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1 <br /> IEmcon <br /> 1433 North Market Boulevard •Sacramento California 95834-1943 • (916)928-3300. Fax(916)928-3341 <br /> RECEIVED August 7, 1995 <br /> AUG 0 9 1995 Project 0805-114 04 <br />' Mr Kyle Christie ENVIRONMENTAL HEALTH <br /> ARCO Products Company PERMIT/SERVICES <br />' 2155 South Bascom, Suite 202 <br /> Campbell, California 95008 <br />' Re- Second Quarter 1995 Status Report for ARCO Service Station No 2130, Located at <br /> 7906 North El Dorado Street, Stockton, California <br />' Dear Mr Christie <br /> At the request of ARCO Products Company (ARCO), EMCON has conducted an <br />' environmental investigation and is currently operating a remedial system at the subject site (see <br /> Figure 1) This status report includes information for the second quarter of 1995 on subjective <br /> and laboratory analysis of groundwater samples collected from each monitoring well, <br /> measurements of groundwater elevations in each monitoring well, evaluation of the <br /> groundwater gradient, and performance data for a soil vapor extraction (SVE)/air sparge (AS) <br /> remediation system <br /> BACKGROUND <br />' Environmental work performed at the site has included drilling 20 soil borings on site and <br /> 5 borings off site. Ten vapor extraction wells (VW-1 through VW-10) were installed on <br />' site. Five groundwater monitoring wells were installed on site (MW-1 through MW-5), and <br /> five were installed off site (MW-6 through MW-10). One air sparge well (AS-1) and 3 air <br /> sparge monrtonng points (MS-1 through MS-3) were installed on site During construction <br /> of well MW-9, cement slurry was accidentally introduced into the slotted screen The well <br /> was therefore destroyed, and another boring was drilled near well MW-9 and converted to <br /> a monitoring well (MW-10) Well locations are shown on Figure 2 <br /> During October 1993, in association with the replacement of the underground storage <br /> �' g <br /> tanks and product delivery tunes, RESNA Industries (RESNA) of Rancho Cordova, <br />' California, observed Triangle, Inc , (Triangle) of Sacramento, California, excavate trenches <br /> and install horizontal piping for use during site remediation <br /> In June 1994, RESNA prepared and submitted a Problem Assessment Report (PAR) and a <br /> Final Remediation Plan (FRP) to the county and state regulatory agencies The reports indicated <br /> SAGN\pj0Q80M8051140 4cs.95 pas i <br />