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Emcon <br /> 1433 North Me,cet Boulevard •Sacramento California 95834-1943 • (916)928-3300• Fox(916)928-3341 <br /> wp <br /> May 15, 1995Q <br /> Project 0805-114 04 �G <br /> CIS <br /> ,4 <br /> Mr Kyle Chnsue <br /> ARCO Products Companv <br /> 2155 South Bascom, Suite 202 ' <br /> Campbell, California 95008 Q' <br /> Re First Quarter 1995 Status Report for ARCO Products Company Service Station <br /> No 2130 X7906 North El Dorado Street, Stockton, California <br /> Dear Mr Chns✓tie <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 uiformation for the first quarter of 1995 on subjective <br /> analysis of water samples from each monitoring well, the thickness of floating product in the <br />. monitoring wells. measurements of groundwater elevations in each monitoring well, evaluation <br /> of the groundwater gradient, collection and analysis of groundwater samples, and performance <br /> data for an air sparge remediation system <br /> BACKGROUND <br /> Environmental work perrormed at the site has included dnUmg 20 on-site and 5 off-site soil <br /> borings Ten vapor extraction wells (VW-1 through VW-10) were drilled on site. Five <br /> groundwater moratoring wells were dnlled on site (MW-1 through MW-5), and five were <br /> drilled off site (MW-6 through MW-10) One air sparge well (AS-1) and three air sparge <br /> monitoring points (MS-1 through MS-3) were dnlled on site. During construction of <br /> monitoring well MW-9, cement slurry was accidentally introduced into the slotted screen. <br /> Therefore, the well was destroyed and another boring was drilled near monitoring well MW-9 <br /> and converted to a monitoring well (MW-10). Well locations are shown on Figure : Residual <br /> hydrocarbons were detected in soil to 60 feet below ground surface at the groundwater <br /> interface near the existing tanks, however, gasoline hydrocarbons were not detected in the off- <br /> site soil borings. Dissolved hydrocarbons were detected at concentrations above maxtrnum <br /> contaminant levels (MCL;) in the five on-Site and two off-site groundwater monitoring wells, <br /> but concentrations of dissolved hydrocarbons did not exceed MCLS in samples from wells <br /> MW-8 and MW-10, <br /> ti Ac�N nm�nRrls�nRns a sn ahs vs� � <br />