Laserfiche WebLink
CALIFORNIA GEOPH%ICAL GROUP, INC. <br /> P.O. Box 691, Poway, CA 92074 Tei: (619) 486-1323 <br /> 1 of 8 Pages FAX: (619) 6-4 36 <br /> WORK PLAN <br /> FOR PITUY11 <br /> OASCO SERVICE STATION <br /> 749 E CHARTER WAY <br /> STOCKTON, CALIFORNIA .SUN 11, 5 199 i <br /> March 18, 1993 <br /> SITE HISTORY ENV1f20NM1 NTAL HEALTH <br /> PERMI I SERVICES <br /> On November 14, 1989 three underground tanks were removed from <br /> the site in accordance with the Tri-Regional regulations <br /> 'resting of the soil samples taken around the old tanks <br /> indicated the site had been contaminated with gasoline <br /> The excavation site was backfilled with the original soil plus <br /> soil from a new excavation The site was then remodeled and <br /> placed back in service <br /> A work plan for assessing the contamination of the site was <br /> sent to the the San Joaquin Health Department of Dec. 29, 1989 <br /> The plan was accepted and a special well permit was issued on <br /> Jan 19, 1990 <br /> Drilling and sampling according to the work plan began on Jan <br /> 22, and finished on Jan 26, 1990. A Site Assessment report was <br /> submitted to San Joaquin County Health an February 9, 1990 On <br /> October 1 , 1990 we beganquarterly sampling, by that time the <br /> water table had dropped below the bottom of the wells and has <br /> remained so to this time <br /> In April 1992, we dralled three additional wells at the site <br /> into the water table The results of this work were reported <br /> in our Site Assessment of April 30, 1992 <br /> SCOPE OF WORK <br /> The previous borings have confirmed that the unsaturated zone <br /> is clean beyond wells 2, 3 and 6 All of the other wells have <br /> soil contamination All of the well water tested has been <br /> contaminated This drilling program is designed to define for <br /> the most part the zones of contamination in both the soil and <br /> the water. <br /> Attached you will find Fig . 1 showing the locations of boring <br /> L-1 and wells BW-7 and BW-8 Boring B-1 will be drilled to <br /> this capillary fringe soil testing and logging will take place <br /> with cores obtained every 5 feet. The purpose of this well is <br /> to define the soil contamination south of the old tank pit. <br /> Well BW--7 is located as far up gradient as we can get and <br /> remain on our property. We do not expect to find any soil <br /> contamination in this well and we expect the groundwater to be <br /> clean WP hope this well will define the western limits of <br /> groundwater and capillary fringe contamination <br />