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0 1:00 <br />Water Boards <br />EDMUND G. BROWN JR. <br />DC VIA Nan <br />..,ATTNEW RODRIOUEZ <br />FOA <br />NNOIONMDrii.M. PUOTECNON <br />Central Valley Regional Water Quality Control Board <br />12 March 2018 <br />Min Le <br />McBillin Real Estate Investment <br />3293 Napa Drive <br />San Jose, CA 95148 <br />McBILLIN REAL ESTATE INVESTMENT, 2154 S. EL DORADO STREET, STOCKTON, SAN <br />JOAQUIN COUNTY, CASE# 391184 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the Monitoring Well Installation Report (Report) dated 31 January 2018, submitted on <br />your behalf by Advanced GeoEnvironmental Inc. (AGE) for the McBillin Real Estate Investment <br />property at 2154 S. El Dorado Street in Stockton (Site). Well construction and sampling <br />information is summarized in the table below. <br />Well Total <br />Depth <br />(ft bgs) <br />Screened <br />Interval <br />(ft bgs) <br />TPHg <br />(ug/L) <br />TPHg <br />(ug/L) <br />B <br />(ug/L) <br />T <br />(ug/L) <br />E <br />(ug/L) <br />X <br />(ug/L) <br />MTBE <br />(ug/L) <br />TBA <br />(ug/L) <br />MW-12 125 110-125 9,130 <500 2,370 <100 <100 <300 <300 <5000 <br />MW-13 40 20-40 <50 <500 <1 <1 <1 <3 <3 <50 <br />TPHg=tota petroleum hydrocarbons as gasoline; TPHd=TPH as diesel; BTEX=benzene, toluene, ethylbenzene, xylenes; <br />MTBE=methyl tert butyl ether; TBA=tert butyl alcohol; ft bgs=feet below ground surface; ug/L=micrograms per liter. <br />In the Report, AGE concludes that shallow hydrocarbon impact to groundwater is defined and <br />that additional efforts are needed to define the deeper component of groundwater impact east of <br />the Site. Central Valley Water Board staff concurs with AGE's conclusion. <br />In the Site Assessment Monitoring Well Installation Work Plan Addendum — October 2016 dated <br />25 October 2016, AGE proposed the installation of off-site wells MW-11 through MW-13, and <br />off-site borings B-14 through B-17. In a 7 November 2016 letter (attached) Central Valley Water <br />Board staff concurred with these proposals and also requested that AGE advance two additional <br />borings (B-18 and B-19). Central Valley Water Board staff, State Water Resources Control <br />Board staff, and Mr. Tim Cuellar of AGE in July 2017, agreed in email correspondences that the <br />proposed and requested off-site borings would be postponed until after AGE installed wells MW- <br />11, MW-12, and MW-13, and advanced only if necessitated by the groundwater results from <br />these wells. Proposed well MW-11 was not installed along with MW-12 and MW-13 due to City <br />encroachment permit restrictions and the presence of overhead and underground utilities. Due <br />to the elevated hydrocarbon concentrations in deep well MW-12, Central Valley Water Board <br />staff requests that you install/advance well MW-11 and borings B-14 through B-19, and has the <br />following comments: <br />1. Due to permitting and utility complications in the previously proposed location, Central <br />Valley Water Board staff request that you install well MW-11 near existing shallow well <br />KARL E. LONOLEY ScD, P.E.. CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTWE Or,FiCER <br />11020 Sun Center Orive 9200, Rancho Cordova, CA 95870 I www.yraterboards.ca .govicentralvalloy <br />necvct.ro rArEn