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/Og"�gg SMCOn Associates <br />' 1433 North Market Boulevard • Sacramento Cakfornia 95834-1943 • (916)928-3304• Fax(916)928-3341 <br /> n� <br />' September 12 1994 <br /> Project 0805-111 01 <br /> Mr Chuck Carmel S E P 13 1994 <br />' ARCO Products Company <br /> P O Box 5811 ENVIRONMENTAL HEALTH <br /> San Mateo, California 94402 PERMF/SERVICES <br />' Re Second Quarter 1994 Status Report for ARCO Service Station No 216 <br /> p 8 at <br /> 441 Charter Way, Stockton California <br />' Dear Mr Carmel <br />' At the request of ARCO Products Company (ARCO), EMCON Associates (EMCON) is <br /> conducting an environmental investigation at the subject site (see Figure 1) We have <br />' prepared this status report based on the work conducted during the second quarter I994, <br /> which included groundwater monitoring and sampling <br /> GROUNDWATER MONITORING: SECOND QUARTER 1994 <br /> Groundwater Technology, Inc., (GTI) of Concord, California, was contracted by ARCO <br />' to conduct the field work at the Site, GTI subsequently forwarded their field notes and the <br /> laboratory reports to EMCON Field work included measuring depths to water and <br /> collecting groundwater tramples for subjective and laboratory analyses EMCON used <br />' these data to evaluate the direction and gradient of groundwater flow beneath the site <br /> On June 29 1994, a technician trom GTI measured depths to water and collected <br />' groundwater samples from wells MW-I through MW-7 for subjective and laboratory <br /> analyses Floating product or product sheen was not noted in samples tram the wells (see <br /> Table 1) <br />' The wellhead elevations of the site monitoring wells were previously Y <br /> surveyed b Tom O <br /> Y <br /> Morrow Inc The surveyed elevations and the depth-to-groundwater measurements, <br />' summarized in Table 1, were used to evaluate the potentiometnc surface beneath the site <br /> The dtrec.tion of groundwater flow on June 29, 1994, was northeast with a hydraulic <br />' gradient of {1 003 as shown on Figure 2 The gradient is consistent with pervious data <br /> Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHG) <br />' using Environmental Protection Agency (EPA) Methods 5030/8015 and benzene toluene, <br /> ethylbenzene and total xylene (BTEX) using EPA Methods 5030/8020 presci abed by the <br /> i <br /> QAC/pjLN1805ND8051 i 10 Id 94 pvN 4 <br /> 1 <br />