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CHRONOLOGY <br /> Former BP Service Station No. 11 193 <br /> 3202 West Hammer Lane <br /> Stockton, California 95209 <br /> 04/30/87 Date when one 1,000-gallon waste oil underground storage tank (UST) was <br /> removed from the southwestern portion of the site. <br /> 05/27/87 Date of Soil Sampling Report submitted by Kaprealian Engineering, Inc. that <br /> reported gravimetric waste oil as petroleum oil at 55 milligrams per kilogram <br /> (mglkg) in the one soil sample collected from the base of the waste oil UST <br /> excavation at approximately 10 feet below surface grade (bsg). <br /> 10/13/92 Date of Work Plan for Evaluation of Soil and Groundwater submitted by RESNA <br /> Industries, Inc., proposing the advancement of four soil borings and conversion <br /> of the borings to four monitoring wells if groundwater was encountered above 45 <br /> feet bsg. <br /> 12103-10192 Dates when monitoring wells MW-1 through MW-4 were installed onsite. <br /> 02/12/93 Date of Preliminary Site Assessment Report submitted by RESNA Industries, Inc. <br /> that described the installation of four monitoring wells and reported the soil and <br /> groundwater analytical results from the well installation and included a sensitive <br /> receptor survey that indicated one California Department of Transportation <br /> (Caltrans) irrigation well was located approximately 300 feet from the site. <br /> Report available on Questys, file XR0002966. <br /> 03/22/93 Date the EHD filed Unauthorized Release Form (URF) No. 93-U14 and <br /> Notification of Hazardous Waste Discharge No. 93-044 after laboratory analytical <br /> results revealed petroleum hydrocarbon contamination in soil and groundwater <br /> samples collected during the preliminary environmental site assessment. <br /> 04/05/93 Date of letter from the EHD informing the responsible party of his/her <br /> responsibility to perform corrective action, and the placement of the site into the <br /> Local Oversight Program (LOP). <br /> 04/28/93 Date of Work Plan for Supplemental Site Investigation submitted by Alisto <br /> Engineering Group, proposing the installation of one on-site and two off-site <br /> groundwater monitoring wells. <br /> 03/30/94 Date when monitoring well MW-5 was installed on-site, and MW-6 and MW-7 <br /> were installed off-site. <br /> 06/22/94 Date of Supplemental Site Investigation Report submitted by Alisto Engineering <br /> Group, which reported soil lithology, and groundwater and soil analytical results <br /> from the installation of MW-5 through MW-7. Report available on Questys, file <br /> XR0002962. <br />