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' ENVIRONMENTAL, HEALTH'DEPARTMENT
<br /> SAN. JO.A,QUIN COUNTY
<br /> Donna K.tIeran,12.E.H.S. Unit Supervisors
<br /> U):
<br /> Director 304 Fast Weber Avenue, Third Floor Carl"so,gn;an,R.E.il.5,
<br /> Mike Huggins,R.E.H.S.,R.D.I.
<br /> " A!Olsen,R.E.N.s. Stockton, Califomia 95202.2708 i
<br /> �'••' —.P Pry rata Managed. Douglas W,Wilson,R.E.1l:S,
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<br /> A. Teicphohe: (209.)468-3420 Margaret Labnrio,R:Gx :S.
<br /> Pr-ogrm�i herrnctber- Fax: (209) 464-013 Laurie A.Cot+]lan R.r.ii:5. Robert McClellon,R.E.H.S.
<br /> Mark Barcellos;R.E.H.S:
<br />' MIRE STRONG MAR 11 20D
<br /> RUTH STRONG PROPERTY
<br /> 330 E HOLLYWOOD
<br />' TRACY CA 95376
<br /> P BIC
<br /> 2 i
<br /> RE: RUl'H STRONG PROPERTY f
<br /> I 5157 W BUSINESS LOOP 205 MAR I.
<br /> TRACY CA 95376
<br /> Four groundwater monitoring wells, MW8,MW9,NfWl 1,and M%V12, have been installed in the
<br /> do pgradient direction (fluctuating between northeast to northwest) of the"three wells NnI '2,MW5,
<br /> and MIN,'6 to define the lateral extent of the groundwater.contamination. San Joaquin County
<br /> Environmental Health Department (I-FID) has reviewed Third_Qwarter 2004".�irrrter�y Reporl(the
<br /> report) dated December 23,2004 prepared by Advanced GeoFnvironmentai, Inc. (AGE), and a fax
<br /> copy of the analytical results of the groundxvatcr samples for 4t4 quarter-2004.. Analytical results of j
<br /> the water samples from all 4 downgradicnt wells,hl[V$,Nf\V9,N V11, and TM '12 were.non-detect "
<br />� . for all contaminants the last four tluartcrs.
<br /> In a telephone conversation with AGE on March 9, 2005, EHD agreed that the extent of the
<br /> contamination at the above-referenced site has been defined. Submit a Problem Assessment Report
<br /> I (PAR) to EHD by April 30,2005. The PAR should include a site conceptual model which describes
<br /> the lateral and vertical extent of the contaaunation,identification of at least two remedial alternatives,
<br /> and a proposal for investigating the remedial alternatives so the most cost-effective alternative to
<br /> clean up the site can be evaluated.
<br /> I
<br /> During the telephone conversation mentioned above,AGF. s'ugge'sted soil vapor extraction and.air i
<br /> sparge as one of the technologies to be evaluated.in the PAR. Accordi ng to the well logs of MW2,
<br /> 1v1%V5,and,N1X/6,a clay to silty clay layer begins:between 10.feet to 15 feet belowsurface grade (bsg)
<br /> and the average depth to groundwater"V5)is at about 13 feet bsg over the last 5 years. Due to
<br /> the presence of clay soil;lack of a vadose zone,arid low concentration of aromatic,hydrocarbons in
<br /> the groundwater,soil vapor extraction and air sp-,urging are unlikely to work. EHD recommends
<br /> evaluating soil removal as one the potential remediatibn alternatives. Analytical results of the soil
<br /> samples from MW6 taken"at 15 feet bsg in May 2000 were 330 n-&grams per kilogram (rng/kg) of
<br /> 'Total Petroleum Hydrocarbon as diesel('TPH-d) and.140 ing/kg of TTH-gasoline(TPH-g). Results
<br /> I of the soil-samples taken from MW2 at 15 feet bsgwere 380 mg/kg of'I'PH-g and 3.9 mg/l g of
<br /> Benzene. Removal of contanunation source in the soil may reduce the contamination concentration
<br /> in groundwater,and bring the'site toward'closure status in.a tiEnelier basis. If you have any
<br /> questions;please direct them to Jeff Wong at(209)468-0335.
<br /> Donna Heran;RENS,Director
<br /> Environmental Health;Dii>ision
<br /> Jeffrey Wong, R>~H5 Margaret ago,o,REAS
<br /> LOP/Site Mitigation Unit I-' Supervisor
<br /> Ic; Advanced G'eoEnvironmental Inc.-Brian Millman
<br /> c: RIVQCB;Central Valley Region-James L.L. Barton,RG
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