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SECOR '3017 141 Cor FIS d,Su,te 100 INTERNATIONAL i gore oa S E C ® Rancho Cordova CA 95670 ' INCORPORATED 916-661-0400 rFL 916-861 0430 FAx 5 O.0 106 ' February 28, 2003 �� fi,o el j c 0� 1 i Margaret Lagorio FRECOVED ' San Joaquin County Environmental Health Division 304 East Weber Avenue, Third FloorMAR 0 3 2003 '^ ' Stockton, California 95202 ENVIRON�IENT 1�EAlTk� RE CPT and Monitoring Well Installation Assessment Report /SERVICES rr ' Chevron Service Station 9-1452 SECOR Project No 77CH 91452 00 0303 Dear Ms Lagorio , 14 SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Company (Chevron), presents this report for soli and groundwater assessment at the above- a 41 ' referenced Chevron site (Figure 1) Two cone penetration testing (CPT) borings were advanced on either side of the tank pad to assess soil stratigraphy (Figure 2) Adjacent to each CPT boring, a second direct-push borehole was advanced to collect groundwater samples Also, one groundwater monitoring well was drilled and installed to the north''of the tank pad This work was done in ' accordance with SECOR's Site Assessment Report and Work Plan for Further Assessment ("the work plan"), dated June 11, 2002 'p L�v3 a7 SITE BACKGROUND The site is an active service station located at 334 East Main Street in Ripon, California Current site ' facilities include three 12,000-gallon gasoline USTs, two dispenser islands under a common canopy, ° and a station building containing two hydraulic hoists ' SITE ASSESSMENT ACTIVITIES On February 4 and 5, 2003, SECOR supervised Gregg Drilling & Testing, Inc (Gregg) of Martinez, California, as they advanced direct-push borings at two locations (CPT-1 and CPT-2) to assess soil 4; 1 ¢x stratigraphy and collect discrete groundwater samples at the locations shown on Figure 2 Each CPT boring was monitored continuously for soil behavior and pore pressure to Its total depth Each � g ' boring was advanced to approximately 120 feet below ground surface (bgs) Adjacent to each CPT n boring, a second direct-push borehole was advanced to collect depth-discrete groundwater samples F Samples were collected at depths of 66 feet bgs, 91 feet bgs, and 116 feet bgs at CPT-1 and at 75 ' feet bgs, 96 feet bgs, and 111 feet bgs at CPT-2 -J�Y-Ov 4Wde,..- santqlvs " ' loo g ' On February 12, 2003 SECOR supervised Spectrum Drilling and Exploration (Spectrum) of Stockton, � �> California, as they installed one 6-inch diameter groundwater monitoring well (MW-8) to a total depth of approximately 40 feet bgs (Figure 2) t A summary of the field and laboratory procedures followed during these activities is Included as Attachment A The findings of this assessment are summarized below 1 • 1 11Chevron1914521REPORTSICPT and extraction well SA report doc