IILFR ENVIRONMENTAL MANAGEMENT & CONSULTING ENGJNEERJ~JG 

June 7, 2007 

Mr. Dante Rodriguez, P.E. 

Montrose Project Manager 

United States Environmental Protection Agency, 

Region 9 

75 Hawthorne Street 

San Francisco, California 94105 

SFUND RECORDS CTR 

2277844 

001-0 19 54-04-004 

Subject: Response to United States Environmental Protection Agency, Region 9, May 18, 2007 

Letter Regarding Abandonment of Selected Groundwater Monitoring and Former 

Extraction Wells at the Former Sola Optical U.S.A., Inc. Facility, 1500 Cader Lane, 

Petaluma, California 

Dear Mr. Rodriguez: 

LFR Inc. (LFR) has prepared this letter on behalf of American Optical, Sola (formerly Sola 

Optical U.S.A., Inc.) in response to a letter from the United States Environmental Protection 

Agency (U.S. EPA), Region 9, dated May 18, 2007 ("the Letter") requesting additional 

information regarding the abandonment of groundwater monitoring and former extraction wells at 

the former Sola Optical U.S.A., Inc. facility located at 1500 Cader Lane, Petaluma, California 

("the Site"). 

LFR requested approval from the U.S. EPA to abandon three groundwater monitoring wells (W22, W-25, and LF-2) and three former groundwater extraction wells (E-3, E-5, and E-7) at the Site 

("the Wells") in LFR's report entitled "Groundwater Monitoring and Additional Site Activities 

Report, July through December 2006, Former Sola Optical U.S.A., Inc. Facility, 1500 Cader 

Lane, Petaluma, California," dated February 9, 2007. The U.S. EPA responded to LFR's request 

with the Letter, which requested the following information: 

• updated concentration-versus-time graphs for wells proposed for abandonment 

• a demonstration that applicable relevant appropriate requirements (ARARs) have been attained 

• a map showing the locations of the wells to be retained and those proposed for abandonment, 

as well as an explanation of why the reduced number of wells is appropriate for ongoing 

natural attenuation monitoring 

The following sections of this letter provide the requested information. 

510.652.4500 m 

510.652.2246 f 

1900 Powell Street. 12th Floor www.lfr.com 

Emeryville, California 94608-1814 

Offices Nationwide 
iJLFR 

Concentration-Versus-Time Graphs 

Updated concentration-versus-time graphs for the Wells are attached as Figures I through I2. 

Separate graphs for I, I-dichloroethene (1, 1-DCE) versus time and one for I, 1-dichloroethane (1, IDCA) versus time are provided for each of the six wells, for a total of 12 graphs. The maximum 

contaminant level (MCL) for each chemical compound is shown on each graph as a red line. 

ARARs 

The primary ARARs are federal and State of California drinking water standards (i.e., MCLs), and 

state regulations regarding environmental restrictive covenants. The state MCL for I, I-DCE in 

groundwater is 6 micrograms per liter (p,g/1), and the state and federal MCL for 1, I-DCA is 5 

p,g/1. U.S. EPA guidelines require that the cleanup goals be met and maintained for a minimum 

period of two years following initial attainment (U.S. EPA I994a). Results from semiannual 

groundwater monitoring conducted over the past 20 years, including the past 10 years since the 

groundwater extraction and treatment system was shut down, indicate that concentrations of both 

1, 1-DCE and 1, I-DCA in groundwater at each of the six wells have been below their respective 

MCLs for a minimum of 3 years (range from 3 to I9 years). 

The primary institutional control for the Site is a restrictive covenant, also known as a deed 

restriction. The restrictive covenant adopted for the Site restricts the use of groundwater 

contaminated above the cleanup level. An additional covenant in the form of a note was placed 

with the Sonoma County Permit and Resource Management Department (PRMD), which issues all 

well installation permits for the county. The note states that the parcel that lies directly above 

contaminated groundwater is part of a Superfund site and that well permits should not be issued 

before consulting with the PRMD and the U.S. EPA. Both covenants have subsequently been 

enacted by the U.S. EPA. 

Map and Rationale 

A site map showing the locations of wells proposed for abandonment (red), the well retained for 

monitored natural attenuation (MNA) monitoring (blue), and contingency wells (black) is attached 

as Figure 13. 

According to U.S. EPA guidelines (U.S. EPA 2004b), when MNA is the approved remedial action 

for a site, it is appropriate to remove monitoring wells from the sampling program and abandon 

them once they have reached and remained below the cleanup goal (in this case MCLs) for a 

minimum of two years. The monitoring program for the Site since January 2003 has consisted of 

the following seven monitoring and former extraction wells: W-22, W-25, W-27, LF-2, E-3, E-5, 

and E-7. In accordance with U.S. EPA guidelines, six of these wells have been proposed for 

abandonment and well W-27 has been retained in compliance with the MNA remedy for the Site. 

ltr-response _to_ EPA-Jun07-0!954.doc:lfr 2 
l!il LFR 

The three former extraction wells (E-1, E-2, and E-4) indicated in black on Figure 13 are 

contingency wells associated with the MNA remedy. They can be used for groundwater 

remediation, if necessary, in the unlikely event that the current trends in well W-27 reverse. 

Please note that, since 1999, 51 monitoring and extraction wells at the Site have been abandoned, 

with EPA approval, as they have come into compliance (Figure 14). 

Thank you for your attention to this matter. Please call me at (510) 596-9638 with any questions or 

comments. 

Sincerely, 

Larr puyade 

Senior Project Geologist 

Enclosure: Figures 1 through 14 

cc: Sandy Trocki, Carl Zeiss Vision Inc. 

Roman Starno 

Herbert Levine, U.S. EPA 

References 

U.S. Environmental Protection Agency (U.S. EPA). 2004a. Performance Monitoring of MNA 

Remedies for VOCs in Groundwater. Chapter 4, Section 4.5. April. 

---. 2004b. Performance Monitoring of MNA Remedies for VOCs in Groundwater. 

Chapter 4, Section 4.6. April. 

ltr-response_to _ EPA-Jun07-0!954.doc:lfr 3 
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