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AOC Work Plans One soil sample below the former Penta Tank detected formaldehyde below the residential PRG, and it is our opinion that this detection does not warrant additional investigation.All other soil sample results from the tank area were below reporting limits for PCP,phei tols, SVOCs,and formaldehyde and these compounds were also absence in a groundwater sai nple collected from the area. 4.7.2 Underground Storage Tanks Site Summary A total of 15 USTs had been identified at the Site at the time of the Kleinfe Ider Workplan(Plate 4.1.2). Some of the USTs were later determined to be exempt from stateregulations as there were identified as sumps. Site USTs were identified by the Site Code number( 882)and tank number (0001 through 0014). In November 2000,AGE interviewed Ms. Carol Oz of the PHS-EHD reg ding the status of the USTs formerly located on the subject site. According to Ms. Oz,tank Nur ibers 0007,0008,and 00014(discussed below)were removed in November 1987 and no contain nation was encountered in soil underlying the tanks. UST Numbers 0001,0002, and 0005 were underlain by hydrocarbon- impacted soil,which was remediated as described below. Notes of the coi versation do not include UST Number 0003,but Ms. Oz stated that there were no outstanding issue related to any of the USTs and that the PHS-EHD had no open UST cases on the site other than the final groundwater monitoring events for tank numbers 0002 and 0005,as described below. The RWQCB indicated at a July 31,2001,meeting with AGE personnel t t the former USTs on the site pose no concerns at this point in time. An official closure letter was issued only for UST Number 18822 (also cited as UST 18820001). Closure letters were not is ued for the other former USTs due to lack of submission of various documents and the RWQCB i dicated that such letters Draft KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 1s September 28,2005