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I <br /> CHRONOLOGY <br /> PAIGES TOWING <br /> 1807 DOUGLAS ROAD,STOCKTON CA 95205 <br /> 1215189 Collected soil samples from six soil borings(two vertical and four angle)in the area of the existing { <br /> 10,000 gallon regular/unleaded underground fuel storage tank(UST)(State ID 39-1078-01),and <br /> the 10,000 gallon regular/diesel fuel UST(State ID 39-1078-02)at the site. <br /> 01/30/90 San Joaquin County Public Health Services Environmental Health Division(PHS/EHD)received <br /> analytical results of the soil samples. Results were 150 parts per billion of benzene at 23 feet <br /> below'surface grade(bsg)and 150 parts per million of toluene at 5 feet bsg. (The results cited here <br /> are from in a PHS/EHD letter.) Filed Unauthorized Release Report(90-U18)and Prop 65 were <br /> filed. <br /> 02/26/90 Entered site into Local Program Oversight LOP <br /> g �' (LOP) i. <br /> 04/05/90 Responsible party was advised in a letter that further investigation is required. <br /> 11/08/91 Reviewed latest ownership information in the assessor's list. Both Jim Paige and Bill Watkins <br /> (current property owner)were named as responsible parties. <br /> 10/27/95 Mailed to RP a"Notice of Reimbursement"was mailed to the responsible parties requesting <br /> additional work to delineate the contamination at the site. <br /> 01/23/96 Advanced 6 soil borings(B 1 to B6)to 30 feet below surface grade(bsg). Depth of the <br /> groundwater was initially measured at 27 feet bsg,and has since to 14 feet bsg by 2001. Historical <br /> low groundwater(1997)in the area was about 45 feet bsg. <br /> 03/06/96 Received results of the soil boring samples. Analytical results of the soil sample from B-1 at 25 <br /> feet bsg were 220 mg/kg of total petroleum hydrocarbon as gasoline(TPH-g)were found in. <br /> Analytical results of the grab groundwater from B3 were 5,800 ug/l of TPH-g,4,000µg/1 of TPH- <br /> diesel, 160µg/l of benzene,and 570µg11 of xylenes were found in. Analytical results of the grab <br /> groundwater from B6 were 200µg/l of TPH-diesel. <br /> 12/19/98 Three soil samples were collected beneath,former product piping and dispenser. { <br /> li <br /> 01/15/99 Both'UST and product piping were removed from the site and transported to West Coast i <br /> Equipment in Turlock,California. 4 soil samples were collected beneath the UST,and six soil <br /> samples were collected from the stockpile. Results of the soil sample from product pipe No. 1 were <br /> 0.14 mg/kg of tert-butanol(TBA). <br /> 04/08/99 Four monitoring wells(MW-1 through MW-4)with screen section between 10 feet bsg and 30 feet <br /> bsg set were installed at the site. <br /> 1999 to 2000 6 quarters of groundwater samplings were conducted at the site. Groundwater results were not <br /> detect for MW-1 to MW-4. However,low concentrations of TPH-g and TPH-d have been detected <br /> in MW-3 for the past two quarters. Concentrations were 260 4g/i and 330µg11 for TPH-g and 350 <br /> and 450µg/l for TPH-d. Highest concentration of aromatic hydrocarbons ever recorded was 0.82 <br /> µg11 of toluene. Highest concentration of methyl tertiary butyl ether(MTBE)was 43 pg/l. TPH g <br /> results were annotated-as having sample peaks within the heavier gasoline compound range, <br /> perhaps`indicating aged gasoline. <br /> 06/08/00 Reported no receptor wells found within 2000 feet of the site in a well survey. <br /> 02/05/01 Calculated remaining mass of diesel in soil. Mass was not calculated for groundwater since the <br /> results were consistently not detect or low. <br /> 04/17/01 Received Certified list of record fee title owners e <br /> 05/08/01 Submitted site to CVRWQCB for concurrence of closure. <br /> 14 <br /> I <br /> Ik+ <br />