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Geological Technics Inc Page 4 ' Soil and Groundwater Investigation Work Plan Cardoza(Main St) . Project No 662 2 January 17,2003 ' • Benzene toluene eth lbenzene and xylene BTEX b EPA method 602 > Y Y ( ) Y , • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m) • Gasoline oxygenates (MTBE, DIPE, ETBE, TAME & TBA) by EPA method 8260 Tv c1�Jc k;Z VAw s'U 0 The detection limits for these compounds are listed below A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity etectio Oxygenates I TPH-U ' —Soil µg Kg — Hydrogeologic & Geophysical Parameter Testing ' It is proposed that additional soil samples from foui representative geologic units be tested for the following geophysical parameters • Hydraulic conductivity -by Constant-Head Test Nva H..t Cdl t ".'1 c.{a SuuRL ' • Porosity and dry bulk density by ASTM-2434 "r') Vt W ad��. f� ¢ ¢ IL • Permeability by ASTM D-2434 R dxt lei vett E.X • Organic carbon content by ASTM D-2974 ' This data will be obtained for use in the fate and transport calculations 3.1.3 Water Sampling Water sample depths will be targeted to complete a site conceptual model illustrating the lateral and vertical extent of the groundwater plume at the site Gregg will utilize a hydropunch type sampler to obtain samples at depths to be determined in the field The sampler is attached to the end of the drill rods and then advanced to the targeted depth When the targeted depth is achieved, the rods are retracted 12 — 18 inches to allow a ' screened portion of the rods to be exposed and water to enter A water sample will then be obtained from inside the rod column by lowering a small diameter bailer into the rods Water samples will then be transferred from the bailer to VOA container for transport to the ' laboratory Care will be taken to minimize sample agitation from the initial filling of the bailer to the transfer of the sample to the VOA vial A description and schematic of the process is included in Appendix B ' 3 1.4 Water Sample Laboratory Analyses Up to 4 groundwater samples from each borehole will be submitted to Sherwood Labs (State Certified Laboi atory #1400) for analysis for • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 602/5030 • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m) l • Gasoline oxygenates (MTBE, DIPE, ETBE, TAME & TBA) by EPA method 8260 ff 1,Z-r)tA p.J EDL' The detection limits for these compounds are listed below A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity etection imits BTEX Oxy's - -Water µg - - 50