to reduction of iron or discoloration from <br /> hydrocarbons and other pollutants, and any readings above background levels on an organic <br /> vapor meter (OVM) The OVM is a field portable photo ionization detector that uses a 10 0 <br /> ' eV lamp to detect compounds with ionization potential below 10 0 eV (hydrocarbon range) <br /> 2.3 Soil Laboratory Analyses <br /> ' Up to 12 soil samples will be submitted to California Laboratory Services (State Certified <br /> Laboiatory #1233) for analysis for <br /> ' • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 602 <br /> • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m) <br /> + Gasoline oxygenates (MTBE, DIPE, ETBE, TAME & TBA) by EPA method 8260 <br /> ' The detection limits for these compounds are listed below A Chain of Custody will be <br /> completed for all samples collected and tracked to ensure sample integrity <br /> ' Detection Limits BTEX I Oxygenates - <br /> oi (µg/Kg - <br /> 2.4 Hydi ogeologic & Geophysical Parameter Testing <br /> It is proposed that additional soil samples from four representative geologic units be tested <br /> t for the following geophysical parameters <br /> + Hydraulic conductivity - by Constant-Head Test <br /> • Porosity and dry bulk density by ASTM-2434 <br /> • Penrneabihty by ASTM D-2434 <br /> • Organic carbon content by ASTM D-2974 <br /> This data will be used in the fate and transport calculations as described below <br /> 2.5 Monitoring Well Installation <br /> ' The construction of the water table wells and deep well is approximately the same as the <br /> other wells currently on site The construction details are outlined in the table below <br /> ' Well No. Dia./TD Screen Slot Sand PackTrans. Grout ea <br /> Seal <br /> �151_2sand-T3=3 ---TT--I1_I- -sur ace <br /> T4W-_F0T___T75_5— '- 12 sand_ - 5 44 -su��-rface <br /> - _G3 '753' 50-551 sand 4$- -6- -sur ace <br /> - I <br /> "— #12 sand - 6-45' <br /> 755 I _ 2—s and-4$-5 - 4b'--su_-r- a� <br /> -1 5 _ -0" __#T2 sand_48=55' _-4$'_ --fib'-suuic a� <br /> 1 <br />