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1 � 1'.1„d,y OIMA IVWM�f MlOY <br /> C/......Ml♦ �/% NAC H°IMYIMNI[lo <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board <br /> 22 April 2019 <br /> Andrea Wing Nancy Sanguinetti Franzia, Trustee <br /> Equilon Enterprises LLC Nancy Sanguinetti Franzia Trust <br /> 20945 S. Wilmington Ave 8465 E. Lathrop Rd <br /> Carson 90810 Manteca, CA 95336 <br /> WORK PLAN RESPONSE, SANGUINETTI PROPERTY, 2086 S. MARIPOSA ROAD, <br /> STOCKTON, SAN JOAQUIN COUNTY, CASE#392007 <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed the Site Assessment Work Plan(Work Plan) dated 18 April 2019, submitted on your <br /> behalf by Wayne Perry Inc. (WPI)for the Sanguinetti Property unauthorized petroleum release <br /> at 2085 E. Mariposa Road in Stockton (Site). <br /> In the Work Plan, WPI proposes to advance three cone penetration test borings (CPT-1 through <br /> CPT-3) in the vicinity of previous boring B4, as summarized below. <br /> Location Total Soil Sampling Groundwater Sampling <br /> CPT <br /> Boring Relative Depth Depth Analysis Depth Analysis <br /> to B4 <br /> ftb s ftb s ftb s <br /> 1 Z25ft SE 5ft intervals TPHg,TPHd, BTEX, TPHg, TPHd, BTEX, <br /> 2 -25ft W 50 from 5ft to fuel oxygenates 45-50 fuel oxygenates <br /> 3 -25ft N Total De th <br /> TPHg=total petroleum hydrocarbons as gasoline;TPHd=TPH as diesel;BTEX=benzene,toluene,ethylbenzene,xylenes; <br /> ft=feet;bgs=below ground surface <br /> As all soil samples collected from previous borings B1, B2, B3, and B5 were near or below <br /> reporting limits for all analyzed petroleum constituents, the proposed locations around B4 is <br /> appropriate. Additionally, the proposed depths of soil and groundwater sampling appear <br /> appropriate for lateral and vertical delineation of impact to soil and for initial groundwater <br /> assessment. As such, Central Valley Water Board staff concurs with the scope of work as <br /> proposed. However, the proposed total depth of 50 feet is based on recent depth to <br /> groundwater data from the neighboring USA#110 case. In the event that Site groundwater is <br /> deeper than anticipated, each boring should be advanced until groundwater is encountered and <br /> can be sampled. <br /> By 26 July 2019, please submit a Site Assessment Report which details the completion of the <br /> above discussed scope of work and the resultant findings. In the Report, please also identify <br /> any remaining data gaps in relation to the State Water Resources Control Board's Low Threat <br /> Underground Storage Tank Case Closure Policy(LTCP), and provide recommendations for a <br /> scope of work to address any identified gaps. <br /> Wmr E. LDNOEEv Scl),P.E.,CHAIR I PATRICK PU UPA,E60.,EXECUTIVE OEFICER <br /> 11020 Sao Cent.,DIN.4200,Rancho Cordova,CA 95520 1 www.walerhoards.ca.govtcentlalvalley <br /> `+N C,,tia I'MIM1 <br />