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San Joaquin County -.Y!N Environmental Health Department BOaECRW 600 East Main Street DOMM HMWR'REHs Stockton, California 95202-3029 PROGNUMCCOMMYORS R&MM MQEMM,ffaDfZ FMI Wobsft--www-sj9ov-or~ Ka%-y Fdke!x REHS Phone: (M)466-3428 Unla Tom„REHS Fax: (209)464-0138 November 7,2011 Mr-Allan Fathers Ripon Farm Service In rated 3660 Affawhead Court Stockton, CaUkaga 95219 Subject: Ripon Farm Service Incorporated 932 East Frontage Road,South Highway 99(Forrneirly 22871 South Highway 99) Ripon,California 95366 Dear W Fetkas- The San Joaquin County Environmentadl Headh Department (EHD) has received a Ab Fwffier Achm Reqwred Concunence Ilei fror the Central Va9ey Regibnal Water Qual.W Contra Board (CVRWQCB), dated 01 November 2011, for the above referenced srfte- it is now necessary to plan and execute the destruction dF all wets instafled as W dF your sine invesbgafm and remedial ackm, as t* EHD mii1:0 not issue a Case Ck)sum Letter for ftas sde unN the wells have been pTqpedy destroyed and al amsite waste maWdl has been raiwioved and properly disposed. The wells are to be destroyed wftn 90 days of Me date of this letter,or cuffent analytical data for groundwater cdlllecfted quadedy fiDrn the wellls shall be submiLled fbr review ungO the wells haw been propeAy destroyed. The EHD has received Ike Wm1k FUn (Work plan), dated 26 July 2011. submMad by your consulting firm,A&anmd GeoEnvrironmenlal, Inr- (AGE),for Ve destruction of 24 wells associated with your site.. In the work plan, AGE proposes to check each %%efl for obstructions and W found, remove the obstructions prior to destroying the well, AGE proposes to drill out and remove the materials used le carysbW umparded n*n4onrq ells MW-4, 11 9 and WW-140, and vapor wefl VW 1, then backfill the boreholes to surface grade with neat cement- In addton to the three monilonng we1s and one vapor we0l, the EHD domcks that the Ternaining 20 weDs (MW-1 through MW-3, MW-5. [AS-1 through RAS4, VW-2, VW-3A, VW-aB, VW-4 thnxqh VW-8, 1W-9A, VW 9B, VW-10 and VW-11) ato be destroyed by dfilfing out and removing the well contents since soil data avaii1able for mcs# of these wets and confirmation soil samples collected in 2003, indicate the presence of residual pebdeum hydrocarbon contamination, AGE proposes to over-chill the impacted weft using eight-inch or ten4nch d4arneter hoqkrv- stem augers- The EHD approves the use of eight- or ten-inch augers to over-drill all wells except vapor wells 141t1P'-1 and VW-2- These two welts have two nested casings in each borehole that were oronally installed using lenAnch augers. The EHD directs that fifteen4rch augers, centered on the deeper of the two nested casings, be used to destroy 1dW-1 and