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EDMUND G. BROWN JR. <br /> GOVERNOOPP <br /> CALIlOIIMIA <br /> Water Boards SECRETARY FOR <br /> OTE2 <br /> ENVIRONMENT <br /> -P PROTECTION <br /> Central Valley Regional Water Quality Control Board RECEIVED <br /> 28 November 2017 'DEC 0 5 2017 <br /> ENVIIZCNME'v H <br /> pERM1TiSER�CES ITFI <br /> Sharon Evans Chris Panaitescu <br /> Phillips 66 Company Thrifty Oil Company <br /> 1380 San Pablo Avenue 13116 Imperial Highway <br /> Rodeo, CA 94572 Santa Fe Springs, CA 90670 <br /> BP #172 (THRIFTY), 7647 PACIFIC AVENUE, STOCKTON, SAN JOAQUIN COUNTY, <br /> CASE# 390652 <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the Well Installation Report (Report) dated 14 November 2017, submitted on your <br /> behalf by ATC Group Services Inc. (ATC) for the former BP#172 property located at 7647 <br /> Pacific Avenue in Stockton (Site). <br /> In the Report, ATC summarizes the installation of six (6) on-site air-sparge (AS) wells and two <br /> (2) off-site monitoring wells, and the advancement of a soil boring in the vicinity of the former <br /> waste oil underground storage tank (UST). The wells and borings were installed as follows: <br /> Well/Boring Total Depth Screen Interval Groundwater Zone <br /> ftb s <br /> AS-2 60 55-60 Dee <br /> AS-3 60 55-60 Dee <br /> AS-4 60 55-60 Dee <br /> AS-5 80 75-80 Deep <br /> AS-6 80 _ 75-80 Dee <br /> AS-7 80 75-80 Dee <br /> MW-24 80 75-80 Dee <br /> MW-25 40 25-40 Shallow <br /> S B-2 20 -- -- <br /> ft bgs=feet below ground surface <br /> Central Valley Water Board staff has the following comments: <br /> 1. In the Report, ATC recommends developing and surveying the newly installed <br /> monitoring wells during 4th quarter 2017, and sampling the wells during the 4th quarter <br /> 2017 groundwater sampling event. Central Valley Water Board staff concurs with these <br /> recommendations. As other Site wells have been surveyed using the National Geodetic <br /> Vertical Datum of 1929 (NGVD29), please make sure the newly installed wells are <br /> surveyed to the same vertical datum. <br /> KARL E. LONGLEY SOD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 1,020 Sun Center Drive N200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> RECYCLED PAPER <br />