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• <br /> QUARTERLY SUMMARY REPORT <br /> 2nd QTR- 2000 <br /> (Apr - Jun ) <br /> TOSCO (76) SERVICE STATION 46981 <br /> 4707 Pacific Ave <br /> Stockton, CA <br /> CITY/COUNTY IDP Stockton <br /> COUNTY San Joaquin <br /> BACKGROUND The USTs were replaced in 1988 To date 16 onsite and 5 offsite borings have been drilled and 13 <br /> groundwater monitoring wells,one pumping test well,and six vapor extraction wells instal led 1,600 cubic yards of soil were <br /> excavated and aerated Groundwater monitoring began in February 1990 Vapor Extraction Test was performed m March <br /> 1992 A pump was test preformed in August 1992 A Vapor Extraction System(VES)was installed and operation initiated <br /> inSeptember1994 Abandoned wells MW-3,MW-10,MW-12,and MW-13 to facilitate re-construction ofstieetintersection <br /> Submitted work plan to install one offsite groundwater monitoring well and drill one soil boring in September 1997 <br /> Submitted Work Plan Addendum(dated 2117199)for additional borings/wells Submitted additional subsurface investigation <br /> (borings/wells) report date 11/15/99 <br /> RECENT QUARTER ACTIVITIES Monitored and sampled groundwater monitoring wells USTs and product piping <br /> lMemoved and samples collected in April 2000 Approximately 100 cy of soil was over-excavated from the product <br /> piping/dispenser areas VES was not pulsed during the quarter due to station demolition activities (electrical service <br /> rerouted) <br /> NEXT QUARTER ACTIVITIES Will pulse VES starting in July and continue monthly Monitor and sample groundwater <br /> monitoring wells Submit UST removal report <br /> CHARACTERIZATION/REMEDJAL STATUS <br /> Soil contamination delineatedv ey s <br /> Dissolved ground water delineated? yes <br /> Free product dehneated9 n/a <br /> Amount of groundwater contaminant recovered 0 (gal) <br /> this quarter <br /> Soil remediation in progress9 yes <br /> anticipated start? 9194 <br /> anticipated completion9 unknown' <br /> Dissolved/free product remediation na <br /> in progress9 <br /> anticipated start? <br /> anticipated completion? <br /> ' Approximately 14,747 pounds of TPHg and 183 pounds of benzene have been extracted to date <br /> • <br /> CONSULTANT/CONTRACTOR Gentler-R an Inc <br /> 140124 01 <br /> #6981 <br /> r <br />