SITE INFORMATION AND CORRESPONDENCE FILE 1

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ENVIRONMENTAL HEALTH DEPARTMENT Pau ` " SAN JOAQUIN COUNTY 2: y Donna K. Heron, R.E.H.S. Unit Supervisors y � Director 304 East Weber Avenue, Third Floor Cad Borgman, R E x s Laurie A. Cotulla, R.E.H.S, Stockton, California 95202-2708 Mike Huggins , R.E.H.S . , R D.I. � . , _�_- e • Progrmn Manager Douglas W. Wilson , R.E. H .S. 9C� FOR�` Telephone : (209) 468-3420 Margaret Lagorin, R .E.H.S . Fax : (209) 464-0138 Robert McClellon , R.E.H.S . Website: wwwsjgov.oi-g/ehd/ Jeff Carruesco, R.E.H.S . JAN 2 3 206 ROGER HUCKINS FERNANDO HATCHER 3436 ADMIRAL DRIVE 1201 S CENTER ST STOCKTON CA 95209 STOCKTON CA 95206 p `1 RE : Fernando' s Place Site Code : 505309 1201 S . Center St. (APN : 14716003) ROM 0233 Stockton , CA 95206 SWRCB-CUF#: 012186 San Joaquin County Environmental Health Department (EHD) has reviewed Additional Subsurface Investigation and Interim Remediation Work Plan (Plan) submitted by your consultant, Advanced GeoEnviron mental (AGE) on December 28 , 2005 and has the following comments . In correspondence dated July 21 , 20057 EHD directed you to submit a work plan to continue the site assessment (plume definition) by September 1 , 2005 . EHD had concurred with AGE's conclusion that the petroleum hydrocarbon impacted ground water was not laterally or vertically defined and required additional investigation . The Plan submitted proposes installing three offsite continuous multi-channel tubing (CMT) polyethylene cased monitoring wells to a total depth of 198 feet below ground surface (' bgs). These CMT wells will be constructed with five (5) screened sections for sampling the ground water from previously identified hydrological units (HU ). Additionally, the Plan proposes installation of two 4-inch PVC-cased extraction wells onsite, one at each of the two former UST locations for ground water extraction (GWE ) . Pump tests on these extraction wells to evaluate the feasibility of using GWE to control the plume migration offsite and reduce the dissolved petroleum plume concentrations were also proposed in the Plan . Although EHD appreciates your intention to start cleaning up your site , EHD is concerned that your proposal to conduct an offsite vertical extent investigation of the dissolved petroleum plume before the onsite vertical extent of the plume has been delineated may not be the most cost-effective way to proceed . By placing CMT wells offsite that do not include potentially impacted HUs at depths greater than the currently known depths of the onsite plume , EHD feels that this offsite vertical investigation may not be adequate for addressing the vertical investigative requirement. Once the vertical extent of the petroleum plume has been defined onsite , the lateral extent of the impacted HU at all depths of concern could be more cost-effectively investigated and the use of the CMT wells can be optimized by including deeper HUs , if applicable .