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r <br /> CHRONOLOGY <br /> JC Trucking <br /> 9207 Aurora Street <br /> Stockton, CA 95206 <br /> 05/04/92 Four underground storage tanks removed this date under San Joaquin County <br /> Environmental Health Department (EHD) permit and inspection. Soil samples for <br /> laboratory analysis were collected from beneath the tanks and from the soil <br /> stockpile. Analytical results were positive for total petroleum hydrocarbons (TPH) <br /> as gasoline and diesel, benzene, toluene ethylbenzene and xylenes (BTEX). <br /> 08/18/92 Unauthorized Release Report #92-U82 and Notification of Hazardous Waste <br /> Discharge #92-164 submitted this date. <br /> 03/07/94 EHD correspondence sent this date informing the responsible party that further <br /> investigation of the contamination at the site is needed. <br /> 11/21/95 Site placed into the Local Oversight Program. <br /> 11/29/95 'Notice of Reimbursement' and 'Site Letter' sent this date to John Cervantes. <br /> 07/22/97 'Letter of Commitment' issued this date by the State Water Resources Control <br /> Board Cleanup Fund. <br /> 08/18/97 Geoprobe soil borings, B-1 thru B-9, were advanced beginning this date. Soil and <br /> grab groundwater samples were collected for laboratory analysis; see <br /> 'Preliminary Investigation and Evaluation Report' dated January 5, 1998, <br /> submitted by Aqua Geosciences, Inc. Analytical results from the investigation <br /> indicated the groundwater was impacted with petroleum hydrocarbons, and that <br /> the plume was not defined. <br /> 03/23/99 Six shallow groundwater monitoring wells, MW-1 thru MW-6, and one pilot boring <br /> B-1, advanced to approximately 70-feet below surface grade (bsg), were installed <br /> beginning this date; see 'Site Assessment Report' dated July 12, 1999, submitted <br /> by JJW Geosciences (JJW). <br /> 04/30/99 Routine quarterly groundwater monitoring and reporting was initiated this date. <br /> 08/30/99 Two depth-discrete monitoring wells, MW-7 & MW-8 were installed this date to <br /> total depth 110 feet bsg; see 'Groundwater Monitoring Well Installation Report' <br /> dated November 30, 1999, submitted by JJW. Groundwater samples from both <br /> wells have contamination; MW-7 appears to be compromised with grout. <br /> 04/06/01 Work began this date to install six Strata Probe soil borings, WSP-1 through <br /> WSP-6; two soil borings with simulprobe water samples, SB-2 and MW-11; two <br /> shallow groundwater monitoring wells (MW-9 and MW-10), two deep <br /> groundwater monitoring wells, MW-11 and MW-12; and destruction and <br /> replacement of MW-7. See "Site Assessment Report" dated November 14, 2001 <br /> submitted by JJW. <br />