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CLOSURE SUMMARY REPORT - - December 1995 RECEIVED Clark Well, Ii ic. 2424 East Charter Way, Sto kton, California JAN 21 191; �- ENVIRONMENTAL HEALTH PERMIT/SERVICES- . 1.0. INTRODUCTION ' In accordance with a request from Mr. Mike Clark of Clark Well, Inc. (CWI),- Advanced GeoEn*onme.ntal, Inc. (AGE) has prepared this Closure SumrnaryyReport (CSR) for the property located at 2024 East Charter Way in Stockton, California. The general location of the site,is depicted in Figure 1 -Location Map. A layout of the site is illust rated in.Figure 2.-:Site Plan. The CSR is prepare4 in accordance with San Joaquin,Cou ty Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines'for investigation of underground storage-tank(UST) sites. .2.0. BACKGROUND 2:1. SITE.LOCATION The facility of CWI is located in a flat commercial/industrial area in the central'paq of Stockton, California. The property, which is situated on the south east corner.of"B" Street and East Charter Way, is occupied by'a main operations building and several smaller utility. sheds. CWI operates a well drilling company on the property. 2.2. UNDERGROUND STORAGE TANK REMOVAL - r" One 500-gallon gasoline UST and one 500-gallon diesel UST were removed from.the site by Falcon Energy Associates (FEA) on.2O March 1991. Water W Drk, Inc. collected one soil sample beneath each UST following the removal. The-samples were anal ed by a.State-certified laboratory for,total - petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d)-and for volatile aromatics.(benzene, toluene, ethyl benzene and xylene: TE&X). ' TPH d was detected at 510 parts per million (ppm) in the sample collected beneath the diesel UST. The sample also contained aromatic hydrocarbons at lowe levels. Soil excavated to facilitate the tank r" rernoval was.placed back into the tank cavity. Analytical results of the soil samples are included in Table 1. . r 2.3. DEPTH TO GROUND WATER According to'ma s Prepared by San Joaquin County Department ofPublic Works Flood Control