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t Y E D SEP 0 3. 200 <br /> ENV RQN�&NTAL HEALTH �PARTMENT <br /> PQurN <br /> 5° o SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.&H.S. Unit Supervisors <br /> `: DFrcrtos 304 East WeberAvenue,Third Floot Carl Borgman,€ ,RH.S. <br /> Al Olsen, R.F.H.S. Stockton,California 95262-270$ Mike Huggins, R.8,HS, R.D.I. <br /> Doa las W.Wilson,tt R.H.S. <br /> Program Manager Telephone:(209)468-:3420 <br /> �c POMargaret Lagorio,R.C.H.S. <br /> L"aerie A. Cotulla, St.I .II.S. Fax: (209)464-0138 Rbbert McClellon, R,E.H:S. <br /> Program Manager Leff Carl�te5ca, R,$.'H.S. <br /> Website.Ww.sjgov.0rj/ehd/ <br /> I� <br /> DOUG STIDHAM XULJIT MANGATJG .1 ; OO <br /> CITY OF ESCAL'ON 622 CLAY WAY <br /> PO BOX 248 RIPON: CA 95336 <br /> ESCALON CA 95320 <br /> i <br /> `k <br /> RE: South County Fond & Fuel SITE C_ ODE: 14.87 <br /> 1305 Escalon Avenue <br /> Escalon CA 95320 <br /> San Joaquin County Environmental Health Department(SJClEHD.) has reviewed Work <br /> Plan— Well Abandonment dated August 11, 2005, prepared and submitted on your behalf <br /> by Geological Technics inc. (GTI) and has the following comments. <br /> f <br /> The work plan proposes the destruction by pressure grouting of six groundwater <br /> monitoring wells and four soil vapor extraction.wells. <br /> ,4 <br /> San Joaquin County well standards require wells destroyedIby pressure grouting to be <br /> surface completed by excavation of a hole at least one-foot jlarger in diameter than the <br /> original borehole around the well casing,to.a depth of three Ifeet below surface grade. <br /> The well casing shall then be cut six-inches above the bottom of the excavation. After the <br /> well casing has been properly filled with grout'and pressurized, the cement grout will be <br /> allowed to pour over the top of the cut casing to form a mus hroDm cap at least one-foot <br /> think in the excavation. Monitoring wells MW-1, MSA!-2, MW 4, Mall-5 and MW-101, and <br /> vapor wells VEW-3 and VEW-4 shall be completed in the above described manor. i <br /> if <br /> Vapor wells VEW-1 and VEW-2 were located near the eastern edge of the site; these <br /> wells were subsequently covered with the sidewalk and/or part of Escalon Avenue. Prior <br /> to completion of the road construction these wells were connected to underground <br /> conveyance piping laid in a 4-foot deep trench that ended iri.a common vault near VEW-3 <br /> and VEWA in the center of the site. VEW-1 has a total depth of 55 feet below surface <br /> grade (bsg), VEW-2 has total depth of 27 feet bsg. GTI has;proposed destruction of these <br /> well by pumping grout to total depth of each well through 1-inch diameter poly tubing, I <br /> followed by pressurization. SJC/EHD approves this method with the condition that GTI i <br /> verifies that the appropriatelength of tubing is installed in each well to ensure the grout j <br /> reaches the bottom of the well, and that an appropriate minimum quantity of grout is used <br /> in the destruction. The horizontal piping may have to be cuts back from the vault area to ' <br /> ensure proper surface completion of VEW-3�and VEW-4. f <br /> r <br /> Monitoring well MW-3 is located in a narrow curb median In!the middle of Escalon Ave. <br /> This well can be destroyed per the procedure proposed in tli'e worm plan. <br /> i l <br /> �l l <br /> .i <br />