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J <br /> Water Contaminant Removed from Excavation Pit 1993 <br /> h <br /> C = 3,225 gal x 0 0014 ug/g = 4 5 gallons TPHG <br /> C = 3,225 gal x 0 000020 ug/g = 0 064 gallons Benzene <br /> MTBE was not analyzed for that data set. <br /> Water Estimated Contaminant Mass Remaining <br /> Water (canillar,/aquifer) March, 2000 data assumed estimated in the vicinity of B-1, B-2 <br /> and B-3, area about 20' x 20' x 15' thick using the sum of the three detections <br /> Area 6,000 ft3 x ave , soil density 1001b/ft x 0 3 porosity x 0 0010152 ppm = 182 7 lb <br /> 182 7 lb — 6 8 lb/gal = 26 8 gallons TPHG <br /> If the three detections are averaged,then, <br /> Area 6,000 ft3 x ave , soil density 100 lb/ft x 0 3 porosity x 0 0003384 ppm = 60 9 lb <br /> 60 9 lb — 6 8 lb /gal = 8.9_gallons TPHG <br /> Benzene was not detected in that data set. <br /> MTBE was not detected in that data set. <br /> . These recalculated estimates show that higher quantities of contaminants were removed, <br /> and higher quantities of contaminants remain using the highest observed TPHG values <br /> The calculations for water show that higher quantities of dissolved TPHG contaminants <br /> remain in capillary and aquifer water Wright regrets the calculation and volume errors and <br /> the reviewing agencies should substitute these recalculated numbers in this letter in our <br /> Request for Site Closure Report dated May 9, 2001 <br /> If you have any questions, please call <br /> Sincerely, D �0 <br /> Wright Environmental Services, Inc �S ER ,t <br /> fit° 1252 <br /> John Lynch Chnstopher M Palmer <br /> Principal CEG 1262 Gi���C�1ST <br /> cc Ms Margaret Lagono, San Joaquin Public Health <br /> Page 2 <br />