Laserfiche WebLink
•I <br /> 2.6 UST Installation <br /> In May 1994, two 12,000-gallon USTs and associated piping ,%ere installed at the site The <br /> tank installation was performed by Goins Environmental Construction of Saci amento, <br /> California The southern tank is separated into two 5,000-gallon and one 2,000-gallon <br /> sections The tanks were installed in the same excavation from which the former USTs were <br /> removed The stockpiled soil from the UST removal was used to backriill the eastern area <br /> of the tank excavation The location of the new USTs are shoAn on Figure 2 <br /> A conductor casing was installed near the center of the previous tank cluster during the <br /> installation of the new tanks to facilitate the possible drilling and installation of remediation <br /> wells in this area <br /> 30 PROCEDURES <br /> 3,1 Monitoring Well Purge Procedures <br /> GeoAudit recommended discontinuing groundwater sampling from M1V-1 Analytical i esults <br /> from this well have consistently established that groundwater is not impacted in this well <br /> Ms Mai gaietLagotioofthe PHS/EHD%eiballyagieedtoGeoAudit'siecon3mendation, and <br /> only MW-2 and NIW-3 %,.ere san3pled <br /> On December 28, 1994, a Solinst \Nater level meter was used to measure the depth to <br /> groundwater in the three monitoring« ells (Table 1) After water lexels\�,eie nieasuzed, PVC <br /> bailees were used to purge appio\,jmately 9 gallons of water fjom MW-2 and MW-3 <br /> Temperatuie, pH and conductlx3ty \\ere measured at one-gallon intervals using an IC%- 1 <br /> water analyzer The puige water v6 as placed in DOT-approved drums and stoi ed on-site <br /> TABLE 1 <br /> I RELATIVE GROUNDWATER ELEVATIONS <br /> Arco Mini Mart <br /> 4511 Pacific Aienue, Stockton, CA <br /> Relative Depth to Gioundwatet Relative Groundwater <br /> Well Casing Elevation <br /> Elevation 3/94 9/94 12/94 3/94 9/9.1 12/94 <br /> MW-1 9907 4969 5231 5055 4938 4676 4852 <br /> EMW-2 9802 4891 5153 4976 49 11 4649 4826 <br /> MW-3 1 9866 1 4936 5191 5019 4930 4675 48 47 <br /> All aieasuiemens in teel <br /> wApp <br /> ARM QR12! Serves Inc C <br /> W!�f 0 1 i •7 <br />