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TABLE 4 TANK EXCAVATION, PRODUCT TRENCHES, AND SOIL BORING SOIL SAMPLES FORMER REGAL STATION 604, 1448 N EL DORADO STREET, STOCKTON, CALIFORNIA EPA METHODS 8015 MODIFIED AND 8020 WITH 5030 EXTRACTION DOHS DOHS LOCATION SAMPLE DATE DEPTH TOTAL PETROLEUM HYDROCARBONS BTEX AB 1803 ID# SAMPLED SAMPLED GASOLINE KEROSINE DIESEL OILS BENZENE TOLUENE ETHY XYLENES EDB TEL IN FEET RANGE RANGE RANGE RANGE BENZENE BELOW SURFACE IN PPM IN PPM IN PPM IN PPM IN PPM IN PPM IN PPM IN PPM IN PPM IN PPM TANK TPI-A 09/29/89 15 100 TOTAL 36 30 2 1 77 <3 0 <5 0 EXCAVATION TP1-B 17 1300 TOTAL 540 510 42 690 <3 0 <5 0 TP2-A 17 100 TOTAL 30 24 1 8 56 <3 0 <5 0 TP2-B 18 1500 TOTAL 610 560 44 1000 <3 0 <5 0 TP3-A 18 55 TOTAL 21 17 1 1 39 <3 0 <5 0 TP3-B 17 4500 TOTAL 2300 2000 180 3400 <3 0 <5 0 TP4-A 17 2600 TOTAL 1150 1000 89 1600 <3 0 <5 0 TP4-B 16 100 TOTAL 41 37 2 4 7B <3 0 <5 0 TP5-A 15 5 <10 TOTAL <O 005 <0 01 <0 O1 <0 02 <3 0 <5 C TP5-B 16 1200 TOTAL 580 550 4B 990 <3 0 <5 0 OVEREXCAVATED TO 25-26 FOOT DEPTH AND RESAMPLED LEAD OVER EX-1 06/26/90 25 <10 <10 <10 <10 <O 005 <0 005 <0 005 <O 015 <10 1 EXCAVATION EX-2 25 <10 <10 <10 <10 <0 005 0 05 <0 005 0 14 <10 <1 0 OF TANK EX-3 25 <10 <10 <10 <10 <0 005 <O 005 <0 CCS <0 C15 <10 1 AREA EX-4 25 <10 <10 <10 <10 <0 005 <O 005 <0 005 <0 015 <10 1 EX-5 26 <10 <ID <10 <10 <O OD5 0 01 0 085 0 085 <10 1 EX-A 26 <10 <10 <10 <10 <0 005 <0 OD5 <0 005 0 05 NR NR EX-B 26 <10 <10 <10 <10 <0 005 <0 005 <0 005 0 22 NR NR BACKFILLED EXCAVATION WITH 1/4" PEA GRAVEL TO THE 12 FOOT DEPTH AND INSTALLED VAPOR EXTRACTION WELL VAPOR EXTRAC EX-30 10/09/90 30 2 <1 <1 <1 c0 005 <0 005 <0 005 <0 C15 NR NR WELL WITHIN EX-37 37 2 <1 <1 <1 <0 005 <0 005 <0 005 <O 015 NR NR 5 OF EX-5 -------------------------------------------------------------------------- ----------------------------- -------------------------- PRODUCT LINE PL-1 10/05/89 4 2500 AS GASOLINE 900 750 60 1300 NR NR TRENCHES PL-2 3 5 1000 AS GASOLINE 350 260 21 750 NR NR PL-3 3 5 <10 AS GASOLINE SO 005 <0 OS <0 Cl <0 C2 NR NR PL-4 4 1700 AS GASOLINE 650 530 44 1100 NR NR PL-5 5 <10 AS GASOLINE <0 C05 <O O1 <0 01 <0 02 NR NR OVEREXCAVATE PL1(EXC1A) 08/22/90 13 <10 <10 <10 <10 <0 005 <0 005 <0 005 <0 015 NR NR PUMP ISLANDS PL1(EXC1B) 13 1560 <10 <10 <10 1 31 13 110 NR NR PL2(EXC2A) 13 <10 10 <10 <10 <0 005 <O 005 <0 005 <0 015 NR NR PL24EXC2B) 13 <10 <10 <10 <10 <0 005 0 01 0 04 <0 015 NR NR PL1(EX1-PB)09/06/90 20 660 <10 <10 <10 <0 005 0 78 0 57 5 9 NR NR PL4(EX3-PA) 20 8000 <10 75 <10 15 120 60 260 NR NR BACKFILLED EXCAVATIONS WITH 1/4" PEA AND INSTALLED VAPOR RECOVERY WELLS P1 AND P3 APOR P1-30 10/08/90 30 2 <1 <1 <1 0 62 0 26 <0 005 0 02 NR NR i XTRACTION P1-40 40 2 <1 <1 <1 0 57 0 13 <0 005 <0 015 NR NR DESTROY VAPOR EXTRACTION WELL P1 ON 7/21/92 BY OVERDRILLING PRESSURE GROUTED WITH 350 GALLONS NEAT CEMENT 20