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Trihyd o �w :�m. T 5 Mr.August hem Breach Mr. W[ om Bre0 25, 3 Papal M August 25, 2020 APSV-9/I0 is a nested soil-vapormonfroring well that was installed on July 15, 2005, as reported in Soil for We /We ns�dSo1J raporEvitac ton art-Up Report prepared by SECOR International Incorporated (SECOR) on November 30. 2005. The original purpose of the well was to provide in. Water Resource Control Mr. William oat P.E. information an baseline conditions for comparison against future monitoring of the horizontal soil vapor ol Engineer extraction (SVE) systems mingled beneath the undeveloped portion of the L&M OU. The well was Private Sites Cleanup Unit installed to a total depth of fret (ft) with one 8-inch soil Ceatmi Valley Regional Water Quality Control Board gas probe screened from ft bgs to5ftbgs 11020 San Center Drive #200 (APSV-10), and one 8-inch soil gas probe screened from 8,3 ft below ground surface ee (bgs) to 9 ft bgs Rancho Cordova, CA 95670 (APSV-9). This well was installed in collect soil gas samples from multiple depth intervals so that differences in soil vapor concentrations could be Compared vertically. The well is c mently sampled on a RE: Work Plan for Soil Vapor Well APSV-9/10 Replacement semis nual basis in accordance with the Central Valley Regional Water Quality Control Board L&M Operable Unit (CVRWQCB) approved Request for Revision to Soil Vapor Monitoring Report submitted by Trihydro on Case #SL0002050099 August 29. 2017. 666 West Weber Avenue During the Fall 2019 sampling event the APSV-9/10 well manhole was observed as damaged and die Stockton, San Joaquin Cowry well vault contained standing water, odorous soil, and stripped bolt holes. The surrounding Concrete apron had multiple cracks and breaks. The damages sustai mtT watched by repetitive vehicular tc and standing Dear Mu. Burstein: water appear to have left the well in a compromised condition. Trihydro Corporation (Trihydro), on behalf of Chevron Environmental Management Corporation (CEMC) and Phillips 66 (P66), has prepared this work plan to replace soil vapor monitoring location SCOPE OF WORK APSV-9110 at the Delta View Apartments (Delta View), adjacent to the L&M Operable Unit (L&M OU; The purpose of the proposed work is to replace the soil vapor monitoring well APSV-9/10 with another Site), located near the Comer of North Lincoln Avenue and West Weber Avenue in Stockton, California. well of similar construction in a nearby area (away from the low point in the center of the roadway). The The Site location is shown in Figure 1, and a Site map is included as Figure 2. The well is located in the p ject scope will consist of the following actions: middle ofle apanmrnt's main access roadway and was observed to have a broken well vault lid and IObtain permits for well installation/abandonment from the San Joaquin County Department of manhole cover and Cracking of the c incmte pad sunout111ing the vault during the Fall 2019 soil vapor Environmental Health, sampling event new damages provide a potential pathway for surface water and contaminants to enter Review the access agreement with Delta View Apartments and notify the Delta View Apartments the well, potentially impacting the integrity of the soil vapor samples collected from this location. This Work Plan details the proposed replacement activities of APSV-9/10. management staff of the anticipated construction schedule as to not inter£ with operations and [events. BACKGROUND • Mark the site using white paint and notify Underground Service Alert (USA) by submitting a dig A portion of the Site is Currently owned by the City of Stockton, which ref to the Site and surrounding rocket. Public utility owners will be contacted to identify any lines present within the proposed work nics as 'Paree12A". The Site currently consists of relatively flat fallow Ind and is mostly undeveloped area and drilling locations will be modified to remain outside of utility tolerance zones. except for the Delta View Aparenents (Buildings 1 through 5) located on the western and southern • Perform a private utility locate survey around the proposed drilling location to identify subsurface portion ofle Site. A State Department of Motor Vehicles (DMV) building is located to the southeast of utilities, structures, or obstructions that would othmvlse present a hazard. Me Site The Stockton Deep Water Channel (McLeod Lake), Tulebmg Levee, Weber Avenue, and an ft Procure a licensed &57 drilling Contractor to remove one nested soil vapor monitoring well office building Complex are located north of the Site. The Mormon Slough nuns northwest to southeast of (APSV-9/IO), including Concrete pad and well vault and replace with a new soil vapor monitoring the Site from the Stockton Deep Water Channel. The Work Net building is southeast of the Site across well V similar construction on at [nearby location using acompressedlawith air knife rig. North Lincoln Street and there is a children's museum several 100 yards east of the Site across North Lincoln Street on the south side of West Weber Avenue. d Concord Office 1 2520 cols me Drive, Suite IOS I Career . CA 945201 shape 9251270.4674 1 Iry D25127D.4e8s p � Home orrice 1 1252 commerce Drive l Laramie. tar 82070 1 phone 3071745.t474 I fax 307174s.7729 •ee3rlhrara.com \