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71�- � <br /> ..�. �.-� VIRONMENrT AE EA� <br /> EN N JOAQUIN `COUNTY <br /> Unit5upervisors I <br /> o u k SA Carl Borgman,R.E,H.S. <br /> Third Floor <br /> Mike Hugg <br /> Donna K.Reran,R-E.H.S- 304 East Weber Avenue, pouglas WnSWRson,R:E.H Si l <br /> Q: =1 Director StOCtCCOri, California g$202-2708 Margaret Lagorio,R.E.H.S. <br /> Al Olsen,R.E.H.S. ' <br /> _ 468-3420 <br /> P.� Program Manager Tetepbone: (200,3 Robert McClellon,R.E.H.S. <br /> cQ�iFORc'\ Laurie A.Cotuua,R.E.H.S. Fax: (209) 464-01.38 Mark Barcellos,.R.E.H.S. <br /> Program Manager <br /> OCT 1 b 2uu3 <br /> MARTIN HARRIS <br /> 5151 ALMONDWOOD DRIVE �I <br /> MANTECA CA 95337 <br /> RE: Tuff Boy Trailers SITE CODE: 1424 <br /> 5151 Almondwood Drive <br /> Manteca CA 95337 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed "Work <br /> Plan forAdditional Investigation" (Work Pian) dated 06tobe(3, 2003 that was submitted <br /> on your behalf by Ground Zero Analysis Inc. (Ground Zero) and has the following <br /> comments. <br /> The Work Plan proposes the installation of three shallow, groundwater monitoring wells <br /> for lateral investigation of the site, and one deep soil boring for vertical investigation of <br /> the site. One shallow well will be installed in the former tank 1pit area, utilizing a limited <br /> access drill rig. The other two shallow wells will be installed approximately west and <br /> northwest of MW-2. The deep boring will be installed rear well MW-1, to a total depth of <br /> 75 feet below surface grade (bsg), utilizing direct push;technology. Cone penetrometor <br /> testing (CPT)will be used to obtain lithology information from 25-75 feet bsg. This <br /> information will be used to target possible water bearing units for the collection of depth <br /> discrete groundwater samples. Groundwater samples; will be analyzed for total <br /> petroleum hydrocarbons as gasoline by EPA Method 801513;,benzene, toluene, <br /> ethylbenzene and xylenes by EPA Method 8021 B, and'fuel oxygenate additives, <br /> 1 ethylene dibromide and 1,2-dichloroethane by EPA Method 825013. Should the <br /> analytical results from these samples report contamination, deep discretely screened <br /> monitoring wells will be installed. This work is approve0 as outlined. <br /> Information was submitted to supplement the original well survey. The total depths and <br /> construction details of the onsite production well and the closest domestic well are still <br /> unknown. Ground Zero reported that this information is still being researched. If the <br /> total depths cannot be determined, Ground Zero proposes to perform an evaluation of <br /> the influence these wells may have on the contaminant plume by monitoring the <br /> groundwater elevations in the onsite monitoring wells while pumping from each well <br /> individually over a period of time. Without well construction details and a driller's log, <br /> this test may be useful if properly designed. The onsite monitoring wells should certainly <br /> ji be a part of the test, but a deep well in a sentinel position, screened in an interval <br /> thought to be a potential contaminant migration pathway would be needed to get data on <br /> the response of groundwater at or just below the base"of the.jplume. The site <br /> hydrogeology at the base of the plume should be well characterized. <br /> f <br /> ;r ;I <br />