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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 SPA METHODS: 8015 MODIFIED AND 8020 WITH 5030 EXTRACTION DOHS DONS LOCATION SAMPLE DATE DEPTH TOTAL PETROIJM HYDROCARBONS BTEX AS 1803 IDM SAMPLED SAMPLED GASOLINE KEROSINE DIESEL OILS BENZENE TOLUENE L-M XYLENES EDB TEL IN FEET RANGE RANGE RANGE RANGE BENZENE BELOW SURFACE IN PPM IN PFM IN PPM IN PPM IN PPM IN PPM IN PPM IN PPM IN PPM IN PPM TANK TP1-A 09/29/89 15 100 TOTAL 36 30 2 1 77 <3 0 <5 0 EXCAVATION TP1-0 17 1300 TOTAL 540 510 42 890 Cl 0 <5 0 TP2-A 17 100 TOTAL 30 24 1 8 58 <3 0 <5 0 TP2-B 18 1500 TOTAL 610 580 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 2004 180 3400 <3 0 <5 0 TP4-A 17 2600 TOTAL 1150 1000 69 1800 <3 0 <5 0 TP4-B 16 100 TOTAL 41 37 2 4 78 <3 0 <5 0 TP5-A 15 5 410 TOTAL CO 005 <0 01 <0 01 <0 02 <3 0 <5 0 TP5-B 16 1200 TOTAL 580 550 48 990 <3 0 <5 0 OVEREXCAVATED TO 25-26 FOOT DEPTH AND RESAMPLED LEAD OVER EX-1 06/26/90 25 <10 <10 00 <10 <0 005 40 005 <0 005 CO 015 <10 1 EXCAVATION EX-2 2S <10 <10 <30 <10 <0 005 O 05 <0 005 0 14 <10 <1 0 OF TANK EX-3 25 <10 <10 <10 <10 CO 005 <0 005 <0 005 <0 015 <10 1 AREA EX-4 25 <10 <10 c10 410 <0 005 <0 005 <0 005 <0 015 <10 1 EX-5 26 <10 <10 <10 Cl0 <0 005 0 01 0 985 0 085 <10 1 EX-A 26 CIO <10 410 <10 <0 005 <0 005 <0 005 0 05 NR NR EX-8 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 41 <1 <0 005 <0 005 CO 005 <0 015 NR NR WELL WITHIN EX-37 37 2 Cl <1 Cl <0 005 <0 005 <0 005 <0 015 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 CO 005 <0 01 <0 01 CO 02 NR NR PL-4 4 1700 AS GASOLINE 650 530 44 1100 NR NR PL-S 5 <10 AS GASOLINE <0 005 <0 01 <0 01 <0 02 NR NR OVEREXCAVATZ PL1(EXC1A) 08/22/90 13 <10 -10 <10 <10 <O 005 <O 005 CO 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 40 005 <0 005 <0 005 <0 015 NR NR PL2(EXC28) 13 <10 <10 <10 <10 <0 005 0 01 0 04 40 015 NR NR PL1(EX1-PB)09/06/90 20 660 <10 <10 <10 c0 005 0 78 0 57 5 9 NR NR PL4(EK3-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 VAPOR P1-30 10/08/90 30 2 <1 <1 Cl 0 62 0 26 Co 005 0 02 NR NR •EXTRACTION P1-40 40 2 <1 Cl <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 57